AAT2805 Datasheet, PDF (2/17 Pages) Advanced Analogic Technologies – Dual High Efficiency Charge Pump for White LED and Flash Applications

AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Pin Descriptions
Pin #
1
2
3
Symbol
C3-
C3+
VOUT_FL
4
VIN
5
D4
6
D3
7
D2
8
D1
9
GND
10
EN/SET
11
C1+
12
C1-
13
VOUT_BL
14
C2+
15
C2-
16
EN_FLSH
EP
Function
Flying capacitor 3 negative terminal.
Flying capacitor 3 positive terminal. Connect a 1µF capacitor between C3+ and C3-.
Regulated output voltage for flash LED. Requires 1µF capacitor connected between this
pin and ground.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Current sink input 4.
Current sink input 3.
Current sink input 2.
Current sink input 1.
Ground.
AS²Cwire serial interface control pin. It is used to enable/disable the backlight charge
pump and to control the brightness of the white LEDs.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Regulated output voltage for white LED. Requires 1µF capacitor connected between this
pin and ground.
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Flying capacitor 2 negative terminal.
Enable/disable pin for the flash charge pump.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TDFN44-16
(Top View)
C3- ¹
C3+ ²
VOUT_FL ³
VIN ⁴
D4 ⁵
D3 ⁶
D2 ⁷
D1 ⁸
16 _{EN_FLSH}
15 _C2-
14 _C2+
13 _{VOUT_BL}
12 _C1-
11 C1+
10 _EN/SET
9 _GND
2
2805.2005.05.1.2