TPS60250_08 Datasheet, PDF (1/25 Pages) Texas Instruments – HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE

TPS60250
TPS60252
www.ti.com............................................................................................................................................................ SLVS769C – APRIL 2007 – REVISED APRIL 2008
HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I²C INTERFACE
FEATURES
1
• 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 230mA 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
• TPS60250 (I²C Slave Address: 1110111)
• TPS60252 (I²C Slave Address: 1110110)
APPLICATIONS
• Cellular Phones
• PDA, PMP, GPS (Up To 4 Inch LCD Display)
• Multidisplay Handheld Devices
DESCRIPTION
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.
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.
The TPS60250/2 are available in a 16-pin 3mm x
3mm thin QFN.
Main Display
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
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
4.7mF
I²C Interface
On/Off, Digital Dimming
Figure 2. Typical Application for Sub and Main
Figure 1. Efficiency vs Input Voltage
ORDERING INFORMATION⁽¹⁾
PART NUMBER
TPS60250RTE
TPS60252RTE
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.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2008, Texas Instruments Incorporated