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OCP2131
Programmable Dual Output LCD Bias
for Smartphone and Tablets
General Description
The OCP2131 is designed to support positive /
negative driven TFT-LCD panels up to10” at least (from
SFF to MFF like tablets). The two output rails are usually
connected to the Source Driver IC. The device uses a
single inductor scheme in order to provide the user the
smallest solution size possible as well as high efficiency.
It features a highly integrated step-up DC-DC
converter with wide input voltage range from 2.7V to
5.5V. It is optimized for products powered by single-cell
batteries (Li-Ion, Ni-Li, and Li-Polymer) and symmetrical
output currents up to 80mA. An LDO and charge pump
generate dual outputs at +5V (default) and -5V (default),
whose voltages can be programmed via an I2C
compatible interface. Optimized step-up, LDO and
charge pump converters maximize conversion efficiency,
exceeding 85%.
OCP2131 integrates all compensation and soft-start
circuitry, which results in a simpler and smaller solution
with much fewer external components. High switching
frequency (1.2MHz) allows the use of a smaller inductor
and capacitor to further reduce the solution size.
The I2C compatible interface allows to control the
positive and negative outputs from+4V to +6V and -4V to
-6V, respectively, as well as programming additional
registers on the device.
The device is a RoHs compliant 15-Ball 2.1Xmm X
1.3Xmm X 0.6mm WLCSP andTDFN2.5X3-14L package.
Features
Wide 2.7V to 5.5V Operating Input Range
Dual Output Regulator with Single Inductor
Programmable Output Voltage Voltages
Positive Output Voltage Range:
+4V to +6V (100mV/Step)
Negative Output Voltage Range:
-4V to -6V (100mV/Step)
±1.5% Output Voltage Accuracy
Excellent Line Regulation
Advanced Power-Save Mode for Light Load
Support I2C Compatible Interface
Integrated Compensation and Feedback Circuits
1uA Shut-Down Supply Current
Boost Current Mode Operation
Over Current Protection
Internal Soft-Start Prevents Inrush Current
Under Voltage Lock Out
Thermal Shutdown
Available in an 15-Ball WLCSP
-40to +85Operating Temperature Range
Applications
TFT LCD Smart-phones
TFT LCD Tablets
General Dual Power Supply Application
Pin Configuration
WLCSP-15 (Top View)
Figure 1, Pin Assignments of OCP2131
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Rev. 1.8 Feb. 27, 2018
源于灿瑞 磁传天下

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OCP2131
Pin
Name
ENN
AVEE
CFLY2
ENP
SCL
PGND
VIN
SDA
CFLY1
LX
AGND
BSTO
AVDD
Pin No.
A1
A2
A3
B1
B2
B3,E1
C1
C2
C3
D1
D2
D3,E2
E3
I/O Pin Function
Enable Input for negative output (AVEE). A logic high enable the negative
I Output, a logic low forces the output into shutdown mode reducing the supply
current.
O Charge pump output pin of the negative power.
I/O Negative charge pump flying capacitor pin.
Enable Input for positive output (AVDD). A logic high enable the negative
I Output, a logic low forces the output into shutdown mode reducing the supply
current.
I/O SCL clock input pin of I2C interface.
P Power Ground.
P Input voltage supply pin. Connect a larger than 4.7uF capacitor to ground.
I/O SDA bi-direction data pin of the I2C interface
I/O Negative charge pump flying capacitor pin.
I/O Switch pin of boost converter.
P Analog ground.
I/O Boost converter output pin.
O Output pin of the LDO positive voltage.
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP2131
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Rev. 1.8 Feb. 27, 2018
源于灿瑞 磁传天下

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OCP2131
Ordering Information
Part Number
Driver
Capability
OCP2131WPAD +/-80mA
Package Type Package Qty Temperature Eco Plan
15-Ball WLCSP 3000pcs
-4085Green
Lead/Ball
Finish
Su/Ag/Cu
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Page3 - 3
Rev. 1.8 Feb. 27, 2018
源于灿瑞 磁传天下