iD5212
Preliminary
100mA 5-Channel Charge Pump White LED Driver
General Description
Features
The iD5212 is a 5-channel white LED driver having
Ultra-Low-Noise application
high performances. It integrates current sources and
85% Average Efficiency Over Battery Life
an automatic mode selection charge pump. The part
80mV Typical Current Source Dropout
achieves high efficiency by utilizing an x1/x1.5
Support Up to 5 White LEDs; 100mA Output
fractional charge pump and low dropout current
Current
sources. The small equivalent x1 mode open loop
1% Typical LED Current Accuracy
resistance and ultra-low dropout voltage of current
0.7% Typical LED Current Matching
source extend the operating time of x1 mode and
Soft Start Function
optimize the efficiency of Li-ion battery in white LED
Auto Charge Pump Mode Selection
applications.
250kHz Fixed Frequency Oscillator
The iD5212 supports up to 5 white LEDs and
Output Over Voltage Protection
regulates a constant current for uniform intensity. The
Low 0.4µA Shutdown Current
part implements a 4-bit DAC for brightness control.
16-Step Brightness Control
Users can easily configure the LED current from
1.25mA to 20mA by a serial pulse. The dimming of
Applications
white LED current can be achieved by applying a
pulse signal to the EN pin. There are totally 16 steps
Mobile Phone
of current could be set by users. The operating
DSC
voltage range is 2.8V to 5.0V. Internal soft start
MP3/MP4
circuitry effectively reduces the in-rush current for both
White LED Backlighting
start-up and mode transition. The shutdown current is
LCD Display Supply
less than 1µA. The iD5212 is available in a WQFN
3x3-16L package.
Ordering Information
Dec. 2007
1
Rev 0.1
Preliminary
iD5212
Typical Application Circuit
Absolute Maximum Ratings (Note 1)
Supply Voltage VIN
Recommended Operating Conditions
6V
Input Voltage VIN
Power Dissipation, PD @ TA=25°C
WQFN-16
EN Input Voltage
1.47W
2.8V to 5V
0V to 5.5V
Junction Temperature Range
-40°C to 125°C
Ambient Operating Temperature
-40°C to 85°C
Thermal Resistance, Θja
WQFN-16
Lead Temperature
Storage Temperature
Dec. 2007
68°C/W
260 °C
-65°C to 150°C
2
Rev 0.1
Preliminary
iD5212
Electrical Characteristics
(Unless otherwise specified VIN=3.6V, VF=3.4V, CIN= COUT = CFLY = 1uF, ILED =15mA, TA=25°C)
Note 1: Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated
in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may remain possibility to affect device reliability.
Dec. 2007
3
Rev 0.1
Preliminary
iD5212
Pin Configurations (Top View)
Pin Description
Dec. 2007
4
Rev 0.1
Preliminary
iD5212
Function Block Diagram
Dec. 2007
5
Rev 0.1
iD5212
Preliminary
PACKAGING
WQFN-16L 3x3
SYMBOLS
A
A1
A2
A3
b
D
D1
E
E1
e
L
θ
Dec. 2007
DIMENSIONS IN MILLIMETERS
MIN
0.45
0.00
0.51
--0.20
2.95
--2.95
----0.35
-12
NOM
0.50
0.002
0.54
0.06 REF
0.25
3.00
1.7 BSC
3.00
1.70 BSC
0.50 BSC
0.40
---
MAX
0.55
0.004
0.59
--0.30
3.03
--3.03
----0.45
0
6
DIMENSIONS IN INCH
MIN
0.018
0.000
0.020
--0.008
0.116
--0.116
----0.0137
-12
NOM
0.020
0.00008
0.021
0.0023REF
0.0098
0.118
0.067REF
0.118
0.067BSC
0.020BSC
0.0157
---
MAX
0.022
0.00016
0.023
--0.012
0.119
--0.119
----0.0177
0
Rev 0.1