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BD9137MUV Datasheet, PDF (1/17 Pages) Rohm – High Efficiency Step-down Switching Regulator | |||
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TECHNICAL NOTE
Single-chip built-in FET type Switching Regulator Series
High Efficiency
Step-down Switching Regulator
BD9137MUV
âDescription
ROHMâs high efficiency step-down switching regulator BD9137MUV is a power supply designed to produce a low voltage
including 0.8 volts from 5.5/3.3 volts power supply line. Offers high efficiency with our original pulse skip control technology
and synchronous rectifier. Employs a current mode control system to provide faster transient response to sudden change in
load.
âFeatures
1) Offers fast transient response with current mode PWM control system.
2) Offers highly efficiency for all load range with synchronous rectifier (Nch/Nch FET) and SLLM (Simple Light Load Mode)
3) Incorporates soft-start function.
4) Incorporates thermal protection and ULVO functions.
5) Incorporates short-current protection circuit with time delay function.
6) Incorporates shutdown function Icc=0μA(Typ.)
7) Employs small surface mount package : VQFN020V4040
âUse
Power supply for LSI including DSP, Micro computer and ASIC
âAbsolute Maximum Rating (Ta=25â)
Parameter
VCC Voltage
PVCC Voltage
Symbol
Limits
Unit
BD9137MUV
VCC
-0.3ï½+7 *1
V
PVCC
-0.3ï½+7 *1
V
BST Voltage
VBST
-0.3ï½+13
V
BST_SW Voltage
VBST-SW
-0.3ï½+7
V
EN Voltage
VEN
-0.3ï½+7
V
SW,ITH Voltage
Power Dissipation 1
Power Dissipation 2
Power Dissipation 3
Power Dissipation 4
VSW, VITH
-0.3ï½+7
V
Pd1
0.34 *2
W
Pd2
0.70 *3
W
Pd3
2.21 *4
W
Pd4
3.56 *5
W
Operating temperature range
Topr
-40ï½+105
â
Storage temperature range
Tstg
-55ï½+150
â
Maximum junction temperature
Tj
+150
â
ï¼1 Pd should not be exceeded.
ï¼2 IC only
ï¼3 1-layer. mounted on a 74.2mmÃ74.2mmÃ1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm2
ï¼4 4 layers, mounted on a board 74.2mmÃ74.2mmÃ1.6mm Glass-epoxy PCB (1st ,4th Copper foil area : 10.29mm2 2nd ,3rd Copper foil area : 5505mm2)
ï¼5 4-layer. mounted on a 74.2mmÃ74.2mmÃ1.6mm glass-epoxy board, occupied area by copper foil : 5505mm2, in each layers
âOperating Conditions (Ta=-40ï½+105â)
Parameter
Symbol
BD9137MUV
Min.
Typ.
Max.
Unit
Power Supply Voltage
VCC
2.7
3.3
5.5
V
PVCC
2.7
3.3
5.5
V
EN Voltage
VEN
0
-
5.5
V
Output voltage Setting Range
VOUT
0.8
-
3.3*6
V
SW average output current
ISW
-
-
4.0*7
A
ï¼6 In case set output voltage 1.6V or more, VccMin = Vout+1.2V.
ï¼7 Pd should not be exceeded.
Dec. 2008
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