Preliminary Datasheet LP5306

Over Voltage and Over Current Protection IC

General Description Features

The LP5306 is a highly integrated circuits, it used to  Withstand High Input Voltage Up to 26V
protect low voltage system from abnormal high input  Adjustable Over Current Protection
voltage. The IC continuously check the input voltage,  Input Over Voltage Protection
the input current, and the battery voltage. When the  Battery Over Voltage Protection
protection status is occur, the power MOS will turn off  High Accuracy Protection Thresholds
at the same time. The LP5306 is safety devices to  Fault Signal Output
ensure worked against accidents.  Enable Control
 Under Voltage Lockout
In case of the input voltage exceeds a OVP threshold  Output Short-Circuit Protection
voltage level, the power MOS will turn off within 1μs.  Over-Temperature Protection
The current limit can is adjustable by external resistor  Available in DFN-8
between ISET and GND. And the current is also  RoHS Compliant and Halogen Free
limited to prevent charging the battery with an
excessive current. The LP5306 also monitors the
Li-ion battery voltage, when the battery voltage Applications
exceeds 4.35V, the IC will turn off the MOS.
 Cell Phones
Other features include over temperature protection  Digital Cameras
and under-voltage lockout (UVLO). The LP5306  Portable Instruments
is available in a space saving DFN-8 package.

Order Information Marking Information

Device Marking Package Shipping
LP5306 □□□ LP5306 LPS DFN-8 3K/REEL
F: Green LP5306
Package Type
YWX
QV: DFN-8
Y: Y is year code. W: W is week code. X: X is series number.

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 Preliminary Datasheet LP5306

Typical Application Circuit

VBUS
VIN VOUT VOUT
VDD
Cin
LP5306 COUT
RPU

Fault Fault
H/L EN BAT
RBAT
ISET GND

RSET
Battery

Figure 1. Typical Application Circuit of LP5306 .

Pin Configuration

VIN 1 8 VOUT

GND 2 7 ISET
Exposed
Pad
NC 3 6 BAT

Fault 4 5 EN

Figure 2. Package Top View

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 Preliminary Datasheet LP5306

Function Block Diagram

VIN VOUT

Driver OCP ISET

Switch

UVLO OTP
Fault
OVP OSC
BAT
EN
Control GND
Logic
Fault

Figure 3. Function Block Diagram

Functional Pin Description

Pin NO. DFN8 Description

VIN 1 Power source input. Connect a ceramic capacitor between VIN and GND.

GND 2 Ground.

NC 3 No connect.

Fault 4 Fault output pin. Open-drain output, device status.

EN 5 Enable pin.

BAT 6 Battery voltage detector input.

ISET 7 OCP level setting by an external resistor to GND.

VOUT 8 Output through the power MOSFET.

EP Exposed pad. Connect EP to GND is suggested.

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 Preliminary Datasheet LP5306

Absolute Maximum Ratings Note1

 VIN to GND -------------------------------------------------------------------------------------------------------- -0.3V to +30V

 VOUT to GND ---------------------------------------------------------------------------------------------------- -0.3V to +7V

 All Other Pin to GND -------------------------------------------------------------------------------------------- -0.3V to +7V

 Operating Junction Temperature Range (TJ) -------------------------------------------------------- -40℃ to 150℃

 Operation Ambient Temperature Range ------------------------------------------------------------- -40°C to +105°C

 Storage Temperature Range ---------------------------------------------------------------------------- -65°C to +150°C

 Maximum Soldering Temperature (at leads, 10sec) ----------------------------------------------- +260°C

Note1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Thermal Information
 Thermal Resistance

DFN-8, θJA ----------------------------------------------------------------------------------------------------- 76.11 °C/W

Recommended Operating Conditions

 Input Voltage, VIN ------------------------------------------------------------------------------------------------- 3.3V to 5V

 Output Current, IOUT --------------------------------------------------------------------------------------------- 0.3A to 1.5A

 OCP Set Resistance, RSET ------------------------------------------------------------------------------------ 15kΩ to 90kΩ

 Junction Temperature, TJ -------------------------------------------------------------------------------------- -40°C to 125°C

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 Preliminary Datasheet LP5306

Electrical Characteristics
(VIN = 5V, TA = 25°C, Unless Otherwise Specified)
Parameter Symbol Test Conditions Min Typ Max Units
General Function

Power Source Voltage VIN TJ= +25 °C 3.3 5 26 V

Input UVLO Threshold VUVLO VIN Rising 2.5 2.7 2.9 V

UVLO Threshold Hysteresis ΔVUVLO Falling Hysteresis 200 mV

Power On Deglitch Time TDeglitch 8 ms

Soft Start Time TSS 8.2 ms

Power Source Current IIN VIN=5V, EN=L 400 µA

Shutdown Current ISD VIN=5V, EN=H 55 uA

Thermal Shutdown Threshold TSD 140 °C

Thermal Shutdown Threshold
ΔTSD 20 °C
Hysteresis
Logic Function

VENH 1.4 V
EN Threshold Voltage
VENL 0.4 V

EN Input Resistance to GND IEN EN=2V 15 uA

FAULT Output Logic Low Sink 5mA 0.2 V

FAULT Logic High Leakage Current Fault=5V 10 uA

Power MOS

Switch On Resistance RDS(ON) IOUT=1A 160 250 mΩ

Protection Functions

Input Over Voltage Protect threshold VIOVP VIN from 5V to 10V 6.8 V

Input OVP threshold Hysteresis ΔVIOVP VIN from 10V to 5V 50 mV

Input OVP Recovery Delay Time TOVPR 8.2 ms

RSET = 24.9K,
Over Current Protection IOCP 1 A
3.3V<VIN<VIOVP
OCP Blanking Time TOCP 200 us

Over Current Recover Delay TOCR 65 ms

Battery Voltage OVP VBOVP VIN=5V 4.35 V

Battery OVP Hysteresis ΔVBOVP VIN=5V 0.275 V

Battery OVP Blanking Time TBOVP VIN=5V 200 us

BAT Pin Leakage Current IBAT VIN=5V, VBAT=4.4V 10 nA

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 Preliminary Datasheet LP5306

Typical Performance Curves

TA=25°C, VIN= VOUT=5V, VBAT=4.2V, VDD=5V, VEN=0V, unless otherwise specified.

1.6

Current Limit (A)

1.2
VIN 2V/div.
0.8
VOUT 2V/div.

VFault 5V/div. 0.4

IIN 2A/div.
0
0 20 40 60 80 100
200ms/div. RSET(kΩ)
Figure 4. VOUT short to GND Figure 5. RSET vs. Current Limit

700 100
90
600
Quiescent Current (uA)

80
Shutdown Current (uA)

500 70

400 60
50
300 40
200 30
20
100
10
0 0
3 4 5 6 7 3.3 3.8 4.3 4.8 5.3 5.8
Input Voltage (V) Input Voltage (V)

Figure 6. Input Voltage vs. Quiescent Current Figure 7. Input Voltage vs. Shutdown Current

1.4 4.5

1.2
4.45
Enable Threshold (V)

1
BAT_OVP (V)

4.4
0.8
4.35
0.6

0.4
EN(H) 4.3

0.2
EN(L) 4.25

0 4.2
3 3.5 4 4.5 5 5.5 3 4 5 6
Input Voltage (V) Input Voltage (V)

Figure 8. Input Voltage vs. Enable Threshold Figure 9. Input Voltage vs. Battery OVP

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 Preliminary Datasheet LP5306

Application Information
The LP5306 devices monitor the input voltage, Over Current Protection
battery voltage, and output current to protect the
The Over Current threshold can adjustable by a
charging system of a Li-Ion battery. When enabled,
external resistor RSET connected from the ISET pin
the system is protected against input overvoltage by
to GND. The equation is apply under below:
turning off an internal switch, immediately removing
power from the charging circuit. For an over-current IOCP =25000÷RSET
condition, the device limits the output current at the If the output current exceed the IOCP threshold, the
setting value, and if the over-current persists, the device limits the current for a blanking duration of TOC.
switch will turn off after a blanking time. Additionally, If the over current situation exceeds the TOC, the
the device also monitors its own temperature and switch will turned off, and the Fault pin is go low. The
switches off if device too hot. switch will re-soft start again after TOCR. And the
Under Voltage Lockout (UVLO) switch is turned off permanently, when over current
The LP5306 had an UVLO internal circuit that enable event occurs 15 times in one charge cycle. For
the device once the voltage on the VIN voltage cleared this event, the VIN power or EN need to
exceeds the UVLO threshold voltage. re-cycled
Input Over Voltage Protection Layout Consideration
The LP5306 Input has an over voltage protection to The proper PCB layout and component placement are
protect the battery charging system. When the VIN critical for all circuit. LP5306 is meant to protect
voltage rises above 6.8V(Typ.), the system will turns downstream circuit. Here are some suggestions to the
the switch off. layout design.
1. Connected all ground together with one
Battery Over Voltage Protection uninterrupted ground plane, which include power
The battery overvoltage threshold VBOVP is internally ground and analog ground.
set to 4.35V. If the battery voltage exceeds the 2. The input and output capacitor should be located as
threshold, the switch is turned off, and the Fault pin is closed as possible to the chip and ground plane.
go low. Once the battery voltage drops to (VBOVP- 3. Other components should be located close to the
ΔVBOVP), the switch is turned back on. And the switch chip.
is turned off permanently, when battery overvoltage
VIN VOUT
occurs 15 times in one charge cycle. For cleared this VIN 1 8 VOUT COUT
event, the VIN power or EN need to re-cycled.
Cin

Over Temperature Protection GND 2 7 ISET RILIM

Exposed
The LP5306 device enters over temperature Pad
NC 3 6 BAT RBAT
protection(OTP) if its junction temperature exceeds
140°C (Typ.). During over temperature protection Fault 4 5 EN
LP5306
none of the device's functions are available. To
resume normal operation the junction temperature GND
need cool down, and the outputs will restart. Figure10. Recommended PCB Layout Diagram
Enable Control
The LP5306 has an enable pin which can be used to
enable or disable the device. When the EN pin is
driven high, the switch is turned off. The EN pin has
an internal pull-down resistor can be floating.
Fault Flag
The FAULT pin is open-drain output.
• Input Over Voltage
• Output Over Current
• Battery Over Voltage
• Over Temperature

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 Preliminary Datasheet LP5306
Outline Information
DFN-8 Package (2×2) pitch 0.5 (Unit: mm)

D D2

LPS
E LP5306 E2

YWX
h
h

1
e b
A Nd
A3
A1

DIMENSION IN MILLIMETER
SYMBOL
MIN NOM MAX
A 0.70 0.750 0.80
A1 --- 0.020 0.050
A3 0.180 0.200 0.250
b 0.200 0.250 0.300
D 1.900 2.000 2.100
D2 1.500 1.600 1.700
E 1.900 2.000 2.100
E2 0.800 0.900 1.100
e 0.500 BSC
Nd 1.500 BSC
L 0.250 0.300 0.350
h 0.150 0.200 0.250

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