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PDF BD95242MUV Data sheet ( Hoja de datos )
| Número de pieza | BD95242MUV | |
| Descripción | 2ch Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Hi-performance Regulator IC Series for PCs
2ch Switching Regulator
for Desktop PC
BD95242MUV
No.10030ECT14
●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 H3RegTM is a Rohm proprietary control method to realize ultra high
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.
●Features
1) 2ch H3RegTM Switching Regulator Controller
2) Adjustable Simple Light Load Mode (SLLM), Quiet Light Load Mode (QLLM) and Forced continuous Mode
3) Thermal Shut Down (TSD), Under Voltage Lock Out (UVLO), Over Current Protection (OCP),
Over Voltage Protection (OVP), Short circuit protection with timer-latch (SCP)
4) Soft start function to minimize rush current during startup
5) Switching Frequency Variable (f=200 kHz~500 kHz)
6) Power good circuit
7) 2ch linear regulator
8) VQFN032V5050 package
●Applications
Laptop PC, Desktop PC, LCD-TV, Digital Components
www.DataSheet.co.kr
●Maximum Absolute Ratings (Ta=25℃)
Parameter
Symbol
Limits
VIN, CTL
EXTVCC, PGOOD1, PGOOD2FB1, FB2, Is+1, Is+2, MCTL
30 *1*2
7 *1*2
FS1, FS2, REF1, REF2, SS1, SS2, LG1, LG2
REG1+0.3*1*2
BOOT1, BOOT2
35 *1*2
Terminal voltage
BOOT1-SW1, BOOT2-SW2, HG1-SW1, HG2-SW2
HG1
7 *1*2
BOOT1+0.3 *1*2
HG2
BOOT2+0.3 *1*2
EN1, EN2
6 *1*2
DGND, PGND1, PGND2
AGND±0.3 *1*2
Power dissipation 1
Power dissipation 2
Power dissipation 3
Power dissipation 4
Pd1 0.38 *3
Pd2 0.88 *4
Pd3 2.06 *5
Pd4 4.56 *6
Operating temperature range
Topr
-10 ~ +100
Storage temperature range
Tstg
-55 ~ +150
Junction Temperature
Tjmax
+150
*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
which has 1 layer. (Copper foil area: 0mm2))
*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
which has 4 layers. (1st and 4th copper foil area: 20.2mm2, 2nd and 3rd copper foil area: 5505mm2))
*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
which has 4 layers. (All copper foil area: 5505mm2))
Unit
V
V
V
V
V
V
V
V
V
W
W
W
W
℃
℃
℃
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/20
2010.03 - Rev.C
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
●Pin Configuration
Technical Note
24 23 22 21 20 19 18 17
PGND1 25
LG1 26
EXTVCC 27
REG2 28
REG1 29
VIN 30
LG2 31
PGND2 32
16 Is+1
15 FB1
14 FS1
13 AGND
FIN
12 MCTL
11 FS2
10 FB2
9 Is+2
12345678
●Pin Function Table
PIN No.
PIN name
1 SW2
2 HG2
3 BOOT2
4 EN2
5 PGOOD2
6 SS2
7 DGND
8 REF2
9 Is+2
10 FB2
11 FS2
12 MCTL
13 AGND
14 FS1
15 FB1
16 Is+1
17 REF1
18 CTL
19 SS1
20 PGOOD1
21 EN1
22 BOOT1
23 HG1
24 SW1
25 PGND1
26 LG1
27 EXTVCC
28 REG2
29 REG1
30 VIN
31 LG2
32 PGND2
reverse
FIN
PIN Function
Highside FET source pin 2
Highside FET gate drive pin 2
HG Driver power supply pin 2
Vo2 ON/OFF pin (High=ON, Low=OFF)
Vo2 Power Good Open Drain Output pin
Vo2 soft start pin
Ground
Vo2 output voltage setting pin www.DataSheet.co.kr
Current sense pin +2
Vo2 output voltage sense pin, current sense pin -2
Input pin for setting Vo2 frequency
Mode shift pin (Low=continuous, Middle=QLLM, High=SLLM)
Input pin Ground
Input pin for setting Vo1 frequency
Vo2 output voltage sense pin, current sense pin -1
Current sense pin +1
Vo1 output voltage setting pin
Linear regulator ON/OFF pin (High=ON, Low=OFF)
Vo1 soft start pin
Vo1 Power Good Open Drain Output pin
Vo1 ON/OFF pin (High=ON, Low=OFF)
HG Driver power supply pin 1
Highside FET gate drive pin 1
Highside FET source pin 1
Lowside FET source pin 1
Lowside FET gate drive pin 1
Outside power supply input pin
3.3V linear regulator output pin
5V linear regulator output pin
Power supply input pin
Lowside FET gate drive pin 2
Lowside FET source pin 2
Exposed Pad, Connect to GND
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/20
2010.03 - Rev.C
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Technical Note
● External Component Selection
1. Inductor (L) selection
VIN
IL
L
ΔIL
VOUT
Co
Output ripple current
The inductor value is a major influence on the output ripple
current. As formula (4) below indicates, the greater the inductor or
the switching frequency, the lower the ripple current.
(VIN-VOUT)×VOUT
ΔIL=
L×VIN×f
[A]・・・(4)
The proper output ripple current setting is about 30% of maximum
output current.
ΔIL=0.3×IOUTmax. [A]・・・(5)
(VIN-VOUT)×VOUT
L= ΔIL×VIN×f
[H]・・・(6)
(ΔIL: output ripple current; f: switch frequency)
※Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease
system efficiency. In selecting the inductor, be sure to allow enough margins to assure that peak current does not
exceed the inductor rated current value.
※To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance.
2.Output Capacitor (CO) Selection
VIN When determining the proper output capacitor, be sure to factor in the equivalent
series resistance required to smooth out ripple volume and maintain a stable
output voltage range.
VOUT Output ripple voltage is determined as in formula (7) below.
L ESR
Co CEXT
Load
Output Capacitor
ΔVOUT=ΔIL×ESR [V]・・・(7)
(ΔIL: Output ripple current; ESR: CO equivalent series resistance)
www.DataSheet.co.kr
※ In selecting a capacitor, make sure the capacitor rating allows sufficient
margin relative to output voltage. Note that a lower ESR can minimize output
ripple voltage.
Please give due consideration to the conditions in formula (8) below for output capacity, bear in mind that output rise time
must be established within the soft start time frame.
Co+CEXT≦ TSS×(Limit-IOUT)
VOUT
・・・(8)
Tss: Soft start time
Limit: Over current detection 2A(Typ.)
Note: Improper capacitor may cause startup malfunctions.
3. Input Capacitor (Cin) Selection
VIN
Cin
VOUT
L Co
Input Capacitor
The input capacitor selected must have low enough ESR resistance to fully
support large ripple output, in order to prevent extreme over current. The
formula for ripple current IRMS is given in (9) below.
IRMS=IOUT×
√VIN(VIN-VOUT)
VIN
Where VIN=2×VOUT, IRMS=
IOUT
2
[A]・・・(9)
A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/20
2010.03 - Rev.C
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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