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
Power supply voltage
Power dissipation
Operating temperature range
Storage temperature range
Switching pin current
Switching pin voltage
VS voltage
Maximum junction temperature
BD8151EFV
BD8157EFV
Symbol
Vcc
Pd
Topr
Tstg
Isw
Vsw
VS
Tjmax
Limit
7
1000*
−40
to +85
−40
to +125
−55
to +150
1.5**
15
15
150
Unit
V
mW
℃
℃
A
V
V
°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
Power supply voltage BD8151EFV
Power supply voltage BD8157EFV
Switching current
Switching pin voltage
VS pin voltage
Symbol
Vcc
Vcc
ISW
VSW
VS
Limit
Min.
2.5
2.1
—
—
5
Typ.
3.3
2.5
—
—
9
Max.
5.5
4.0
1.4
14
14
Unit
V
V
A
V
V
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© 2009 ROHM Co., Ltd. All rights reserved.
1/17
2009.07 - Rev.B
BD8151EFV, BD8157EFV
Technical Note
●Electrical
Characteristics BD8151EFV (Unless otherwise specified, Ta = 25℃; Vcc = 3.3V, ENB = 3.3V)
Limit
Parameter
Symbol
Unit
Conditions
Min.
Typ.
Max.
[Triangular waveform oscillator]
Oscillating frequency 1
Oscillating frequency 2
[Overcurrent protection circuit]
Overcurrent limit
[Soft start circuit]
SS source current
Off threshold voltage
On threshold voltage
[Error amp]
Input bias current
Feedback voltage
[Output]
On resistance
Max. duty ratio
[ENB]
ENB on voltage
ENB off voltage
[Overall]
Standby current
Average consumption current
[Amp]
Input bias current
Drive current 1
Drive current 2
Max. output current
Min. output current
Ibo
IOO1
IOO2
Voho
Vohl
−1
50
150
VS-0.16
—
0
70
200
VS-0.1
0.1
1
140
400
—
0.16
μA
mA
mA
V
V
IN += 4.5 V
OUT1 to OUT4
VCOM
Io =
−5
mA, IN += VS
Io = 5 mA, IN += 0 V
ISTB
ICC
—
—
0
1.2
10
2.4
μA
mA
VENB = 0 V
no switching
VON
VOFF
Vcc × 0.7
—
Vcc
0
—
Vcc × 0.3
V
V
RON
DMAX
—
72
200
80
300
88
mΩ
%
*Isw = 1 A
RL = 100
Ω
IB
VFB
—
1.232
0.1
1.245
0.5
1.258
µA
V
Buffer
ISO
VUTOFF
VUTON
6
2.1
2.0
10
2.2
2.1
14
2.3
2.2
µA
V
V
Vss = 0.5 V
[Under-voltage lockout protection circuit]
ISW
—
2
—
A
FOSC1
FOSC2
540
1.08
600
1.20
660
1.32
kHz
MHz
FCLK = 0 V
FCLK = Vcc
This product is not designed for protection against radio active rays.
* Design guarantee (No total shipment inspection is made.)
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© 2009 ROHM Co., Ltd. All rights reserved.
2/17
2009.07 - Rev.B
BD8151EFV, BD8157EFV
Technical Note
●Electrical
Characteristics BD8157EFV (Unless otherwise specified, Ta = 25℃; Vcc = 2.5V, ENB = 2.5V)
Limit
Parameter
Symbol
Unit
Conditions
Min.
Typ.
Max.
[Triangular waveform oscillator]
Oscillating frequency 1
Oscillating frequency 2
[Overcurrent protection circuit]
Overcurrent limit
[Soft start circuit]
SS source current
Off threshold voltage
On threshold voltage
[Error amp]
Input bias current
Feedback voltage
[Output]
On resistance
Max. duty ratio
[ENB]
ENB on voltage
ENB off voltage
[Overall]
Standby current
Average consumption current
[Amp]
Input bias current
Drive current 1
Drive current 2
Max. output current
Min. output current
Ibo
IOO1
IOO2
Voho
Vohl
−1
50
120
VS-0.16
—
0
70
200
VS-0.1
0.1
1
140
400
—
0.16
μA
mA
mA
V
V
IN += 4.5 V
OUT1 to OUT4
VCOM
Io =
−5
mA, IN += VS
Io = 5 mA, IN += 0 V
ISTB
ICC
—
—
0
1.2
10
2.4
μA
mA
VENB = 0 V
no switching
VON
VOFF
Vcc × 0.7
—
Vcc
0
—
Vcc × 0.3
V
V
RON
DMAX
—
75
200
85
600
95
mΩ
%
*Isw = 1 A
RL = 100
Ω
IB
VFB
—
1.232
0.1
1.245
0.5
1.258
µA
V
Buffer
ISO
VUTOFF
VUTON
6
1.7
1.6
10
1.8
1.7
14
1.9
1.8
µA
V
V
Vss = 0.5 V
[Under-voltage lockout protection circuit]
ISW
—
2
—
A
FOSC1
FOSC2
480
0.96
600
1.20
720
1.44
kHz
MHz
FCLK = 0 V
FCLK = Vcc
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.
3/17
2009.07 - Rev.B
BD8151EFV, BD8157EFV
●Reference
Data (Unless otherwise specified, Ta = 25℃)
1.75
STANDBY CURRENT : ICC[μA] .
SUPPLY CURRENT: ICC[mA] .
1.50
1.25
1.00
2.0
REFERENCE VOLTAGE : VREF[V] .
Technical Note
1.260
1.255
1.250
1.245
1.240
1.235
1.230
0
1
2
3
4
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-40℃
125℃
25℃
0.75
0.50
0.25
0.00
25℃
-40℃
150℃
0 0.5 1
2
3
4
5
6
-40
-15
10
35
60
85
110
SUPPLY VOLTAGE : VCC[V]
SUPPLY VOLTAGE : VCC[V]
AMBIENT TEMPERATURE : Ta[
℃
]
Fig. 1 Total Supply Current
Fig. 2 Standby Current
Fig. 3 Reference Voltage
Temperature
2000
0
REFERENCE VOLTAGE : VREF[V]
2.0
BD8157EFV
1.5
SS CURRENT : ISS[μA]
-4
SWITCHING FREQUENCY : FSW[kHz]
1500
VFCLK=VCC
-8
1.0
1000
VFCLK=GND
-12
0.5
500
-16
-20
0
0.5
1
1.5
2
2 .4
0.0
0
1.5
3
4.5
6
7.5
0
-40
-15
10
35
60
85
110
SS VOLTAGE : VSS[V]
SUPPLY VOLTAGE : VCC[V]
AMBIENT TEMPERATURE : Ta[
℃
]
Fig. 4 SS Source Current
20
FCLK CURRENT : FCLK[μA] .
ENB CURRENT : ENB[μA] .
20
Fig. 5 Reference Voltage
Temperature
100
COMP CURRENT : ICOMP[uA] .
Fig. 6 Switching Frequency
Temperature
15
125
℃
15
50
125
℃
10
10
25
℃
25
℃
0
5
-40
℃
5
-40℃
-50
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-100
1.0
1.1
1.2
1.3
1.4
1.5
FCLK VOLTAGE : FCLK[V]
ENB VOLTAGE : VENB[V]
COMP VOLTAGE : VCOMP[V]
Fig. 7 FCLK Pin Current
100
Fig. 8 ENB Pin Current
100
VCC=2.5V f=600kHz
Fig. 9 COMP Sinking vs Source
Current
100
VCC=3.3V f=600kHz
90
EFFICIENCY [%]
95
90
EFFICIENCY [%]
Max Duty [%]
80
VCC=2.5V f=1200kHz
80
90
70
70
VCC=3.3V f=1200kHz
85
60
60
BD8157EFV
80
-40
BD8151EFV
50
50
0
40
80
120
125
0
0.05
0.1
0.15
0.2
0.25
0.3
0
0.02
0.15
0.3
0.45
0.6
AMBIENT TEMPERATURE : Ta[
℃
]
OUTPUT CURRENT : IO[A]
OUTPUT CURRENT : IO[A]
Fig. 10 Max. Duty Ratio Temperature
Fig. 11 Vcc = 2.5 V Power
Efficiency
Fig. 12 Vcc = 3.3 V Power
Efficiency
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© 2009 ROHM Co., Ltd. All rights reserved.
4/17
2009.07 - Rev.B
BD8151EFV, BD8157EFV
●Reference
Data (Unless otherwise specified, Ta = 25℃)
100
Technical Note
0.8
MAXIMUM CURRENT : IOMAX[A] .
BD8157EFV
0.6
90
EFFICIENCY [%]
Io=0mA
F=600kHz
Io=100mA
80
0.4
70
VO
F=1200kHz
60
0.2
100mV/div
BD8157EFV
50
2.0
2.5
3.0
3.5
4.0
20us/div
0
2.1
2.4
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE : VCC[V]
SUPPLY VOLTAGE : VCC[V]
Fig. 13 Power Efficiency vs
Power Supply Voltage
10
10
Fig. 14 Max. Load Current vs
Power Supply Voltage
9
Fig. 15 Load Response
Waveform
OUTPUT VOLTAGE : VO[V]
8
8.8
1
VS CURRENT : IS[mA]
DELAY TIME [ms]
6
8.6
4
8.4
0.1
2
8.2
0.01
0.001
0
0.01
SS CAPACITANCE [μF]
0.1
0
5
10
15
8
0.0
0.1
LOAD CURRENT : IO[A]
1.0
VS VOLTAGE : VS[V]
Fig. 16 SS Capacitance vs
Delay Time
10
OFFSET VOLTAGE:VOFFSET[mV
Fig. 17 VS Pin Current
Fig. 18 Output voltage
Load Regulation 1
9
8
OUTPUT VOLTAGE : VOUT[V]
9
8
OUTPUT VOLTAGE : VOUT[V]
5
0
-5
-10
-15
-20
1
2
3
4
5
6
7
8
9
BUFFER INPUT VOLTAGE:VIN[V]
7
6
5
4
3
2
1
0
0
25
50
75
100 125 150 175 200
OUTPUT CURRENT : IOUT[mA] .
25℃
125℃
-40℃
7
6
5
4
3
2
1
0
-200 -175 -150 -125 -100 -75 -50 -25
OUTPUT CURRENT : IOUT[mA] .
0
-40℃
25℃
125℃
Fig. 19 Buffer Voltage
9
OUTPUT VOLTAGE : VOUT[V] .
OUTPUT VOLTAGE : VOUT[V] .
8
7
6
5
4
3
2
1
0
0
50
100
150
200
250
300
OUTPUT CURRENT : IOUT[mA] .
9
8
7
6
5
4
3
2
1
0
-300
Fig. 20 Buffer Sinking Current
Fig. 21 Buffer Source Current
-40℃
25℃
125℃
IN
125℃
25℃
-40℃
OUT
1us/div
2V/div
-250
-200
-150
-100
-50
0
OUTPUT CURRENT : IOUT[mA]
Fig. 22 VCOM Sinking Current
Fig. 23 VCOM Source Current
Fig. 24 Slew Rate Waveform
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© 2009 ROHM Co., Ltd. All rights reserved.
5/17
2009.07 - Rev.B
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