Document
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
Efficiency - %
95
90
4 Main LED - 15 mA,
VF = 3.1 V
85
80
75
70
65
60
55
50
3 3.5 4 4.5 5 5.5 6 VI - 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)
TA –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
TPS60250 TPS60252
SLVS769C – APRIL 2007 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
VI
Input voltage range (all pins)
MAX Output current limit
HBM ESD Rating (2)
CDM ESD Rating(3)
MM ESD Rating(4)
TA
Operating temperature range
TJ
Maximum operating junction temperature
TST
Storage temperature
VALUE –0.3 to 7
650 2
500 200 –40 to 85 150 –55 to 150
UNIT V mA kV V V °C °C °C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The Human body model (HBM) is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The testing is done according JEDECs EIA/JESD22-A114.
(3) Charged Device Model (4) Machine Model (MM) is a 200pF capacitor discharged through a 500 nH inductor with no series resistor into each pin. The testing is
done according JEDECs EIA/JESD22-A115.
DISSIPATION RATINGS
PACKAGE QFN 3×3 RTE
THERMAL RESISTANCE, RθJC
74.6°C/W
THERMAL RESISTANCE, RθJA
48.7°C/W
TA ≤ 25°C POWER RATING
2.05 W
DERATING FACTOR ABOVE TA = 25°C
1.13 W
TA = 85°C POWER RATING.