Buffer Amp. BD8151EFV Datasheet

BD8151EFV Amp. Datasheet pdf. Equivalent

Part BD8151EFV
Description Single-channel Source Voltage Output Power Supply + Gamma Buffer Amp
Feature Power Supply IC Series for TFT-LCD Panels Single-channel Source Voltage Output Power Supply + Gamma.
Manufacture Rohm
Total Page 21 Pages
Datasheet
Download BD8151EFV Datasheet



BD8151EFV
Power Supply IC Series for TFT-LCD Panels
Single-channel Source Voltage
Output Power Supply + Gamma Buffer Amp ICs
BD8151EFV,BD8157EFV
No.09035EBT11
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
Power supply voltage
Vcc 7
Power dissipation
Operating temperature range
BD8151EFV
BD8157EFV
Pd
Topr
1000*
40 to +85
40 to +125
Storage temperature range
Tstg 55 to +150
Switching pin current
Isw 1.5**
Switching pin voltage
Vsw 15
VS voltage
VS 15
Maximum junction temperature
Tjmax
* 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.
150
Unit
V
mW
A
V
V
°C
Recommended Operating Ranges (Ta = 25)
Parameter
Power supply voltage BD8151EFV
Power supply voltage BD8157EFV
Switching current
Switching pin voltage
VS pin voltage
Symbol
Vcc
Vcc
ISW
VSW
VS
Min.
2.5
2.1
5
Limit
Typ.
3.3
2.5
9
Max.
5.5
4.0
1.4
14
14
Unit
V
V
A
V
V
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/17
2009.07 - Rev.B



BD8151EFV
BD8151EFV, BD8157EFV
Technical Note
Electrical Characteristics BD8151EFV (Unless otherwise specified, Ta = 25; Vcc = 3.3V, ENB = 3.3V)
Parameter
Symbol
Min.
Limit
Typ.
Max.
Unit
Conditions
[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 m*Isw = 1 A
Max. duty ratio
DMAX
72
80
88 % RL = 100
[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.)
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
2/17
2009.07 - Rev.B





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