TEXAS INSTRUMENTS TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 Technical data

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FB

PG

VIN

8

LBO

GND

SYNC

EN

LBI

PGND

TPS62052

SW

1

6

7

3

2

9

5

4

10

Ci = 10 µF

Co = 22 µF

VO = 1.5 V / 800 mA

L1 = 10 µHVI = 3.3 V to 10 V

TYPICAL APPLICATION CIRCUIT

IO – Output Current – mA

50

30

10

0.01 0.1 1 10

Efficiency – %

60

70

TPS62050

EFFICIENCY

vs

OUTPUT CURRENT

100

100 1 k

80

20

0

40

90

V

I

= 7.2 V,

VO = 5 V,
SYNC = L

TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

800-mA SYNCHRONOUSSTEP-DOWN CONVERTER

FEATURES DESCRIPTION

• High-Efficiency Synchronous Step-Down

Converter With up to95% Efficiency

• 12-A Quiescent Current (Typ) for systems powered from a 1-cell or 2-cell Li-Ion

• 2.7-V to 10-V OperatingInput Voltage Range

• Adjustable Output Voltage RangeFrom 0.7 V

to 6 V

• Fixed Output Voltage OptionsAvailable in

1.5 V, 1.8 V,and 3.3 V

• Synchronizable to External ClockSignal up to

1.2 MHz

• High Efficiency Over aWide Load Current

Range in Power-Save Mode

• 100% Maximum Duty Cyclefor Lowest

Dropout

• Low Noise Operation inForced Fixed

Frequency PWM Operation Mode

• Internal Softstart

• Overtemperature and Overcurrent Protected

• Available in 10-Pin MicrosmallOutline

Package MSOP

The TPS6205x devices are a family of high-efficiency
synchronous step-down dc/dc converters ideally suited

battery or from a 3-cell to 5-cell NiCd, NiMH, or alkaline
battery.

The TPS62050 is a synchronous PWM converter with
integrated N-channel and P-channel power MOSFET
switches. Synchronous rectification increases ef­ficiency and reduces external component count. To
achieve highest efficiency over a wide load current
range, the converter enters a power-saving
pulse-frequency modulation (PFM) mode at light load
currents. Operating frequency is typically 850 kHz,
allowing the use of small inductor and capacitor values.
The device can be synchronized to an external clock
signal in the range of 600 kHz to 1.2 MHz. For low noise
operation, the converter can be programmed into
forced-fixed frequency in PWM mode. In shutdown
mode, the current consumption is reduced to less than
2 µA. The TPS6205x is available in the 10-pin (DGS)
micro-small outline package (MSOP) and operates
over an free air temperature range of -40°C to 85°C.

APPLICATIONS

• Cellular Phones

• Organizers, PDAs, and HandheldPCs

• Low Power DSP Supply

• Digital Cameras and HardDisks

MATHCAD is a trademark of Mathsoft Incorporated.

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 tospecifications per the terms ofTexas Instruments
standard warranty. Production processing does not necessarily in­cludetestingof allparameters.

Copyright © 2002 – 2003, Texas Instruments Incorporated

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TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

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.

PACKAGE/ORDERING INFORMATION

PACKAGED DEVICES

PLASTIC MSOP

TPS62050DGS Adjustable 0.7 V to 6 V Standard BFM

TPS62051DGS Adjustable 0.7 V to 6 V Enhanced BGB

TPS62052DGS 1.5 V Standard BGC

TPS62054DGS 1.8 V Standard BGE

TPS62056DGS 3.3 V Standard BGG

(1)

The DGS packages are available taped and reeled. Add an R suffix to the device type (i.e., TPS62050DGSR) to order quantities of
2500 devices per reel.

(1)

(DGS)

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

Supply voltage, V

Voltage at EN, SYNC -0.3 V to V

Voltage at LBI, FB, LBO, PG -0.3 V to 7 V

Voltage at SW -0.3 V to 11 V

Output current, I

Maximum junction temperature, T

Operating free-air temperature range, T

Storage temperature range, T

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 300°C

(1)

Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.

(2)

The voltage at the SW pin is sampled in PFM mode 15 µs after the PMOS has switched off. During this time the voltage at SW is
limited to 7 V maximum. Therefore, the output voltage of the converter is limited to 7 V maximum.

I

O

J

stg

OUTPUT VOLTAGE LBI/LBO FUNCTIONALITY PACKAGE MARKING

(1)

TPS6205x

-0.3 V to 11 V

850 mA

150°C

A

-40°C to 85°C

-65°C to 150°C

I

(2)

PACKAGE DISSIPATION RATING

PACKAGE

10-PIN MSOP

(1)

The thermal resistance junction to ambient soldered onto a PCB of the 10-pin MSOP is 180°C/W.

(1)

TA≤ 25°C DERATING FACTOR TA= 70°C TA= 85°C

POWER RATING TA≤ 25°C POWER RATING POWER RATING

555 mW 5.56 mW/°C 305 mW 221 mW

RECOMMENDED OPERATING CONDITIONS

MIN NOM MAX UNIT

Supply voltage at V

Voltage at PG, LBO 6 V

Maximum output current 800

Operating junction temperature -40 125 °C

(1)

Assuming no thermal limitation

2

I

2.7 10 V

(1)

mA

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TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

ELECTRICAL CHARACTERISTICS

VI=7.2 V, VO= 3.3 V, IO= 300 mA, EN = VI, TA=-40°C to 85°C unless otherwise noted

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

V

I

I

(Q)

I

(SD)

I

Q(LBI)

ENABLE

V

IH

V

IL

I

lkg

I

(EN)

V

(UVLO)

POWER SWITCH

r

DS(on)

r

DS(on)

POWER GOOD OUTPUT, LBI, LBO

V

(PG)

V

OL

V

(LBI)

V

(LBI,HYS)

I

lkg(LBI)

OSCILLATOR

f

S

f

(SYNC)

V

IH

V

IL

I

lkg

OUTPUT

V

O

V

(FB)

Input voltage range 2.7 10 V

Operating quiescent current 12 20 µA

Shutdown current µA

IO= 0 mA, SYNC = GND,
VI= 7.2 V

EN = GND 1.5 5

EN = GND, TA=25°C 1.5 3

Quiescent current with enhanced LBI EN = VI, LBI=GND,
comparator version. TPS62051 only

EN high level input voltage 1.3 V

EN low level input voltage 0.3 V

EN trip point hysteresis 100 mV

EN input leakage current EN = GND or VIN, VI=7.2 V 0.01 0.2 µA

EN input current 0.6 V ≤ V

≤ 4 V 2 µA

(EN)

Undervoltage lockout threshold 1.6 V

P-channel MOSFET on-resistance mΩ

VI≥ 5.4 V; IO= 300 mA 400 650

VI= 2.7 V; IO= 300 mA 600 850

P-channel MOSFET leakage current VDS= 10 V 1 µA

P-channel MOSFET current limit VI= 7.2V, VO= 3.3 V 1000 1200 1400 mA

N-channel MOSFET on-resistance mΩ

VI≥ 5.4 V; IO= 300 mA 300 450

VI= 2.7 V; IO= 300 mA 450 550

N-channel MOSFET leakage current VDS= 6 V 1 µA

Power good trip voltage Vml -2% V

Power good delay time

PG, LBO output low voltage 0.3 V

PG, LBO output leakage current 0.01 0.25 µA

VOramping positive 50 µs

VOramping negative 200

V

= 0.8 x VOnominal,

(FB)

I

= 1 mA

(sink)

V

= VOnominal,

(FB)

V

= V

(LBI)

I

Minimum supply voltage for valid power
good, LBO signal

Low battery input trip voltage Input voltage falling 1.21 V

Low battery input trip point accuracy 1.5%

Low battery input hysteresis 15 mV

LBI leakage current 0.01 0.1 µA

Oscillator frequency 600 850 1000 kHz

Synchronization range 600 1200 kHz

SYNC high level input voltage 1.5 V

SYNC low level input voltage 0.3 V

SYNC input leakage current SYNC = GND or VIN 0.01 0.1 µA

SYNC trip point hysteresis 100 mV

Duty cycle of external clock signal 20% 90%

Adjustable output voltage TPS62050,
range TPS62051

Feedback voltage 0.5 V

FB leakage current 0.02 0.1 µA

TPS62050,
TPS62051

TPS62050,
TPS62051

TPS62050, TPS62051

5 µA

2.3 V

0.7 6.0 V

3

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TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

ELECTRICAL CHARACTERISTICS (continued)

VI=7.2 V, VO= 3.3 V, IO= 300 mA, EN = VI, TA=-40°C to 85°C unless otherwise noted

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Feedback voltage TPS62050, VI= 2.7 V to 10 V,
tolerance TPS62051 0 mA< IO< 600 mA

TPS62052 -3% 3%

Fixed output voltage VI= 2.7 V to 10 V,
tolerance

Resistance of internal voltage divider
forfixed-voltage versions

Line regulation 5.2 mV/V

Load regulation VI= 7.2 V; IO= 10 mA to 600 mA 0.0045 %/mA

η Efficiency

Duty cycle range for main switches 100%

Minimum tontime for main switch 100 ns

Shutdown temperature 145 °C

Start-up time 1 ms

(1)

The worst case r

(1)

of the PMOS in 100% mode for an input voltage of 3.3 V is 0.75 Ω. This value can be used to determine the

DS(on)

TPS62054 -3% 3%

TPS62056 -3% 3%

minimum input voltage if the output current is less than 600 mA with the TPS62056.

VI= 2.7 V to 10 V,
0 mA< IO< 600 mA

0 mA< IO< 600 mA

VI= 3.75 V to 10 V,
0 mA< IO< 600 mA

VO= 3.3 V, VI= 5 V to 10 V,
IO= 600 mA

VI= 5 V; VO= 3.3 V; IO= 300 mA 93%

VI= 3.6 V; VO= 2.5 V; IO= 200 mA 93%

IO= 200 mA, VI= 5 V, Vo= 3.3 V,
Co= 22 µF, L = 10 µH

-3% 3%

700 1000 1300 kΩ

4

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Undervoltage

Lockout

Bias Supply

_

+

+
–

REF

Current Limit Comparator

+
–

REF

I

(AVG)

Comparator

P-Channel
Power MOSFET

N-Channel
Power MOSFET

Driver

Shoot-Through

Logic

+
–

Load Comparator

Control

Logic

+

–

1.21 V

Soft Start

850 kHz

Oscillator

+

–

S
R

Comparator High

Comparator Low

Comparator High2

+

–

Compensation

R2
See Note

R1

V

REF

= 0.5 V

Comparator Low

Comparator Low2

Comparator High

Saw Tooth

Generator

V

I

V

(COMP)

Comparator

SW

PG

LBO

GNDPGNDLBIFB

V

I

EN

SKIP Comparator

Error Amp

SYNC

TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

FUNCTIONAL BLOCK DIAGRAM

6

NOTE: For the adjustable versions (TPS62050, TPS62051), the internal feedback driver is disabled and the FB pin is
directly connected to the GM amplifier.

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PGND

FB

PG

VIN

8

LBO

GND

SYNC

EN

LBI

TPS62050

SW

1

6

7

3

2

9

5

4

10

L1 = 10 µH

VO = 5 V

R1 =
820 kΩ

C

(ff)

= 6.8 pF

R2 = 91 kΩ

Co = 22 µF

Ci = 10 µF

V

I

R5
130 kΩ

R6
100 kΩ

R3
1 MR41 M

TDK

C3216X5R1A106M

Taiyo Yuden
JMK316BJ226ML

WE PD 744 777 10

Quiescent Current Measurements and Efficiency Were Taken
With: R5 = Open, R4 = Open, LBI Connected to GND.

TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

PARAMETER MEASUREMENT INFORMATION

All graphs were generated using the circuit as shown unless otherwise noted. For output voltages other than 5 V,
the fixed voltage versions are used. The resistors R1, R2, and the feedforward capacitor (Cff) are removed and
the feedback pin is directly connected to the output.

STANDARD CIRCUIT FOR ADJUSTABLEVERSION

7

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0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 5.5 V

VI = 6.5 V

VI = 7.2 V

VI = 8.4 V

VI = 10 V

SYNC = L
VO = 5 V
TA = 25°C

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 2.7 V

VI = 3.3 V

VI = 5 V

SYNC = L
VO = 1.5 V
TA = 25°C

VI = 7.2 V

VI = 10 V

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 2.7 V

VI = 3.3 V

VI = 5 V

SYNC = L
VO = 1.8 V
TA = 25°C

VI = 7.2 V

VI = 10 V

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 2.7 V

SYNC = H
VO = 1.5 V
TA = 25°C

VI = 5 V

VI = 3.3 V

VI = 10 V

VI = 7.2 V

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 3.5 V

VI = 5 V

SYNC = L
VO = 3.3 V
TA = 25°C

VI = 10 V

VI = 7.2 V

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100 1 k

IL − Load Current − mA

Efficiency − %

VI = 5.5 V

SYNC = H
VO = 5 V
TA = 25°C

VI = 7.2 V

VI = 6.5 V

VI = 10 V

VI = 8.4 V

TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D–SEPTEMBER 2002 – REVISED OCTOBER 2003

TYPICAL CHARACTERISTICS

TABLE OF GRAPHS

FIGURE

Efficiency vs load current 1 - 8

Switching frequency vs temperature 9

Output voltage ripple in SKIP mode 10

Output voltage ripple in PWM mode 11

Line transient response in PWM mode 12

Load transient 13

V

and IL(inductor current) in skip mode 14

(switch)

Start-up timing 15

TPS62050 TPS62052 TPS62054

EFFICIENCY EFFICIENCY EFFICIENCY

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

8

Figure 1. Figure 2.

TPS62056 TPS62050 TPS62052

EFFICIENCY EFFICIENCY EFFICIENCY

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

Figure 4. Figure 5.

Figure 3.

Figure 6.