Datasheet
5.5V to 28V Input,
2ch Synchronous Buck DC/DC Controller
BD9528AMUV
General Description
BD9528AMUV is a dual buck regulator controller with
adjustable output voltage from1.0V to 5.5V and an input
voltage range of 5.5 to 28V. High efficiency is achieved
with an external synchronous Nch-MOSFET. H
3
Reg
TM
,
Rohm’s advanced proprietary control method that uses
constant on-time control to provide ultra high transient
responses to load changes is used. SLLM(Simple Light
Load Mode) technology is added to improve efficiency
with light loads giving high efficiency over a wide load
range. In addition to the dual buck regulator controllers,
here are 2 LDO regulators included that are fixed output
voltage of 3.3V and 5.0V. Other functions included are
soft start, variable frequency, short circuit protection with
timer latch, over voltage, and power good outputs. This
buck regulator is optimal for high-current applications.
Applications
Industrial Equipment ,FPGA, POL Power Supply,
Mobile PC, Desktop PC, LCD-TV,
Digital Components, etc.
Key Specifications
Input Voltage Range:
5.5V to 28V
Output Voltage Range:
1.0V to 5.5V
Switching Frequency:
200k to 500kHz(Typ)
Operating Temperature Range: -20°C to +100°C
W(Typ) x D(Typ) x H(Max)
5.00mm x 5.00mm x 1.00mm
Package
VQFN032V5050
Features
Adjustable Simple Light Load Mode (SLLM), Quiet
light Load Mode (QLLM), Forced continuous Mode.
Multifunctional Protection Circuit
-Settable Over Current Protection (OCP)
-Thermal Shut down (TSD)
-Under Voltage Lock Out (UVLO)
-Over Voltage Protection (OVP)
-Short Circuit Protection with Timer-Latch (SCP)
150kHz to 500kHz Switching frequency.
Adjustable Soft Start.
Power Good.
Dual Linear Regulator (5V/3.3V (total 100mA)).
Output Discharge.
Reference voltage Circuit (0.7V).
Boot diode
VQFN032V5050
○Product
structure : Silicon monolithic integrated circuit
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© 2015 ROHM Co., Ltd. All rights reserved.
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○This
product has no designed protection against radioactive rays
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BD9528AMUV
Typical Application Circuit
R16
R15
R26
R25
R7
16
MCTL2
15
FS1
14
FB1
13
AGND
C4
12
REF
11
FB2
R8
10
FS2
9
CTL
R5
R6
ILIM2
8
17
ILIM1
18
MCTL1
C5
VO2
7
C6
19
SS1
20
PGOOD1
U1
U1
EN_3.3
SS2
6
PGOOD2
5
BD95602MUV
BD9528AMUV
21
EN1
22
BOOT1
C9
C7
Q1
EN2
4
EN_2.5
C8
23
HG1
PGND1
HG2
2
L1
REG2
REG1
Q3
C12
BOOT2
3
L2
VO1
LG1
LG2
VIN
C29
3.3V
C19
24
SW1
PGND2
SW2
1
2.5V
25
Q2
26
27
28
29
30
31
32
Q4
C3
C2
C1
GND PGND
REG2_3.3V
REG1_5V
+12V
Figure 1. Application Circuit
Pin Configuration
PGOOD1
BOOT1
MCTL1
18
24
PGND1 25
LG1 26
Vo1 27
REG2 28
REG1 29
VIN 30
LG2 31
PGND2 32
1
23
22
21
20
19
17
16 MCTL2
15 FS1
14 FB1
ILIM1
13 AGND
12 REF
11 FB2
10 FS2
9 CTL
8
SW1
HG1
EN1
FIN
2
3
4
5
SS1
6
7
SW2
EN2
SS2
HG2
Vo2
BOOT2
Figure 2. Pin Configuration
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PGOOD2
ILIM2
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BD9528AMUV
Pin Descriptions
Pin No.
1
24
2
23
3
22
4
21
5
20
6
19
7
27
8
17
Pin Name
SW2
SW1
HG2
HG1
BOOT2
BOOT1
EN2
EN1
PGOOD2
PGOOD1
SS2
SS1
VO2
VO1
ILIM2
ILIM1
Function
Ground pin for High-side FET. The maximum voltage range of this pin is 30V.
High-side FET gate drive pin.
This is the power supply pin for High-side FET driver. The maximum voltage range to
ground is to 35V, to SW pin is to 7V. In switching operations, the voltage swings from
(VIN+REG1) to REG1 by BOOT pin operation.
When EN pin voltage is at least 2.3V, the status of the switching regulator becomes active.
Conversely, the status switches off when EN pin voltage goes lower than 0.8V.
This pin is pulled down to AGND with 1MΩ resistor.
If FB pin voltage is 15% or less of reference voltage, it will output low level.
The output format is open drain, so please connect pull-up resistance.
This is the setting pin for soft start. The rising time is determined by the capacitor connected
between SS and ground, and the fixed current inside IC after it is the status of low in standby
mode. It controls the output voltage till SS voltage catch up the REF pin to become the SS
terminal voltage.
This is the output discharge pin, and output voltage feedback pin for frequency setting.
This is the coil current limit setting pin. Set the resistor which is connected in between ground.
When CTL pin voltage is at least 2.3V, the status of the linear regulator REG1 and REG2
output becomes active. Conversely, the status switches off when CTL pin voltage goes lower
than 0.8V. The switching regulator doesn’t become active when the status of CTL pin is low, if
the status of EN pin is high.
This pin is pulled up to VIN with 1MΩ resistor.
Frequency input. A resistor to ground will set the switching frequency.
Frequencies from 150kHz to 500kHz are possible.
This is the output voltage feedback pin.
The IC controls reference voltage and FB terminal voltage are almost same.
This is the output voltage setting pin.
The IC controls reference voltage and FB terminal voltage are almost same.
Ground input for control circuit.
This is the operation mode setting pin. If terminal voltage reaches less than 0.8V, it will be Low
Level.
If terminal voltage reaches more than 2.3V, it will be High Level. This pin is pulled down to
AGND with 300kΩ resistor.
Input
Control Mode
MCTL1
MCTL2
Low
Low
High
High
25
32
26
31
28
29
PGND1
PGND2
LG1
LG2
REG2
REG1
Low
High
Low
High
SLLM
QLLM
Continuous PWM Mode
Continuous PWM Mode
9
CTL
10
15
11
14
12
13
FS2
FS1
FB2
FB1
REF
AGND
16
18
MCTL2
MCTL1
This is the ground pin for Low-side FET drive.
This is the Low-side FET gate drive pin. It is operated in switching between REG1 to PGND.
ON resistance of output stage when High, it is 2Ω and when Low, it is 0.5Ω drive
Low-side FET gate with the high pace.
This is the output pin for 3.3V/50mA linear regulator (5V/3.3V (total 100mA)).
Please connect 10µF capacitor which characteristic is more than X5R near the pin.
This is the output pin for 5V/50mA linear regulator (5V/3.3V (total 100mA)).
Please connect 10µF capacitor which characteristic is more than X5R near the pin.
Supply pin of H
3
Reg
TM
control circuit and linear regulator. Monitor input voltage and determine
necessary on-time. As a result, this terminal voltage changes, and then the IC operation
become unstable. Please connect 10µF capacitor which characteristic is more than X5R near
the pin.
This is the thermal PAD. Please connect to the ground.
30
FIN
VIN
FIN
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BD9528AMUV
Output condition table
Input
CTL
Low
Low
Low
Low
High
High
High
High
EN1
Low
Low
High
High
Low
Low
High
High
EN2
Low
High
Low
High
Low
High
Low
High
REG1(5V)
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Output
REG2(3.3V)
DC/DC1
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
DC/DC2
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
*
CTL pin is connected to VIN pin with 1MΩ resistor(pull up) internal IC.
*
EN pin is connected to AGND pin with 1MΩ resistor(pull down) internal IC.
Block Diagram
Vo2
Adjustable
Vo1
Adjustable
BOOT2
VIN
BOOT1
VIN
PGND2
3
2
1
31
REG1
32
REG1
22
23
24
26
PGND1
SW2
SW1
HG2
LG2
HG1
LG1
25
REG1
REG1
AGND
Short through
Protection
Circuit
SLLM
TM
Block
Over Voltage Protect
Short Circuit Protect
CL2
SCP2
OVP2
Short through
Protection
Circuit
SLLM
TM
Block
CL1
SCP1
OVP1
13
FS2
10
SCP2
REG1
FS1
15
SCP1
RFS1
MCTL
MCTL
5
Short Circuit Protect
Power Good
20
PGOOD1
Power Good
PGOOD2
Over Voltage Protect
OVP2
Timer
Timer
Timer
FS2
FS1
EN2
TSD
EN1
UVLO
Timer
H
3
Reg
TM
Controller
Block
H
3
Reg
TM
Controller
Block
OVP1
FB2
REF
FB1
REF
11
6
SS2
Over Current
Protect
CL2
Thermal
Protection
14
REF
12
SS1
19
Over Current
Protect
CL1
ILIM2
REF
ILIM1
17
PGND1
SW1
8
SW2
PGND2
MCTL
EN2
4
Vo1
5V
Reg
3.3V
Reg
SLLM Mode Control
Reference
Block
REG1
EN1
21
MCTL1
MCTL2
Vo2
VIN
CTL
REG1
5.5½28V
REG1
VIN
REG2
REG2
Figure 3. Block Diagram
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3.3V
5V
Vo1
7
9
30
29
28
18
16
27
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REG1
BD9528AMUV
Absolute Maximum Ratings(Ta = 25°C)
Parameter
Symbol
VIN, CTL, SW1, SW2
EN1, EN2, PGOOD1, PGOOD2
Vo1, Vo2, MCTL1, MCTL2
FS1, FS2, FB1, FB2, ILIM1, ILIM2,
SS1, SS2, LG1, LG2, REF,REG2
Terminal Voltage
BOOT1, BOOT2
BOOT1-SW1, BOOT2-SW2,
HG1-SW1, HG2-SW2
HG1
HG2
PGND1, PGND2
Power Dissipation1
Power Dissipation2
Power Dissipation3
Power Dissipation4
Operating Temperature Range
Storage Temperature Range
Rating
30
6
REG1+0.3
35
7
BOOT1+0.3
BOOT2+0.3
AGND±0.3
0.38
0.88
3.26
4.56
-20 to +100
-55 to +150
+150
Unit
V
V
V
V
V
V
V
V
W
W
W
W
°C
°C
°C
Conditions
Note 1
Note 1, Note 2
Note 1
Note 1, Note 2
Note 1, Note 2
Note 1, Note 2
Note 1, Note 2
Note 1, Note 2
Note 3
Note 4
Note 5
Note 6
Pd1
Pd2
Pd3
Pd4
Topr
Tstg
Tjmax
Junction Temperature
(Note 1) Not to exceed Pd.
(Note 2) Instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle.
(Note 3) Derating in done 3.0 mW/°C for operating above Ta
≥
25°C (when don’t mounted on a heat radiation board).
(Note 4) Derating in done 7.0 mW/°C for operating above Ta
≥
25°C (Mount on 1-layer 74.2mm x 74.2mm x 1.6mm board).
Surface heat dissipation copper foil:20.2mm
2
.
(Note 5) Derating in done 26.1 mW/°C for operating above Ta
≥
25°C (Mount on 4-layer 74.2mm x 74.2mm x 1.6mm board
Two sides heat dissipation copperfoil:20.2mm
2
. 2 or 3-layer : heat dissipation copper foil : 5505mm
2
).
(Note 6) Derating in done 36.5 mW/°C for operating above Ta
≥
25°C (Mount on 4-layer 74.2mm x 74.2mm x 1.6mm board)
All layers heat dissipation copper foil:5505mm
2
.
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=25
°C
)
Parameter
Symbol
VIN
CTL
EN1, EN2, MCTL1, MCTL2
Terminal Voltage
BOOT1, BOOT2
SW1, SW2
BOOT1-SW1, BOOT2-SW2,
HG1-SW1, HG2-SW2
Vo1, Vo2, PGOOD1, PGOOD2
Minimum ON Time
Soft Start time
T
ONMIN
Tss_max
Min
5.5
-0.3
-0.3
4.5
-0.3
-0.3
-0.3
-
-
Typ
-
-
-
-
-
-
-
-
-
Max
28
28
5.5
33
28
5.5
5.5
150
100
Unit
V
V
V
V
V
V
V
nsec
ms
Conditions
This product should not be used in a radioactive environment.
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TSZ02201-0A1A0A900160-1-1
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