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A8435 Datasheet(PDF) 3 Page - Allegro MicroSystems

Part No. A8435
Description  High Efficiency Charge Pump White LED Driver
Download  9 Pages
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A8435 Datasheet(HTML) 3 Page - Allegro MicroSystems

   
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High Efficiency Charge Pump White LED Driver
A8435
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
(Top View)
Name Pin Number
Function*
C1–
13
Negative terminal of capacitor C1.
C1+
16
Positive terminal of capacitor C1.
C2–
15
Negative terminal of capacitor C2.
C2+
1
Positive terminal of capacitor C2.
CTRL
4
Brightness control scheme toggle. For 2-bit parallel or PWM dimming, leave open or tie to VIN
(see table 1). For single-wire serial input dimming, connect to GND (see figure 2).
EN1
3
When CTRL is open or HIGH: Enable and dimming control input 1 (see table 1).
When CTRL is grounded: single-wire enable and dimming control (see table 1 and figure 2).
(Do not leave unconnected.)
EN2
5
When CTRL is open or HIGH: Enable and dimming control input 2 (see table 1).
When CTRL is grounded: this pin disables shutdown. (Do not leave unconnected.)
EP
Exposed metal pad on bottom side. Connect this to ground plane for better thermal
performance.
GND
11
Ground.
ISET
6
Connect RSET resistor to ground to set desired constant current through LEDs.
LED1
8
Current sink for LED1. Connect to VIN or VOUT if not used for LED. (Do not leave unconnected.)
LED2
7
Current sink for LED2. Connect to VIN or VOUT if not used for LED. (Do not leave unconnected.)
LED3
10
Current sink for LED3. Always connect this pin to LED.
LED4
9
Current sink for LED4. Connect to VIN or VOUT if not used for LED. (Do not leave unconnected.)
NC
12
No Connection.
VIN
14
Power supply voltage input.
VOUT
2
Charge pump voltage source output for connection to the LED anodes.
* See Application Information section for cited figure and tables.
Terminal List Table
12
11
10
9
NC
GND
LED3
LED4
1
2
3
4
C2+
VOUT
EN1
EP
CTRL
Pin-out Diagram


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