南京拓品微电子有限公司

TP5100
NanJing Top Power ASIC Corp.

南京拓品微电子有限公司
NanJing Top Power ASIC Corp.

TP5100
2A Switching Buck Charger IC for
8.4V/4.2V Lithium-Ion Battery

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

Description
TP5100 is a switching-buck type (double 8.4V / single 4.2V) lithium battery
charging management chip. Its QFN16 ultra-compact packaging and simple
peripheral circuit make TP5100 ideal for portable devices with large current
charging management applications. Meanwhile, TP5100 has built-in input
overcurrent protection, undervoltage protection, over temperature protection,
short circuit protection, battery temperature monitoring, and reversing battery
protection.
TP5100 has a wide range of input voltage, from 5V to 12V. The charging
process includes three stages: trickle pre-charge, constant current, constant
voltage. Trickle pre-charge current and constant current can be adjusted
through an external resistor, with maximum charging current up to 2A. TP5100,
with a switching operation mode of frequency of 400 kHz, uses smaller
peripheral components, and produces less heat while in charging operation
with large current. TP5100 has built-in power PMOSFET, anti-intrusion circuit,
so there is no need to have external anti-intrusion protection with Schottky
diode.

Characteristic
■ Double / single 8.4V/4.2V rechargeable lithium battery
■ Built-in power MOSFET, switching operation mode, less heat, simple
peripheral
■ Programmable charging current, 0.1A--2A

■ Programmable pre-charge current, 20% - 100%

■ No need of external Schottky diode for anti-intrusion

■ Wide operating voltage up to 12V

■ Red and green LED charging status indicator

■Chip temperature protection, overcurrent protection, undervoltage protection

■ Battery temperature protection, reverse battery shutdown, short circuit

protection
■ Switching frequency: 400KHz, available inductance: 4.7uH-22uH

■ PWR_ON-power, battery charging switching control

■ Less than 1% of charging voltage control precision

■ Trickle, constant current, constant voltage charging stages to protect battery

■ using QFN16 4mm * 4mm ultra-small packaging

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

Absolute Maximum Ratings

■ Static input voltage supply (VIN): 18V
■ BAT: 10V
■ BAT Short Duration: Continuous
■ The maximum junction temperature: 120℃
■ Operating ambient temperature range: -40℃ ~ 85℃
■ Storage temperature range: -65℃ ~ 125℃
■ Lead Temperature (Soldering, 10 sec): 260℃

Application
■ portable devices, various chargers
■ smart phones, PDAs, mobile cellular phone
■ MP4, MP5 players, Tablet PC
■ HM
■ Power Tools
■ PTT

Typical applications
VIN=12V
0.2Ω（0.4 ohm parallel connection is
recommended，1206 Encapsulation）

1. 4. 5. 16 10uH
1K 2. 3 VS BAT+
10uF 0.1uF 13 VIN LX
CS Rs=0.067
3Ω
SS34

6
PWR_ON-
0.1nF 8.4V
10uF
10uF

0.1uF

TP5100 2SLi
0.1uF

8
VS
G R 15
CHRG
14 9
STDBY BAT
RNTC
R2

10
VREG
12 11
RTRICK TS
50K

0.1uF GND
R1

Figure 1 TP5100 double 8.4V-1.5A rechargeable lithium-ion battery (150MA prefilled)

Application Diagram

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

VIN=5-12V
0.2Ω（0.4 ohm parallel connection is
recommended，1206 Encapsulation）

1. 4. 5. 16 10uH
1K 2. 3 VS BAT+
10uF 0.1uF 13 VIN LX
CS Rs=0.067
3Ω

SS34
6
PWR_ON-
0.1nF

10uF
10uF
4.2V Li

0.1uF
TP5100

0.1uF
8
VS
G R 15
CHRG
14 9
STDBY BAT

RNTC
R2
10
VREG
12 11
RTRICK TS
50K

0.1uF GND

R1
7

Figure 2 TP5100 single 4.2V-1.5A rechargeable lithium-ion battery (150MA prefilled) Application
Diagram

Package / Ordering Information

Orders Model

TP5100-QFN16

Device Marking

TP5100

Physical picture

16-pin 4mm * 4mm QFN 16 package top view

(Heat sink grounding can not be connected to
other potential)

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

TP5100 functional block diagram

Figure 3 TP5100 Functional Block Diagram

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

Electrical characteristics
Table 1 TP5100 electrical characteristics of energy parameters
Where Note ● denotes the specifications 8.4V, 4.2V mode, otherwise refers
only 8.4V, TRAR = 25 ℃, VIN = 9V, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Unit
VIN Input supply voltage 4.5 12 V
No battery mode ， μA
RS=0.1Ω,Standby mode 150 180 μA
（ Charge termination ） 120 140 μA
ICC Input supply current
Shutdown mode 120 140
（CS=GND，Vin<VBAT， 120 140
or Vin<VUV）
4.2V Lithium ion battery 4.158 4.2 4.242 V
VFLOAL Charge cut-off voltage
8.4V Lithium ion battery 8.316 8.4 8.484 V
RS=0.1Ω，Constant current
BAT Pin Current: 850 1000 1150 mA
mode, Rs=67mΩ，Constant
(Current Mode test 1300 1500 1700 mA
IBAT current mode, Standby
conditions are CS = 0 －1 －1 uA
Mode ， VBAT=8.4V,
VREG, battery = 7.5V) 0 －1 －1 uA
VIN=0V ， VBAT=8.4V
Trickle pre-charge
1.2V<VBAT<VTRIKL ，
ITRIKL current RTRICK Pin to 240 300 360 mA
RS=0.067
50k Resistance
F Oscillation frequency 350 400 500 KHz
DMAX Maximum Duty Cycle 100%
DMIN Minimum duty cycle 0%
Trickle Charge
Threshold Voltage
（8.4V） 5.6 5.8 6.0
VTRIKL RS=1Ω，VBAT Rise V
Trickle Charge 2.8 2.9 3.0
Threshold Voltage
（4.2V）
Hysteresis voltage
VTRHYS RS=1Ω 60 80 100 mV
trickle charging
VIN Undervoltage
VUV VIN From low to high 3.5 3.6 3.8 V
lockout threshold
VIN Undervoltage
VUVHYS 150 200 300 mV
lockout threshold
VIN-VBAT Lockout VIN From low to high 60 100 140 mV
VASD
threshold voltage VIN From high to low 5 30 50 mV
CHRG Pin output low ICHRG
VCHRG 0.3 0.6 V
voltage =5mA
STDBY Pin output low ISTDBY
VSTDBY 0.3 0.6 V
voltage =5mA
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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

%*
TEMP Pin high-end
VTEMP-H >80 82 VR
shutdown voltage
EG
%*
TEMP Pin low-end
VTEMP-L 43 <45 VR
shutdown voltage
EG
Δ Rechargeable battery
VFLOAT-VRECHRG 80 150 200 mV
VRECHRG threshold voltage
Chip protection
TLIM 110 ℃
temperature
Power FET
RON 170 mΩ
on-resistance
tss Soft-start time IRBATR=0 to IBAT=0.1V/Rs 20 uS
Recharge Comparator
tRECHARGE VBAT High to Low 0.8 1.8 4 mS
Filter Time
Termination
tTERM IBAT Below C/10 0.8 1.8 4 mS
Comparator Filter Time

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

Typical performance indicators (CS set to 8.4V lithium

battery charging mode)

8.430 8.430
TA=25℃ VCC=9V
VCC=9V
TA=25℃
8.420 Rs=0.1 8.420 Rs=0.1
Rs=0.06

8.410 8.410 1500

VFLOAT(V)

VPROG(V)

IBAT(mA)
8.400 8.400

8.390 8.390 750

8.380 8.380
短路
模式
8.370 8.370 0
9 10 11 12 13 14 15 -50 -25 0 25 50 75 100 0 2.0 6.6 7.2 7.8 8.4 9.0
VCC(V) TEMPERATURE(℃) VBAT(V)

Figure 4 Figure 5 Figure 6

100%
90%
80%
η
70%
60%
TA=25
Rs=0.1
50% L=10uH

40%
9 10 11 12 13 14 15
VCC(V)

Figure 7
Figure 4 : Relationship between battery cut-off voltage and supply voltage
Figure 5 : Relationship between cut-off voltage and ambient temperature
Figure 6 : Relationship between charging current and battery voltage
Figure 7 : Relationship between efficiency and supply voltage

difference between VIN and

Pin Function VRBATR is less than 30mv,
VIN（PIN 1、4、5、16）：the positive TP5100 enters shutdown mode,
input voltage terminal. Voltage allowing IRBATR drops to 1μA.
across this pin is the power supply LX（PIN 2、3）：Built-PMOSFET
of the internal circuit, VIN varies power pipe drain connection. LX
between 5V to 12V with 10uF and is TP5100’s current output terminal,
0.1uF bypass capacitors ， and it is connected to the external
Dissipative resistance connected in inductor as the input for battery’s
series with 0.2 ohm. When voltage charging current.

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

PWR_ON-(PIN6):Power of pre-set constant current, through

switching control pin. When the an external resistor. If RTRICK is
chip is connected to the power floating then pre-charge current is
supply, PWR_ON-internal switch is set to the constant current.
pulled low, and PMOS is on; when CS (Pin13): Lithium ion status
the chip is not connected to the selection input terminal. CS pin
power supply, PWR_ON-switch is high input voltage level (VREG) will
pulled high to BAT voltage, and make TP5100 the lithium-ion
PMOS is off. This pin can be used battery charging state until 8.4V
for power supply switching, and and enters shutdown state. If CS
monitoring power supply pin is floating, TP5100 becomes
functioning. 4.2V lithium-ion battery charging
GND (Pin 7): Power Ground. status until 4.2V, and enters
VS (Pin8): Positive input terminal shutdown state. Low input voltage
for output current detection. level shutdown TP5100. CS pin can
BAT(Pin9):Battery voltage be driven by TTL or CMOS voltage
detection terminal. The positive level.
terminal of the battery is connected
STDBY (Pin 14): Battery charging
to this pin.
VREG(pin10): internal power completion, green LED indicator.
supply. VREG is an internal power When the battery is fully charged,
supply, with an external 0.1uF internal switch pulls STDBY to low,
bypass capacitor to ground. indicating the completion of
Maximum current is up to 5mA. charging. Otherwise, the pin will be
TS(Pin11):The battery in a high impedance state.
temperature detection input
CHRG (Pin 15): Charging Status,
terminal. TS pin is connected to
NTC (negative coefficient Red LED indicator. When charging
temperature thermistor) sensor’s the battery, the internal switch pin is
output terminal of the battery. If TS pulled low, which means that
pin voltage is less than 45% or charging is in progress; otherwise
greater than 80% of VREG voltage, the pin is in high impedance state.
it means the battery temperature is
too low or too high, charging is
suspended. If TS is directly
connected to GND, battery
temperature detection function is
canceled, the other charging
function remain.
RTRICK(Pin12):Trickle
pre-charge current setting
terminal. If connecting RTRICK pin
to 50K resistance, then
pre-charging current is set to 20%

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

charging current is determined by

operational principle the resistance between VS pin and
TP5100 is designed for 8.4V / 4.2V VBAT pin. When the double
double/single-cell lithium-ion lithium-ion battery voltage
battery switching current charger approaches 8.4V (single-cell
chip, using a internal power lithium-ion battery close to 4.2V),
transistor for battery’s trickle, about 50mV to cut-off voltage
constant current and constant (depending on the resistance of the
voltage charging. Charge current circuit connection and internal
can be programmed by an external resistance of battery voltage), the
resistor, with maximum continuous charging current gradually
charge current up to 2A, and it does decreases, TP5100 enters constant
not require additional anti-intrusion voltage charging mode. When the
diodes. TP5100 consists of two charge current is reduced to cut-off
open-drain status output indicating current, charging cycle is complete,
terminals, charging status CHRG
the terminal CHRG outputs
terminal and battery fully charged
status STDBY terminal. The high-impedance state, while
internal chip power management
STDBY outputs lows voltage level.
circuitry automatically reduces the
charging current when the chip When the battery voltage falls
junction temperature exceeds below the recharge threshold
145 ℃; this feature allows users to (double lithium-ion battery 8.1V /
maximize the use of the chip's single-cell lithium-ion battery 4.05V),
power handling capability, and do it automatically starts a new
not worry about overheating and charging cycle. Chip precision
damages to the chip or chip internal voltage reference, error
external components. amplifier and the resistor divider
When the input voltage is greater network ensure the accuracy of the
than the chip start-up threshold battery terminal cutoff voltage
voltage, the chip is connected to a within ±1%, which meets the
high voltage level (VREG) or lithium-ion battery charging
floating, TP5100 begins to charge requirements. Power failure or the
battery voltage is lower than the
the battery. CHRG pin outputs at
input battery voltage, the charger
low voltage, means that charging is enters a low-power shutdown mode,
in progress. If double lithium-ion no external anti-intrusion diode is
battery voltage is lower than 5.8V needed, chip leakage from the
(single-cell lithium ion battery battery is closed to 1uA.
voltage is lower than 2.9V), battery
is pre-charged with trickle charger
at a small current level (pre-charge
current is adjustable through an
external resistor). Constant

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 南京拓品微电子有限公司
TP5100
NanJing Top Power ASIC Corp.

Charging cut-off voltage

selector
TP5100 has double / single lithium
two battery charging cut-off voltage
choices. When connecting CS
terminal to the high potential
(VREG), it is the 8.4V double
lithium-ion battery charging Figure 8 external controlled 8.4V
standard with cut-off voltage 8.4V. lithium-ion battery’s state of charging and
When the CS terminal is vacant, it shutdown mode swtching
is single-cell lithium-ion battery
Charging current setting
charging standard, with cut-off
voltage 4.2V. When CS is Battery charging current IBAT, is
connected to GND, the charger determined by the external current
stops charging. sensor resistor Rs, which can be
TP5100 has CS composite design, determined by the ratio of the
which in under external control for threshold voltage Vs across Rs and
switching between charging mode the constant charging current. The
and shutdown mode. voltage across Rs under the
When the CS side vacant, it means constant current is 100mV.
that TP5100 is a single-cell
lithium-ion charging battery.
8.4V double lithium-ion battery’s
switching of charging and shutdown
modes. As shown in Figure8, an
open-drain output port is connected
to the CS terminal. If the NMOS
transistor gate inputs low, N1 off,
then CS is high with cut-off
charging voltage of 8.4V; TP5100
charges double lithium-ion batteries.
When the NMOS transistor gate Figure 9 battery charging current setting
inputs high, N1 turns on, then CS Setting resistor and the charge
terminal is pulled down to GND, current are calculated using the
TP5100 is in shutdown mode. following formula ：
VREG pin can output 5mA driving 0.1V
current, selectable pull-up RS = (Current units A,
I BAT
resistance is within 1k-100k.
resistance units  ).
Examples:To set the charging
current to 1A, plugging into the
formula, we get Rs=0.1 

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TP5100
NanJing Top Power ASIC Corp.

Table 2 shows different values of Then pre-charging current is 1/5 of

Rs, corresponding to different the constant charging current. This
current setting, which is convenient pin only changes trickle current flow,
for circuit design. it has no effects on shutdown
Table 2: RS and its corresponding current, which is still remained at
constant charging current 10% of constant current.
RS (  ) I BAT (mA)
R R Setting resistor and
1 100 pre-charging current is calculated
0.2 500 using the following formula:
0.1 1000 400 kI TRICK − 40 kI BAT
0.067 1500 RTRICK =
I BAT − I TRICK
0.05 2000
In order to facilitate the customers’
Trickle pre-charging current design, table 3 shows the
relationship between RTRICK and
setting setting its pre-charging trickle
If the battery voltage is lower than current based on constant current
the pre-charge threshold voltage, IBAT.
TP5100 will start a pre-charging Table 3: RTRICK their settings trickle
process to charge the battery; current and constant current IBAT
TP5100 pre-charging current can relationship:
be set by TRICK port. The RTRICK (k) ITRICK (mA)
pre-charging current is set by a 50k 20% IBAT
resistor connected in between 114k 30% IBAT
TRICK pin and ground. 320k 50% IBAT
NC 100% IBAT

Charging termination
In constant voltage status, when
the charging current drops to 1/10
of the maximum constant current
value, the charging cycle is
terminated. This condition is
detected by using an internal
comparator filter to monitor the
voltage drop across Rs. When the
Figure 10 The TRICK end internal time for voltage drop across Rs to
circuit diagram reach 10mV is longer than tTERM
As can be seen from figure 10, If (typically 1.8ms), charging is
RTRICK port is connected to 50kohm terminated. When charging current
resistance, the ratio of the voltage is switched off, TP5100 enters
share across resistor is the ratio of standby mode, the input current
the pre-charging trickle flow to the supply drops to 120μA, and battery
constant pre-charging current flow. drain current outflow is around 1uA.
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TP5100
NanJing Top Power ASIC Corp.

In standby mode, TP5100

Power supply, battery power
continues to monitor the BAT pin
voltage. If the double lithium-ion
switching control
battery voltage across the pin falls
below 8.25V (single lithium battery TP5100 integrates power supply,
voltage drops to 4.05V) , which is battery power supply switching
below the rechargeable threshold control pin PWR_ON-. When
voltage VRECHRG, the new charging connecting VIN to input,
cycle begins and recharges the PWR_ON-outputs low can turn on
battery. PMOS. When VIN is removed,
PWR_ON-outputs high potential
Charging status indicator
(battery voltage) can turn off
TP5100 has two open-drain status PMOS.
output terminals, CHRG and STDBY .
When the charger is charging, CHRG
is pulled low, in other states, CHRG
is in high-impedance state. When
the battery temperature is outside
the normal temperature range,
both CHRG and STDBY pins output
high impedance. When the status
indicator is not used, the unused pin
is connected to the ground.
Table 4: charging indicator status Figure 11 Schematic of power switching
Green Red control
State of charge
STDBY CHRG Battery over-temperature
off on charging state
protection
on off Fully charged state
Under-voltage, To prevent damages caused by
battery temperature is either high or low temperature to
too high, too low, the battery, TP5100 integrated
off off under other fault internal battery temperature
condition or without detection circuit. Battery
battery access. (TS temperature is detected by
used) measuring TS pin voltage; which is
Green light, red light realized by the voltage division
flashes network of the internal NTC
T=0.5-2S thermistor and a resistor, as shown
in Figure 12. TP5100 compares its
two internal threshold voltages
VLOW and VHIGH to voltage across
TS pin to determine whether the
battery temperature is outside the

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TP5100
NanJing Top Power ASIC Corp.

standard range. Inside TP5100, given circuit board without the risk
VLOW is fixed at 45%  VREG and of damaging TP5100. It ensures
VHIGH is fixed at 80%  VREG . If the that the charger will automatically
reduce the current under
voltage across TS pin VTS  VLOW
worst-case conditions, and users
can set the charging current
or VTS  VHIGH , the battery
according to a typical (but not the
temperature is too high or too low, worst case) ambient temperature.
the charging process will be
Limiting and output short
suspended; if the voltage across TS
pin is in between VLOW and VHIGH,
circuit
the charging cycle resumes. If the
pin is connected to ground, battery TP5100 integrates a variety of
temperature detection function will protections; the chip has a limited
be disabled. input current which is 3A at
Example: under room temperature maximum to prevent damages due
25 ℃, RNTC = 10k; setting to excessive current. When the
protection temperature to be 60 ℃, output terminal voltage drops below
then RNTC = 3k, and the calculated approximately 1.2V, the chip enters
RNTC = 3.6k. The voltage across short circuit protection mode, the
NTC resistor is 45% of VREG , chip input current is limited to10%
which would terminates charging at of the maximum current value,
60 ℃. which is about 450mA. The current
value varies regarding different
input voltages.

Automatic restart
Once the charge cycle is
terminated, TP5100 immediately
adopts a comparator with 1.8ms
filter time (tRECHARGE) to monitor
voltage across BAT pin
continuously. When the battery
Figure 12 NTC connection diagram voltage drops below 90% of the
battery capacity, the charging cycle
Chip thermal limiting
begins again. This ensures that the
If the chip temperature attempts to battery is maintained at (or near) a
rise above 110 ℃ default value, fully charged status. In the
then an internal thermal feedback
recharging cycle, CHRG pin output
loop will reduce the charging
current setting value. This feature re-enters a strong pull-down state.
prevents overheating of TP5100,
Undervoltage lockout
and allows users to maximize the
power managing capability for a An internal undervoltage lockout

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TP5100
NanJing Top Power ASIC Corp.

circuit monitors the input voltage, considered even are irrelevant to

and keeps the charger in shutdown charger, because they will affect
mode before Vin rises above the overall temperature increase and
limited value of undervoltage the maximum charging current.
lockout. UVLO circuit will keep the
Inductor Selection
charger in shutdown mode and the
battery has no discharging current. To ensure system stability, in
If the UVLO comparator jumps, pre-charging and constant current
then the charger will not exit charging phases, the system needs
shutdown mode until VIN rises to ensure the operation is in
50mV higher than the battery continuous mode (CCM). According
voltage. Thus, customers do not to the inductor current formula:
have to worry about the power
1  VIN − VBAT 
I =    VBAT
L  FS  VIN
leaking when input power supply is
insufficient. 
Where I is the inductor ripple,
Thermal Considerations
FS is the switching frequency. In
Although QFN16 has small order to ensure both pre-charging
packaging dimensions, it has good and constant current charging
thermal dissipation characteristics. mode are in CCM, I is set to
The heat dissipation characteristics pre-charging current value, which is
can be further improved with a 1/5 of a constant charging current.
proper PCB design. It is suggested The inductance can be calculated
to adopt a well-designed PCB based on the input voltage
board layout for thermal dissipation, requirements.
in order to achieve increase in Inductance should be picked
charging current. Thermal path for greater or equal to 22uH (more
dissipating heat can be generated stable with larger inductance), it is
from the IC chip to the lead frame, recommended to use 22uH. If the
and through heat sink to reach the power is set to have VIN of 5V,
bottom of the chip through the PCB single 4.2V lithium-ion battery
copper surface. Copper area charging mode is used, and when
connected to the pin should be as setting the charging current to be
wide as possible and extends out to greater or equal to 500mA, 10uH
larger copper areas to better inductance can be used.
dissipate heat to the surrounding Inductive charging current is set to
environment. It is recommended to be greater than the charging
add more holes to internal and back current and inductor with smaller
copper circuit layer to improve the internal resistance should be
overall thermal performance of the chosen.
charger. When making the PCB
layout design, other heat sources
on the board must also be

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TP5100
NanJing Top Power ASIC Corp.

Packaging Description
4mm * 4mm 16-pin QFN package

Package Reel Pcs/ disc Tray / box Boxes / carton Pcs / box

QFN4*4 13Inch 5000 1 8 40000

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TP5100
NanJing Top Power ASIC Corp.

TP5100 Note
1. Capacitors should be as close as possible to the chip.
2. VS terminal, VIN terminal and BAT terminal should use parallel
combination of ceramic capacitor of 0.1uF with 10uF electrolytic capacitor,
X5R or X7R level ceramic capacitor.
3. Selecting inductors with sufficient power.
4. Choosing Schottky diode with better or equal capability of voltage
conduction and decreasing current, compared with 2A Schottky diode.
5. For VIN and LX, the current loop should be wider than normal signal lines.
6. Pay attention to the nodal locations of each capacitance grounding wire,
grounding point should be focused to have better grounding effects.
7. When using the chip in heavy-current work, users should pay attention to
the connection of heat sink at the bottom of chip to PCB to ensure good heat
dissipation.

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