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FEATURES

DESCRIPTION

APPLICATIONS

Efficiency-%

3 3.5 4 4.5 5 5.5 6

V -InputVoltage-V

4MainLED-15mA,V =3.1V

C 1+

SDAT DS1 DS 2 DM5

VIO

GND

NC-G

DM1DM 2DM3DM4IS

ENA

GND

C 2+

C2-

C 1-

VOUT

VIN

MainDisplay

C 1

4.7

4.7uF

1uF

SubDisplay

SCLK

CInterface

1.8VforI /O

Input

Auxiliary PortforKey Pad

orFlash Light

TPS60251

SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007

www.ti.com

HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I

C INTERFACE

• PDA, PMP, GPS (Up To 4 Inch Display)

• Multidisplay Handheld Devices

• 3.0-V to 6.0-V Input Voltage Range

• × 1 and × 1.5 Charge Pump

• Fully Programmable Current with I

The TPS60251 is a high efficiency, constant

– 64 Dimming Steps with 25mA Maximum

frequency charge pump DC/DC converter that uses a

(Sub and Main Display Banks)

dual mode 1 × and 1.5 × conversion to maximize

– 4 Dimming Steps with 80mA Maximum

efficiency over the input voltage range. It drives up to

(DM5 for Auxiliary Application)

five white LEDs for a main display and up to two

white LEDs for a sub display with regulated constant

• 2% Current Matching for Sub LEDs at Light

current for uniform intensity. By utilizing adaptive

Load Condition (Each 100 µ A)

1 × /1.5 × charge pump modes and very low-dropout

• 750-kHz Charge Pump Frequency

current regulators, the TPS60251 achieves high

• Continuous 230-mA Maximum Output Current

efficiency over the full 1-cell lithium-battery input

voltage range.

• Auto Switching Between × 1 and × 1.5 Mode for

Maximum Efficiency

Four enable inputs, ENmain, ENsub1, ENsub2, and

ENaux, available through I

C, are used for simple

• Built-in Soft Start and Current Limit

on/off controls for the main, sub1, sub2, and DM5

• Hardware Enable/Disable

displays, respectively. To lower operating current

• Open Lamp Detection

when using one sub display LED, the device provides

• 24-Pin 4mm x 4mm QFN

independent operation in sub display LEDs.

The TPS60251 is available in a 24-pin 4mmx4mm

thin QFN.

• Cellular Phones

Figure 1. Typical Application for Sub and Main Figure 2. Efficiency vs Input Voltage

ORDERING INFORMATION

(1)

PART NUMBER PACKAGE T

TPS60251RTW 24 Pin 4 mm × 4 mm QFN (RTW) – 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.

Summary of content (27 pages)

PAGE 1
TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 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.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 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) VALUE UNIT –0.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) VI = 3.5 V, TA = –40°C to 85°C, RIS = 562 kΩ, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS VUVLO2 UVLO Threshold voltage2 (2) VI falling Vhys Under-voltage lockout hysterisis UVLO1 VENA_H Enable high threshold voltage VENA_L Enable low threshold voltage TS Soft start time (3) MIN TYP MAX 1.2 1.3 1.5 210 1.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) VI = 3.5 V, TA = –40°C to 85°C, RIS = 562 kΩ, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS tsu(STO) STOP condition setup time t(BUF) Bus free time MIN TYP MAX UNIT 600 ns 1300 ns 2 I C COMPATIBLE INTERFACE VOLTAGE SPECIFICATION (SCLK, SDAT, VIO) VIO Serial bus voltage level VIL Low-leveI input voltage 3.0V ≤ VI ≤ 6.0V, 1.4 V < VIO < 1.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 TERMINAL FUNCTIONS (continued) TERMINAL NAME I/O NO. DESCRIPTION C1– 19 – Connect to the flying capacitor C1 C2+ 20 – Connect to the flying capacitor C2 C2– 21 – Connect to the flying capacitor C2 C1+ 22 – Connect to the flying capacitor C1 VOUT 23 O Connect the anodes of the sub, main, and aux display white LEDs to this pin. Bypass VOUT to GND with a 4.7-µF or greater ceramic capacitor.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 TYPICAL CHARACTERISTICS TABLE OF GRAPHS DESCRIPTION REF Efficiency vs Input Voltage, 4 Main LED - 15mA, 25mA Figure 3 Efficiency vs Input Voltage, 2 Sub LED with Light Load Condition, ×1 Mode Operation Figure 4 Switch Resistance vs Free-Air Temperature, ×1 Mode, ILED = 230 mA Figure 5 Switch Resistance vs Free-Air Temperature, ×1 Mode, ILED = 100 mA Figure 6 Switch Resistance vs Free-Air Temperature, ×1.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 SWITCH RESISTANCE vs FREE-AIR TEMPERATURE (×1 Mode) SWITCH RESISTANCE vs FREE-AIR TEMPERATURE (×1 Mode) 1.15 1.10 1.10 ILED = 230 mA ILED = 100 mA VI = 3.3 V 1.05 VI = 3.3 V Switch Resistance - W Switch Resistance - W 1.05 1 VI = 3.6 V 0.95 0.90 VI = 3.9 V 0.85 1 VI = 3.6 V 0.95 0.90 0.85 0.80 VI = 3.9 V 0.80 0.75 0.75 0.70 0.70 -40 -20 0 20 40 60 0.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 INPUT CURRENT vs SUPPLY VOLTAGE (4 Main LED) SHUTDOWN CURRENT vs INPUT VOLTAGE 10 0.16 0.15 ICC - Input Current - A Shutdown Current - mA 8 6 4 TA = 85°C TA = 25°C TA = -40°C 2 0.14 0.13 0.12 0.11 25 mA 0.10 0.09 0.08 0.07 0.06 15 mA 0.05 0.04 0.03 0.02 2 mA 0.01 0 3 6 5 4 3 4 5 Figure 9. Figure 10. DM5 CURRENT vs INPUT VOLTAGE (Programmed with 80 mA) WLED CURRENT vs INPUT VOLTAGE (4 Main LED with 15 mA) 0.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 APPLICATION INFORMATION APPLICATION OVERVIEW Most of the current handsets fall into one of three categories. First is the clamshell design, with a main display on the inside, a secondary display on the outside and a keypad backlight. Second is the bar design, with a main display and a keypad backlight. Third is the slide type (slide-up and slide-down) design, with a main display and two keypad banks (inside and outside).
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 VA VO VI VF CP WLED Driver VDX VI x1 Operating Area x1.5 Operating Area VHYS VB VC Figure 13. Input Voltage Hysteresis Between ×1 and ×1.5 Mode As shown in Figure 13, there is input voltage hysteresis voltage between 1× and 1.5× mode to ensure stable operation during mode transition. For the 1 cell Li-Ion battery input voltage range, the TPS60251 operates in 1× mode when a fully charged battery is installed.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 auxiliary output. Using the I2C interface, the user may assign DM5 to the main display bank with up to 25-mA current or as an auxiliary output for torch or keypad light or low/weak camera flash with 80-mA current. DM5 has 64 dimming steps which is the main and sub display banks when assigned to the main display. However, it has its own current programming register and enable control.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 ILED(mA) + ƪǒ 1.254 ) 1.276 R IS 10 *6 Ǔ ƫ ǒ Step 500 * 1.254 ) 1.276 R IS 3.5 10 *6 10 *6 Ǔ 1714.29 10 6 (1) Where RIS is the resistor from IS to GND, ILED is the LED current in µA and Step is the dimming step set by the I2C interface (1 to 63). ILED may be set up to 25mA (RIS = 562 kΩ). RIS has an effect on the current steps that are programmed using the I2C. When the current is programmed below 1.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 RIS also affects the current for the auxiliary application. The four current levels (20%, 40%, 70%, and 100%) are determined by the following equations: ƪǒ ƪǒ ƪǒ ƪǒ I AUX(100%) + I AUX(70%) + I AUX(40%) + I AUX(20%) + 1.254 ) 1.276 R IS 10*6 Ǔ ƫ ƫ ƫ ƫ 8000 3.5 10 *6 Ǔ 6000 3.5 10 *6 Ǔ 4000 3.5 10 *6 Ǔ 2000 3.5 10 *6 1.254 ) 1.276 R IS 10*6 1.254 ) 1.276 R IS 10*6 1.254 ) 1.276 R IS 10*6 10 (3) 9.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 CE DATA CLK S P START Condition STOP Condition Figure 16. START and STOP Conditions SCLK ... SDAT A6 A5 Start A4 ... ... A0 R/W AC K 0 0 R7 R6 R5 ... R0 ... AC K D7 D6 D5 ...D0 0 Slave Address AC K 0 Register Address Data Stop NOTE: SLAVE=TPS60251 Figure 17. Serial I/F READ From TPS60251: Protocol A SCLK SDAT ... A6 .. A0 ... R/W AC K 0 0 R7 .. R0 ... AC K A6 .. A0 ...
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TPS60251 www.ti.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 Aux Output Brightness and Operation Mode Control Register (Address: 0x03h) AUX DISP CURRENT B7 B6 B5 B4 B3 B2 B1 B0 BIT NAME Iaux5 Iaux4 Iaux3 Iaux2 Iaux1 Iaux0 Mode1 Mode0 Bits 7 - 2 (DM5 set to Main Display Mode) Iaux5 - Iaux0 (total 64 steps) 6-Bit command (64 steps) to these bits sets the current for DM5. For LED currents between 0 and 1.5mA, one step = 0.1mA increment For LED currents between 1.5 and 25.
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TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 APPLICATION CIRCUITS Main Display R1 562 kW GND IS C1- DM4 DM3 DM2 DM1 NC C2+ C2 C3 1 mF 1 mF NC-G C2- GND C1+ GND VOUT C4 4.7 mF 4.7 mF C1 VIN NC VIO SDAT ENA DS1 DS2 DM5 SCLK 1.8V for I/O Input I2C Interface Sub Display Figure 20. The Typical Application Circuit for Sub and Main Display As shown in Figure 20, this is a typical application circuit for a clam shell phone with 5 main LEDs and 2 sub LEDs.
PAGE 18
TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 Main Display R1 562 kW GND IS C1- DM4 DM3 DM2 DM1 NC NC-G C2+ C2 1 mF C3 1 mF C2- GND C1+ GND NC VOUT C4 4.7 mF 4.7 mF C1 VIN Auxiliary Port for Key Pad or Flash Light VIO SDAT ENA DS1 DS2 DM5 330 W SCLK 1.8V for I/O Input I2C Interface Sub Display Figure 21. The Typical Application Circuit for Sub, Main, and Keypad Backlight Figure 21 shows the typical application circuit for sub, main, and keypad backlight.
PAGE 19
TPS60251 www.ti.com SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007 Revision History Changes from Revision B (October 2007) to Revision C ............................................................................................... Page • Changed LED to LED Current matching typ value from ±1% to ±0.1% ................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 28-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS60251RTWR WQFN RTW 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS60251RTWT WQFN RTW 24 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 28-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS60251RTWR WQFN RTW 24 3000 367.0 367.0 35.0 TPS60251RTWT WQFN RTW 24 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.