LP3936 Datasheet, PDF (2/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
An efficient magnetic boost converter provides the required bias operating from a single Li-Ion battery. The
DC/DC converter output voltage is user programmable for adapting to different LED types and for efficiency
optimization. All functions are software controllable through an I²C and MicroWire/SPI compatible interface and
16 internal registers.
Connection Diagrams and Package Mark Information
32-Lead TLGA Package, 4.5 x 5.5 x 0.8 mm, 0.5 mm pitch
1 32 31 30 29 28 27 26 25
FB 2
V_{DD2 3}
GND2 4
WLED1 5
WLED2 6
WLED3 7
WLED4 8
LP3936
24 DI
23 DO
22 CS
21 NRST
20 MW_SEL
19 RT
18 VREF
9 10 11 12 13 14 15 16 17
25 26 27 28 29 30 31 32 1
DI 24
DO 23
CS 22
NRST 21
MW_SEL 20
RT 19
V_REF 18
LP3936
2 FB
3 VDD2
4 GND2
5 WLED1
6 WLED2
7 WLED3
8 WLED4
17 16 15 14 13 12 11 10 9
Figure 1. TLGA Package – Top View
See Package Number NPC0032A
Figure 2. TLGA Package – Bottom View
Pin Description
Pin
Name
Type
Description
1
GND_BOOST
Ground
Power Switch Ground
2
FB
Input
Boost Converter Feedback
3
V_DD2
Power
Supply Voltage for Internal Digital Circuits
4
GND2
Ground
Ground Return for V_DD2 (Internal Digital)
5
WLED1
LED Output Open Drain, White LED1 Output
6
WLED2
LED Output Open Drain, White LED2 Output
7
WLED3
LED Output Open Drain, White LED3 Output
8
WLED4
LED Output Open Drain, White LED4 Output
9
GND_WLED
Ground
4+2 White LED Driver Ground
10
WLED5
LED Output Open Drain, White LED5 Output
11
WLED6
LED Output Open Drain, White LED6 Output
12
V_DDA
13
GND1
14
V_DD1
15
AIN
Output
Ground
Power
Input
Internal LDO Output, 2.8V
Ground Return for V_DD1 (Internal Analog)
Supply Voltage for Internal Analog Circuits
Ambient Light Sensor Input
16
AREF
Output
Reference Voltage for Ambient Light Sensor, 1.23V
17
GND_T
Ground
Ground
18
V_REF
Output
Internal Reference Bypass Capacitor
19
RT
Input
Oscillator Resistor
20
MW_SEL
Logic Input
MicroWire — I²C select (MW_SEL=1 in MicroWire Mode)
2
Submit Documentation Feedback
Product Folder Links: LP3936
Copyright © 2003–2013, Texas Instruments Incorporated