AAT3151B_08 ANALOGICTECH [Advanced Analogic Technologies], AAT3151B_08 Datasheet

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AAT3151B_08

Manufacturer Part Number
AAT3151B_08
Description
High Efficiency 1X/1.5X Charge Pump For White LED Applications
Manufacturer
ANALOGICTECH [Advanced Analogic Technologies]
Datasheet
1.AAT3151B_08.pdf (13 pages)
General Description
The AAT3151B is a low noise, constant frequency charge
pump DC/DC converter that uses a dual mode load
switch (1X) and fractional (1.5X) charge pump conver-
sion to maximize efficiency for white LED applications.
The AAT3151B is capable of driving four white LEDs at a
total of 120mA from a 2.7V to 5.5V input. The current
sinks may be operated individually or in parallel for driv-
ing higher-current LEDs. A low external parts count (two
1μF flying capacitors and two small 1μF capacitors at V
and V
battery-powered applications.
AnalogicTech’s AS
Control™) serial digital input is used to enable, disable,
and set current for each LED with a 16-level logarithmic
scale plus four low-current settings down to 50μA for
optimized efficiency, with a low housekeeping current of
only 50μA.
The charge pump output of the AAT3151B is equipped
with built-in protection for V
has short-circuit and auto-disable to guard against LED
failure conditions. Built-in soft-start circuitry prevents
excessive inrush current during start-up. A low-current
shutdown feature disconnects the load from V
reduces quiescent current to less than 1μA.
The AAT3151B is available in a Pb-free, space-saving,
thermally-enhanced, 12-pin 3x3mm TDFN package.
Typical Application
3151B.2008.02.1.1
ChargePump
OUT
) makes the AAT3151B ideally suited for small
TM
2
Cwire™ (Advanced Simple Serial
2.7V to 5.5V
EN/SET
OUT
High Efficiency 1X/1.5X Charge Pump For White LED Applications
. Each current sink input
C
1μF
IN
VIN
EN/SET
w w w . a n a l o g i c t e c h . c o m
AAT3151B
IN
GND
and
IN
VOUT
C1+
C2+
C1-
C2-
D1
D2
D3
D4
Features
• V
• Fully Programmable Current with Single Wire
• Dual Mode 1X and 1.5X Charge Pump for Maximum
• Drives Four Channels of LEDs
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable for Short-Circuit
• Automatic Soft Start
• I
• TDFN33-12 Package
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
▪
▪
▪
▪
Efficiency and V
Q
IN
C1
1μF
C2
1μF
16-Step Logarithmic Scale
15/20/30mA Max Current
Four Low-Current Settings Down to 50μA
Low I
<1μA in Shutdown
Range: 2.7V to 5.5V
D1
Q
D2
(50μA) for Low-Current Mode
D3
F
Coverage
D4
PRODUCT DATASHEET
AAT3151B
C
1μF
OUT
1

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AAT3151B_08 Summary of contents

Page 1

ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications TM General Description The AAT3151B is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) charge pump conver- sion ...

Page 2

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Pin Descriptions Pin # Symbol Function 1 D4 Current sink input #4. 2 EN/SET AS Cwire serial interface ...

Page 3

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Absolute Maximum Ratings Symbol Description V Input Voltage IN V EN/SET to GND Voltage EN/SET I Maximum DC ...

Page 4

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Electrical Characteristics 1.0μ -40°C to +85°C, unless otherwise ...

Page 5

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Typical Characteristics 3151B Backlight Efficiency vs. Supply Voltage 100 1mA 10.2mA 40 30 ...

Page 6

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Typical Characteristics Load Characteristics (V = 3.7V; 1.5X Mode; 15mA Load (40mV/div) CP (40mV/div) V ...

Page 7

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Typical Characteristics Enable Threshold High vs. Input Voltage 1.2 1.1 1 -40°C 0.9 0.8 0.7 25°C 85°C 0.6 ...

Page 8

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Functional Block Diagram VIN EN/SET Functional Description The AAT3151B is a dual mode load switch (1X) and high ...

Page 9

ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications TM 20mA Max 30mA Max 1 Data I (mA) I (mA) OUT OUT 1 20.0 30.0 2 17.8 26.7 3 15.9 23.8 4 14.3 21.4 5 12.7 19.0 6 11.1 ...

Page 10

ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications TM When the Max Current register is programmed changing the data for Address 1 will result in the corresponding values found in the Constant Current ...

Page 11

ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications TM Applications Information LED Selection The AAT3151B is specifically intended for driving white LEDs. However, the device design will allow the AAT3151B to drive most types of LEDs with forward ...

Page 12

ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications TM Charge Pump Section Efficiency The AAT3151B contains a fractional charge pump that will boost the input supply voltage when V the voltage required on the constant current sink inputs. ...

Page 13

ChargePump ChargePump High Efficiency 1X/1.5X Charge Pump For White LED Applications High Efficiency 1X/1.5X Charge Pump For White LED Applications TM TM Ordering Information Package TDFN33-12 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products ...

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