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BD8151EFV-E2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
1/17
www.rohm.com
2009.07 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
Power Supply IC Series for TFT-LCD Panels
ingleS -channel Source Voltage
Output
Power
Supply
+
Gamma
Buffer
Amp
ICs
BD8151EFV,BD8157EFV
●Description
The BD8151EFV,BD8157EFV power supply IC are designed for use with TFT-LCD panels. It incorporates a built-in source
voltage step-up switching regulator and gamma correction buffer amp. The combination of a source power supply and
gamma correction buffer on a single chip delivers significant cost savings.
Compatible with input voltages from 2.5 V to 5.5 V (BD8151EFV), 2.1 V to 4.0 V (BD8157EFV), the IC supports low-voltage
operation and reaches over 85% efficiency with a 2.5 V input, contributing to low power consumption designs.
●Features
1) Single-chip implementation of a source power supply and gamma correction buffer
2) Support for low-voltage operation, with input voltages from 2.5 V to 5.5 V (BD8151EFV)
2.1 V to 4.0 V (BD8157EFV)
3) Built-in 1.4 A, 0.2 low-voltage FET
4) Switchable step-up DC/DC switching frequencies: 600 kHz/1.2 MHz
5) Current mode PWM control
6) Under-voltage lockout protection circuit
7) Built-in overcurrent protection circuit
8) Built-in thermal shutdown circuit
●Applications
Satellite navigation systems, laptop PC TFT LCD panels
LCD monitor panels
●Absolute maximum ratings (Ta = 25℃)
Parameter Symbol Limit Unit
Power supply voltage Vcc 7 V
Power dissipation Pd 1000* mW
Operating temperature range
BD8151EFV
Topr
−40 to +85
℃
BD8157EFV −40 to +125
Storage temperature range Tstg −55 to +150 ℃
Switching pin current Isw 1.5** A
Switching pin voltage Vsw 15 V
VS voltage VS 15 V
Maximum junction temperature Tjmax 150 °C
* Reduced by 8 mW/℃ over 25℃, when mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm).
** Must not exceed Pd.
●Recommended Operating Ranges (Ta = 25℃)
Parameter Symbol
Limit
Unit
Min. Typ. Max.
Power supply voltage BD8151EFV Vcc 2.5 3.3 5.5 V
Power supply voltage BD8157EFV Vcc 2.1 2.5 4.0 V
Switching current ISW — — 1.4 A
Switching pin voltage VSW — — 14 V
VS pin voltage VS 5 9 14 V
No.09035EBT11
BD8151EFV, BD8157EFV
Technical Note
2/17
www.rohm.com
2009.07 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
●Electrical Characteristics BD8151EFV (Unless otherwise specified, Ta = 25℃; Vcc = 3.3V, ENB = 3.3V)
Parameter Symbol
Limit
Unit Conditions
Min. Typ. Max.
[Triangular waveform oscillator]
Oscillating frequency 1 FOSC1 540 600 660 kHz FCLK = 0 V
Oscillating frequency 2 FOSC2 1.08 1.20 1.32 MHz FCLK = Vcc
[Overcurrent protection circuit]
Overcurrent limit ISW — 2 — A
[Soft start circuit]
SS source current ISO 6 10 14 µA Vss = 0.5 V
[Under-voltage lockout protection circuit]
Off threshold voltage VUTOFF 2.1 2.2 2.3 V
On threshold voltage VUTON 2.0 2.1 2.2 V
[Error amp]
Input bias current IB — 0.1 0.5 µA
Feedback voltage VFB 1.232 1.245 1.258 V Buffer
[Output]
On resistance RON — 200 300 mΩ *Isw = 1 A
Max. duty ratio DMAX 72 80 88 % RL = 100 Ω
[ENB]
ENB on voltage VON Vcc × 0.7 Vcc — V
ENB off voltage VOFF — 0 Vcc × 0.3 V
[Overall]
Standby current ISTB — 0 10 μA VENB = 0 V
Average consumption current ICC — 1.2 2.4 mA no switching
[Amp]
Input bias current Ibo −1 0 1 μA IN += 4.5 V
Drive current 1 IOO1 50 70 140 mA OUT1 to OUT4
Drive current 2 IOO2 150 200 400 mA VCOM
Max. output current Voho VS-0.16 VS-0.1 — V Io = −5 mA, IN += VS
Min. output current Vohl — 0.1 0.16 V Io = 5 mA, IN += 0 V
This product is not designed for protection against radio active rays.
* Design guarantee (No total shipment inspection is made.)
BD8151EFV, BD8157EFV
Technical Note
3/17
www.rohm.com
2009.07 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
●Electrical Characteristics BD8157EFV (Unless otherwise specified, Ta = 25℃; Vcc = 2.5V, ENB = 2.5V)
Parameter Symbol
Limit
Unit Conditions
Min. Typ. Max.
[Triangular waveform oscillator]
Oscillating frequency 1 FOSC1 480 600 720 kHz FCLK = 0 V
Oscillating frequency 2 FOSC2 0.96 1.20 1.44 MHz FCLK = Vcc
[Overcurrent protection circuit]
Overcurrent limit ISW — 2 — A
[Soft start circuit]
SS source current ISO 6 10 14 µA Vss = 0.5 V
[Under-voltage lockout protection circuit]
Off threshold voltage VUTOFF 1.7 1.8 1.9 V
On threshold voltage VUTON 1.6 1.7 1.8 V
[Error amp]
Input bias current IB — 0.1 0.5 µA
Feedback voltage VFB 1.232 1.245 1.258 V Buffer
[Output]
On resistance RON — 200 600 mΩ *Isw = 1 A
Max. duty ratio DMAX 75 85 95 % RL = 100 Ω
[ENB]
ENB on voltage VON Vcc × 0.7 Vcc — V
ENB off voltage VOFF — 0 Vcc × 0.3 V
[Overall]
Standby current ISTB — 0 10 μA VENB = 0 V
Average consumption current ICC — 1.2 2.4 mA no switching
[Amp]
Input bias current Ibo −1 0 1 μA IN += 4.5 V
Drive current 1 IOO1 50 70 140 mA OUT1 to OUT4
Drive current 2 IOO2 120 200 400 mA VCOM
Max. output current Voho VS-0.16 VS-0.1 — V Io = −5 mA, IN += VS
Min. output current Vohl — 0.1 0.16 V Io = 5 mA, IN += 0 V
This product is not designed for protection against radio active rays.
* Design guarantee (No total shipment inspection is made.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

BD8151EFV-E2

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Manufacturer:
ROHM Semiconductor
Description:
LCD Drivers REGULATOR
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