TPS60250
TPS60252
www.ti.com............................................................................................................................................................ SLVS769C–APRIL 2007–REVISED APRIL 2008
HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE
1
FEATURES
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3.0 V to 6.0 V Input Voltage Range
DESCRIPTION
×1 and ×1.5 Charge Pump
Fully Programmable Current with I2C
The TPS60250/2 are high efficiency, constant
frequency charge pump DC/DC converters that use
dual mode 1× and 1.5× conversions to maximize
efficiency over the input voltage range. The devices
drive up to five white LEDs for the main display and
up to two white LEDs for the 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 TPS60250/2
achieve high efficiency over the full 1-cell
lithium-battery input voltage range.
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64 Dimming Steps with 25mA Maximum
(Sub and Main Display Banks)
–
4 Dimming Steps with 80mA Maximum
(DM5 for Auxiliary Application)
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2% Current Matching for Sub LEDs at Light
Load Condition (Each 100µA)
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750 kHz Charge Pump Frequency
Continuous 230mA Maximum Output Current
Four enable inputs, ENmain, ENsub1, ENsub2, and
ENaux, available through the I2C, are used for simple
on/off controls for the independent main, sub1, sub2,
and DM5 displays, respectively. To lower the
operating current when using one sub display LED,
the devices provide completely separate operation for
the sub display LEDs.
Auto Switching Between ×1 and ×1.5 Mode for
Maximum Efficiency
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Built-in Soft Start and Current Limit
Open Lamp Detection
16-Pin 3mm x 3mm QFN
TPS60250 (I2C Slave Address: 1110111)
TPS60252 (I2C Slave Address: 1110110)
The TPS60250/2 are available in a 16-pin 3mm x
3mm thin QFN.
APPLICATIONS
Main Display
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Cellular Phones
PDA, PMP, GPS (Up To 4 Inch LCD Display)
Multidisplay Handheld Devices
DM4 DM3 DM2
DM1
GND
C1-
95
4 Main LED - 15 mA,
90
Sub Display
V
= 3.1 V
C2+
C2-
DS2
F
85
80
75
C2 C3
1mF 1mF
DS1
DM5
C1+
VIN SCLK
SDAT
70
65
60
55
VOUT
C4
4.7mF
I2C Interface
On/Off, Digital Dimming
C1
4.7mF
50
4
4.5
5
5.5
3
3.5
6
Figure 2. Typical Application for Sub and Main
V
- Input Voltage - V
I
Figure 1. Efficiency vs Input Voltage
ORDERING INFORMATION(1)
PART NUMBER
PACKAGE
TA
TPS60250RTE
16-Pin 3 mm × 3 mm QFN (RTE)
–40°C to +85°C
TPS60252RTE
(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.
1
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.
Copyright © 2007–2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.