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LM3697 Datasheet(PDF) 13 Page - Texas Instruments

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Part No. LM3697
Description  High-Efficiency Three-String White LED Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3697 Datasheet(HTML) 13 Page - Texas Instruments

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High Voltage
Current Sinks
Hardware Enable,
Reference, and
Thermal Shutdown
Selectable
500kHz/1MHz
Switching
Frequency
COUT
OVP
SW
HVLED1
HVLED2
IN
SDA
SCL
I2C
Compatible
Interface
Selectable Over
Voltage Protection
(16V, 24V, 32V, 40V)
LED String Open/
Short Detection
1A Current Limit
PWM
Internal Low Pass
Filter
Backlight LED Control
1, 5 bit Full Scale
Current Select
2, 11 bit brightness
adjustment
3, Linear/Exponential
Dimming
4, LED Current
Ramping
CIN
Boost Converter
HVLED3
HWEN
VOUT up to 40V
VIN = 2.7V to 5.5V
LM3697
www.ti.com
SNOSCS2A – NOVEMBER 2013 – REVISED DECEMBER 2013
FUNCTIONAL DESCRIPTION
The LM3697 provides the power for three high-voltage LED strings. The three high-voltage LED strings are
powered from an integrated boost converter. The device is configured over an I2C-compatible interface. The
LM3697 provides a Pulse Width Modulation (PWM) input for content adjustable brightness control.
PWM Input
The PWM input can be assigned to either of the high-voltage control banks. When assigned to a control bank,
the programmed current in the control bank becomes a function of the duty cycle (DPWM) at the PWM input and
the control bank brightness setting. When PWM is disabled DPWM is equal to one.
HWEN Input
HWEN is the global hardware enable to the LM3697. HWEN must be pulled high to enable the device. HWEN is
a high-impedance input so it cannot be left floating. When HWEN is pulled low the LM3697 is placed in
shutdown, and all the registers are reset to their default state.
Thermal Shutdown
The LM3697 contains a thermal shutdown protection. In the event the die temperature reaches +140°C, the
boost, charge pump, and current sinks will shut down until the die temperature drops to typically +125°C.
Functional Block Diagram
Figure 44. Functional Block Diagram
Copyright © 2013, Texas Instruments Incorporated
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