BL9342
40V, 600mA , Step-Down Converter
Description
The BL9342 is a high frequency (1.8MHz) step-down switching regulator with
integrated internal high-side high voltage power MOSFET. It provides single
0.6A(or less) highly efficient output with current mode control for fast loop
response.
The wide input range(4.2V to 40V) accommodates a variety of step-down
applications. Low shutdown mode quiescent current allows use in
battery-powered applications.
High efficiency at light load condition is achieved by scaling down the switching
frequency to reduce the switching and gate driving losses.
The BL9342 is available in SOT23-6L package.
Features
4.2 V to 40 V operating input range
230uA operating quiescent current.
Low shutdown supply current
500mΩ internal power MOSFET
1.8 MHz fixed switching frequency
>90% efficiency
Internally compensated
Stable with ceramic output capacitors
Internal soft-start
Thermal shutdown function
Precision current limit without current sensing resistor
SOT23-6L package
Applications
High voltage power conversion
Industrial power systems
Power meter
Battery powered systems
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BL9342
Function Block Diagram
Package Reference
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BL9342
Typical Application Circuits
Absolute Maximum Ratings
Description
Value
Supply Voltage(VIN)
–0.3V to 43V
Switch Voltage (VSW)
–0.3V to VIN (MAX)+0.3V
BST to SW
-0.3 to 6.0V
All Other Pins
–0.3V to 5.0V
Continuous Power
Dissipation(TA=+25℃)
Junction Temperature
0.57W
Lead Temperature
260℃
Storage Temperature
-65°C to 150℃
150℃
Recommended Operating Conditions
Description
Value
Supply Voltage Vin
4.2V to 40V
Output Voltage VOUT
Up to 40V
Operating Junction
Temp(TJ)
–40℃ to +125℃
Thermal Resistance
SOT23-6L
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θJA θJC
220
110 ℃/W
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BL9342
Electrical Characteristics
Vin=12V, Ven=2V, Ta=25℃, unless otherwise noted。
Symbol
Parameter
Condition
Vfb
Feedback Voltage
Rsw
Upper Switch
Resistance
Iswleak
Upper Switch Leakage
Ilim
Current Limit
Gcs
Transconductance
Vin min
Minimum
Voltage
Vin(UVLO)
UVLO Up Threshold
Vin(UVLO)hys
UVLO Hysteresis
Tss
Soft-Start Time
Fosc
ON
Min
Typ
Max
Units
0.794
V
Vbst-Vsw=5V
500
mΩ
Ven=0V, Vsw=0V
0.1
COMP to SENSE
Operating
1
uA
1
A
3
A/V
4.2
V
3.3
4.2
V
0.8
V
0.5
msec
Oscillator Frequency
1.8
MHz
Ton min
Minimum Switch ON
Time
100
ns
Isd
Shutdown Current
Ven
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