IR2E51Y
IR2E51Y
Auto-Brightness Control
LED Driver
■Description
IR2E51Y
incorporates white LED driver with auto
brightness control.
This IC is equipped with charge pump DC/DC converter.
Input voltage is boosted into CPO by a charge pump circuit.
This IC maintains high efficiency since the charge pump
circuit automatically selects 1x or 1.5x charge pump mode
depending on input voltage and load.
It contains 4 white LED drivers to drive the main-LCD
backlight, 2 white LED drivers for sub-LCD backlight and
RGB-LED drivers.
All LED are connected in parallel.
With peripheral ambient light sensor, this IC automatically
adjusts white LED brightness to ambient brightness.
This IC supports I
2
C-Bus interface.
This product is optimum for use as the backlight white
LED driver IC for cellular phone and PDA applications, etc.
■Agency
approvals/Compliance
1. Compliant with RoHS directive(2002/95/EC)
■Applications
1.Back light and call alert display
(White & RGB LED)
■Features
1. Supply Voltage Range: V
IN
=3.0V to 4.5V, V
CC
=2.3V to 3.2V
2. Supports I
2
C-Bus interface
3. SCL pin and SDA pin are installed with noise filters.
4. Sink-type variable constant current driver for LED
(maximum current 27.4mA/ch)
5. Monitoring all LED pins
(Response to VF variation of LED)
6.Auto brightness control circuit for main-LCD embedded.
(16 steps and 128 gradation sequence)
7.PWM LED Brightness Control (0% to 100%) (RGB)
(The PWM signal frequency of 2kHz to 5kHz is recommended.)
8.1x/1.5x Modes Charge Pump: Automatically Selected
9.Voltage reference embedded
10.Stand-by circuit embedded
11.Power-on-reset circuit embedded
12.Soft-Start Limits Inrush Current
13.Effective illuminance range (3lx to 55000lx) (GA1A1S201WP)
Notice The content of data sheet is subject to change without prior notice.
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP
devices shown in catalogs, data books, etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
Sheet No.: F1-A00101EN
Date Dec.01.2006
©SHARP Corporation
IR2E51Y
■Block
diagram
COUT
CPO
VIN
CIN
C1P
C1
C1N
C2P
<CHARGE
PUMP>
·1x or 1.5x
·3.0 to 4.5V
input
·MAX
200mA
M1
M2 M3
M4
S1
S2
R
G
B
EN_RGB
I:0V-VDD
PGND1
PGND2
<CURRENT DRIVER>
·MAIN LCD 4ch
·SUB LCD 2ch
·RGB Fan Light 3ch
·Each channel MAX DRIVE CURRENT 27.4mA
·Monitor the voltage of all LED connected pins
and control boost-up mode (1x or 1.5x)
VCC
SW
<OSC>
GND
O:0V-VCC
C2
C2N
CGND
·CHARGE PUMP
·TYP 660kHz
<AUTO BRIGHTNESS
CONTROL>
·128 gradation sequence
·16 steps
PD
IREF_PD
SENSOR
RIREF_PD
VDD
<VREF,IREF>
·Maximum current of
driver set up by
peripheral resistance
IREF
RIREF
GND
VCC
<I
2
C,CONTROL LOGIC>
·Control driver current
·Control auto brightness control
SDA
SCL
XRESET
I:0V-VDD
1.8V
CVDD
I
2
C-BUS
KEY
GND
O:0V-VCC
CVCC
2.3V~3.2V
KEY PAD
Sheet No.: F1-A00101EN
IR2E51Y
■Outline
Dimensions
(Unit : mm)
(Note)It is those with an underline printing in a date code because of a LEAD FREE type.
A
B
INDEX(laser marking)
TOP VIEW
S 0.1
0.82±0.08
SIDE VIEW
S
Φ0.28(TYP.)
0.17±0.03
S 0.08
D
3.57±0.05
P-0.5(TYP.)
C
A B C D E
D
F
BOTTOM VIEW
1
2
3
4
5
6
P-0.5(TYP.)
Φ0.29±0.05
3.57±0.05
0.20 M S AB
0.10 M S CD
Package name
: WLP035-X-3636
Lead finish or Ball type : LEAD FREE TYPE (Sn-3Ag-0.5Cu) *Use of an "Under-fill"
Package weight.
: 0.03g/pcs. About.
(Note) Body dimensions do not include burr of resin.
*Use of an "Under-fill": Since the external terminals are arranged at intervals of 0.5mm, SHARP recommends use of appropriate
"Under fill" to this product for high reliability.
■Markings.
（1）
（2）
（3）
Product name
： IR2E51
Company name
： SHARP
Date code
： （Example）YYWW
XXXX
YY
→
Denotes the production year. (Last two digits of the year.)
WW
→
Denotes the production week.（01・02・½・52・53）
XXXX
→
Denotes the production ref. code.
“JAPAN” indicates the country of origin.
（4）
Sheet No.: F1-A00101EN
IR2E51Y
■Terminal
Name
Pin No
A1
A2
A3
A4
A5
A6
B1
B2
B3
B4
B5
B6
C1
C2
C4
C5
C6
D1
D2
D3
D4
D5
D6
E1
E2
E3
E4
E5
E6
F1
F2
F3
F4
F5
F6
Pin name
U1A
SW
PD
VDD
SCL
U2A
EN_RGB
IREF_PD
VCC
SDA
KEY
M2
G
IREF
XRESET
M1
PGND1
PGND2
B
GND2
GND1
M3
M4
VIN
R
C1N
S1
S2
CGND
U1F
C1P
CPO
C2P
C2N
U2F
Description
Non-connect. This terminal is connected pin No. F1 (U1F).
Terminal of VCC output switch circuit for peripheral ambient light sensor.
Ambient light sensor terminal for auto brightness control (logarithmic output current type).
Supply voltage for I
2
C.
I
2
C clock input.
Non-connect. This terminal is connected pin No. F6 (U2F).
Enable for RGB LED.
Resistor connection terminal for reference current setting of auto brightness control.
Power supply terminal.
I
2
C data Input/Output terminal.
Control signal output terminal which disables key pad LED.
Constant current output terminal for main LED2.
Constant current output terminal for green LED.
Resistor connection terminal for reference current setting of LED drivers.
Hard reset terminal.
Constant current output terminal for main LED1.
Main and sub LED driver ground.
RGB-LED driver ground.
Constant current output terminal for blue LED.
Ground terminal for control.
Ground terminal for control.
Constant current output terminal for main LED3.
Constant current output terminal for main LED4.
Power supply terminal for charge pump.
Constant current output terminal for red LED.
Flying capacitor 1 negative connection.
Constant current output terminal for sub LED1 (It can be used as main LED5).
Constant current output terminal for sub LED2 (It can be used as main LED6).
Ground terminal for charge pump.
Non-connect. This terminal is connected pin No. A1 (U1A).
Flying capacitor 1 positive connection.
Output voltage terminal of charge pump.
Flying capacitor 2 positive connection.
Flying capacitor 2 negative connection.
Non-connect. This terminal is connected pin No. A6 (U2A).
Sheet No.: F1-A00101EN
IR2E51Y
■Pin
Assignment
1
2
3
4
5
6
A
U1A
SW
PD
VDD
SCL
U2A
B
EN_RGB IREF_PD
VCC
SDA
KEY
M2
C
G
IREF
XRESET
M1
PGND1
D
PGND2
B
GND2
GND1
M3
M4
E
VIN
R
C1N
S1
S2
CGND
F
U1F
C1P
CPO
C2P
C2N
U2F
Note: Pins are located on the underside.
Sheet No.: F1-A00101EN
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