Datasheet
2.7V to 5.5V, 4A 1ch
Synchronous Buck Converter with
Integrated FET
BD9137MUV
General Description
BD9137MUV is ROHM’s high efficiency step-down
switching regulator designed to produce a voltage as
low as 0.8V from a supply voltage of 5.5V/3.3V. It
offers high efficiency by using pulse skip control
technology and synchronous switches, and provides
fast transient response to sudden load changes by
implementing current mode control.
Key Specifications
Input Voltage Range:
Output Voltage Range:
Output Current:
Switching Frequency:
High Side FET ON-Resistance:
Low Side FET ON-Resistance:
Standby Current:
Operating Temperature Range:
2.7V to 5.5V
0.8V to 3.3V
4.0A (Max)
1MHz(Typ)
82mΩ(Typ)
70mΩ(Typ)
0µA (Typ)
-40°C to +105°C
Features
Fast Transient Response because of Current Mode
PWM Control System.
High Efficiency for All Load Ranges because of
Synchronous Switches (Nch/Nch FET) and SLLM
TM
(Simple Light Load Mode)
Soft-Start Function
Thermal Shutdown and UVLO Functions
Short-Circuit Protection with Time Delay Function
Shutdown Function
Package
W(Typ) x D(Typ) x H(Max)
Applications
Power Supply for LSI including DSP, Microcomputer
and ASIC
VQFN020V4040
4.00mm x 4.00mm x 1.00mm
Typical Application Circuit
R
f
V
CC
C
IN
EN
ADJ
ITH
R
ITH
C
ITH
GND, PGND
C
1
PVCC
VCC
C
BST
L
SW
C
O
R
2
V
OUT
R
1
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
.
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© 2012 ROHM Co., Ltd. All rights reserved.
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〇This
product has no designed protection against radioactive rays
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BD9137MUV
Pin Configuration
TP.1
(TOP VIEW)
15 14 13 12 11
PWM
GND
ADJ
ITH
TP.2
16
EN
17
18
10
VCC
9
8
7
6
1
2
3
4
5
BST
PGND
19
20
PVCC
Figure 2. Pin Configuration
SW
Pin Description
Pin
No.
1
2
3
4
5
6
7
8
9
10
Pin
Name
SW
SW
SW
SW
SW
PVCC
PVCC
PVCC
BST
VCC
Function
Power switch node
Power switch node
Power switch node
Power switch node
Power switch node
Power switch supply pin
Power switch supply pin
Power switch supply pin
Bootstrapped voltage input pin
Power supply input pin
Pin
No.
11
12
13
14
15
16
17
18
19
20
Pin
Name
GND
ADJ
ITH
PWM
TP.1
TP.2
EN
PGND
PGND
PGND
Function
Ground pin
Output voltage detection pin
GmAmp output pin/connected to phase
compensation capacitor
Select SLLM / PWM
(H:PWM mode , L:SLLM & PWM mode)
Test pin(connect to GND)
Test pin(connect to GND)
Enable pin(Active high）
Power switch ground pin
Power switch ground pin
Power switch ground pin
Block Diagram
EN
VREF
Current
Comp
+
Gm Amp
+
Soft
Start
R Q
S
Current
Sense/
Protect
+
SW
Driver
Logic
PV
CC
Output
VCC
BST
PVCC
3.3V
Input
SLOPE
CLK
OSC
VCC
UVLO
TSD
SCP
SLLM
select
PWM
GND
ADJ
ITH
R
ITH
C
ITH
R
1
R
2
Figure 3. Block Diagram
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BD9137MUV
Absolute Maximum Ratings
(Ta=25°C)
Parameter
VCC Voltage
PVCC Voltage
BST Voltage
BST_SW Voltage
EN Voltage
SW,ITH Voltage
Power Dissipation 1
Power Dissipation 2
Power Dissipation 3
Power Dissipation 4
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
(
Note 1)
Symbol
V
CC
PV
CC
V
BST
V
BST-SW
V
EN
V
SW
, V
ITH
Pd1
Pd2
Pd3
Pd4
Topr
Tstg
Tjmax
Limit
-0.3 to +7
(Note 1)
-0.3 to +7
(Note 1)
-0.3 to +13
-0.3 to +7
-0.3 to +7
-0.3 to +7
0.34
(Note 2)
0.70
(Note 3)
2.21
(Note 4)
3.56
(Note 5)
-40 to +105
-55 to +150
+150
Unit
V
V
V
V
V
V
W
W
W
W
°C
°C
°C
Pd should not be exceeded.
(Note 2) IC only
(Note 3) Mounted on a 1-layer 74.2mmx74.2mmx1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm
2
(Note 4) Mounted on a 4 layer 74.2mmx74.2mmx1.6mm Glass-epoxy PCB (1
st
,4
th
Copper foil area : 10.29mm
2
2
nd
,3
rd
Copper foil area : 5505mm
2
)
(Note 5) Mounted on a 4-layer 74.2mmx74.2mmx1.6mm glass-epoxy board, occupied area by copper foil : 5505mm
2
, in each layers
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as
short-circuit modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a
special mode exceeding the absolute maximum ratings.
Recommended Operating Conditions
(Ta=-40°C to +105°C)
Parameter
Power Supply Voltage
EN Voltage
Output Voltage Setting Range
SW Average Output Current
Symbol
V
CC
PV
CC
V
EN
V
OUT
I
SW
Min
2.7
2.7
0
0.8
-
Typ
3.3
3.3
-
-
-
Max
5.5
5.5
5.5
3.3
(Note 6)
4.0
(Note 7)
Unit
V
V
V
V
A
(
Note 6) In case the output voltage is set to 1.6V or more, V
CCMin
= V
OUT
+1.2V.
(
Note 7) Pd should not be exceeded.
Electrical Characteristics
(Unless otherwise specified Ta=25°C V
CC
=PV
CC
=3.3V, V
EN
=V
CC
, R
1
=10kΩ, R
2
=5kΩ)
Parameter
Standby Current
Active Current
EN Low Voltage
EN High Voltage
EN Input Current
PWM Low Voltage
PWM High Voltage
PWM Input Current
Oscillation Frequency
High Side FET ON-Resistance
Low Side FET ON-Resistance
ADJ Voltage
ITH S
I
nk Current
ITH Source Current
UVLO Threshold Voltage
UVLO Release Voltage
Soft-Start Time
Hiccup Delay
Cool Down Time
Output Short Circuit
Threshold Voltage
Symbol
I
STB
I
CC
V
ENL
V
ENH
I
EN
V
PWML
V
PWMH
I
PWM
f
OSC
R
ONH
R
ONL
V
ADJ
I
THSI
I
THSO
V
UVLO1
V
UVLO2
t
SS
t
HP
t
CD
V
SCP
Min
-
-
-
2.0
-
-
2.0
-
0.8
-
-
0.788
10
10
2.400
2.425
0.5
0.5
8
-
Typ
0
250
GND
V
CC
2
GND
V
CC
2
1
82
70
0.800
18
18
2.500
2.550
1
1
16
0.40
Max
10
500
0.8
-
10
0.8
-
10
1.2
115
98
0.812
-
-
2.600
2.700
2
2
32
0.56
Unit
µA
µA
V
V
µA
V
V
µA
MHz
mΩ
mΩ
V
µA
µA
V
V
ms
ms
ms
V
Conditions
EN=GND
Standby mode
Active mode
V
EN
=3.3V
SLLM & PWM mode
PWM mode
V
PWM
=3.3V
PV
CC
=3.3V
PV
CC
=3.3V
V
ADJ
=1V
V
ADJ
=0.6V
V
CC
=3.3V to 0V
V
CC
=0V to 3.3V
V
ADJ
=0.8V to 0V
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BD9137MUV
Typical Performance Curves
[V
OUT
=1.2V]
[V
OUT
=1.2V]
Output Voltage: V
OUT
[V]
Output Voltage: V
OUT
[V]
Ta=25°C
I
O
=3A
V
CC
=5V
Ta=25°C
I
O
=0A
Input Voltage: V
CC
[V]
EN Voltage: V
EN
[V]
Figure 5. Output Voltage vs EN Voltage
Figure 4. Output Voltage vs Input Voltage
[V
OUT
=1.2V]
[V
OUT
=1.2V]
Output Voltage: V
OUT
[V]
VV
CC
=5V
CC
Ta=25°C
Output Voltage: V
OUT
[V]
V
CC
V
CC
=5V
I
O
=0A
Output Current: I
OUT
[A]
Temperature: Ta[°C]
Figure 6. Output Voltage vs Output Current
Figure 7. Output Voltage vs Temperature
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BD9137MUV
Typical Performance Curves – continued
[V
OUT
=1.2V]
V
CC
=5V
Ta=25°C
Frequency: f
OSC
[MHz]
Efficiency: η [%]
V
CC=
5V
Output Current: I
OUT
[mA]
Figure 8. Efficiency vs Output Current
Temperature: Ta[°C]
Figure 9. Oscillation Frequency vs
Temperature
ON-Resistance: R
ON
[Ω]
EN Voltage: V
EN
[V]
V
CC
=3.3V
V
CC
=5V
Temperature: Ta[°C]
Figure 10. ON-Resistance vs
Temperature
Temperature: Ta[°C]
Figure 11. EN Voltage vs
Temperature
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