TPS60250 Datasheet, PDF (1/24 Pages) Texas Instruments – HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE

TPS60250
www.ti.com
SLVS769 – APRIL 2007
HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I²C INTERFACE
FEATURES
• 3.0-V to 6.0-V Input Voltage Range
• ×1 and ×1.5 Charge Pump
• Fully Programmable Current with I²C
– 64 Dimming Steps with 25mA Maximum
(Sub and Main Display Banks)
– 4 Dimming Steps with 80mA Maximum
(DM5 for Auxiliary Application)
• 2% Current Matching for Sub LEDs at Light
Load Condition (Each 100µA)
• 750-kHz Charge Pump Frequency
• Continuous 230-mA Maximum Output Current
• Auto Switching Between ×1 and ×1.5 Mode for
Maximum Efficiency
• Built-in Soft Start and Current Limit
• Open Lamp Detection
• 16-Pin 3mm x 3mm QFN
APPLICATIONS
• Cellular Phones
• PDA, PMP, GPS (Up To 4 Inch LCD Display)
• Multidisplay Handheld Devices
DESCRIPTION
The TPS60250 is a high efficiency, constant
frequency charge pump DC/DC converter that uses a
dual mode 1× and 1.5× conversion to maximize
efficiency over the input voltage range. It drives up to
five white LEDs for a main display and up to two
white LEDs for a sub display with regulated constant
current for uniform intensity. By utilizing adaptive
1×/1.5× charge pump modes and very low-dropout
current regulators, the TPS60250 achieves high
efficiency over the full 1-cell lithium-battery input
voltage range.
Four enable inputs, ENmain, ENsub1, ENsub2, and
ENaux, available through I²C, are used for simple
on/off controls for the independent main, sub1, sub2,
and DM5 displays, respectively. To lower operating
current when using one sub display LED, the device
provides completely separate operation in sub
display LEDs.
The TPS60250 is available in a 16-pin 3mmx3mm
thin QFN.
Main Display
C2 C3
1mF 1mF
GND DM4 DM3 DM2
C1-
DM1
C2+
DS2
C2-
DS1
Sub Display
C1+
DM5
VIN SCLK SDAT
VOUT
C4
4.7mF
C1
I²C Interface
1mF ^{On/Off, Digital Dimming}
Figure 1. Typical Application for Sub and Main
95
90
4 Main LED - 15 mA,
V_F = 3.1 V
85
80
75
70
65
60
55
50
3 3.5 4 4.5 5 5.5 6
V_I - Input Voltage - V
Figure 2. Efficiency vs Input Voltage
ORDERING INFORMATION⁽¹⁾
PART NUMBER
TPS60250RTE
PACKAGE
16 Pin 3 mm × 3 mm QFN (RTE)
T_A
–40°C to +85°C
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
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 © 2007, Texas Instruments Incorporated