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03W209A
2ch switching regulator controller
BD9851EFV
Description BD9851EFV is a 2 channel DC/DC switching regulator controller. Switching of step-down and step-up for channel1 can be managed by setting pin. Channel 2 is available for step-down and inversion, suitable for various applications. This IC is available for 3MHz of switching frequency by high-speed driver technology and provides power configuration with space saving. Dimension (Unit : mm)
7.8 0.1
24 13
4 +6 -4 0.53 0.15 1 0.2 0.17 +0.05 +0.03 0.08 S
+0.05 -0.04
7.6 0.2 5.6 0.1
1
0.325 1.0Max. 0.85 0.05 0.08 0.05 0.08 0.05
12
0.65
0.2
0.08 M
Features 1) Built-in 2 channels for switching of step-down/step-up and step-down/inversion 2) FET (Nch/Pch) direct drive 3) 3MHz switching frequency available (Variable externally) 4) Power package of HTSSOP-B20 5) Built-in standby function
HTSSOP-B20
Applications TFT panel, TA/router, digital household appliances
Absolute Maximum Ratings (Ta=25C)
Parameter Power supply voltage Power dissipation Operating temperature range Storage temperature range
*Derating : 8.0mW/C for operation above Ta=25C
Symbol Vcc Pd Topr Tstg -40 -55
Limits 20 1000 ~ ~
Unit V mW +85 +150
C C
Recommended Operating Conditions (Ta=25C)
Parameter Power supply voltage Oscillating frequency Symbol VCC fOSC Min. 4 10 Typ. 12 300 Max. 18 3000 Unit V kHz
February, 2004
Electrical characteristics (Unless otherwise noted: Ta=25C, Vcc=12V)
Parameter VREF output voltage Oscillating frequency Error amplifier threshold voltage Gate drive ON resistance Low current consumption Symbol VREF fosc VINV RON Icc Min. 2.475 270 0.98 Typ. 2.500 300 1.00 2.5 2.5 Max. 2.525 330 1.02 Unit V kHz V mA STB=3V Conditions IO=-0.1mA RT=24k, CT=220pF
Application Circuit
VCC VCC
18
VREF
17
VREF (2.5V)
Both CH ON/OFF
19 STB
FB1 VOUT1
15 1 SEL1
VCC
12
PVCC1
INV1
16
OUT1
11
VREF DTC1
13
1V
VOUT1
FB2 VOUT2
10
2.3V
PGND
6
VCC PVCC2 VREF INV2
5 8
NON2 VREF
4
9
DTC2
OUT2 VOUT2
7
RT CT
2
OSC
3
SCP
14
Timer Latch
GND
20
BD9851EFV
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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