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Charge Pump. AAT3157 Datasheet

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Charge Pump. AAT3157 Datasheet






AAT3157 Pump. Datasheet pdf. Equivalent




AAT3157 Pump. Datasheet pdf. Equivalent





Part

AAT3157

Description

High Efficiency 1X/1.5X/2X Charge Pump



Feature


www.DataSheet4U.com High Efficiency 1X/ 1.5X/2X Charge Pump For White LED Appli cations General Description The AAT3157 is a low noise, constant frequency cha rge pump DC/DC converter that uses a tr imode load switch (1X), fractional (1.5 X), and doubling (2X) conversion to max imize efficiency for white LED applicat ions. The AAT3157 is capable of driving up to three chann.
Manufacture

AAT

Datasheet
Download AAT3157 Datasheet


AAT AAT3157

AAT3157; els of LEDs at 20mA per channel from a 2 .7V to 5.5V input. The current sinks ma y be operated individually or in parall el for driving higher current LEDs. A l ow external parts count (two 1μF flyin g capacitors and two small 1μF capacit ors at IN and OUTCP) make this part ide ally suited for small, battery-powered applications. AnalogicTech's S2Cwire™ (Simple Serial Contro.


AAT AAT3157

l™) serial digital input is used to en able, disable, and set current for each LED with 16 settings down to 50μA. Th e low-current mode supply current can b e as low as 50μA to save power. Each o utput of the AAT3157 is equipped with b uiltin protection for output short-circ uit and auto-disable for load short-cir cuit conditions. Built-in softstart cir cuitry prevents excess.


AAT AAT3157

ive inrush current during start-up. A lo w-current shutdown feature disconnects the load from the input and reduces qui escent current to less than 1μA. The A AT3157 is available in a Pb-free, space -saving 2.85x3.0mm 12-pin TSOPJW packag e. AAT3157 Features • • • • • • • • • • • ChargeP ump™ VIN Range: 2.7V to 5.5V Fully P rogrammable Current with Single Wire — 16 Cur.

Part

AAT3157

Description

High Efficiency 1X/1.5X/2X Charge Pump



Feature


www.DataSheet4U.com High Efficiency 1X/ 1.5X/2X Charge Pump For White LED Appli cations General Description The AAT3157 is a low noise, constant frequency cha rge pump DC/DC converter that uses a tr imode load switch (1X), fractional (1.5 X), and doubling (2X) conversion to max imize efficiency for white LED applicat ions. The AAT3157 is capable of driving up to three chann.
Manufacture

AAT

Datasheet
Download AAT3157 Datasheet




 AAT3157
www.DataSheet4U.com
AAT3157
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3157 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-
mode load switch (1X), fractional (1.5X), and dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The AAT3157 is capable of
driving up to three channels of LEDs at 20mA per
channel from a 2.7V to 5.5V input. The current
sinks may be operated individually or in parallel for
driving higher current LEDs. A low external parts
count (two 1μF flying capacitors and two small 1μF
capacitors at IN and OUTCP) make this part ideal-
ly suited for small, battery-powered applications.
AnalogicTech's S2Cwire(Simple Serial Control)
serial digital input is used to enable, disable, and set
current for each LED with 16 settings down to 50μA.
The low-current mode supply current can be as low
as 50μA to save power.
Each output of the AAT3157 is equipped with built-
in protection for output short-circuit and auto-dis-
able for load short-circuit conditions. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature dis-
connects the load from the input and reduces qui-
escent current to less than 1μA.
The AAT3157 is available in a Pb-free, space-sav-
ing 2.85x3.0mm 12-pin TSOPJW package.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
— 16 Current Levels
— Four Low Current Settings Down to 50µA
• Low IQ (50µA) for Low Current Mode
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives up to Three Channels of LEDs
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Automatic Soft Start
• IQ <1µA in Shutdown
• 2.85x3.0mm TSOPJW-12 Package
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
Typical Application
C1
1µF
2.7V to 5.5V
CIN
1µF
EN/SET
C1+ C2+
C1- C2-
IN OUTCP
AAT3157
GND
EN/SET
D1
D2
D3
C2
1µF
D1 D2 D3
COUT
1µF
3157.2006.05.1.2
1




 AAT3157
www.DataSheet4U.com
AAT3157
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
D3
D2
D1
GND
IN
C2-
C2+
OUTCP
C1-
C1+
EN/SET
N/C
Function
Current sink input #3.
Current sink input #2.
Current sink input #1.
Ground.
Input power supply. Requires 1µF capacitor connected between this pin and
ground.
Flying capacitor 2 negative terminal.
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and
C2-.
Charge pump output to drive load circuit. Requires 1µF capacitor connected
between this pin and ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and
C1-.
S2Cwire serial interface control pin.
No connection.
Pin Configuration
TSOPJW-12
(Top View)
D3
D2
D1
GND
IN
C2-
1
2
3
4
5
6
12 N/C
11 EN/SET
10 C1+
9 C1-
8 OUTCP
7 C2+
2 3157.2006.05.1.2




 AAT3157
www.DataSheet4U.com
AAT3157
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VEN/SET
IOUT2
TJ
TLEAD
Description
Input Voltage to GND
EN/SET Voltage to GND
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6
-0.3 to VIN + 0.3
150
-40 to 150
300
Units
V
V
mA
°C
°C
Thermal Information3
Symbol
PD
θJA
Description
Maximum Power Dissipation4
Maximum Thermal Resistance
Value
0.625
160
Units
W
°C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 6.25mW/°C above 25°C.
3157.2006.05.1.2
3



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