Driver IC. AAT3176 Datasheet
The AAT3176 is a high output current, high efficiency, low
noise, low profile charge pump converter IC, ideal for
multi-function LED photo-flash applications where solu-
tion cost, size, and efficiency are critical. The charge
pump is capable of delivering up to 500mA of output cur-
rent and can be easily programmed in 16 steps with a
single GPIO output through AnalogicTech's S2Cwire™
(Simple Serial Control) interface. This allows smooth
transitions and flexible adjustment of brightness in flash
or other lighting modes. Operating at a fast 1MHz switch-
ing frequency, the dual-mode (1x/2x) operation of the
internal charge pump offers excellent power efficiency for
both flash and movie modes and combined with a low
external parts count (one 1μF flying capacitors and small
bypass capacitors at VIN and OUT), the AAT3176 is ide-
ally suited for small, battery-powered applications.
The maximum current for both Flash and Movie mode is
set by two independent external resistors. The MODE pin
is adopted to select the LED current between Movie
(Torch) and Flash mode.
The AAT3176 has a thermal management system to pro-
tect the device in the event of short-circuit, open-circuit,
and over-temperature condition. Built-in soft-start cir-
cuitry prevents excessive in-rush current during start-
up. The shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1.0μA.
The AAT3176 is available in the 2.2 x 2.2mm Pb-free
10-pin TDFN package.
500mA LED Flash Driver IC
• 2.7V to 5.5V Supply Voltage Range
• Up to 500mA Output Drive Capability at 3.6V VIN
• Flexible Brightness Control
▪ 16 Step Output Current by S2Cwire
• Separate External Resistors to Set Maximum Flash and
• Dual Mode 1x/2x Charge Pump
• < 1.0μA in Shutdown
• Small Application Circuit
• Automatic Soft-Start Limits Inrush Current
• Open- and Short-Circuit Protection
• Thermal Shutdown Protection
• -40 to +85°C Temperature Range
• 10-pin TDFN2.2x2.2 Package
• Digital Still Cameras (DSC)
• LED Photo Flash/Torch
• Mobile Handsets
• PDAs and Notebook PCs
2.7V to 5.5V
500mA LED Flash Driver IC
Flying capacitor C1 positive terminal. Connect a 1.0 μF capacitor between C1+ and C1-.
Charge-pump output. Requires 2.2uF bypass capacitor to ground.
Output current source. Connect the ﬂash LED anode to this pin.
Connect a resistor to GND to set maximum FLASH output current.
Connect a resistor to GND to set maximum MOVIE-MODE output current.
Selects between Flash and Movie Mode:
When MODE is HIGH, it is in Flash Mode with RSETF for maximum current.
When MODE is LOW, it is in Movie Mode with RSETM for maximum current .
Charge Pump enable / set input control pin.
When in the low state, the AAT3176 is shut down, and consumes less than 1μA. When connected logic
high level, the AAT3176 is active. This pin must be connected.
Ground connection and ﬂash LED cathode.
Flying capacitor C1 negative terminal.
Input power supply pin. Requires 4.7μF bypass capacitor to ground.
Exposed pad. Connect directly to ground beneath the package.