BD95242MUV ROHM Electronics, BD95242MUV Datasheet

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BD95242MUV

Manufacturer Part Number
BD95242MUV
Description
2ch Switching Regurators for Desktop PC
Manufacturer
ROHM Electronics
Datasheet
1.BD95242MUV.pdf (21 pages)
Hi-performance Regurator IC Series for PCs
2ch Switching Regurators
for Desktop PC
●Description
●Features
●Applications
●Maximum Absolute Ratings (Ta=25℃)
© 2009 ROHM Co., Ltd. All rights reserved.
www.rohm.com
BD95242MUV
BD95242MUV is a switching regulator controller with high output current which can achieve low output voltage (2.0V～5.5V)
from a wide input voltage range (7V～25V). High efficiency for the switching regulator can be realized by utilizing an external
N-MOSFET power transistor. A new technology called H
transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency
in light load mode, providing high efficiency over a wide load range. For protection and ease of use, the soft start function,
variable frequency function, short circuit protection function with timer latch, over voltage protection with timer latch, and
Power good function are all built in. This switching regulator is specially designed for Main Power Supply.
Laptop PC, Desktop PC, LCD-TV, Digital Components
Terminal voltage
Power dissipation 1
Power dissipation 2
Power dissipation 3
Power dissipation 4
Operating temperature range
Storage temperature range
Junction Temperature
*1 Do not however exceed Pd.
*2 Instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle.
*3 Reduced by 3.0mW for each increase in Ta of 1℃ over 25℃ (when don’t mounted on a heat radiation board )
*4 Reduced by 7.0mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB
*5 Reduced by 16.5mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB
*6 Reduced by 36.5mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB
1) 2ch H
2) Adjustable Simple Light Load Mode (SLLM), Quiet Light Load Mode (QLLM) and Forced continuous Mode
3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP),
4) Soft start function to minimize rush current during startup
5) Switching Frequency Variable (f=200KHz～500KHz)
6) Power good circuit
7) 2ch Linear regulator
8) VQFN032V5050 package
which has 1 layer. (Copper foil area : 0mm
which has 4 layers. (1
which has 4 layers. (All copper foil area : 5505mm
Over Voltage Protection (OVP), Short circuit protection with timer-latch (SCP)
Parameter
3
Reg
TM
Switching Regulator Controller
st
and 4
th
copper foil area : 20.2mm
EXTVCC, PGOOD1, PGOOD2FB1, FB2, Is+1, Is+2, MCTL
2
))
BOOT1-SW1, BOOT2-SW2, HG1-SW1, HG2-SW2
FS1, FS2, REF1, REF2, SS1, SS2, LG1, LG2
2
))
2
, 2
nd
DGND, PGND1, PGND2
and 3
BOOT1, BOOT2
rd
1/20
EN1, EN2
3
copper foil area : 5505mm
VIN, CTL
Reg
Symbol
Tjmax
HG1
HG2
Topr
Pd1
Pd2
Pd3
Pd4
Tstg
TM
is a Rohm proprietary control method to realize ultra high
2
))
BOOT1+0.3 *
BOOT2+0.3 *
AGND±0.3 *
REG1+0.3*
-10～+100
-55～+150
30 *
35 *
0.38 *
0.88 *
2.06 *
4.56 *
Limits
7 *
7 *
6 *
+150
2009.04 - Rev.B
1
1
1
1
1
*
*
*
*
*
No.09030EBT14
2
2
2
2
2
3
4
5
6
1
*
1
1
1
2
*
*
*
2
2
2
Unit
W
W
W
W
℃
℃
℃
V
V
V
V
V
V
V
V
V

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BD95242MUV Summary of contents

Page 1

... Desktop PC BD95242MUV ●Description BD95242MUV is a switching regulator controller with high output current which can achieve low output voltage (2.0V～5.5V) from a wide input voltage range (7V～25V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H transient response against load change ...

Page 2

Conditions (Ta=25℃) Parameter Terminal voltage BOOT1-SW1, BOOT2-SW2, HG1-SW1, HG2-SW2 *This product should not be used in a radioactive environment. ●Electrical characteristics (unless otherwise noted, Ta=25℃ VIN=12V, CTL=5V, EN1=EN2=5V, REF1=2.5V, REF2=1.65V, FS1=FS2=0.582V) Parameter VIN standby current VIN bias current Shut ...

Page 3

Continued (unless otherwise noted, Ta=25℃ VIN=12V, CTL=5V, EN1=EN2=5V, REF1=2.5V, REF2=1.65V, FS1=FS2=0.582V) Parameter 3 [H REG block] On Time 1 On Time 2 Maximum On Time Minimum Off Time FS1, FS2 bias current [FET driver block] HG higher ...

Page 4

Diagram, Application circuit FS2 11 FB2 10 REF2 REG2 8 5 PGOOD2 REG2 Is+2 9 EN2 4 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved REG1 CL2 Overlap SCP2 Protection Circuit ...

Page 5

Configuration PGND1 EXTVCC REG2 REG1 PGND2 ●Pin Function Table PIN No. PIN name 1 SW2 Highside FET source pin 2 2 HG2 Highside FET gate drive pin 2 3 BOOT2 HG Driver power supply pin 2 4 EN2 Vo2 ...

Page 6

EN 5V/div PGOOD 5V/div SS 1V/div Vo 2V/div Fig.1 wake up (Vo=5.0V) Vo 20mV/div I L 2A/div SW 5V/div LG 5V/div Fig.4 CONT Mode (Io=0A) Vo 20mV/div I L 2A/div SW 5V/div LG 5V/div Fig.7 QLLM (Io=0A) Vo ...

Page 7

Continued 1.5 1.0 Vo=5.0V 0.5 Vo=3.3V 0.0 0.00 0.40 0.80 1.20 FS[V] Fig.13 FS-ON TIME 100 90 SLLM QLLM 40 30 CONT Mode 100 1000 Io [mA] Fig.16 ...

Page 8

Descriptions ・VIN This is the main power supply pin. The input supply voltage range 25V. The duty cycle of BD9524MUV is determined by input voltage and control output voltage. Therefore, when VIN voltage fluctuated, the output ...

Page 9

... Explanation of Operation The BD95242MUV is a 2ch synchronous buck regulator controller incorporating ROHM’s proprietary H control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. Thus, it serves to improve the regulator’s transient response. Activating the Light Load Mode will also exercise Simple Light Load Mode (SLLM) control when the load is light, to further increase efficiency ...

Page 10

Chart • Soft Start Function OUT I IN ・Timer Latch Type Short Circuit Protection REF×1.4 V OUT SCP EN / UVLO ・Over Voltage Protection 150μs(typ) 150μs(typ) or less or more REF×2.35 VOUT 150μs(typ) OVP ...

Page 11

External Component Selection 1. Inductor (L) selection Δ OUT L Co Output ripple current ※Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease system ...

Page 12

MOSFET Selection VIN main switch VOUT L Co synchronous switch 5. Setting Detection Resistance (Detect ILIMIT at the peak current) (A) High accuracy current detective circuit (use the low resistance) VIN L R VOUT IL Co OCP 65mV Current ...

Page 13

Setting standard voltage (REF) V REF 3 H Reg CONTROLLA Outside voltage REG2(3.3V) R1 REF H CONTROLLA Setting output voltage This IC is operated that output voltage is REF×2≒FB. And it ...

Page 14

Equivalent Circuit 1, 24pin (SW2, SW1) BOOT HG 4, 21pin (EN2, EN1) 8, 17pin (REF2, REF1) REG1 11, 14pin (FS2, FS1) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2, 23pin (HG2, HG1) BOOT BOOT SW 5, 20pin ...

Page 15

Equivalent Circuit 26, 31pin (LG1, LG2) REG1 REG1 29pin (REG1) VIN ●Evaluation Board Circuit (Vo1=5V f1=300kHz Vo2=3.3V f2=400kHz) VIN BD9524MUV 12V R1 30 VIN CTL VIN C1 R2 CTL 18 CTL REG1 EN1 EN1 R3 21 EN1 REG1 EN2 ...

Page 16

DESIGNATION RATING PART No. R1 0Ω MCR03EZHJ000 R2 0Ω MCR03EZHJ000 R3 0Ω MCR03EZHJ000 R4 0Ω MCR03EZHJ000 R5 0Ω MCR03EZHJ000 R6 15kΩ MCR03PZHZF1502 R7 47kΩ MCR03PZHZF4702 R8 30kΩ MCR03PZHZF3002 R9 30kΩ MCR03PZHZF3002 R10 * - R11 * - R12 - R13 ...

Page 17

... If using only 1ch DC/DC and 2ch pin is set to be off at all times, please manage the unused pin as diagram below. PIN No, PIN Name 1 SW2 2 HG2 3 BOOT2 4 EN2 5 PGOOD2 6 SS2 8 REF2 9 Is+2 10 FB2 11 FS2 31 LG2 VIN BD95242MUV 12V R1 30 VIN CTL VIN C1 R2 CTL 18 CTL REG1 EN1 EN1 R3 21 EN1 4 EN2 REG1 29 REG1 5V C2 REG2 3 ...

Page 18

Notes and Precautions 1. This integrated circuit is a monolithic IC, which (as shown in the figure below), has P isolation in the P substrate and between the various pins. A P-N junction is formed from this P layer ...

Page 19

Operation in strong electromagnetic fields Use in strong electromagnetic fields may cause malfunctions. Use extreme caution with electromagnetic fields. 8. Thermal shutdown circuit This IC is provided with a built-in thermal shutdown (TSD) circuit, which is activated when the ...

Page 20

Part No. Part No. VQFN032V5050 5.0±0.1 1PIN MARK S 0.08 S 3.4±0.1 C0 0.75 +0.05 0.5 0.25 -0.04 www.rohm.com © 2009 ROHM Co., Ltd. All ...

Page 21

No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose ...

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