AAT3172IWP-T1 Advanced Analogic Technologies, Inc., AAT3172IWP-T1 Datasheet

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AAT3172IWP-T1

Manufacturer Part Number
AAT3172IWP-T1
Description
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer
Advanced Analogic Technologies, Inc.
Datasheet

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AAT3172IWP-T1
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Quantity:
3 750
General Description
The AAT3172 is a high output current, high efficiency,
low noise, low profile charge pump DC/DC converter,
ideal for multi-function LED photo-flash applications
where solution cost, size, and efficiency are critical.
The dual charge pump in the AAT3172 is capable of deliv-
ering 600mA output current. Two current-controlled paths
are available for users of dual flash LEDs that prefer cur-
rent matching. Each LED channel can be easily pro-
grammed in 32 steps with a single GPIO output through
the AS
face. This allows smooth transitions and flexible adjust-
ment of brightness in flash or other lighting modes.
The tri-mode (1X/1.5X/2X) operation of the internal
charge pump offers excellent power efficiency for both
flash and movie modes. Combined with a low external
parts count (two 1µF flying capacitors and one small
bypass capacitor at V
suited for small, battery-powered applications.
The AAT3172 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 V
cent current to less than 1.0µA.
The AAT3172 is available in the Pb-free, thermally-
enhanced, 12-pin 3x3mm TDFN package.
Typical Application
ChargePump
3172.2008.04.1.6
2
Cwire™ (Advanced Simple Serial Control™) inter-
TM
IN
and OUT), the AAT3172 is ideally
2.7V to 5.5V
EN/SET
IN
and reduces quies-
4.7µF
C
IN
w w w . a n a l o g i c t e c h . c o m
EN/SET
V
C1+
IN
1µF
C1
AAT3172
C1- C2+
High Current LED Flash Driver Charge Pump IC
GND
1µF
C2
V
Features
• V
• 600mA Output Current
• Tri-Mode 1X/1.5X/2X in Current Mode
• Voltage Mode Operation: 1.5X, 100mA
• Dual Regulated Current Sinks
• Current Match Between Current Sinks
• 32 Current Steps Set by AS
• 1µF Input, Output, and Flying Capacitors
• <1.0µA of Shutdown
• Small Application Circuit
• No Inductors
• Automatic Soft Start
• 12-Pin TDFN 3x3mm Package
• -40°C to +85°C Temperature Range
Applications
• Camera Phones
• Digital Still Cameras (DSCs)
• PDAs and Notebook PCs
• Smart Phones
C2-
OUT
F1
F2
IN
Range: 2.7V to 5.5V
C
2.2µF
OUT
LED 1
Flash
PRODUCT DATASHEET
LED 2
Flash
2
Cwire
AAT3172
1

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AAT3172IWP-T1 Summary of contents

Page 1

ChargePump TM General Description The AAT3172 is a high output current, high efficiency, low noise, low profile charge pump DC/DC converter, ideal for multi-function LED photo-flash applications where solution cost, size, and efficiency are critical. The dual charge pump in ...

Page 2

ChargePump ChargePump TM TM Pin Descriptions Pin # Symbol Function 1, 12 VIN Input power supply pin. Requires 4.7µF bypass capacitor to ground. 2 C1+ Flying capacitor C1 positive terminal. Connect a 1.0µF capacitor between C1+ and C1-. 3 C1- ...

Page 3

ChargePump ChargePump TM TM Absolute Maximum Ratings T = 25°C, unless otherwise noted. A Symbol Description V Input Voltage GND Voltage EN V Maximum EN to Input Voltage EN(MAX) I Maximum DC Output Current OUT T ...

Page 4

ChargePump ChargePump TM TM Electrical Characteristics1 C = 4.7µ 2.2µ 1.0µ OUT 3.6V. IN Symbol Description Power Supply V Input Voltage Range IN V Maximum Output Voltage OUT(MAX) ...

Page 5

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 4.7µ 2.2µ OUT Efficiency vs. Supply Voltage 100 90 50mA/ 2. 152mA/ 3. 95mA/ch ...

Page 6

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 4.7µ 2.2µ OUT Load Characteristic (V = 3.0V; 1.5X Mode; 50mA/ch Load (100mV/div) V OUT (200mV/div) V SINK (200mV/div) 2µs/div Load ...

Page 7

ChargePump ChargePump TM TM Typical Characteristics V = 3.6V 4.7µ 2.2µ OUT Voltage Mode Load Response (V = 3.3V OUT (100mV/div) 100mA I OUT 10mA (100mA/div) 5ms/div T vs. V LAT ...

Page 8

ChargePump ChargePump TM TM Functional Block Diagram VIN EN/SET Functional Description The AAT3172 is a high efficiency, low noise, dual stage tri-mode 1X/1.5X/2X charge pump device intended for photo-flash LED applications. The AAT3172 requires only four external components: two 1.0µF ...

Page 9

ChargePump TM battery operating range for 1X and 1.5X modes, improv- ing efficiency and extending battery life. Each constant current sink is programmable through the AS serial interface. Independent current settings can be used for a multistage flash LED control. ...

Page 10

ChargePump TM AS Cwire Serial Interface Addressing 2 EN/SET Rising Address Edges and F2 Current Scale Voltage/Current Mode HI/LO Scale Register (Address 3) Data F1 ...

Page 11

ChargePump TM Applications Information AS Cwire Programming 2 Generally, programming the AAT3172 is achieved by submitting bursts of address and data edges to the EN/ SET pin. However, in some cases multiple bursts of address and data are needed to ...

Page 12

ChargePump TM 2. 4.7µF EN/SET LED Selection The AAT3172 is designed to drive high-intensity white LEDs particularly suitable for LEDs with an operat- ing forward-voltage in the range of 4.2V to 1.5V. The charge ...

Page 13

ChargePump TM time, output ripple, and transient performance. Optimum performance will be obtained when low equivalent series resistance (ESR) (<100mΩ) ceramic capacitors are used. A value of 1µF for the flying capacitors is a good starting point when choosing capacitors. ...

Page 14

... High Current LED Flash Driver Charge Pump IC Marking Part Number (Tape and Reel) 1 QLXYY TDFN33-12 Detail "A" 1.70 ± 0.05 Bottom View 0.05 ± 0.05 Side View PRODUCT DATASHEET PRODUCT DATASHEET AAT3172 AAT3172 2 AAT3172IWP-T1 0.43 ± 0.05 0.1 REF C0.3 Pin 1 Indicator (optional) Detail "A" 3172.2008.04.1.6 3172.2008.04.1.6 ...

Page 15

... Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifi cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fi ...

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