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HC2018集成同步整流IC 外围元器件少 5V3.1A方案
HC2018 has an optimum input voltage, step- down converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. The maximum input voltage is up to 36V and the operation input voltagefrom8.5Vto32V.
MOSFET, what build in 50mΩ High-Side and
30mΩ Low-Side, could deliver up to 2.8A of continuous output current.
External compensation is not needed. The line compensation and the constant current can be set by an external resistance.
In conclusion, HC2018 is a full function and high performance, high reliability buck DC-DC converter.
FEATURES
· Build in High-Side and Low-Side MOSFET
· Max Output Current: 2.8A
· Adjustable Output Voltage, VFB=1V
· Constant Voltage Accurate: ±2%
· No External Compensation Needed
· Efficiency: Up to 92%
· Short Circuit Protection
· Over Voltage Protection
· Thermal shutdown Protection
· Under Voltage Lock-Out
· Available in SOP-8 package
· ESD HBM >5KV
APPLICATIONS
· Car DVD
· Black Box
· Car Charger
· Industry Application
TYPICAL APPLICATION PIN OUT & MARKING
ote: 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
SOP-8
HC2018: Product Code
TXXX: Date code (Year & Week)
RDERING INFORMATION
PART No. |
PACKAGE |
Tape&Reel |
HC2018 |
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 to GND |
-0.3 to 6 V |
|
Max Operating Junction Temperature(Tj) |
125°C |
|
Ambient Temperature(Ta) |
-40°C – 85°C |
|
Package Thermal Resistance (qjc) |
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 |
RDSON Of Power MOS |
IOUT=1A |
- |
50 |
70 |
mΩ |
Low side |
IOUT=1A |
- |
30 |
45 |
mΩ |
|
TSD |
Thermal Shutdown Temp |
|
- |
155 |
- |
°C |
TSH |
Thermal Shutdown Hysteres |
|
- |
30 |
- |
°C |
PIN DESCRIPTION
PIN # |
NAME |
DESCRIPTION |
1 |
FB |
Feedback |
2 |
NC |
|
3 |
NC |
|
4 |
VIN |
Input Supply Voltage |
5, 6 |
SW |
Power Switching Output |
7, 8 |
GND |
Ground |
TYPICAL PERFORMANCE CHARACTERISTICS
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Efficiency vs. Iout
Vin=12V Vin=24V Vin=31V
250
200
150
100
50
0
△Vout vs. Iout
(R2=100K)
180
160
140
120
100
80
60
40
20
0
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8
Iout (A)
Switch Frequency vs.Temp
(RLIM=2M)
-40 -20 0 20 40 60 80 100 120 140 160
Temp (℃)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8
Iout (A)
Supply Current vs. Temp
-40 -20 0 20 40 60 80 100 120 140 160
Temp (℃)
Short Circuit Short Circuit Vin=12V, Freq=3.3Hz Vin=12V, Freq=54kHz (CH3=SW) (CH3=SW)
Power On Power Off
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)
DETAILED DESCRIPTION
Input Under Voltage Protection
HC2018 provides an input voltage up to 36V and
?I =
1 V
× V 1 ?
V
operates from an input voltage range of 8.5V to 32V. If VIN drops below 6.8V, the UVLO circuit inhibits switching. Once VIN rises above 8.5V, the UVLO clears, and the soft-start sequence activates.
Input Over Voltage Protection
If VIN rises above 32V, the UVLO circuit inhibits switching. HC2018 will not be damaged until the voltage exceeds 36V. Once VIN drops below 30V, the UVLO clears, and the soft-start sequence activates.
Soft-start
HC2018 has an 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
HC2018 presets the VFB voltage to 1V. The Output
Voltage can be set by extra resistance.
Short Circuit Protection
When VOUT drops below 2V since too heavy load, HC2018 will enter 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: Vcαble co行pen:;αιιon = Iout(A) ? R2/1000
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.
Thermal Shutdown
The junction temperature of the IC is monitored internally. If the junction temperature exceeds the threshold value (typically 155°C), the converter shuts off. This is non-latch protection. There is about 30°C hysteresis. Once the junction temperature drops around 125°C, it initiates a Soft-start.
PACKAGE OUTLINE
Package |
SOP-8 |
Devices per reel |
4000 |
Unit |
mm |
Package specification: |