Datasheet
2.7V to 5.5V, 3.0A 1ch
Synchronous Buck Converter with
Integrated FET
BD9132MUV
General Description
BD9132MUV 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
3.0A (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
SW
C
O
R
2
C
1
PVCC
VCC
C
BST
L
V
OUT
R
1
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
.
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○This
product has no designed protection against radioactive rays
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BD9132MUV
Pin Configuration
(TOP VIEW)
N.C.
ADJ
GND
ITH
15 14 13 12 11
N.C.
16
EN
10
9
8
7
6
1
2
3
SW
Figure 2. Pin Configuration
VCC
BST
17
18
PGND
19
20
4
5
PVCC
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
N.C.
N.C.
N.C.
EN
PGND
PGND
PGND
Function
Ground pin
Output voltage detection pin
GmAmp output pin/connected to phase
compensation capacitor
No connection
No connection
No connection
Enable pin(Active high）
Power switch ground pin
Power switch ground pin
Power switch ground pin
Block Diagram
VCC
PVCC
PV
CC
VCC
Figure 3. Block Diagram
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BD9132MUV
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)
Pd should not
(Note 2) IC only
(Note 3)
Mounted on a
(Note 4)
Mounted on a
(Note 5)
Mounted on a
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)
1.21
(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
be exceeded.
1-layer.74.2mmx74.2mmx1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm
2
4-layer 74.2mmx74.2mmx1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm
2
, in each layers
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. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over 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
(Note 6)
(Note 7)
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)
3.0
(Note 7)
Unit
V
V
V
V
A
In case the output voltage is set to 1.6V or more, V
CCMin
= V
OUT
+1.2V.
Pd should not be exceeded.
Electrical Characteristics
(Ta=25°C V
CC
=PV
CC
=3.3V, V
EN
=V
CC
, R
1
=10kΩ, R
2
=5kΩ, unless otherwise specified.)
Parameter
Standby Current
Active Current
EN Low Voltage
EN High Voltage
EN 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
Timer Latch Time
Output Short Circuit
Threshold Voltage
Symbol
I
STB
I
CC
V
ENL
V
ENH
I
EN
f
OSC
R
ONH
R
ONL
V
ADJ
I
THSI
I
THSO
V
UVLO1
V
UVLO2
t
SS
t
LATCH
V
SCP
Min
-
-
-
2.0
-
0.8
-
-
0.788
10
10
2.400
2.425
2.5
0.5
-
Typ
0
250
GND
V
CC
1
1
82
70
0.800
18
18
2.500
2.550
5
1
0.40
Max
10
500
0.8
-
10
1.2
115
98
0.812
-
-
2.600
2.700
10
2
0.56
Unit
µA
µA
V
V
µA
MHz
mΩ
mΩ
V
µA
µA
V
V
ms
ms
V
Conditions
EN=GND
Standby mode
Active mode
V
EN
=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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BD9132MUV
Typical Performance Curves
[V
OUT
=1.2V]
Output Voltage: V
OUT
[V]
Output Voltage: V
OUT
[V]
[V
OUT
=1.2V]
Ta=25°C
I
O
=3A
V
CC
=5V
Ta=25°C
I
O
=0A
Input Voltage: V
CC
[V]
Figure 4. Output Voltage vs Input Volatge
EN Voltage: V
EN
[V]
Figure 5. Output Voltage vs EN Voltage
[V
OUT
=1.2V]
Output Voltage: V
OUT
[V]
Output Voltage: V
OUT
[V]
[V
OUT
=1.2V]
V
CC
=5V
Ta=25°C
V
CC
=5V
I
O
=0A
Output Current: I
OUT
[A]
Figure 6. Output Voltage vs Output Current
Temperature: Ta[°C]
Figure 7. Output Voltage vs Temperature
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BD9132MUV
Typical Performance Curves - continued
V
OUT
=1.8
V
OUT
=1.5
V
OUT
=1.2
V
OUT
=1.0
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. 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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GD32 MCU
