TPS61166 Datasheet, PDF (1/18 Pages) Texas Instruments – WHITE LED DRIVER WITH INTEGRATED POWER DIODE AND FAST BURST MODE DIMMING

TPS61166
www.ti.com.......................................................................................................................................................................................... SLVS991 – SEPTEMBER 2009
WHITE LED DRIVER WITH INTEGRATED POWER DIODE AND FAST BURST MODE
DIMMING
FEATURES
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• IC Supply Range: 2.5-V to 6-V
• Power Stage Input Range: 4.5-V to 10-V
• Integrated 1.1-A / 20-V Internal Switch FET and
Power Diode
• Drive up to 5 LEDs in Series
• Fast on/off LED Current Within 1-µs in
Brightness Dimming
• Burst PWM Dimming Method With Frequency
Range From 60-Hz to 40-kHz
• Built-in Soft Start-up
• Over Load Protection
• Over Voltage Protection
• 2.5 × 2.5 × 0.8 mm SON Package
APPLICATIONS
• Small Form Factor LCD Backlight
• Mobile Phone
• Digital Camera
• Personal Camcorder
• Single Lens Reflex
DESCRIPTION
The TPS61166 is a boost converter with a 20-V rated
integrated switch FET and power diode that drives up
to 5 LEDs in series. This device integrates a high
side switch FET that can turn on/off the LED current
within 1-µs of the applied external PWM signal. The
high side switch also provides input-to-output
isolation during IC shutdown.
The default white LED current is set with the external
sensor resistor R1, and the feedback voltage is
regulated to 200-mV, as shown in the typical
application circuit. The LED current can be adjusted
using a pulse width modulation (PWM) signal through
the PWM pin. The LED current is synchronized to the
PWM signal. The device does not discharge the
output ceramic capacitor during dimming, thus
reducing audible noise when dimming.
Separating the IC input (VIN pin) and power stage
input (VBAT pin) makes the device flexible enough to
support single- or two-cell Li-ion battery applications.
Other protection features include 1.1-A peak-to-peak
over current protection (OCP), over voltage protection
(OVP), over load protection (OLP), and thermal
shutdown. The TPS61166 is available in a 2.5 mm ×
2.5 mm SON package with thermal pad.
V_in 2.5 V to 6 V
C1
4.7 mF
15 kHz / 50% duty cycle
L1
4.7 mH
TPS61166
VBAT
VIN
NC
EN
PWM
SW
VO
OUT
FB
GND
C2
4.7 mF
R1
8
Figure 1. Single Cell Li-Ion Battery Typical Application
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated