HC2018 A

36V, 2.8A CC&CV Buck Converter

DESCRIPTION
FEATURES
HC2018A has an optimuminput voltage, step-
down converter that operates in either CV  Build in High-Side and Low-Side MOSFET
(Constant Output Voltage) mode or CC (Constant  Max Output Current: 2.8A
Output Current) mode. The maximum input  Adjustable Output Voltage, VFB=1V
voltage is up to 36V and the operation input  Constant Voltage Accurate: ±2%
voltagefrom8.5Vto32V.IncludingBC1.2/APPLE/SA  No External Compensation Needed
MSUNG/ charging protocol.  Efficiency: Up to 92%
 Short Circuit Protection
MOSFET, what build in 50mΩ High-Side and  Over Voltage Protection
30mΩ Low-Side, could deliver up to 2.8A of
 Thermal shutdown Protection
continuous output current.
 Under Voltage Lock-Out
 Available in SOP-8 package
External compensation is not needed. The line
 ESD HBM >5KV
compensation and the constant current can be
set by an external resistance.
APPLICATIONS
In conclusion, HC2018A is a full function and high
performance, high reliability buck DC-DC converter.  Car DVD
 Black Box
 Car Charger
 Industry Application

TYPICAL APPLICATION PIN OUT & MARKING

4 5,6
FB GND
2
TXXX
HC2018 A

1 D+ GND
3
D- SW

7,8 VIN SW

SOP-8
HC2018 A : Product Code
TXXX: Date code (Year & Week)
Note: 1) It is recommended to use Cin and Cout as high-frequency low-ESR
capacitors for Rubycon and Wurth.
2) The inductor core is recommended for the iron silicone Aluminum
ring.
RDERING INFORMATION

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 HC2018 A
PART No. PACKAGE Tape&Reel
HC2018A SOP-8 4000/Reel

ABSOLUTE MAXIMUM RATING

Parameter Value
VIN to GND -0.3 to 36 V
SW to GND -0.3 to 32 V
FB, D+,D- to GND -0.3 to 6 V
Max Operating Junction Temperature(Tj) 125C
Ambient Temperature(Ta) -40C – 85C
Package Thermal Resistance (jc) SOP-8 45C / W
Storage Temperature(Ts) -40C – 150C
Lead Temperature & Time 260C, 10S
ESD (HBM) >5000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.

ELECTRICAL CHARACTERISTICS
(Vin=12V, TA=25C, unless otherwise stated)
Symbol Parameter Conditions Min Typ Max Unit
VIN Input Voltage 8.5 - 36 V
VOVP-VIN Input OVP Threshold 30 32 36 V
VUVLO UVLO Voltage 7 8.5 9 V
UVLO Hysteresis - 1 - V
ICCQ Quiescent Current VOUT=5.8V - 1.5 2.5 mA
ISB Standby Current No Load, Vin>8.5V - 1.6 3 mA
VOVP Ouput OVP detect Voltage Internal define - 6 - V
FSW Switching Frequency IOUT=1A - 150 - KHz
VOUT VOUT-Short 2.4 2.6 2.8 V
Line Compensation Vin=12V, IOUT=2.8A, R2=100K - 240 - mV
High side IOUT=1A - 50 70 mΩ
RDSON Of Power MOS
Low side IOUT=1A - 30 45 mΩ
TSD Thermal Shutdown Temp - 155 - °C
TSH Thermal Shutdown Hysteresis - 30 - °C

PIN DESCRIPTION
PIN # NAME DESCRIPTION
1 FB Feedback
2 D+ Connected to the D+ Line of USB Connector
3 D- Connected to the D-Line of USB Connector
4 VIN Input Supply Voltage
5, 6 SW Power Switching Output
7, 8 GND Ground
TYPICAL PERFORMANCE CHARACTERISTICS

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 HC2018 A
Efficiency vs. Iout △Vout vs. Iout
100% (R2=100K)
90% 250

80%
200
70%
Efficiency (%)

60%

△Vout (V)
150
50%
40%
100
30%
20% Vin=12V
50
10% Vin=24V
Vin=31V
0% 0
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8
Iout (A) Iout (A)

Switch Frequency vs.Temp Supply Current vs. Temp

(RLIM=2M) 2.0
180
1.8
160
1.6
140
1.4
Supply Current (mA)
Frequency (KHz)

120
1.2
100
1.0
80 0.8
60 0.6
40 0.4
20 0.2
0 0.0
-40 -20 0 20 40 60 80 100 120 140 160 -40 -20 0 20 40 60 80 100 120 140 160
Temp (℃) Temp (℃)

Short Circuit Short Circuit

Vin=12V, Freq=3.3Hz Vin=12V, Freq=54kHz
(CH3=SW) (CH3=SW)

Power On Power Off

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 HC2018 A
Vin=12V, Vout=5.05V, Iout=2.4A Vin=12V, Vout=5.05V, Iout=2.4A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw) (CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)

Power On Power Off

Vin=24V, Vout=5.05V, Iout=2.4A Vin=24V, Vout=5.05V, Iout=2.4A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw) (CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)

Output Voltage Ripple Output Voltage Ripple

Vin=12V, Vout=5.05V, Iout=2.4A Vin=24V, Vout=5.05V, Iout=2.4A
(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw) (CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)

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 HC2018 A
DETAILED DESCRIPTION
Input Under Voltage Protection 1
∆ = × 1−
HC2018A provides an input voltage up to 36V and
operates from an input voltage range of 8.5V to 32V.
Thermal Shutdown
If VIN drops below 6.8V, the UVLO circuit inhibits
The junction temperature of the IC is monitored
switching. Once VIN rises above 8.5V, the UVLO
internally. If the junction temperature exceeds
clears, and the soft-start sequence activates.
the threshold value (typically 155°C), the
Input Over Voltage Protection converter shuts off. This is non-latch protection.
If VIN rises above 32V, the UVLO circuit inhibits There is about 30°C hysteresis. Once the junction
switching. HC2018A will not be damaged until the temperature drops around 125°C, it initiates a
voltage exceeds 36V. Once VIN drops below 30V, Soft-start.
the UVLO clears, and the soft-start sequence
activates.
Soft-start
HC2018A has na internal soft-start circuitry to reduce
supply inrush current during startup conditions.
When the device exits under-voltage lockout
(UVLO), shutdown mode, or restarts following a
thermal-overload event, the soft-start circuitry
slowly ramps up current available after 300us.
Constant Voltage Output
HC2018A presets the FVB voltage to 1V. The Output
Voltage can be set by extra resistance.

Short Circuit Protection

When VOUT drops below 2V since too heavy load,
HC2018A willenter short circuit protection function,
and the system will enter hit-cup mode, and
frequency drop to 54KHz per cycle and stop
switching for 300mS.
Line Compensation
When users use different cables, it will produce
different voltage drop, the users can set their own
cable compensation voltage according to the need:
= ( ) ∗ 2/1000
Inductor Selection
For most applications, the value of the inductor
will fall in the range of 10uH to 33uH. Its value is
chosen based on the desired ripple current. Large
value inductors lower ripple current and small
value inductors result in higher ripple currents.
Higher VIN or VOUT also increases the ripple
current and value inductors result in higher ripple
currents. Higher VIN or VOUT also increases the
ripple current as shown in equation.

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 HC2018 A

PACKAGE OUTLINE
Package SOP-8 Devices per reel 4000 Unit mm
Package specification：