APW7008 Datasheet, PDF (1/21 Pages) Anpec Electronics Coropration – 1X/1.5X/2x Charge Pump White LED Driver

APW7008
1X/1.5X/2x Charge Pump White LED Driver
Features
• ±1.5% LED Current Matching
• High Efficiency Up to 90% Over Li-ion Battery
Discharge
• Output Current Up to 30mA per LED
• 2.7V to 5.5V Operating Voltage
• Allow to Turn On or Off a Combination of LEDs
• 1x/1.5x/2x Charge Pump Modes
• Low Shutdown Current: 2µA Maximum
• Low Input Ripple and EMI
• Internal Soft-Start Limits Inrush Current
• Short Circuit Current-Limit
• Thermal Shutdown Protection
• Output Over-Voltage Protection
• 3mmx3mm 16-pin QFN (QFN3X3-16) Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Cellular Phone White LED Back Light
• Portable Device
• PDA and Handheld Computer
• DSC
General Description
The APW7008 is a high efficiency charge pump white
LED driver; the device drives up four white LEDs with
regulated constant current for uniform intensity. The sup-
ply voltage ranges from 2.7V to 5.5V and it is optimized for
a Li-ion battery application. The APW7008 operates in 1x,
1.5x, and 2x charge pump modes and automatically
switches the charge pump modes depend on the input
voltage to maintain the required power for high power
efficiency. The APW7008 provides up to 30mA per LED
for a total of 120mA and allows several methods, such as
a PWM signal on the CTRL0 pin for LED dimming. Three
control logic pins allow to disable or enable a combina-
tion of LEDs. The supply current is only 2mA in 2x mode,
and the EN pin allows the device to enter shutdown mode
with 2µA quiescent current. The APW7008 switches at
1MHz frequency and only requires four 1µF ceramic ca-
pacitors and one resistor, and ensures low input current
ripple and EMI.
The APW7008 is available in a 16-pin QFN package.
Pin Configuration
16 15 14 13
EN 1
CTRL0 2
CTRL1 ₃
CTRL2 4
Metal
GND Pad
(Bottom)
12 _GND
11 C1-
10 C1+
9 C2-
56 78
APW7008
QFN3x3-16 Top View
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. A.3 - Feb., 2009
www.anpec.com.tw