AP2071 Datasheet, PDF (1/31 Pages) Asahi Kasei Microsystems – High Current (8A) white LEDs driver for Flash with I2C

[AP2071AEN]
AP2071AEN
High Current (8A) white LEDs driver for Flash with I²C
1. General Description
The AP2071AEN is a white LED driver IC for camera flash, using EDLC (Electronic Double Layer
Capacitor) in portable equipment. The AP2071AEN integrates a current mode synchronous boost DC-DC
converter and four maximum 2A current sources (maximum 8.0A total). The internal boost DC-DC converter
integrates a switching FET and synchronous rectifier, and supporting small size multilayer inductor with
2MHz switching frequency. An integrated EDLC voltage control circuit and a charge current control circuit
makes the AP2071AEN most suitable for EDLC charge systems. The AP2071AEN also includes eight
protections that are an under voltage lock out, EDLC cell short/open protection, thermal detection, LED
open/short detection, LED thermal protection, output-ground short protection, inductor current limitation and
flashing time limitation to avoid significant system problems. Flash current, torch current, charge current,
inductor limit current, flash on-time and EDLC full charge voltage are programmable through I²C interface.
The AP2071AEN is housed in a small size package (24-pin QFN, 4.0mm x 4.0mm) to utilize less board space.
2. Features
 Power Supply Voltage(VIN): 2.5V~5.5V
 LED Current:
max 8.0A, total (max 2.0A/ch)
 High Efficiency:
- 90% @ VIN pin=3.7V, VOUT pin=4.5V, total LED current= 240mA,
Torch mode, with recommended external parts
 Switching Frequency:
2.0 MHz
 Mode:
- Charge (charge to EDLC)
- Flash
- Torch
- Bypass torch
(Boost circuit off, only drive LEDs with fixed current source)
- Discharge
 I²C Function:
- Flash/Torch LED current setting (Each channel can be set independently)
- Flashing ON-time setting
- Charge current setting
- Current Limit value setting
- Full charge voltage setting (EDLC)
- Discharge finishing voltage setting (EDLC)
- NTC voltage detection voltage setting
 Protection Function:
- UVLO (Under Voltage Lock Out) protection
- EDLC cell short/open protection
- Thermal protection
- LED Open/Short protection
- LED thermal protection
- Output-GND protection
- Inductor current limitation protection
- Flashing time limitation protection
 Ta:
 Package:
-30 to 85C
24-pinUQFN (4.0 x 4.0mm, 0.5mm pitch)
MS1607-E-00
-1-
2014/03