AAT3195 Driver Datasheet

AAT3195 Datasheet PDF, Equivalent


Part Number

AAT3195

Description

4-Channel Charge-Pump LED Driver

Manufacture

AAT

Total Page 16 Pages
PDF Download
Download AAT3195 Datasheet PDF


AAT3195
ChargePumpTM
General Description
The AAT3195 is a charge-pump based, current-sink
white LED driver capable of driving one to four LEDs up
to 30mA, each. It automatically switches between 1x
mode and 2x mode to maintain the highest efficiency
and optimal LED current accuracy and matching.
The AAT3195 charge pump’s 1x mode (bypass mode)
has very low resistance allowing LED current regulation
to be maintained with input supply voltage approaching
www.DatatShheeeLt4EUD.cofmorward voltage. The AAT3195 incorporates an
internal RSET and is available in a thermally enhanced,
Pb-free 2x2.1mm 10-lead SC70JW-10 package.
PRODUCT DATASHEET
AAT3195
4-Channel Charge-Pump LED Driver
Features
• Drives up to 4 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 2x Modes
• 1MHz Switching Frequency
• Linear LED Output Current Control
Single-wire, S2Cwire™ Interface
• AAT3195-1: 30mA, 32-step
• AAT3195-2: 20mA, 32-step
ON/OFF or PWM Interface
• AAT3195-3
• ±10% LED Output Current Accuracy
• 3% LED Output Current Matching
• Low-current Shutdown Mode
• Built-in Thermal Protection
• Automatic Soft-start
• 2x2.1mm SC70JW-10 Package
Applications
• Cordless Phone Handsets
• Digital Cameras
• Mobile Phone Handsets
• MP3 and PMP Players
Typical Application
Input Voltage
2.7V to 5.5V
CIN
1µF
CP
1µF
EN/SET
S2Cwire
Interface
IN OUT
C+
AAT3195
C-
EN/SET
GND
D1
D2
D3
D4
COUT
1µF
WLEDs
3195.2008.09.1.0
www.analogictech.com
1

AAT3195
ChargePumpTM
PRODUCT DATASHEET
AAT3195
4-Channel Charge-Pump LED Driver
Pin Descriptions
Pin #
1
Symbol
D2
2 D1
3
4
www.DataShee5t4U.com
OUT
C+
IN
EN/SET
(AAT3195-1/-2)
6
EN/PWM
(AAT3195-3)
7 C-
8 AGND
9 D4
10 D3
Description
LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and its
cathode to D2.
LED1 Current Sink Input. D1 is the input of LED1 current sink. Connect LED1’s anode to OUT and its
cathode to D1.
Charge Pump Output. OUT is the output of the charge pump. Bypass OUT to AGND with a 1μF or
larger ceramic capacitor.
Charge Pump Capacitor Positive Node. Connect a 1μF ceramic capacitor between C+ and C-.
Power source input. Connect IN to the power source, typically the battery. Bypass IN to AGND with
a 1μF or larger ceramic capacitor.
LED Enable and serial control input. EN/SET is the ON/OFF control for the LED and the S2Cwire
digital input for the AAT3195-1/-2 to control serially the LED brightness according to the maximum
current set by RSET.
LED ON/OFF and PWM control input. This logic input controls the LED outputs for the AAT3195-3.
Alternatively, a PWM signal from a GPIO or an equivalent signal from a separate controller can be
used to control LED output current linearly. A PWM signal, ranging from 10% to 100% duty cycle,
controls the LED current linearly between ZS and FS.
Charge Pump Capacitor Negative Node.
Analog Ground. Connect this pin to the system’s analog ground plane.
LED4 Current Sink Input. D4 is the input of LED4 current sink. Connect LED4’s anode to OUT and its
cathode to D4.
LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect LED3’s anode to OUT and its
cathode to D3.
Pin Configuration
SC70JW-10
(Top View)
D2
D1
OUT
C+
IN
1
2
3
4
5
10 D3
9 D4
8 AGND
7 C-
6 EN/SET (EN/PWM)
2
www.analogictech.com
3195.2008.09.1.0


Features PRODUCT DATASHEET AAT3195 ChargePump TM 4-Channel Charge-Pump LED Driver Feat ures • • • • Drives up to 4 LED s at up to 30mA, each Automatic Switchi ng Between 1x and 2x Modes 1MHz Switchi ng Frequency Linear LED Output Current Control ▪ Single-wire, S2Cwire™ Int erface • AAT3195-1: 30mA, 32-step • AAT3195-2: 20mA, 32-step ▪ ON/OFF or PWM Interface • AAT3195-3 ±10% LED Output Current Accuracy 3% LED Output C urrent Matching Low-current Shutdown Mo de Built-in Thermal Protection Automati c Soft-start 2x2.1mm SC70JW-10 Package General Description The AAT3195 is a c harge-pump based, current-sink white LE D driver capable of driving one to four LEDs up to 30mA, each. It automaticall y switches between 1x mode and 2x mode to maintain the highest efficiency and optimal LED current accuracy and matchi ng. The AAT3195 charge pump’s 1x mode (bypass mode) has very low resistance allowing LED current regulation to be m aintained with input supply voltage approaching www.DataSheet4U.com the LED forward vo.
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