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PDF BD91501MUV Data sheet ( Hoja de datos )

Número de pieza BD91501MUV
Descripción 2.55V/0.4A 1.8V/0.3A Output 2ch Synchronous Buck Converter Integrated FET
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
2.55V/0.4A 1.8V/0.3A Output 2ch
Synchronous Buck Converter
Integrated FET
BD91501MUV
Description
ROHM’s buck converter BD91501MUV is a 2ch output
power supply designed to produce a low voltage
including 2.55V/0.4A and 1.8V/0.3A from 3.3V 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.
Features
Offers fast transient response with current mode
PWM control system.
Offers highly efficiency for all load range with
synchronous rectifier (Pch/Nch FET) and SLLMTM
(Simple Light Load Mode)
Incorporates soft start function
Incorporates thermal protection and UVLO function
Incorporates short-current protection with timer
latch
Incorporates shutdown function Icc=0µA (Typ.)
Full 100% Duty function
2ch output power supply (2.55V, 1.8V)
2ch output ON/OFF individual control
Employs small surface mount package:
VQFN016V3030
Usage
Power supply for LSI including DSP, DDR(RAM), Micro
computer and ASIC
Key Specifications
Input voltage range:
Output volatage:
Output voltage accuracy
Switching frequency:
Low Voltage Detection:
Maximum on duty:
Operating temperature range:
2.55V to 5.5V
1.8V,2.55V
±1.5%
1.65MHz±20%
50%(Typ.)
100%
-30to +105
Package
VQFN016V3030:
(Typ.) (Typ.) (Max.)
3.00mm × 3.00 × 1.00mm
VQFN016V3030
Typical Application Circuit
VIN
Enable1
Enable2
AVCC
PVCC1
PVCC2
BD91501MUV
EN1
EN2
SW1
FB1
SW2
FB2
L1
L2
VOUT1
VOUT2
Figure.1 Typical Application Circuit
Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays.
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
1/22
TSZ02201-0J3J0A900260-1-2
31.Aug.2012 Rev.001

1 page




BD91501MUV pdf
BD91501MUV
Datasheet
11.8.865
[VOUT2=1.8V setting]
11.8.832
11..789
11.7.776
VCC=3.3V
Io=0A
11.7.743
1.711.7
-40 -20 0 20 40 60 80 100
-40 -20 0 20 40 60 80 100
Ta[]
Ta[]
Figure.8 Ta-VOUT2
110000
9900
8800
7700
6600
5500
4400
3300
2200
1100
00
1100
[VOUT1=2.55V]
[VOUT2=1.8V setting]
VCC=3.3V
Ta=25
110000
Io[m A]
Io[mA]
Figure.9 Efficiency
11000000
22
1.91.9
1.81.8
1.71.7
1.61.6 VCC=3.3V
1.51.5
1.41.4
1.31.3
-4-400 -2-200 00 2200 4400 660 0 880 0 11000 0
TTa「a[]]
Figure.10 Ta-Fosc
11..88
11..77
11..66
Ta=25
11..55
11..44
11..33
2.25.555
3.30.055
33.5.555
44.0.055
Vcc[V]
44..5555
55..0055
5.50
Figure.11 VCC-Fosc
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/22
TSZ02201-0J3J0A900260-1-2
31.Aug.2012 Rev.001

5 Page





BD91501MUV arduino
BD91501MUV
Datasheet
100% Duty control
Maximum Duty is 100% (Pch MOSFET is always ON). If output voltage cannot keep steady because of input voltage
drop for normal PWM control, oscillation frequency gets low, and becomes 100% Duty finally. Output voltage value is the
dropped value of Pch MOSFET’s ON voltage so that even low input voltage can keep output voltage.
VOUT
SENSE
Level
Shift
gm Amp.
Current
Comparator
RESET
RQ
FB SET S
ITH OSC
Driver
Logic
IL
SW
Load
VOUT
Figure.27 Current mode PWM control block diagram
Current
Comparator
SET
PVCC
SENSE
Current
Comparator
FB
GND
SET
PVCC
SENSE
FB
GND
RESET
SW
IL
GND
GND
IL(AVE)
VOUT
VOUT(AVE)
Figure.28 PWM Switching timing chart
RESET
SW
IL
VOUT
No switching
Figure.29 SLLMTM Switching timing chart
GND
GND
0A
VOUT(AVE)
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/22
TSZ02201-0J3J0A900260-1-2
31.Aug.2012 Rev.001

11 Page







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