Charge Pump. AAT3177 Datasheet

AAT3177 Pump. Datasheet pdf. Equivalent

Part AAT3177
Description High Efficiency Charge Pump
Feature PRODUCT DATASHEET www.DataSheet4U.com AAT3177 High Current, High Efficiency Charge Pump with Auto-T.
Manufacture Advanced Analogic Technologies
Datasheet
Download AAT3177 Datasheet



AAT3177
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3177
High Current, High Efficiency Charge Pump with Auto-Timer
General Description
The AAT3177 is a high output current, high efficiency,
low noise, low profile charge pump DC/DC converter.
The device is ideal for multi-functional LED photo-flash
applications where solution cost, size, and efficiency are
critical.
The AAT3177 is capable of driving a regulated output
current up to 800mA. Output current levels can be eas-
ily programmed in 16 steps through AnalogicTech’s
Simple Serial Control™ (S2Cwire™) interface controlled
by a single microcontroller GPIO line. This allows smooth
transitions and flexible adjustment of brightness in flash
or other lighting modes. The maximum output current
can also be set with an external RSET resistor.
The tri-mode (1X/1.5X/2X) operation of the internal
charge pump offers excellent power efficiency through-
out the output current range for both flash and movie
modes. Combined with a low external parts count (two
1μF flying capacitors and two small bypass capacitors at
VIN and OUT), the AAT3177 is ideally suited for small
battery-powered applications.
The AAT3177 has a thermal management system to pro-
tect the device in the event of a short-circuit condition at
the output pin. Built-in soft-start circuitry prevents
excessive inrush current during start-up. The shutdown
feature disconnects the load from VIN and reduces quies-
cent current to less than 1μA.
The AAT3177 is available in a Pb-free, thermally-
enhanced 12-pin 3x3mm TDFN package and is specified
over the -40°C to +85°C temperature range.
Features
• Up to 800mA Output Current
• Tri-Mode 1X/1.5X/2X in Current Mode
• 16 Current Level Steps Set by S2Cwire
• Flash Auto-Timer (Active for High Current Levels
Only)
• External RSET to Set Maximum Current
• <1μA of Shutdown
• Small Application Circuit
• No Inductors
• Automatic Soft Start
• 12-Pin TDFN 3x3mm Package
• -40°C to +85°C Temperature Range
Applications
• Camcorders
• Camera Phones
• Digital Still Cameras
• PDAs and Notebook PCs
• Smart Phones
Typical Application
1μF 1μF
2.7V
to 5.5V
C1+ C1- C2+ C2+
VIN
CIN
4.7μF
AAT3177
OUT
EN
0.1μF
EN/SET
CT
GND
FL
RSET
COUT
2.2μF
Flash
LED
187K
3177.2008.06.1.0
www.analogictech.com
1



AAT3177
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3177
High Current, High Efficiency Charge Pump with Auto-Timer
Pin Descriptions
Pin #
1
2
3
4
5
6
7
Symbol
VIN
C1+
C1-
GND
FL
RSET
EN/SET
8 CT
9 C2-
10 C2+
11 OUT
12 VIN
EP
Function
Input power supply pin. Connect Pin 1 directly to Pin 12 and then to input supply voltage. Con-
nect a 4.7μF or larger ceramic capacitor to ground.
Flying capacitor C1 positive terminal. Connect a 1μF ceramic capacitor between C1+ and C1-.
Flying capacitor C1 negative terminal.
Ground connection.
Controlled current sink. Connect the ash LED cathode to this pin.
Connect resistor here to set maximum output current.
Charge pump enable / set input control pin. When in the low state, the AAT3177 is powered down
and consumes less than 1μA. When connected to logic high level, the AAT3177 charge pump is
active. This pin should not be left oating.
Flash timeout capacitor. Connect a 0.1μF capacitor between this pin and GND for a ash timeout
of 1 second.
Flying capacitor C2 negative terminal.
Flying capacitor C2 positive terminal. Connect a 1μF ceramic capacitor between C2+ and C2-.
Charge pump output. Connect a 2.2μF or larger ceramic capacitor to ground. Connect to ash
LED anode to drive the LED.
Input power supply pin. Connect Pin 12 directly to Pin 1 and then to input supply voltage.
Exposed paddle (bottom). Connect to GND directly beneath package.
Pin Configuration
TDFN33-12
(Top View)
VIN 1
C1+ 2
C1- 3
GND 4
FL 5
RSET 6
12 VIN
11 OUT
10 C2+
9 C2-
8 CT
7 EN/SET
2
www.analogictech.com
3177.2008.06.1.0





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