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AAT3155 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT3155
Beschreibung High Efficiency 1X/1.5X/2X Charge Pump
Hersteller AAT
Logo AAT Logo 




Gesamt 11 Seiten
AAT3155 Datasheet, Funktion
www.DataSheet4U.com
AAT3155
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3155 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 AAT3155 is capable of
driving up to four 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 AAT3155 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 AAT3155 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 Four 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
AAT3155
GND
EN/SET
D1
D2
D3
D4
C2
1µF
D1 D2 D3 D4
COUT
1µF
3155.2006.05.1.1
1






AAT3155 Datasheet, Funktion
www.DataSheet4U.com
AAT3155
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.6V, unless otherwise noted.
Load Characteristics
(VIN = 3.9V; 1.5X Mode; 20mA Load)
Load Characteristics
(VIN = 3.9V; 1.5X Mode; 14mA Load)
VIN
(40mV/div)
VCP
(40mV/div)
VSINK
(20mV/div)
VIN
(40mV/div)
VCP
(20mV/div)
VSINK
(20mV/div)
Time (500ns/div)
Time (500ns/div)
VIN
(40mV/div)
VCP
(40mV/div)
VSINK
(40mV/div)
Load Characteristics
(VIN = 2.9V; 2X Mode; 20mA Load)
Time (500ns/div)
VIN
(40mV/div)
VCP
(40mV/div)
VSINK
(40mV/div)
Load Characteristics
(VIN = 2.9V; 2X Mode; 14mA Load)
Time (500ns/div)
Input Ripple vs. Input Voltage
14.0
12.0
20mA/channel
10.0 14mA/channel
8.0
6.0
4.0
10mA/
2.0 channel
0.0
2.5 3.0 3.5 4.0 4.5
Input Voltage (V)
5.0
5.5
EN/SET Latch Timeout vs. Input Voltage
350
300
250 -40°C
200
150
100
25°C
85°C
50
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
6 3155.2006.05.1.1

6 Page







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