LM3697_15 Datasheet, PDF (4/43 Pages) Texas Instruments – High-Efficiency Three-String White LED Driver

LM3697
SNOSCS2C – NOVEMBER 2013 – REVISED OCTOBER 2015
5 Pin Configuration and Functions
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PIN
NUMBER
NAME
A1
PWM
A2
SDA
A3
HWEN
B1
HVLED1
B2
SCL
B3
IN
C1
HVLED2
C2
GND
C3
GND
D1
HVLED3
D2
OVP
D3
SW
Top View
YFQ Package
12-Pin DSBGA
Bottom View
3
3
2
2
1
1
ABCD
DCBA
TYPE
Input
I/O
Input
Input
Input
Input
Input
GND
GND
Input
Input
Output
Pin Functions
DESCRIPTION
PWM brightness control input for CABC operation. PWM is a high-impedance input and cannot
be left floating, if not used connect to GND.
Serial data connection for I²C-Compatible interface.
Hardware enable input. Drive this pinl high to enable the device. Drive this pin low to force the
device into a low power shutdown. HWEN is a high-impedance input and cannot be left floating.
Input pin to high-voltage current sink 1 (40 V maximum). The boost converter regulates the
minimum of HVLED1, HVLED2 and HVLED3 to V_HR.
Serial clock connection for I²C-compatible interface.
Input voltage connection. Bypass IN to GND with a minimum 2.2-µF ceramic capacitor.
Input pin to high-voltage current sink 2 (40 V maximum). The boost converter regulates the
minimum of HVLED1, HVLED2 and HVLED3 to V_HR.
Ground
Ground
Input pin to high-voltage current sink 3 (40 V maximum). The boost converter regulates the
minimum of HVLED1, HVLED2 and HVLED3 to V_HR.
Overvoltage sense input. Connect OVP to the positive terminal of the inductive boost's output
capacitor (COUT).
Drain connection for the internal NFET. Connect SW to the junction of the inductor and the
Schottky diode anode.
4
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