BELLING BL9382

BL9382
18V (30V spike) 2A Synchronous Buck Converter
DESCRIPTION
FEATURES
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The BL9382 is a high efficiency current-mode
synchronous, 18V/2A buck converter. Its input
voltage ranges from 4.5V to 18V and it provides
an adjustable regulated output voltage from
0.923V to 15V while delivering up to 2A of output
current.
The internal synchronous switches increase
efficiency and eliminate the need for an external
Schottky diode. The switching frequency is set to
340KHz.
BL9382 consists of many protection block such as
UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal
protection and output short circuit protection.
Adjustable Output Voltage, Vfb=0.923V
Maximum output current is 2A
Range of operation input voltage: Max 18V
Withstand input voltage spike >30V
Standby current: 1mA (typ.)
Operating current at zero load: 1.2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 95%
Input OVP at 20V
Environment Temperature: -20C~85C
APPLICATIONS
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The BL9382 is available in the SOP8 and ESOP8
(with exposed pad for heat dissipation) package
Set-top-box
Consumer Electronic Device for automobile
LCD Monitor and LCD TV
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery
powered device
TYPICAL APPLICATION
PIN OUT
10uH
0.1uF
BST
SS
VOUT
3.3V/2A
10nF
100K
VIN
VIN
EN
LC2321
BL9382
10uF
SW
3.3nF
5.6K
COMP
*Cc optional
GND
FB
10K
22uF
x2
SOP8 and ESOP8
26.1K
* When Vin is as low as 5V, Cc is recommended to
be 100pf, but not needed when Vin larger than 5V.
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BL9382
MARK and ORDERING INFORMATION
Mark Explanation
Ordering Information
XX: Year
YY: Week
ZZ: Internal code
SOP8
2500pcs/reel
BL9382CD8TR
ESOP8
2500pcs/reel
BL9382CS8TR
PINOUT DESCRIPTION
PIN #
1
2
3
4
5
NAME
BST
VIN
SW
GND
FB
6
COMP
7
EN
8
SS
DESCRIPTION
High side power transistor gate drive boost input
Power input, the input capacitor should be placed as close to VIN and GND pin as possible
Power switching node to connect inductor
Ground.
Feedback input with reference voltage set to 0.923
Compensation node. A serial RC connected to this pin is required to maintain the Buck
converter control loop stable.
Enable input. Setting it to high level or connecting to Vin via a resistor may turn on the chip,
while setting it to ground level will turn off the chip.
Soft-start node. Connecting a 0.1uF capacitor to ground make the Buck converter output rise
smoothly.
BLOCK DIAGRAM
SS
VIN
UVLO &
Thermal
shutdown
0.923V Ref
+
ISense
5V
BST
-
+
+
-
Σ
Comp
Network
-
EA
EN
PWM
Logic
Anti-ShootThrough
Driver
SW
Slope Comp
+
OSC
Vcomp
-
FB
COMP
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GND
BL9382
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
SOP-8L
Package Thermal Resistance (jc)
ESOP-8L
Storage Temperature(Ts)
Lead Temperature & Time
ESD (HBM)
30V
125C
-20C – 85C
45C / W
10C / W
-40C - 150C
260C, 10S
>2000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum
rating conditions may affect device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Input Voltage Range
Operating Junction Temperature(Tj)
Max. 18V
-20C –125C
ELECTRICAL CHARACTERISTICS
(VIN=12V, TA=25C)
Symbol
Parameter
VDD
Input Voltage Range
UVLO_UP
UVLO,IN UVLO Rising
Vref
Feedback Voltage
Ifb
Feedback Leakage current
Iq
Quiescent Current
Conditions
Min
Typ
4.5
Record VIN pin voltage as
V(UVLO) when
measure I(IN)> 500uA
Vin=12V, Ven=5V
3.8
0.900
Active, Vfb=1V, No Switching
Shutdown, Vin=8V
4.1
0.923
Max
Unit
18
V
4.4
V
0.946
V
0.1
0.4
uA
1.1
1.5
mA
6
10
uA
LnReg
Line Regulation
Vin=5V to 12V
0.1
%/V
LdReg
Load Regulation
Iout=0.1 to 2A
0.02
%/A
Switching Frequency
Ven=2V, Vin=12V
340
KHz
RdsonP
Fsoc
PMOS Rdson
130
mohm
RdsonN
NMOS Rdson
110
mohm
Ilimit
Peak Current Limit
Venh
EN High Threshold
Venl
EN Low Threshold
Vovp
Input Over-Voltage Protection
TSD
Over Temperature Proection
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Ven=2V
1.5
18
V
0.5
V
V
160
3
A
2
C
BL9382
TYPICAL PERFORMANCE CHARACTERISTICS
(Vin=12V, Vout=3.3V, L=10uH, Cin=10uF, Cout=22uF, TA=25C, unless otherwise stated)
Fast Transient Response
Startup through Enable
Shutdown through Enable
Short Circuit Recovery
Switching waveform Vin=18V, Iout=0
Switching waveform Vin=18V, Iout=2A
VIN
VIN
VOUT
VOUT
I_L
SW
SW
I_L
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BL9382
Switching waveform Vin=5V, Iout=0
Switching waveform Vin=5V, Iout=2A
VOUT
VOUT
VIN
VIN
SW
SW
I_L
I_L
FUNCTIONAL DECRIPTIONS
Loop Operation
The BL9382 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to
2A of output current, integrated with a 110m synchronous MOSFET, eliminating the need for external diode. It uses a
PWM current-mode control scheme. An error amplifier integrates error between the FB signal and the internal reference
voltage. The output of the integrator is then compared to the sum of a current-sense signal and the slope compensation
ramp. This operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation
for output voltage.
Current Limit
There is a cycle-by-cycle current limit on the high-side MOSFET of 3A(typ). When the current flowing out of SW exceeds
this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. Unlike the traditional method of
current limiting by limiting the voltage at the compensation pin, which usually has large variation due to duty cycle
variance, this type of peak current limiting scheme provides a relatively more accurate limit for output current, thereby
lowering the requirements for system design.
Faster Transient Response
Normally, people use 3.3nF and 5.6Kohm RC for compensation to keep the loop stable. However, if one needs to have
faster load transient response, 3.3nF and 8.5Kohm is recommended.
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BL9382
COMPONENT SELECTRION
When setting up the BL9382 for different output voltage, please use following recommended component value for the
best performance.
VOUT (V)
8
5
3.3
2.5
1.8
1.2
COUT (F)
22x2
22x2
22x2
22x2
22x2
22x2
L (H)
22
15
10
6.8
4.7
3.3
THERMAL CONSIDERATION
BL9382 is high efficiency Buck converter, which means it consumes very few power when converting the high voltage to
low voltage. However, when output power is very large, like 5V/2A, the output power is as high as 10W, a heat
dissipation path is strongly recommended to be routed on PCB. BL9382 has two different SOP8 package. For the normal
SOP8, the heat is conducted out via Pin 4 (GND), so the heat dissipation route on PCB should be connected to the Pin 4
of the chip. If ESOP8 is selected, the heat dissipation copper area should be exposed and connected to the exposed pad
underneath the chip body.
When output power is larger than 10W, the ESOP8 package is recommended.
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BL9382
PACKAGE OUTLINE
Package
SOP8
Devices per reel
2500
Unit
mm
Devices per reel
2500
Unit
mm
Package specification：
Package
ESOP8
Package specification：
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