TEXAS INSTRUMENTS TPS61160A, TPS61161A Technical data

C1

D1

VIN SW

FB

GND

CTRL

COMP

C2

20mA

TPS61161A

ON/OFF

DIMMING

CONTROL

V 3Vto18V

I

L1

22 Hm

1 Fm

C3

220nF

R

10

set

W

1 Fm

L1: TDKVLCF5020T-220MR75-1
C1:MurataGRM188R61E105K
C2: MurataGRM21BR71H105K
D1:ONsemiMBR0540T1

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................................................................................................................................................................................................... SLVS937 – MARCH 2009

White LED Driver With PWM Brightness Control in 2mm x 2mm

QFN Package for up to 10 LEDs in Series

1

FEATURES

• 2.7V to 18V Input Voltage Range

• 26V Open LED Protection for 6 LEDs

(TPS61160A)
38V Open LED Protection for 10 LEDs

(TPS61161A)

• 200mV Reference Voltage With ± 2% Accuracy

• PWM Interface for Brightness Control

• Built-in Soft Start

• Up to 90% Efficiency

• 2mm × 2mm × 0.8mm 6-pin QFN Package With

Thermal Pad

APPLICATIONS

• Cellular Phones

• Portable Media Players

• Ultra Mobile Devices

• GPS Receivers

• White LED Backlighting for Media Form Factor

Display

TPS61160A
TPS61161A

DESCRIPTION

With a 40-V rated integrated switch FET, the
TPS61160A/61A is a boost converter that drives up
to 10 LEDs in series. The boost converter runs at
600kHz fixed switching frequency to reduce output
ripple, improve conversion efficiency, and allows for
the use of small external components.

The default white LED current is set with the external
sensor resistor Rset, and the feedback voltage is
regulated to 200mV, as shown in the typical
application. During the operation, the LED current can
be controlled by a pulse width modulation (PWM)
signal applied to the CTRL pin through which the duty
cycle determines the feedback reference voltage. In
PWM dimming mode, the TPS61160A/61A does not
burst the LED current; therefore, it does not generate
audible noises on the output capacitor. For maximum
protection, the device features integrated open LED
protection that disables the TPS61160A/61A to
prevent the output from exceeding the absolute
maximum ratings during open LED conditions.

The TPS61160A/61A is available in a space-saving,
2mm × 2mm QFN package with thermal pad.

1

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.

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.

Figure 1. Typical Application of TPS61161A

Copyright © 2009, Texas Instruments Incorporated

TPS61160A
TPS61161A

SLVS937 – MARCH 2009 ...................................................................................................................................................................................................

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.

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(1)

(2)

PACKAGE MARKING

T

A

– 40 ° C to 85 ° C

ORDERING INFORMATION

OPEN LED PROTECTION PACKAGE

26V (typical) TPS61160ADRV OBV
38V (typical) TPS61161ADRV OBT

(1) For the most current package and ordering information, see the TI Web site at www.ti.com .
(2) The DRV package is available in tape and reel. Add R suffix (TPS61160ADRVR) to order quantities of 3000 parts per reel or add T

suffix (TPS61160ADRVT) to order 250 parts per reel.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range (unless otherwise noted)

Supply Voltages on VIN

V

I

P

D

T

J

T

STG

Voltages on CTRL
Voltage on FB and COMP
Voltage on SW

(2)

Continuous Power Dissipation See Dissipation Rating Table
Operating Junction Temperature Range – 40 to 150 ° C
Storage Temperature Range – 65 to 150 ° 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) All voltage values are with respect to network ground terminal.

(2)

(2)

(2)

(1)

VALUE UNIT

– 0.3 to 20 V
– 0.3 to 20 V

– 0.3 to 3 V

– 0.3 to 40 V

DISSIPATION RATINGS

BOARD PACKAGE R

(1)

Low-K

High-K

DRV 20 ° C/W 140 ° C/W 7.1 mW/ ° C 715 mW 395 mW 285 mW

(2)

DRV 20 ° C/W 65 ° C/W 15.4 mW/ ° C 1540 mW 845 mW 615 mW

θ JC

R

θ JA

(1) The JEDEC low-K (1s) board used to derive this data was a 3in × 3in, two-layer board with 2-ounce copper traces on top of the board.
(2) The JEDEC high-K (2s2p) board used to derive this data was a 3in × 3in, multilayer board with 1-ounce internal power and ground planes

and 2-ounce copper traces on top and bottom of the board.

DERATING FACTOR

ABOVE TA= 25 ° C

TA< 25 ° C TA= 70 ° C TA= 85 ° C

RECOMMENDED OPERATING CONDITIONS

MIN TYP MAX UNIT

V
V
L Inductor
f
Duty PWM duty cycle resolution at 10kHz 0.5 %

C
C
T
T

(1) These values are recommended values that have been successfully tested in several applications. Other values may be acceptable in
(2) The device can support the frequency range from 1kHz to 5kHz based on the specification, t

Input voltage range, VIN 2.7 18 V

I

Output voltage range VIN 38 V

O

dim

PWM dimming frequency

(1)

(2)

10 22 µ H

5 100 kHz

at 30kHz 1.5
Input capacitor 1 µ F

IN

Output capacitor

O

Operating ambient temperature – 40 85 ° C

A

Operating junction temperature – 40 125 ° C

J

(1)

0.47 10 µ F

other applications but should be fully tested by the user.

. The output ripple needs to be

considered in the range of 1kHz to 5kHz.

off

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Product Folder Link(s): TPS61160A TPS61161A

TPS61160A
TPS61161A

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ELECTRICAL CHARACTERISTICS

VIN = 3.6 V, CTRL = VIN, TA= – 40 ° C to 85 ° C, typical values are at TA= 25 ° C (unless otherwise noted)

SUPPLY CURRENT

V

I

I

Q

I

SD

UVLO Undervoltage lockout threshold VIN falling 2.2 2.5 V
V

hys

ENABLE AND REFERENCE CONTROL

V

(CTRLh)

V

(CTRLl)

R

(CTRL)

t

off

VOLTAGE AND CURRENT CONTROL

V

REF

V

(REF_PWM)

I

FB

f

S

D

max

t

min_on

I

sink

I

source

G

ea

R

ea

f

ea

POWER SWITCH

R

DS(on)

I

LN_NFET

OC and OLP

I

LIM

I

LIM_Start

t

Half_LIM

V

ovp

V

(FB_OVP)

t

REF

t

step

THERMAL SHUTDOWN

T

shutdown

T

hysteresis

................................................................................................................................................................................................... SLVS937 – MARCH 2009

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Input voltage range, VIN 2.7 18 V
Operating quiescent current into VIN Device PWM switching no load 1.8 mA
Shutdown current CRTL=GND, VIN = 4.2 V 1 µ A

Undervoltage lockout hysterisis 70 mV

CTRL logic high voltage VIN = 2.7 V to 18 V 1.2 V
CTRL logic low voltage VIN = 2.7 V to 18 V 0.4 V
CTRL pull down resistor 400 800 1600 k Ω
CTRL pulse width to shutdown CTRL high to low 2.5 ms

Voltage feedback regulation voltage 196 200 204 mV
Voltage feedback regulation voltage under V

brightness control
Voltage feedback input bias current V

= 50 mV 47 50 53 mV

FB

V

= 20 mV 17 20 23

FB

= 200 mV 2 µ A

FB

Oscillator frequency 500 600 700 kHz
Maximum duty cycle V

= 100 mV 90 93 %

FB

Minimum on pulse width 40 ns
Comp pin sink current 100 µ A
Comp pin source current 100 µ A
Error amplifier transconductance 240 320 400 µ mho
Error amplifier output resistance 6 M Ω
Error amplifier crossover frequency 5 pF connected to COMP 500 kHz

N-channel MOSFET on-resistance VIN = 3.6 V 0.3 0.6

VIN = 3.0 V 0.7

N-channel leakage current V

N-Channel MOSFET current limit D = D
Start up current limit D = D

= 35 V, TA= 25 ° C 1 µ A

SW

max
max

0.56 0.7 0.84 A

0.4 A
Time step for half current limit 5 ms
Open LED protection threshold Measured on the SW pin, TPS61160A 25 26 27 V

TPS61161A 37 38 39

Open LED protection threshold on FB Measured on the FB pin, percentage

of Vref, Vref = 200 mV and 20 mV

V

filter time constant 180 µ s

REF

V

ramp up time 213 µ s

REF

50%

Thermal shutdown threshold 160 ° C
Thermal shutdown threshold hysteresis 15 ° C

Ω

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Product Folder Link(s): TPS61160A TPS61161A

VIN

CTRL

SW

FB

COMP

GND

TOP VIEW

Thermal

Pad

6-PIN2mmx2mmx0.8mmQFN

TPS61160A
TPS61161A

SLVS937 – MARCH 2009 ...................................................................................................................................................................................................

DEVICE INFORMATION

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

VIN 6 I The input supply pin for the IC. Connect VIN to a supply voltage between 2.7V and 18V.
SW 4 I
GND 3 O Ground

FB 1 I Feedback pin for current. Connect the sense resistor from FB to GND.
COMP 2 O

CTRL 5 I

Thermal Pad

I/O DESCRIPTION

This is the switching node of the IC. Connect the inductor between the VIN and SW pin. This pin is also
used to sense the output voltage for open LED protection

Output of the transconductance error amplifier. Connect an external capacitor to this pin to compensate the
regulator.

Control pin of the boost regulator. Enable and disable IC. PWM signal can be applied to the pin for LED
brightness dimming as well.

The thermal pad should be soldered to the analog ground plane. If possible, use thermal via to connect to
ground plane for ideal power dissipation.

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Product Folder Link(s): TPS61160A TPS61161A

SW

Ramp

Generator

Oscillator

Current
Sensor

OLP

CTRL

GND

C3

L1

+

FB

Reference

Control

D1

Error

Amplifer

2

1

Rset

C2

Vin

C1

PWMControl

4

6

Soft

Start-up

5

3

COMP

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................................................................................................................................................................................................... SLVS937 – MARCH 2009

FUNCTIONAL BLOCK DIAGRAM

TPS61160A
TPS61161A

TYPICAL CHARACTERISTICS

TABLE OF GRAPHS

FIGURE

Efficiency TPS61160A/61A VIN = 3.6 V; 4, 6, 8, 10 LEDs; L = 22 µ H Figure 2
Efficiency TPS61160A Figure 3
Efficiency TPS61161A Figure 4

Product Folder Link(s): TPS61160A TPS61161A

= 20 mA; PWM Freq = 10 kHz Figure 8

LOAD

= 20 mA; L = 22 µ H Figure 9

LOAD

= 20 mA; L =22 µ H Figure 10

LOAD

= 20 mA; L = 22 µ H Figure 11

LOAD

Current limit TA= 25 ° C Figure 5
Current limit Figure 6
PWM dimming linearity VIN = 3.6 V; PWM Freq = 10 kHz and 40 kHz Figure 7
Output ripple at PWM dimming 8 LEDs; VIN = 3.6 V; I
Switching waveform 8 LEDs; VIN = 3.6 V; I
Start-up 8 LEDs; VIN = 3.6 V; I
Open LED protection 8 LEDs; VIN = 3.6 V; I

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40

50

60

70

80

90

100

0 10 20 30 40 50

6LEDs- TPS61160A

V =3.6V

I

V =3V

I

V =4.2V

I

OutputCurrent-mA

Efficiency-%

40

50

60

70

80

90

100

0 10 20 30 40 50

OutputCurrent-mA

4(12.8V),6(19.2V)LEDs
8(25.6V),10(32V)LEDs

6LEDs

V =3.6V

I

4LEDs

8LEDs

10LEDs

Efficiency-%

300

400

500

600

700

800

900

1000

20 30 40 50 60 70 80 90

DutyCycle-%

SwitchCurrentLimit-mA

40

50

60

70

80

90

100

0 10 20 30 40 50

10LEDs- TPS61161A

V =5V

I

V =3.6V

I

V =12V

I

OutputCurrent-mA

Efficiency-%

300

400

500

600

700

800

900

1000

-40 -20 0 20 40 60 80 100 120 140

Temperature- C°

SwitchCurrentLimit-mA

0

40

80

120

160

200

0 20 40 60 80 100

PWMDutyCycle-%

10kHz,40kHz

FBVoltage-mV

TPS61160A
TPS61161A

SLVS937 – MARCH 2009 ...................................................................................................................................................................................................

EFFICIENCY EFFICIENCY

vs vs

OUTPUT CURRENT OUTPUT CURRENT

Figure 2. Figure 3.

EFFICIENCY SWITCH CURRENT LIMIT

vs vs

OUTPUT CURRENT DUTY CYCLE

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Figure 4. Figure 5.

SWITCH CURRENT LIMIT FB VOLTAGE

vs vs

TEMPERATURE PWM DUTY CYCLE

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Figure 6. Figure 7.

Product Folder Link(s): TPS61160A TPS61161A