APW7001 Datasheet, PDF (1/19 Pages) Anpec Electronics Coropration – 1X/1.5X/2X Charge Pump White LED Driver for Main and Sub-Displays

APW7001
1X/1.5X/2X Charge Pump White LED Driver for Main and Sub-Displays
Features
• ±1.5% LED Current Matching
• Powers Main and Sub-Display LEDs
• High Efficiency Up to 90% Over Li-ion Battery
Discharge
• Output Current Up to 30mA per LED
• 2.7V to 5.5V Operating Voltage
• 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
• 16-pin QFN Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Cellular Phone White LED Back Light
• Portable Device
• PDA, Handheld Computer
• DSC
General Description
The APW7001 is a high efficiency charge pump white
LED driver; the device drives up to four white LEDs in the
main display and up to two white LEDs in the sub-display
with regulated constant current for uniform intensity. The
supply voltage ranges from 2.7V to 5.5V and it is opti-
mized for a Li-ion battery application. The APW7001 op-
erates in 1x, 1.5x, and 2x charge pump modes and auto-
matically switches the charge pump modes depend on
the input voltage to maintain the required power for high
power efficiency. The APW7001 provides up to 30mA per
LED and allows several methods such as the PWM sig-
nals on the ENM pin for main-display dimming and on
the ENS pin for sub-display dimming. The two control
logic pins, ENM and ENS, allow disabling or enabling the
main and sub-displays. The supply current is only 2mA in
2x mode, and the ENM and ENS are kept low for 20ms
will allow the device to enter shutdown mode with 2µA
quiescent current. The APW7001 features current limit
and short circuit protection. The APW7001 switches at
1MHz frequency and only requires four 1µF ceramic ca-
pacitors and one resistor, and ensures low input current
ripple and EMI. The APW7001 is available in a 16-pin
QFN package.
Pin Configuration
16 15 14 13
ILED 5 1
ILED 6 2
ENM ₃
ENS 4
Metal
GND Pad
(Bottem)
12 _GND
11 C1-
10 C1+
9 C2-
56 78
APW7001
QFN4x4-16 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.4 - Oct., 2009
www.anpec.com.tw