Texas Instruments TPS61041, TPS61040 User Manual

3

2

4

5

DDC, DBV PACKAGE

(Top View)

1

SW

GND

FB

V

IN

EN

GND SW

V

IN

NC

EN FB

3

2

1

4

5

6

DRV PACKAGE

(Top View)

70

72

74

76

78

80

82

84

86

88

90

0.1 1 10 100

VI = 5 V

VI = 3.6 V

VI = 2.4 V

EFFICIENCY

vs

OUTPUT CURRENT

IO − Output Current − mA

Efficiency − %

V

IN

SW

FB

EN

GND

L1

10 µH

D1

R1

R2

C

FF

C

O

1 µF

V

OUT

VIN to 28 V

V

IN

1.8 V to 6 V

C

IN

4.7 µF

5

4

2

3

1

VO = 18 V

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TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGES

Check for Samples: TPS61040, TPS61041

1

FEATURES

• 1.8-V to 6-V Input Voltage Range

• Adjustable Output Voltage Range up to 28 V

• 400-mA (TPS61040) and 250-mA (TPS61041)
Internal Switch Current

• Up to 1-MHz Switching Frequency

• 28-mA Typical No-Load Quiescent Current

• 1-mA Typical Shutdown Current

• Internal Soft Start

• Available in SOT23-5, TSOT23-5,
and 2 × 2 × 0.8-mm SON Packages

APPLICATIONS

• LCD Bias Supply

• White-LED Supply for LCD Backlights

• Digital Still Camera

• PDAs, Organizers, and Handheld PCs

• Cellular Phones

• Internet Audio Player

• Standard 3.3-V/5-V to 12-V Conversion

DESCRIPTION

The TPS61040/41 is a high-frequency boost
converter dedicated for small to medium LCD bias
supply and white LED backlight supplies. The device
is ideal to generate output voltages up to 28 V from a
dual cell NiMH/NiCd or a single cell Li-Ion battery.
The part can also be used to generate standard

3.3-V/5-V to 12-V power conversions.
The TPS61040/41 operates with a switching

frequency up to 1 MHz. This allows the use of small
external components using ceramic as well as
tantalum output capacitors. Together with the thin
SON package, the TPS61040/41 gives a very small
overall solution size. The TPS61040 has an internal
400 mA switch current limit, while the TPS61041 has
a 250-mA switch current limit, offering lower output
voltage ripple and allows the use of a smaller form
factor inductor for lower power applications. The low
quiescent current (typically 28 mA) together with an
optimized control scheme, allows device operation at
very high efficiencies over the entire load current
range.

TYPICAL APPLICATION

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.

Copyright © 2002–2010, Texas Instruments Incorporated

+

+

-

RS Latch

Logic

S

R

Gate

Driver

_

Current Limit

Power MOSFET
N-Channel

R

SENSE

Soft

Start

6 µs Max

On Time

V

REF

= 1.233 V

Error Comparator

400 ns Min

Off Time

Under Voltage

Lockout

Bias Supply

VIN

FB

EN

GND

SW

TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 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.

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Table 1. ORDERING INFORMATION

SWITCH CURRENT PACKAGE

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 website at www.ti.com.

(2) The devices are available in tape and reel and in tubes. Add R suffix to the part number (e.g.,

TPS61040DRVR) to order quantities of 3000 parts in tape and reel or add suffix T (e.g.,
TPS61040DRVT) to order a tube with 250 pieces..

PART NUMBER

TPS61040DBV 400 SOT23-5 PHOI
TPS61040DDC 400 TSOT23-5 QXK
TPS61041DBV 250 SOT23-5 PHPI
TPS61040DRV 400 SON-6 2×2 CCL
TPS61041DRV 250 SON-6 2×2 CAW

(2)

LIMIT, mA MARKING

(1)

PACKAGE

FUNCTIONAL BLOCK DIAGRAM

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Product Folder Link(s): TPS61040 TPS61041

I

peak(typ)

+ I

LIM

)

V

IN

L

100 ns

I

peak(typ)

+ 400 mA )

V

IN

L

100 ns for the TPS61040

I

peak(typ)

+ 250 mA )

V

IN

L

100 ns for the TPS61041

TPS61040
TPS61041

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Table 2. Terminal Functions

TERMINAL

NAME DRV NO.

EN 4 3 I mode reducing the supply current to less than 1 mA. This pin should not be left floating and needs

FB 3 4 I
GND 2 1 – Ground

NC – 5 – No connection
SW 1 6 I
V

IN

DDC,

DBV NO.

5 2 I Supply voltage pin

I/O DESCRIPTION

This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown
to be terminated.

This is the feedback pin of the device. Connect this pin to the external voltage divider to program
the desired output voltage.

Connect the inductor and the Schottky diode to this pin. This is the switch pin and is connected to
the drain of the internal power MOSFET.

DETAILED DESCRIPTION

OPERATION

The TPS61040/41 operates with an input voltage range of 1.8 V to 6 V and can generate output voltages up to
28 V. The device operates in a pulse-frequency-modulation (PFM) scheme with constant peak current control.
This control scheme maintains high efficiency over the entire load current range, and with a switching frequency
up to 1 MHz, the device enables the use of very small external components.

The converter monitors the output voltage, and as soon as the feedback voltage falls below the reference voltage
of typically 1.233 V, the internal switch turns on and the current ramps up. The switch turns off as soon as the
inductor current reaches the internally set peak current of typically 400 mA (TPS61040) or 250 mA (TPS61041).
See the Peak Current Control section for more information. The second criteria that turns off the switch is the
maximum on-time of 6 ms (typical). This is just to limit the maximum on-time of the converter to cover for extreme
conditions. As the switch is turned off the external Schottky diode is forward biased delivering the current to the
output. The switch remains off for a minimum of 400 ns (typical), or until the feedback voltage drops below the
reference voltage again. Using this PFM peak current control scheme the converter operates in discontinuous
conduction mode (DCM) where the switching frequency depends on the output current, which results in very high
efficiency over the entire load current range. This regulation scheme is inherently stable, allowing a wider
selection range for the inductor and output capacitor.

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

PEAK CURRENT CONTROL

The internal switch turns on until the inductor current reaches the typical dc current limit (I
(TPS61040) or 250 mA (TPS61041). Due to the internal propagation delay of typical 100 ns, the actual current
exceeds the dc current limit threshold by a small amount. The typical peak current limit can be calculated:

The higher the input voltage and the lower the inductor value, the greater the peak.
By selecting the TPS61040 or TPS61041, it is possible to tailor the design to the specific application current limit

requirements. A lower current limit supports applications requiring lower output power and allows the use of an
inductor with a lower current rating and a smaller form factor. A lower current limit usually has a lower output
voltage ripple as well.

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Product Folder Link(s): TPS61040 TPS61041

) of 400 mA

LIM

(1)

I

LIM

4

I

LIM

2

TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

SOFT START

All inductive step-up converters exhibit high inrush current during start-up if no special precaution is made. This
can cause voltage drops at the input rail during start up and may result in an unwanted or early system shut
down.

The TPS61040/41 limits this inrush current by increasing the current limit in two steps starting from for 256

cycles to for the next 256 cycles, and then full current limit (see Figure 14).

ENABLE

Pulling the enable (EN) to ground shuts down the device reducing the shutdown current to 1 mA (typical).
Because there is a conductive path from the input to the output through the inductor and Schottky diode, the
output voltage is equal to the input voltage during shutdown. The enable pin needs to be terminated and should
not be left floating. Using a small external transistor disconnects the input from the output during shutdown as
shown in Figure 18.

UNDERVOLTAGE LOCKOUT

An undervoltage lockout prevents misoperation of the device at input voltages below typical 1.5 V. When the
input voltage is below the undervoltage threshold, the main switch is turned off.

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THERMAL SHUTDOWN

An internal thermal shutdown is implemented and turns off the internal MOSFETs when the typical junction
temperature of 168°C is exceeded. The thermal shutdown has a hysteresis of typically 25°C. This data is based
on statistical means and is not tested during the regular mass production of the IC.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature (unless otherwise noted)

Supply voltages on pin V
Voltages on pins EN, FB
Switch voltage on pin SW
Continuous power dissipation See Dissipation Rating Table

T

Operating junction temperature –40°C to 150°C

J

T

Storage temperature –65°C to 150°C

stg

(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)

IN

(2)

(2)

(1)

UNIT

–0.3 V to 7 V

–0.3 V to VIN+ 0.3 V

30 V

DISSIPATION RATING TABLE

PACKAGE R

DBV 250°C/W 357 mW 3.5 mW/°C 192 mW 140 mW

DDC, DRV 76°C/W 1300 mW 13 mW/°C 688 mW 500 mW

qJA

TA≤ 25°C FACTOR TA= 70°C TA= 85°C

POWER RATING ABOVE POWER RATING POWER RATING

DERATING

TA= 25°C

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TPS61040
TPS61041

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RECOMMENDED OPERATING CONDITIONS

V
V
L Inductor
f Switching frequency
C
C
T
T

(1) See application section for further information.

Input voltage range 1.8 6 V

IN

Output voltage range 28 V

OUT

IN

OUT
A
J

(1)

(1)

Input capacitor
Output capacitor

(1)

(1)

Operating ambient temperature –40 85 °C
Operating junction temperature –40 125 °C

ELECTRICAL CHARACTERISTICS

VIN= 2.4 V, EN = VIN, TA= –40°C to 85°C, typical values are at TA= 25°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

V

IN

I

Q

I

SD

V

UVLO

ENABLE

V

IH

V

IL

I

I

POWER SWITCH AND CURRENT LIMIT

Vsw Maximum switch voltage 30 V
t

off

t

on

R

DS(on)

R

DS(on)

I

LIM

I

LIM

OUTPUT

V

OUT

V

ref

I

FB

V

FB

(1) The line and load regulation depend on the external component selection. See the application section for further information.

Input voltage range 1.8 6 V
Operating quiescent current I

= 0 mA, not switching, VFB= 1.3 V 28 50 mA

OUT

Shutdown current EN = GND 0.1 1 mA
Under-voltage lockout threshold 1.5 1.7 V

EN high level input voltage 1.3 V
EN low level input voltage 0.4 V
EN input leakage current EN = GND or V

IN

Minimum off time 250 400 550 ns
Maximum on time 4 6 7.5 ms
MOSFET on-resistance VIN= 2.4 V; ISW= 200 mA; TPS61040 600 1000 mΩ
MOSFET on-resistance VIN= 2.4 V; ISW= 200 mA; TPS61041 750 1250 mΩ
MOSFET leakage current VSW= 28 V 1 10 mA
MOSFET current limit TPS61040 350 400 450 mA
MOSFET current limit TPS61041 215 250 285 mA

Adjustable output voltage range V
Internal voltage reference 1.233 V
Feedback input bias current VFB= 1.3 V 1 mA
Feedback trip point voltage 1.8 V ≤ VIN≤ 6 V 1.208 1.233 1.258 V

Line regulation
Load regulation

(1)

(1)

1.8 V ≤ VIN≤ 6 V; V
CFF= not connected

VIN= 2.4 V; V

= 18 V; 0 mA ≤ I

OUT

OUT

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

MIN TYP MAX UNIT

2.2 10 mH

4.7 mF

1 mF

0.1 1 mA

IN

= 18 V; I

= 10 mA;

load

≤ 30 mA 0.15 %/mA

OUT

0.05 %/V

1 MHz

28 V

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Product Folder Link(s): TPS61040 TPS61041

Efficiency − %

70

72

74

76

78

80

82

84

86

88

90

0.1 1 10 100

VI = 5 V

VI = 3.6 V

VI = 2.4 V

IO − Output Current − mA

VO = 18 V

70

72

74

76

78

80

82

84

86

88

90

0.1 1 10 100

TPS61040

TPS61041

IL − Load Current − mA

L = 10 µH
VO = 18 V

Efficiency − %

TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

TYPICAL CHARACTERISTICS

h Efficiency

I

Q

V

FB

I

SW

I

CL

R

DS(on)

Quiescent current vs Input voltage and temperature 5
Feedback voltage vs Temperature 6
Switch current limit vs Temperature 7

Switch current limit

R

DS(on)

Line transient response 12
Load transient response 13
Start-up behavior 14

EFFICIENCY EFFICIENCY

OUTPUT CURRENT LOAD CURRENT

vs Load current 1, 2, 3
vs Input voltage 4

vs Supply voltage, TPS61041 8
vs Supply voltage, TPS61040 9
vs Temperature 10
vs Supply voltage 11

vs vs

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Table 3. Table of Graphs

FIGURE

Figure 1. Figure 2.

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70

72

74

76

78

80

82

84

86

88

90

0.1 1 10

100

L = 10 µH

L = 3.3 µH

IL − Load Current − mA

VO = 18 V

Efficiency − %

70

72

74

76

78

80

82

84

86

88

90

1 2 3 4 5 6

IO = 10 mA

IO = 5 mA

VI − Input Voltage − V

L = 10 µH

VO = 18 V

Efficiency − %

1.23

1.232

1.234

1.236

1.238

1.24

−40 −20 0 20 40 60 80 100 120

VCC = 2.4 V

TA − Temperature − °C

V

FB

− Feedback Voltage − V

0

5

10

15

20

25

30

35

40

1.8 2.4 3 3.6 4.2 4.8 5.4 6
VI − Input Voltage − V

TA = 85°C

TA = 27°C

TA = −40°C

Quiescent Current − µA

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TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

EFFICIENCY EFFICIENCY

vs vs

LOAD CURRENT INPUT VOLTAGE

Figure 3. Figure 4.

TPS61040

QUIESCENT CURRENT FEEDBACK VOLTAGE

vs vs

INPUT VOLTAGE FREE-AIR TEMPERATURE

Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 7

Figure 5. Figure 6.

Product Folder Link(s): TPS61040 TPS61041

230

250

270

290

310

330

350

370

390

410

430

−40−30−20 −10 0 10 20 30 40 50 60 70 80 90

TPS61040

TPS61041

TA − Temperature − °C

I

(SW)

− Switch Current Limit − mA

240

242

244

246

248

250

252

254

256

258

260

1.8 2.4 3 3.6 4.2 4.8 5.4 6

VCC − Supply Voltage − V

TA = 27°C

I

(CL)

− Current Limit − mA

0

200

400

600

800

1000

1200

−40−30 −20−10 0 10 20 30 40 50 60 70 80 90
TA − Temperature − °C

TPS61041

TPS61040

r

DS(on)

− Static Drain-Source On-State Resistance − mΩ

380

385

390

395

400

405

410

415

420

1.8 2.4 3 3.6 4.2 4.8 5.4 6
VCC − Supply Voltage − V

TA = 27°C

I

(CL)

− Current Limit − mA

TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

TPS61040/41 TPS61041

SWITCH CURRENT LIMIT CURRENT LIMIT

vs vs

FREE-AIR TEMPERATURE SUPPLY VOLTAGE

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Figure 7. Figure 8.

TPS61040 TPS61040/41

CURRENT LIMIT STATIC DRAIN-SOURCE ON-STATE RESISTANCE

vs vs

SUPPLY VOLTAGE FREE-AIR TEMPERATURE

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Figure 9. Figure 10.

Product Folder Link(s): TPS61040 TPS61041

V

I

2.4 V to 3.4 V

V

O

100 mV/div

200 µS/div

VO = 18 V

0

100

200

300

400

500

600

700

800

900

1000

1.8 2.4 3 3.6 4.2 4.8 5.4 6
VCC − Supply Voltage − V

TPS61041

TPS61040

r

DS(on)

− Static Drain-Source On-State Resistance − mΩ

V

O

5 V/div

EN

1 V/div

I

I

50 mA/div

VO = 18 V

V

O

1 mA to 10 mA

200 µS/div

V

O

100 mA/div

VO = 18 V

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TPS61040
TPS61041

SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010

TPS61040/41

STATIC DRAIN-SOURCE ON-STATE RESISTANCE

vs

SUPPLY VOLTAGE

Figure 11. Figure 12. Line Transient Response

Figure 13. Load Transient Response Figure 14. Start-Up Behavior

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Product Folder Link(s): TPS61040 TPS61041