TPS61058 Datasheet, PDF (1/30 Pages) Texas Instruments – SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER

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(3,25 mm x 3,25 mm)
TPS61058
TPS61059
SLVS572B – APRIL 2005 – REVISED DECEMBER 2005
SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE
HIGH POWER WHITE LED DRIVER
FEATURES
• 80% Efficient Synchronous Boost Converter
– 500-mA LED Current From 3.3-V Input
(TPS61058)
– 800-mA LED Current From 3.3-V Input
(TPS61059)
• Input Voltage Range: 2.7 V to 5.5 V
• Fixed Frequency 650 kHz (Typ) Operation
• LED Disconnect During Shutdown
• Open/Shorted LED Protection
• Over-Temperature Protection
• Low Shutdown Current: 100 nA (Typ)
• Total Solution Of Less Than 80 mm²
• Small 3mm x 3mm QFN-10 Package
APPLICATIONS
• Torch/Camera White LED Supply for Cell
Phones, Smart-Phones and PDAs
L1
2.7 V . . 5.5 V
4.7 µH
VIN
C _IN
22 µF
TPS61058
SW
VOUT
PVIN
VIN
FB
FLASH ON (0/1.8 V)
EN
GND
GND
IOK
PGND
C1, C2, C3
22 µF
x3
D1
R2
C3
1 nF
(COG)
R1
22 kΩ
R5
39 kΩ
Rs
R3 ^{1.5 Ω}
56 kΩ
5.6 kΩ
R4
62 kΩ
Figure 1. 500 mA Flashlight Application
DESCRIPTION
The TPS61058/9 devices are fixed frequency,
synchronous boost dc-dc converters with an
integrated down conversion mode. The devices are
optimized for driving high power single cell white
LEDs up to 800 mA from a 2.7-V to 5.5-V input. The
LED current can be programmed to different levels
(e.g. torch, flashlight) by a set of external resistors.
The boost converter is based on a 650 kHz fixed
frequency, pulse-width-modulation (PWM) controller
using a synchronous rectifier to obtain maximum
efficiency. The maximum peak current in the boost
switch is limited to 1000 mA (TPS61058) and 1500
mA (TPS61059).
The converter can be disabled to maximize battery
life. In the shutdown mode, the load is completely
disconnected and the current consumption is reduced
to less than 1 µA. Built-in precharge and soft-start
circuitry prevents excessive inrush current during
start-up.
The device is packaged in a 10-pin QFN
PowerPAD™ package measuring 3 mm x 3 mm
(DRC).
100
90
I_LED = 500 mA @ V_F = 3.7 V
80
70
60
50
40
30
20
10
0
2.70 3.10 3.50 3.90 4.30 4.70 5.10 5.50
V_I - Input Voltage - V
Figure 2. Flashlight Efficiency vs V_IN
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.
PowerPAD is a trademark of Texas Instruments.
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 © 2005, Texas Instruments Incorporated