Single-chip Type with Built-in FET Switching Regulator Series
Boost and Inverted Output
Power Supply for TFT-LCD Displays
BD83850GWL
General Description
BD83850GWL is a boost switching regulator and charge
pump inverter for small TFT-LCD Displays. It has a wide
input voltage range of 2.5V to 4.5V that is suitable for
portable applications. In addition, its small package
design is ideal for miniaturizing the power supply.
Key Specifications
■
■
■
■
■
■
■
■
Input Voltage Range
Output Boost Voltage
Output Inverted Voltage
Maximum Current
Operating Frequency
Efficiency
Output Voltage Accuracy
Standby Current
2.5V to 4.5V
5.0V(typ)
-5.0V(typ)
50mA(max)
1.0MHz(typ)
>85 %(typ)
±2 %(typ)
1µA(max)
Features
Wide input voltage range of 2.5V to 4.5V
High frequency operation
Output Discharge Independent ON/OFF
signal(STBYP, STBYN)
Circuit protection
Over Current Protection (OCP)
Short Current Protection (SCP)
Under Voltage Lock Out (UVLO)
Thermal Shutdown (TSD)
Package
W(Typ) x D(Typ) x H(Max)
Applications
TFT LCD Smart phones
TFT LCD Tablets
Typical Application Circuit
L
LX
4.7µH
UCSP50L1C
1.80mm x 1.50mm x 0.57mm
LX
V
IN
2.5V to 4.5V
C1
4.7µF
VIN
PGND1
PGND2
AGND
STBYP
STBYN
VOUTP
C
VOP
4.7µF
C
CP
2.2µF
V-
-5.0V/max50mA
VREG
C
VREG
4.7µF
V+
5.0V/max50mA
CP1
CP2
VOUTN
C
VON
4.7µF
Figure 1. Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
.
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© 2014 ROHM Co., Ltd. All rights reserved.
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〇This
product has no designed protection against radioactive rays
1/19
TSZ02201-0242AAJ00160-1-2
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BD83850GWL
Contents
General Description ....................................................................................................................................................1
Features .......................................................................................................................................................................1
Applications ................................................................................................................................................................1
Key Specifications ......................................................................................................................................................1
Package
W(Typ) x D(Typ) x H(Max) .......................................................................................................................1
Typical Application Circuit .........................................................................................................................................1
Pin Configuration ........................................................................................................................................................3
Pin Description............................................................................................................................................................3
Block Diagram .............................................................................................................................................................4
Absolute Maximum Ratings (Ta = 25°C) ...................................................................................................................4
Recommended Operating Conditions ......................................................................................................................4
Electrical Characteristics (Unless otherwise specified V
IN
=3.7V Ta=25°C) ..........................................................5
Typical Performance Curves .....................................................................................................................................6
Application Information ........................................................................................................................................... 11
Description of Protection Circuits ....................................................................................................................... 11
Application Example .............................................................................................................................................13
Selection of External Components ......................................................................................................................13
Power Dissipation .....................................................................................................................................................14
I/O Equivalent Circuit ...............................................................................................................................................15
Operational Notes .....................................................................................................................................................16
Ordering Information ................................................................................................................................................18
Physical Dimension, Tape and Reel Information ...................................................................................................18
Revision History .......................................................................................................................................................19
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BD83850GWL
Pin Configuration
C
B
A
1
2
3
4
Figure 2. Pin assignment
(Bottom view)
Pin Description
Pin No.
B-1
A-3
B-2
C-1
B-4
C-4
A-1
C-2
B-3
C-3
A-2
A-4
Pin Name
CP2
PGND1
PGND2
CP1
VREG
VOUTP
VOUTN
AGND
STBYN
STBYP
VIN
LX
Negative charge pump flying capacitor
Boost Power ground
Charge pump Power ground
Negative charge pump flying capacitor
Boost converter output
LDO output (V+)
Charge pump inverter (V-) output
Analog ground
Charge pump inverter (V-) enable
LDO enable (V+)
Input voltage supply
Boost converter switch
(only STBYP=H)
Function
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BD83850GWL
Block Diagram
V
IN
(Battery Voltage)
C
VIN
4.7µF
L
LX
4.7µH
VIN
PGND1
LX
VREG
C
VREG
4.7µF
OCP
Backgate
Control
VREF
LDO
VOUTP
V+
C
VOP
4.7µF
TSD
UVLO
VREF
STBYP
STBYN
LOGIC
SOFT
START
SEQ.
VREF
OSC1M
BOOST
CONVERTER
SCP
VREG
UVLO
OSC500k
CP1
CHARGE
PUMP
PGND2
CP2
C
CP
2.2µF
V-
C
VON
4.7µF
OSC1M
REF
AGND
OSC500k
OSC1M
VREF
VREF
VOUTN
Figure 3. Block diagram
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Maximum power supply voltage
Voltage range
Power dissipation
(note1)
Symbol
VIN
STBYP,STBYN
LX
VOUTP
Pd
Tstg
Tjmax
Rating
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
0.69
-55 to +150
+150
Unit
V
V
V
V
W
°C
°C
Storage temperature range
Junction temperature
(Note 1) Derate by 5.5mW/°C when operating above Ta=25°C (when mounted in ROHM’s standard board).
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions
Standard value
MIN
2.5
-40
TYP
-
25
MAX
4.5
85
Parameter
Power supply voltage
Operating temperature range
Symbol
VDD
Topr
Units
V
°C
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TSZ02201-0242AAJ00160-1-2
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BD83850GWL
Electrical Characteristics (Unless otherwise specified V
IN
=3.7V Ta=25°C)
Standard value
MIN
2.5
2.20
-
-
TYP
-
2.26
2.39
0.13
MAX
4.5
-
2.50
-
Parameter
【Power
Supply】
Input Voltage Range
UVLO Detect Voltage
UVLO UnDetect Voltage
UVLO Hysteresis Voltage
【Soft
Start Sequence】
VOUTP Soft Start Time
VOUTN Soft Start Time
【Boost
Converter】
LX Switching Frequency
LX OCP Current
VREG Output Voltage
VREGUVLO Voltage 1
VREGUVLO Voltage 2
【Output
VOUTP】
Output Voltage
Output Voltage Accuracy
Maximum Output Current
Line Regulation
Load Regulation
Discharge Resistor
【Output
VOUTN】
CP Switching Frequency
Output Voltage
Output Voltage Accuracy
Maximum Output Current
Line Regulation
Load Regulation
Discharge Resistor
【STBYP,STBYN】
STBY pin
Control voltage
Active
Non-active
Symbol
Unit
Conditions
V
IN
V
UVLO1
V
UVLO2
V
HYS
V
V
V
V
t
SSVP
t
SSVN
0.4
3.7
0.5
4.1
1.0
4.6
ms
ms
C
VOP
=4.7µF+4.7µF
C
VON
=4.7µF+6.8µF
f
SWLX
OCPLXL
V
VREG
V
RUVLO1
V
RUVLO2
0.90
0.6
5.10
1.9
4.35
1.00
-
5.25
2.1
4.55
1.10
-
5.40
2.3
4.75
MHz
A
V
V
V
Among Soft Start Operation
V
OUTP
V
OUTPAQ
I
OUTP
V
OPLINE
V
OPLOAD
R
OPDIS
4.900
-2
-
-
-
20
5.000
-
-
0.1
10
40
5.100
2
50
-
-
80
V
%
mA
%/V
mV
Ω
Iout=10mA
Iout=50mA
VREG=5.25V
f
SWCP
V
OUTN
V
OUTNAQ
I
OUTN
V
ONLINE
V
ONLOAD
R
ONDIS
450
-5.100
-2
-
-
-
10
500
-5.000
-
-
0.1
10
20
550
-4.900
2
50
-
-
40
kHz
V
%
mA
%/V
mV
Ω
Iout=10mA
Iout=50mA
VREG=5.25V
V
STBH
V
STBL
R
STB1
1.5
-0.3
500
-
-
800
VIN
0.3
1100
V
V
kΩ
STBY pin pull down resistance
【Circuit
current】
Standby current
Circuit current of operation VIN
I
STB
I
DD
-
1.3
0
2.5
1
5.0
µA
mA
STBYP=STBYN=L
STBYP=STBYN=H
VOUTP IL=0,VOUTN IL=0
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