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

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V

I

GND

ENSWFB

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

VO= 1.8 V,

L = 4.7 H,m

CO= 22 Fm

Efficency − %

IL− Load Current − mA

VI= 3.7 V

Typical Application (Adjustible Output Voltage Version)

VI= 5 V

VI= 2.7 V

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

FEATURES DESCRIPTION

• High-Efficiency Synchronous Step-Down

Converter With up to 95% Efficiency

• 2.5-V to 6-V Input Voltage Range

• Adjustable Output Voltage Range From 0.7 V

to V

I

• Fixed Output Voltage Options Available

• Up to 400-mA Output Current

• 1.25-MHz Fixed Frequency PWM Operation

• Highest Efficiency Over Wide Load Current

Range Due to Power-Save Mode

• 15-µA Typical Quiescent Current

• Soft Start

• 100% Duty Cycle Low-Dropout Operation

• Dynamic Output-Voltage Positioning

• Available in TSOT23 Package

APPLICATIONS

• PDAs and Pocket PC

• Cellular Phones, Smart Phones

• OMAP™ and Low Power DSP Supply

• Digital Cameras

• Portable Media Players

• Portable Equipment

• WLAN PC Cards

The TPS6222x devices are a family of high-efficiency,
synchronous step-down converters ideally suited for
portable systems powered by 1-cell Li-Ion or 3-cell
NiMH/NiCd batteries. The devices are also suitable to
operate from a standard 3.3-V or 5-V voltage rail.

With an output voltage range of 6 V down to 0.7 V
and up to 400-mA output current, the devices are
ideal for powering the low voltage TMS320™ DSP
family and processors used in PDAs, pocket PCs,
and smart phones. Under nominal load current, the
devices operate with a fixed switching frequency of
typically 1.25 MHz. At light load currents, the part
enters the power-save mode operation; the switching
frequency is reduced and the quiescent current is
typically only 15 µA; therefore, the device achieves
the highest efficiency over the entire load current
range. The TPS6222x needs only three small
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
regulation with small ceramic input and output
capacitors.

TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

OMAP, TMS320 are trademarks of Texas Instruments.

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 © 2003–2006, Texas Instruments Incorporated

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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

T

A

OUTPUT VOLTAGE THIN-SOT23 PACKAGE SYMBOL

(1)

Adjustable TPS62220DDC ALN

1.5 V TPS62221DDC ALO

1.6 V TPS62224DDC ALQ

-40°C to 85°C

1.7 V TPS62229DDC EJ

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.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature (unless otherwise noted)

V

I

Supply voltage on pin
Voltages on pins SW, EN, FB

P

D

T

J

T

stg

Continuous power dissipation See Dissipation Rating Table
Operating junction temperature range -40 to 150 °C
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.

(2)

(2)

(1)

TPS6222x UNIT

-0.3 to 7.0 V

-0.3 to VI+0.3 V

DISSIPATION RATING TABLE

PACKAGE

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

POWER RATING ABOVE TA= 25°C POWER RATING POWER RATING

(1)

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.

RECOMMENDED OPERATING CONDITIONS

V
V
I
L Inductor
C
T
T

(1) See the application section for further information

2

Supply voltage 2.5 6 V

I

Output voltage range for adjustable output voltage version 0.7 V

O

Output current 400 mA

O

Input capacitor

I

Operating ambient temperature -40 85 °C

A

Operating junction temperature -40 125 °C

J

(1)

(1)

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MIN NOM MAX UNIT

I

4.7 µH

4.7 µF

V

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TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

ELECTRICAL CHARACTERISTICS

VI= 3.6 V, VO= 1.8 V, IO= 200 mA, 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

I

I

Q

ENABLE

V

(EN)

I

(EN)

POWER SWITCH

r

DS(on)

I

lkg

I

(LIM)

OSCILLATOR

f

S

OUTPUT

I

O

V

O

V

ref

V

O

I

lkg

Input voltage range 2.5 6 V
Operating quiescent current IO= 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

EN high level input voltage 1.3 V
EN low level input voltage 0.4 V
EN input bias current EN = GND or VIN 0.01 0.1 µA

P-channel MOSFET on-resistance m Ω

N-channel MOSFET on-resistance m Ω

VI= V
VI= V
VI= V

VI= V
P-channel leakage current V
N-channel leakage current V

= 3.6 V 530 670

GS

= 2.5 V 670 850

GS

= 3.6 V 430 540

GS

= 2.5 V 530 660

GS

= 6 V 0.1 1 µA

DS

= 6 V 0.1 1 µA

DS

P-channel current limit 2.5 V < VI< 6 V 600 670 880 mA

Switching frequency 0.8 1.25 1.85 MHz

Output current 400 mA
Adjustable output voltage

range

TPS62220 0.7 V

Reference voltage 0.5 V

Feedback voltage, See

Fixed output voltage

TPS62220

(1)

Adjustable
TPS62221

1.5 V
TPS62224

1.6 V
TPS62229

1.7 V
TPS62222

1.8 V
TPS62228

1.875 V
TPS62223

2.3 V
TPS62227

1.2 V

VI= 3.6 V to 6 V, IO= 0 mA 0% 3%

VI= 3.6 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.5 V to 6 V, IO= 0 mA 0% 3%

VI= 2.5 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.5 V to 6 V, IO= 0 mA 0% 3%

VI= 2.5 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.5 V to 6 V, IO= 0 mA 0% 3%

VI= 2.5 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.5 V to 6 V, IO= 0 mA 0% 3%

VI= 2.5 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.5 V to 6 V, IO= 0 mA 0% 3%

VI= 2.5 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.7 V to 6 V, IO= 0 mA 0% 3%

VI= 2.7 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%

VI= 2.7 V to 6 V, IO= 0 mA 0% 3%

VI= 2.7 V to 6 V, 0 mA ≤ IO≤ 400 mA -3% 3%
Line regulation VI= 2.5 V to 6 V, IO= 10 mA 0.26 %/V
Load regulation IO= 100 mA to 400 mA 0.0014 %/mA
Leakage current into SW pin VI> VO, 0 V ≤ V
Reverse leakage current into pin SW VI= open, EN = GND, V

≤ V

(SW)

I

= 6 V 0.1 1 µA

(SW)

0.1 1 µA

V

IN

(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.

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3

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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

PIN ASSIGNMENTS

DDC PACKAGE

(TOP VIEW)

Terminal Functions

TERMINAL

NAME NO.

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

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

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

V

I

1 I Supply voltage pin

I/O DESCRIPTION

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

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.

switches.

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

FUNCTIONAL BLOCK DIAGRAM

TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227

TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

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

to the internal GM amplifier

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40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

VO = 3.3 V ,
L = 4.7 µH,
CO = 10 µF

VI = 3.7 V

VI = 5 V

Efficency - %

IL - Load Current - mA

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

VO = 1.8 V ,
L = 4.7 µH,
CO = 22 µF

VI = 2.7 V

VI = 5 V

Efficency - %

IL - Load Current - mA

VI = 3.7 V

TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227
TPS62228, TPS62229

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

η Efficiency

I

Q

f

s

V

o

r

ds(on)

No load quiescent current vs Input voltage Figure 5
Switching frequency vs Temperature Figure 6
Output voltage vs Output current Figure 7
r

- P-channel switch, vs Input voltage Figure 8

ds(on)

r

- N-Channel rectifier switch vs Input voltage Figure 9

ds(on)

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

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

Figure 1 ,

vs Load current Figure 2 ,

Figure 3

vs Input voltage Figure 4

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

VO = 1.8 V ,
L = 4.7 µH,
CO = 22 µF

IL = 150 mA

IL = 300 mA

Efficiency − %

VI − Input Voltage − V

IL = 1 mA

40

45

50

55

60

65

70

75

80

85

90

95

100

0.01 0.1 1 10 100 1000

VO = 1.5 V ,
L = 4.7 µH,
CO = 10 µF

VI = 2.7 V

VI = 5 V

Efficency - %

IL - Load Current - mA

VI = 3.7 V

0

5

10

15

20

25

2.5 3 3.5 4 4.5 5 5.5 6

TA = 85°C

TA = 25°C

TA = −40°C

N0 Load Quiescent Current −

VI − Input Voltage − V

Aµ

1130

1140

1150

1160

1170

1180

1190

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

VI = 3.6 V

VI = 6 V

VI = 2.5 V

f − Switching Frequency − kHz

TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227

SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006

EFFICIENCY EFFICIENCY

vs vs

LOAD CURRENT INPUT VOLTAGE

TPS62228, TPS62229

Figure 3. Figure 4.

NO LOAD QUIESCENT CURRENT SWITCHING FREQUENCY

INPUT VOLTAGE TEMPERATURE

Figure 5. Figure 6.

vs vs

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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

TA = 85°C

TA = 25°C

TA = -40°C

VI - 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

IO − Output Current − mA

PFM Mode

PWM Mode

V

O

100 mV/div

I

L

200 mA/div

VI = 3.6 V , VO = 1.5 V , L = 4.7 µH,
CO =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

TA = 85°C

TA = 25°C

TA = −40°C

VI − 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
OUTPUT CURRENT INPUT VOLTAGE

r

ds(on)

vs vs

Figure 7. Figure 8.

N-CHANNEL SWITCH LOAD TRANSIENT RESPONSE

vs

INPUT VOLTAGE

P-CHANNEL SWITCH

ds(on)

8

Figure 9. Figure 10.

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