fitipower integrated technology lnc.
FP9928A
Integrated Multi-Channel
DC-DC Converters for Panels
Description
Features
The FP9928A offers a compact power supply solution
to provide all voltages required by EPD panel. The
FP9928A includes 2 high performance PFM DC-DC
converters, one is for positive voltage and the other is
for negative voltage used by EPD drivers, a VCOM
buffer (unity-gain OPA), a positive charge pump and
a negative charge pump to provide adjustable
regulated output voltages.
High Efficiency
Low Power Consumption
2.7V to 5.5V Input Supply Voltage
I2C Serial Interface
Over-Temperature Protection
DC-DC Converters
Fast Transient Response to Pulsed Load
Built-In 20V, 800mA, 1Ω MOSFET
Built-In Soft-Start
The converters provide the regulated positive and
negative supply voltage for the panel source driver
ICs.
Over-Current Protection
LDO Regulator
Built-In ±15V LDO with ±0.15V accuracy for
Source Driver Supply
The positive charge pump controller provides
regulated EPD gate-on voltage.
charge pump controller provides regulated EPD
gate-off voltage.
The negative
Adjustable VCOM Driver for Accurate
Panel-Backplane Biasing
-0.6V to -5V
8-bit Control
Accurate back-plane biasing is provided by a linear
amplifier and can be adjusted either by an external
resistor or the I2C interface. The VCOM driver can
source or sink current depending on panel condition.
For automatic VCOM adjustment in production line,
VCOM can be set from -0.6V to -5V with 8 bit control
through the serial interface.
Regulated Charge Pumps
Charge Pump for VGH Regulation
Charge Pump for VGL Regulation
TQFN-24 (4mm×4mm) Package
RoHS Compliant
Thermistor Monitoring
-10°C to +85°C Temperature Range
±1°C Accuracy from 0°C to 50°C
The FP9928A provides precise temperature
measurement function to monitor the panel
temperature during operation.
The FP9928A
automatically updates the temperature every 60s.
Applications
Electro-Phoretic Display (EPD) Panel
E-Book
P-DVD
CAR TV
Pin Assignments
WQ Package (TQFN-24)(4mm×4mm)
Ordering Information
23
24
22
21
20
19
FP9928A□□□
1
2
3
4
5
6
FBGH
18
17
16
15
14
13
DRVN
TR: Tape/Reel
Blank: Tube
VPOS_IN
VPOS
FBGL
VNEG_IN
25
VSS
VNEG
EN
TP
C: Green
OPOUT
VSSOP
TS
Package Type
7
8
9
10
11
12
WQ: TQFN-24 (4mm×4mm)
Note: Connect pin25 to VSS
Figure 1. Pin Assignment of FP9928A
FP9928A-0.1-OCT-2013
1