Texas Instruments TPS62220DDC, TPS62221DDC, TPS62222DDC, TPS62223DDC, TPS62224DDC Schematic [ru]

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FEATURES DESCRIPTION

APPLICATIONS

V

I

GND

EN

SW

FB

C3

4.7 Fm

L1

4.7 Hm

C4

10 Fm

TPS62220

V

I

2.5 V to 6 V

V

O

1.5 V/400 mA

R1

360 kW

R2

180 kW

C1

22 pF

C2

100 pF

1

2

3

5

4

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

V

O

= 1.8 V,

L = 4.7 H,m

C

O

= 22 Fm

Efficency − %

I

L

− Load Current − mA

V

I

= 3.7 V

Typical Application (Adjustible Output Voltage Version)

V

I

= 5 V

V

I

= 2.7 V

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23

• High-Efficiency Synchronous Step-Down

The TPS6222x devices are a family of high-efficiency,

Converter With up to 95% Efficiency

synchronous step-down converters ideally suited for

portable systems powered by 1-cell Li-Ion or 3-cell

• 2.5-V to 6-V Input Voltage Range

NiMH/NiCd batteries. The devices are also suitable to

• Adjustable Output Voltage Range From 0.7 V

operate from a standard 3.3-V or 5-V voltage rail.

to V

I

With an output voltage range of 6 V down to 0.7 V

• Fixed Output Voltage Options Available

and up to 400-mA output current, the devices are

• Up to 400-mA Output Current

ideal for powering the low voltage TMS320™ DSP

• 1.25-MHz Fixed Frequency PWM Operation

family and processors used in PDAs, pocket PCs,

and smart phones. Under nominal load current, the

• Highest Efficiency Over Wide Load Current

devices operate with a fixed switching frequency of

Range Due to Power-Save Mode

typically 1.25 MHz. At light load currents, the part

• 15-µA Typical Quiescent Current

enters the power-save mode operation; the switching

• Soft Start

frequency is reduced and the quiescent current is

typically only 15 µA; therefore, the device achieves

• 100% Duty Cycle Low-Dropout Operation

the highest efficiency over the entire load current

• Dynamic Output-Voltage Positioning

range. The TPS6222x needs only three small

• Available in TSOT23 Package

external components. Together with the tiny TSOT23

package, a minimum system solution size can be

achieved. An advanced fast response voltage mode

control scheme achieves superior line and load

• PDAs and Pocket PC

regulation with small ceramic input and output

• Cellular Phones, Smart Phones

capacitors.

• OMAP™ and Low Power DSP Supply

• Digital Cameras

• Portable Media Players

• Portable Equipment

• WLAN PC Cards

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.

OMAP, TMS320 are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2006, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATING TABLE

(1)

RECOMMENDED OPERATING CONDITIONS

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

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.

ORDERING INFORMATION

(1)

T

A

OUTPUT VOLTAGE THIN-SOT23 PACKAGE SYMBOL

Adjustable TPS62220DDC ALN

1.5 V TPS62221DDC ALO

1.6 V TPS62224DDC ALQ

1.7 V TPS62229DDC EJ

-40°C to 85°C

1.8 V TPS62222DDC APP

1.875 V TPS62228DDC EH

2.3 V TPS62223DDC ALX

1.2 V TPS62227DDC BRZ

(1) The DDC package is available in tape and reel. Add R suffix (TPS62220DDCR) to order quantities of 3000 parts. Add T suffix

(TPS62220DDCT) to order quantities of 250 parts.

over operating free-air temperature (unless otherwise noted)

(1)

TPS6222x UNIT

V

I

Supply voltage on pin

(2)

-0.3 to 7.0 V

Voltages on pins SW, EN, FB

(2)

-0.3 to V

I

+0.3 V

P

D

Continuous power dissipation See Dissipation Rating Table

T

J

Operating junction temperature range -40 to 150 °C

T

stg

Storage temperature -65 to 150 °C

Lead temperature (soldering, 10 sec) 260 °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.

T

A

≤ 25°C DERATING FACTOR T

A

= 70°C T

A

= 85°C

PACKAGE

POWER RATING ABOVE T

A

= 25°C POWER RATING POWER RATING

DDC 400 mW 4 mW/°C 220 mW 160 mW

(1) The thermal resistance junction to ambient of the 5-pin Thin-SOT23 is 250°C/W.

MIN NOM MAX UNIT

V

I

Supply voltage 2.5 6 V

V

O

Output voltage range for adjustable output voltage version 0.7 V

I

V

I

O

Output current 400 mA

L Inductor

(1)

4.7 µH

C

I

Input capacitor

(1)

4.7 µF

T

A

Operating ambient temperature -40 85 °C

T

J

Operating junction temperature -40 125 °C

(1) See the application section for further information

2

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ELECTRICAL CHARACTERISTICS

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

V

I

= 3.6 V, V

O

= 1.8 V, I

O

= 200 mA, EN = VIN, T

A

= -40 °C to 85 °C, typical values are at T

A

= 25 °C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

V

I

Input voltage range 2.5 6 V

I

Q

Operating quiescent current I

O

= 0 mA, Device is not switching 15 25 µA

Shutdown supply current EN = GND 0.1 1 µA

Undervoltage lockout threshold 1.5 2 V

ENABLE

EN high level input voltage 1.3 V

V

(EN)

EN low level input voltage 0.4 V

I

(EN)

EN input bias current EN = GND or VIN 0.01 0.1 µA

POWER SWITCH

V

I

= V

GS

= 3.6 V 530 670

P-channel MOSFET on-resistance m Ω

V

I

= V

GS

= 2.5 V 670 850

r

DS(on)

V

I

= V

GS

= 3.6 V 430 540

N-channel MOSFET on-resistance m Ω

V

I

= V

GS

= 2.5 V 530 660

P-channel leakage current V

DS

= 6 V 0.1 1 µA

I

lkg

N-channel leakage current V

DS

= 6 V 0.1 1 µA

I

(LIM)

P-channel current limit 2.5 V < V

I

< 6 V 600 670 880 mA

OSCILLATOR

f

S

Switching frequency 0.8 1.25 1.85 MHz

OUTPUT

I

O

Output current 400 mA

Adjustable output voltage

V

O

TPS62220 0.7 V

IN

V

range

V

ref

Reference voltage 0.5 V

V

I

= 3.6 V to 6 V, I

O

= 0 mA 0% 3%

TPS62220

Feedback voltage, See

(1)

Adjustable

V

I

= 3.6 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.5 V to 6 V, I

O

= 0 mA 0% 3%

TPS62221

1.5 V

V

I

= 2.5 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.5 V to 6 V, I

O

= 0 mA 0% 3%

TPS62224

1.6 V

V

I

= 2.5 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.5 V to 6 V, I

O

= 0 mA 0% 3%

TPS62229

1.7 V

V

I

= 2.5 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.5 V to 6 V, I

O

= 0 mA 0% 3%

TPS62222

V

O

Fixed output voltage

1.8 V

V

I

= 2.5 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.5 V to 6 V, I

O

= 0 mA 0% 3%

TPS62228

1.875 V

V

I

= 2.5 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.7 V to 6 V, I

O

= 0 mA 0% 3%

TPS62223

2.3 V

V

I

= 2.7 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

V

I

= 2.7 V to 6 V, I

O

= 0 mA 0% 3%

TPS62227

1.2 V

V

I

= 2.7 V to 6 V, 0 mA ≤ I

O

≤ 400 mA -3% 3%

Line regulation V

I

= 2.5 V to 6 V, I

O

= 10 mA 0.26 %/V

Load regulation I

O

= 100 mA to 400 mA 0.0014 %/mA

Leakage current into SW pin V

I

> V

O

, 0 V ≤ V

(SW)

≤ V

I

0.1 1 µA

I

lkg

Reverse leakage current into pin SW V

I

= open, EN = GND, V

(SW)

= 6 V 0.1 1 µA

(1) For output voltages ≤ 1.2 V, a 22-µF output capacitor value is required to achieve a maximum output voltage accuracy of 3% while

operating in power-save mode (PFM mode). For output voltages ≥ 2 V, an inductor of 10 µH and an output capacitor of ≥ 10 µF is

recommended. See the Application Information section for external components.

3

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PIN ASSIGNMENTS

3

2

4

5

1

V

I

GND

EN

SW

FB

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

DDC PACKAGE

(TOP VIEW)

Terminal Functions

TERMINAL

I/O DESCRIPTION

NAME NO.

EN 3 I This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown mode.

Pulling this pin to Vin enables the device. This pin must be terminated.

FB 4 I This is the feedback pin of the device. Connect this pin directly to the output if the fixed output voltage

version is used. For the adjustable version, an external resistor divider is connected to this pin. The

internal voltage divider is disabled for the adjustable version.

GND 2 Ground

SW 5 I/O Connect the inductor to this pin. This pin is the switch pin and is connected to the internal MOSFET

switches.

V

I

1 I Supply voltage pin

4

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_

+

_

+

_

+

_

+

_

+

REF

REF

Load Comparator

Skip Comparator

Current Limit Comparator

P-Channel

Power MOSFET

Driver

Shoot-Through

Logic

Control

Logic

Soft Start

1.25 MHz

Oscillator

Comparator

S

R

N-Channel

Power MOSFET

Comparator High

Comparator Low

Comparator Low 2

V

(COMP)

Sawtooth

Generator

V

I

Undervoltage

Lockout

Bias Supply

_

+

Comparator High

Comparator Low

Comparator Low 2

Compensation

V

REF

= 0.5 V

R2

See Note

R1

V

I

EN

SW

FB GND

Gm

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

FUNCTIONAL BLOCK DIAGRAM

NOTE: For the adjustable version (TPS62220) the internal feedback divider is disabled, and the FB pin is directly connected

to the internal GM amplifier

5

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TYPICAL CHARACTERISTICS

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

V

O

= 3.3 V ,

L = 4.7 µH,

C

O

= 10 µF

V

I

= 3.7 V

V

I

= 5 V

Efficency - %

I

L

- Load Current - mA

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

V

O

= 1.8 V ,

L = 4.7 µH,

C

O

= 22 µF

V

I

= 2.7 V

V

I

= 5 V

Efficency - %

I

L

- Load Current - mA

V

I

= 3.7 V

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

Table of Graphs

FIGURE

Figure 1 ,

vs Load current Figure 2 ,

η Efficiency

Figure 3

vs Input voltage Figure 4

I

Q

No load quiescent current vs Input voltage Figure 5

f

s

Switching frequency vs Temperature Figure 6

V

o

Output voltage vs Output current Figure 7

r

ds(on)

- P-channel switch, vs Input voltage Figure 8

r

ds(on)

r

ds(on)

- N-Channel rectifier switch vs Input voltage Figure 9

Load transient response Figure 10

PWM mode operation Figure 11

Power-save mode operation Figure 12

Start-up Figure 13

EFFICIENCY EFFICIENCY

vs vs

LOAD CURRENT LOAD CURRENT

Figure 1. Figure 2.

6

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70

75

80

85

90

95

100

2.5 3 3.5 4 4.5 5 5.5 6

V

O

= 1.8 V ,

L = 4.7 µH,

C

O

= 22 µF

I

L

= 150 mA

I

L

= 300 mA

Efficiency − %

V

I

− Input Voltage − V

I

L

= 1 mA

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

V

O

= 1.5 V ,

L = 4.7 µH,

C

O

= 10 µF

V

I

= 2.7 V

V

I

= 5 V

Efficency - %

I

L

- Load Current - mA

V

I

= 3.7 V

0

5

10

15

20

25

2.5 3 3.5 4 4.5 5 5.5 6

T

A

= 85°C

T

A

= 25°C

T

A

= −40°C

N0 Load Quiescent Current −

V

I

− Input Voltage − V

Aµ

1130

1140

1150

1160

1170

1180

1190

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

T

A

− Temperature − °C

V

I

= 3.6 V

V

I

= 6 V

V

I

= 2.5 V

f − Switching Frequency − kHz

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

EFFICIENCY EFFICIENCY

vs vs

LOAD CURRENT INPUT VOLTAGE

Figure 3. Figure 4.

NO LOAD QUIESCENT CURRENT SWITCHING FREQUENCY

vs vs

INPUT VOLTAGE TEMPERATURE

Figure 5. Figure 6.

7

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0.2

0.3

0.4

0.5

0.6

0.7

0.8

2.5 3 3.5 4 4.5 5 5.5 6

T

A

= 85°C

T

A

= 25°C

T

A

= -40°C

V

I

- Input Voltage - V

r

ds(on)

Ω- P-Channel Switch -

1.45

1.47

1.49

1.51

1.53

1.55

0 50 100 150 200 250 300

− Outrput Voltage − VV

O

I

O

− Output Current − mA

PFM Mode

PWM Mode

V

O

100 mV/div

I

L

200 mA/div

V

I

= 3.6 V , V

O

= 1.5 V , L = 4.7 µH,

C

O

=10 µF, Load Step 50 mA to 390 mA

transient

200 µs/div

0.2

0.3

0.4

0.5

0.6

0.7

0.8

2.5 3 3.5 4 4.5 5 5.5 6

T

A

= 85°C

T

A

= 25°C

T

A

= −40°C

V

I

− Input Voltage − V

rDS

(on)

ΩN-Channel Switch —

TPS62220, TPS62221, TPS62222

TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

OUTPUT VOLTAGE r

ds(on)

P-CHANNEL SWITCH

vs vs

OUTPUT CURRENT INPUT VOLTAGE

Figure 7. Figure 8.

r

ds(on)

N-CHANNEL SWITCH LOAD TRANSIENT RESPONSE

vs

INPUT VOLTAGE

Figure 9. Figure 10.

8

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