BL9382C
2A, 24V Synchronous
Step-Down Converter
DESCRIPTION
The BL9382C is a current mode monolithic buck
voltage converter. Operating with an input range
of 4.5-24V, the BL9382C delivers 2A of
continuous output current with two integrated
N-Channel MOSFETs. At light loads, regulators
operate in low frequency to maintain high
efficiency and low output ripple.
The BL9382C guarantees robustness with over
current protection, thermal protection, start-up
current run-away protection, and input under
voltage lockout.
The BL9382C is available in a 8-pin SOP8
package, which provides a compact solution with
minimal external components.
FEATURES
4.5V to 24V operating input range
2A output current
Up to 94% efficiency
High efficiency (85>%) at light load
Fixed 500kHz Switching frequency
Input under voltage lockout
Available in SOP8 package
Start-up current run-away protection
Over current protection
Thermal protectio
n
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
TYPICAL APPLICATION
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V1.0
BL9382C
PIN CONFIGURATION
TOP VIEW
ABSOLUTE MAXIMUM RATING
1）
VIN, EN, SW Pin ................................................................................................................. -0.3V to 24V
BST Pin ................................................................................................................... SW-0.3V to SW+5V
All other Pins ......................................................................................................................... -0.3V to 6V
Junction Temperature
2) 3)
..................................................................................................................150ºC
Lead Temperature
......................................................................................................................260ºC
Storage Temperature .................................................................................................. -65ºC to +150ºC
RECOMMENDED OPERATING CONDITIONS
Input Voltage VIN ................................................................................................................4.5V to 24V
Output Voltage Vout................................................................................................................. 0.6V to 22V
Operating Junction Temperature(T
J
)....................................................................................-40ºC to 125ºC
THERMAL PERFORMANCE
4）
Note：
1)
2)
3)
θ
JA
θ
Jc
SOP8 ..................................................................................................................................... 90...45ºC/W
4)
Exceeding these ratings may damage the device.
The BL9382C guarantees robust performance from -40°C to 150°C junction temperature. The junction temperature
range specification is assured by design, characterization and correlation with statistical process controls.
The BL9382C includes thermal protection that is intended to protect the device in overload conditions. Thermal
protection is active when junction temperature exceeds the maximum operating junction temperature. Continuous
operation over the specified absolute maximum operating junction temperature may damage the device.
Measured on JESD51-7, 4-layer PCB.
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V1.0
BL9382C
ELECTRICAL CHARACTERISTICS
VIN=12V, T
A
=25
℃,
unless otherwise stated.
Item
V
IN
Undervoltage Lockout Thershold
V
IN
Undervoltage Lockout Hysteresis
Shutdown Supply Current
Supply Current
Feedback Voltage
Top Switch Resistance
Bottom Switch Resistance
Top Switch Leakage Current
Symbol
V
IN_MIN
V
IN_MIN_HYST
I
SD
I
Q
V
FB
R
DS(ON)T
R
DS(ON)B
I
LEAK_TOP
Condition
V
IN
falling
V
IN
rising
V
EN
=0V
V
EN
=5V, V
FB
=2V
Min.
Typ.
3.8
300
Max.
Units
V
mV
1
50
0.895
0.923
170
110
0.951
μA
μA
V
mΩ
mΩ
V
IN
=24V, V
EN
=0V,
V
SW
=0V
V
IN
=24V, V
EN
=0V,
V
SW
=0V
Minimum Duty Cycle
3.8
500
100
V
FB
=0.7V
V
EN
falling, FB=0V
V
EN
rising, FB=0V
100
1.2
100
145
19
0.5
uA
Bottom Switch Leakage Current
Top Switch Current Limit
Switch Frequency
Minimum On Time
Minimum Off Time
EN shut down threshold voltage
EN shut down hysteresis
Thermal Shutdown
Temperature Hysteresis
I
LEAK_BOT
I
LIM_TOP
F
SW
T
ON_MIN
T
OFF_MIN
V
EN_TH
V
EN_HYST
T
TSD
T
HYS
0.5
uA
A
kHz
ns
ns
V
mV
℃
℃
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V1.0
BL9382C
PIN DESCRIPTION
PIN
1
NAME
BST
Description
Boostrap pin for top switch. A 0.01uF or larger capacitor should be connected between this
pin and the SW pin to supply current to the top switch and top switch driver.
Input voltage pin. VIN supplies power to the IC. Connect a 4.6V to 24V supply to VIN and
bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
SW is the switching node that supplies power to the output. Connect the output LC filter
from SW to the output load.
Power ground pin.
Output feedback pin. FB senses the output voltage and is regulated by the control loop to
0.8V. Connect a resistive divider at FB.
Not Connected.
Drive EN pin high to turn on the regulator and low to turn off the regulator.
Not Connected.
2
IN
3
4
5
6
7
8
SW
GND
FB
NC
EN
NC
BLOCK DIAGRAM
VIN
Current
Ramp
+
+
Oscillator
CLK
3.3V
Current
Sensor
-
BST
+
SS
0.6V
FB
+
Error
+ Amplifier
-
Current
Comparator
-
Logic
Control
SW
-
3.3V LDO
Current
Sensor
+
1.3V
+
GND
EN
-
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V1.0
BL9382C
TYPICAL PERFORMANCE CHARACTERISTICS
Vin =12V, Vout = 3.3V, L = 4.7μH, Cout = 22μF, TA = +25°C, unless otherwise noted
Steady State Test
VIN=12V, Vout=3.3V
Iout=2A
Startup through Enable
VIN=12V, Vout=3.3V
Iout=2A(Resistive load)
Shutdown through Enable
VIN=12V, Vout=3.3V
Iout=2A(Resistive load)
Heavy Load Operation
2A LOAD
Medium Load Operation
1A LOAD
Light Load Operation
0 A LOAD
Short Circuit Protection
VIN=12V, Vout=3.3V
Iout=2A- Short
Short Circuit Recovery
VIN=12V, Vout=3.3V
Iout= Short-2A
Load Transient
1A LOAD
→
2A LOAD
→
1A LOAD
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