TPS75105

Manufacturer Part NumberTPS75105
DescriptionThe TPS7510x linear low dropout (LDO) matching LED current source is optimized for low power keypad and navigation pad LED backlighting applications
ManufacturerTexas Instruments
TypeLinear
TPS75105 datasheets

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Specifications of TPS75105

TopologyLDOVin(min)(v)2.7
Vin(max)(v)5.5Output Voltage(max)(v)3.6
Led(#)2 x 2Led ConfigurationParallel
Peak Efficiency(%)87Iq(typ)(ma)0.18
Operating Temperature Range(c)-40 to 85Pin/package10SON, 9DSBGA
Iout(max)(a)0.025Vout(min)(v)0.5
Vout(max)(v)3.6Duty Cycle(max)(%)100
Shutdown Current(typ)(ua)0.1Priority(used For Pqs)3
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Low Dropout, Two-Bank LED Driver with PWM Brightness Control
FEATURES
1
•
Regulated Output Current with 2% LED-to-LED
2
Matching
•
Drives Up to Four LEDs at 25mA Each in a
Common Cathode Topology
•
28mV Typical Dropout Voltage Extends Usable
Supply Range in Li-Ion Battery Applications
•
Brightness Control Using PWM Signals
•
Two 2-LED Banks with Independent Enable
and PWM Brightness Control per Bank
•
No Internal Switching Signals—Eliminates EMI
•
Default LED Current Eliminates External
Components
– Default values from 3mA to 10mA (in 1mA
increments) available using innovative
factory EEPROM programming
– Optional external resistor can be used for
high-accuracy, user-programmable current
•
Over-Current and Over-Temperature
Protection
•
Available in Wafer Chip-Scale Package
or 2,5mm × 2,5mm SON-10
APPLICATIONS
•
Keypad and Display Backlighting
•
White and Color LEDs
•
Cellular Handsets
•
PDAs and Smartphones
TPS7510x YFF
9-Ball WCSP
(Top View)
A3
B3
C3
A2
B2
C2
A1
B1
C1
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.
All trademarks are the property of their respective owners.
2
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.
DESCRIPTION
The TPS7510x linear low dropout (LDO) matching
LED current source is optimized for low power
keypad
applications. The device provides a constant current
to up to four unmatched LEDs organized in two banks
of two LEDs each in a common-cathode topology.
Without an external resistor, the current source
defaults to factory-programmable, preset current level
with ±0.5% accuracy (typical). An optional external
resistor can be used to set initial brightness to
user-programmable values with higher accuracy.
Brightness can be varied from off to full brightness by
inputting a pulse width modulation (PWM) signal on
each Enable pin. Each bank has independent enable
and brightness control, but current matching is done
to all four channels concurrently. The input supply
range is ideally suited for single-cell Li-Ion battery
supplies and the TPS7510x can provide up to 25mA
per LED.
No internal switching signals are used, eliminating
troublesome electromagnetic interference (EMI). The
TPS7510x is offered in an ultra-small, 9-ball, 0.4mm
ball-pitch wafer chip-scale package (WCSP) and a
2,5mm × 2,5mm, 10-pin SON package, yielding a
very compact total solution size ideal for mobile
handsets and portable backlighting applications. The
device is fully specified over T
TPS7510x DSK
2,5mm x 2,5mm SON-10
(Top View)
1
10
ENB
I
SET
ENA
2
9
V
IN
D1A
3
GND
8
D1B
D2A
4
7
D2B
5
6
GND
NC
TPS7510x
SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010
and
navigation
pad
LED
backlighting
= –40°C to +85°C.
J
V
BATT
TPS7510x
V
D1A
IN
V
ENA
D2A
ENA
V
ENB
ENB
D1B
D2B
I
SET
Copyright © 2006–2010, Texas Instruments Incorporated

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TPS75105 Summary of contents

  • Page 1

    ... D2B 5 6 GND NC TPS7510x SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010 and navigation pad LED backlighting = –40°C to +85° BATT TPS7510x V D1A IN V ENA D2A ENA V ENB ENB D1B D2B I SET Copyright © 2006–2010, Texas Instruments Incorporated ...

  • Page 2

    ... TPS7510x SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications ...

  • Page 3

    ... Enable pin input current INB ENB t Shutdown delay time SD T Thermal shutdown temperature SD (1) Average of all four I outputs. DX Copyright © 2006–2010, Texas Instruments Incorporated = –40°C to +85°C 3.8V, DxA and DxB = 3.3V +25°C. A TEST CONDITIONS ENA,B DX ...

  • Page 4

    ... SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010 Table 1. Recommended (1% Tolerance) Set Resistor Values R (kΩ) SET 511 255 169 127 102 84.5 73.2 64.9 56.2 51.1 46.4 42.2 39.2 36.5 34.0 32.4 30.1 28.7 26.7 25.5 24.3 23.2 22.1 21.5 20.5 ( × SET SET 4 Submit Documentation Feedback I (mA) SET 2.4 4.8 7.2 9.6 12.0 14.5 16.7 18.9 21.8 24.0 26.4 29.0 31.3 33.6 36.0 37.8 40.7 42.7 45.9 48.0 50.4 52.8 55.4 57.0 59.8 Copyright © 2006–2010, Texas Instruments Incorporated www.ti.com (1) I (mA) DX 1.0 2.0 3.0 4.1 5.0 6.1 7.0 7.9 9.2 10.1 11.1 12.2 13.1 14.1 15.1 15.9 17.1 17.9 19.3 20.2 21.2 22.2 23.3 23.9 25.1 ...

  • Page 5

    ... D2B — 6 Copyright © 2006–2010, Texas Instruments Incorporated PIN ASSIGNMENTS TERMINAL FUNCTIONS INPUT/ OUTPUT DESCRIPTION Enable pin, Bank A. Driving this pin high turns on the current source to Bank A outputs. Driving this pin low turns off the current source to Bank A outputs. An ...

  • Page 6

    ... Set Current SET Sense 6 Submit Documentation Feedback FUNCTIONAL BLOCK DIAGRAM Controlled Current Source Control Logic Controlled Current Source Controlled Current Source Control Logic Controlled Current Source Current Reference GND www.ti.com D1A D2A D1B D2B Copyright © 2006–2010, Texas Instruments Incorporated ...

  • Page 7

    ... Figure 1. LINE TRANSIENT (300mV Pulse) 3.6V 3.3V 1V/div 0.5mA/div 20 s/div m Figure 3. DIMMING RESPONSE (Single Channel) 0.4V 1V/div 20mA/div 20 s/div m Figure 5. Copyright © 2006–2010, Texas Instruments Incorporated TYPICAL CHARACTERISTICS = –40°C to +85°C 3.8V, DxA and DxB = 3.3V 1V/div 0.5mA/div 100 V IN 1V/div 20mA/div ...

  • Page 8

    ... Submit Documentation Feedback = –40°C to +85°C 3.8V, DxA and DxB = 3.3V +25°C. A SET 28 Expanded Range 420 460 500 20 TPS75105 OUTPUT CURRENT vs INPUT VOLTAGE 5.4 5.3 5.2 5.1 5.0 4.9 4.8 4.7 4.6 4.5 5.0 5.5 3.4 OUTPUT CURRENT vs OUTPUT VOLTAGE 20 18 D1B D1A OUT ...

  • Page 9

    ... Solutions using the preset internal current level eliminate an external component, thereby increasing accuracy and reducing cost. Copyright © 2006–2010, Texas Instruments Incorporated SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010 APPLICATIONS INFORMATION LIMITATIONS ON LED FORWARD ...

  • Page 10

    ... Dimming PWM or CPU GPIO Figure 4 and Figure 13. Typical Application Diagram minimize current , IN table). TPS7510x ENA D1A ENB D2A D1B V IN Li-Ion D2B Battery I SET GND R SET (optional) Copyright © 2006–2010, Texas Instruments Incorporated www.ti.com ...

  • Page 11

    ... Changed diode current accuracy parameter, Electrical Characteristics, to reflect YFF and DSK package specifications ........................................................................................................................................................................ • Deleted operating junction temperature range specification from Electrical Characteristics table to eliminate redundancy ........................................................................................................................................................................... Copyright © 2006–2010, Texas Instruments Incorporated SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010 REVISION HISTORY TPS7510x Page ...

  • Page 12

    ... TPS75105DSKR ACTIVE TPS75105DSKT ACTIVE TPS75105YFFR ACTIVE TPS75105YFFT ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 13

    ... Device Package Package Type Drawing TPS75103YFFR DSBGA YFF TPS75103YFFT DSBGA YFF TPS75105DSKR SON DSK TPS75105DSKT SON DSK TPS75105YFFR DSBGA YFF TPS75105YFFT DSBGA YFF PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 9 3000 180.0 8.4 1.45 9 250 180 ...

  • Page 14

    ... Device Package Type TPS75103YFFR DSBGA TPS75103YFFT DSBGA TPS75105DSKR SON TPS75105DSKT SON TPS75105YFFR DSBGA TPS75105YFFT DSBGA PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) YFF 9 3000 YFF 9 250 DSK 10 3000 DSK 10 250 YFF 9 3000 YFF 9 250 ...

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  • Page 18

    X: Max = 1.258 mm, Min = 1.158 mm Y: Max = 1.258 mm, Min = 1.158 mm ...

  • Page 19

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...

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