TEXAS INSTRUMENTS REG711 Technical data

REG711

REG711

www.ti.com

50mA SWITCHED-CAP DC/DC CONVERTER

FEATURES

● WIDE INPUT RANGE: 1.8V TO 5.5V

5V VERSION: 2.7V TO 5.5V

● AUTOMATIC STEP-UP/STEP-DOWN

OPERATION

● LOW INPUT CURRENT RIPPLE

● LOW OUTPUT VOLTAGE RIPPLE

● MINIMUM NUMBER OF EXTERNAL

COMPONENTS—NO INDUCTORS

● 1MHz INTERNAL OSCILLATOR ALLOWS

SMALL CAPACITORS

● “SHUTDOWN” MODE

● THERMAL AND CURRENT LIMIT

PROTECTION

● FIVE OUTPUT VOLTAGES AVAILABLE:

5.0V, 3.3V, 3.0V, 2.7V, 2.5V

● THIN, SMALL PACKAGE: MSOP-8

APPLICATIONS

● SMART CARD READERS

● CELLULAR PHONES

● SIM CARD SUPPLIES

● PORTABLE COMMUNICATION DEVICES

● PERSONAL DIGITAL ASSISTANTS

● MODEMS

● NOTEBOOK AND PALM-TOP COMPUTERS

● ELECTRONIC GAMES

● HANDHELD METERS

● PCMCIA CARDS

● CARD BUSES

● LCD DISPLAYS

DESCRIPTION

The REG711 is a switched capacitor voltage con­verter, which produces a regulated, low ripple output
voltage from an unregulated input voltage. A wide
input supply voltage of 1.8V to 5.5V makes the
REG711 ideal for a variety of battery sources, such as
single cell Li-Ion, or two and three cell Nickel or
Alkaline based chemistries.

The input voltage may vary above and below the
output voltage and the output will remain in regula­tion. It works equally well for step up or down without
the need for an inductor, providing low EMI DC/DC
conversion. The high switching frequency allows the
use of small surface-mount capacitors, saving board
space and reducing cost. The REG711 is thermally
protected and current limited, protecting the load and
the regulator during fault conditions. Typical ground
pin current (quiescent current) is 1mA at full load,
60µA with no load, and less than 1µA in shutdown
mode. This regulator comes in a thin MSOP-8 pack­age with a component height of less than 1.1mm.

C

PUMP

ENABLE

+

C

+

IN

PGND

REG711

GND

R

C

OUT

LED

Copyright © 2000, Texas Instruments Incorporated SBVS027A Printed in U.S.A. February, 2001

SPECIFICATIONS

Boldface limits apply over the specified temperature range, TA = –40°C to +85°C

At TA = +25°C, VIN = V

/2 + 0.75V, I

OUT

= 5mA, CIN = C

OUT

= 2.2µF, C

OUT

= 0.22µF, V

PUMP

= 1.3V, unless otherwise noted

ENABLE

REG711EA
PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT VOLTAGE

Guaranteed Startup

REG711-5.0 See conditions under “output voltage” with a 2.7 5.5 V
All Other Models resistive load not lower than typical V

. 1.8 5.5 V

OUT/IOUT

OUTPUT VOLTAGE
REG711-5.0 I

REG711-3.3 I

REG711-3.0 I

REG711-2.7 I

REG711-2.5 I

≤ 15mA, 2.7V < VIN < 5.5V 4.75 5.0 5.25 V

OUT

≤ 50mA, 3.0V < VIN < 5.5V

I

OUT

≤ 15mA, 1.8V < VIN < 5.5V 3.14 3.3 3.46 V

OUT

I

≤ 50mA, 2.2V < VIN < 5.5V

OUT

≤ 15mA, 1.8V < VIN < 5.5V 2.85 3.0 3.15 V

OUT

≤ 50mA, 2.2V < VIN < 5.5V

I

OUT

≤ 15mA, 1.8V < VIN < 5.5V 2.57 2.7 2.83 V

OUT

≤ 50mA, 2.0V < VIN < 5.5V

I

OUT

≤ 15mA, 1.8V < VIN < 5.5V 2.38 2.5 2.62 V

OUT

I

≤ 50mA, 2.0V < VIN < 5.5V

OUT

OUTPUT CURRENT

Nominal 50 mA
Short Circuit

OSCILLATOR FREQUENCY NOTE
EFFICIENCY
RIPPLE VOLTAGE
ENABLE CONTROL V

Logic High Input Voltage 1.3 V

(2)

(3)

(4)

(1)

I

= 15mA, VIN = 2.7V, REG711-5.0 90 %

OUT

I

= 50mA 40 mVp-p

OUT

= 1.8 to 5.5V

IN

80 mA

1.0 MHz

Logic Low Input Voltage –0.2 0.4 V
Logic High Input Current 100 nA
Logic Low Input Current 100 nA

THERMAL SHUTDOWN

Shutdown temperature 160 °C
Shutdown recovery 140 °C

SUPPLY CURRENT

(quiescent current) I
In Shutdown Mode V

= 1.8 to 5.5V, Enable = 0V 0.01 2 µA

IN

= 0mA 60 100 µA

OUT

TEMPERATURE RANGE

Specification T
Operating T
Storage T
Thermal Resistance,

θ

JA

A
A
A

MSOP-8 150 °C/W

–40 +85 °C
–55 +125 °C
–65 +150 °C

NOTES: (1) Effective series resistance (ESR) of capacitors is < 0.1Ω. (2) The supply circuit is twice the output short-circuit current. (3) The converter regulates by
enabling and disabling periods of switching cycles. The switching frequency is the oscillator frequency during an active period. (4) See efficiency curves for other

configurations.

V

IN/VOUT

(1)

.

IN

V

2

REG711

SBVS027A

PIN CONFIGURATION

SIMPLIFIED BLOCK DIAGRAM

Top View MSOP

1

NC

V

GND

2
3

IN

4

Enable

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ................................................................... –0.3V to +5.5V

Enable Input ...........................................................................–0.3V to V

Output Short-Circuit Duration ...................................................... Indefinite

Operating Temperature Range ....................................... –55°C to +125°C

Storage Temperature Range.......................................... –65°C to +150°C

Junction Temperature.....................................................–55°C to +150°C

Lead Temperature (soldering, 3s) ................................................. +240°C

NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.

8

V

OUT

7

C

PUMP+

6

C

PUMP–

5

PGND

(1)

IN

C

PUMP

0.22µF

76

Control

Thermal

REG711

8

&

GND

C

OUT

2.2µF

V

OUT

V

IN

Enable

3

C

IN

2.2µF

2

54

PGND

Simplified Block Diagram

ELECTROSTATIC
DISCHARGE SENSITIVITY

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

PRODUCT VOLTAGE PACKAGE NUMBER RANGE MARKING

OUTPUT DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

5V Output

REG711EA-5 5.0V MSOP-8 337 –40°C to +85°C C11B REG711EA-5 Rails

"""" " "REG711EA-5/250 Tape and Reel
"""" " "REG711EA-5/2K5 Tape and Reel

3.3V Output

REG711EA-3.3 3.3V MSOP-8 337 –40°C to +85°C C11C REG711EA-3.3 Rails

"""" " "REG711EA-3.3/250 Tape and Reel
"""" " "REG711EA-3.3/2K5 Tape and Reel

3V Output

REG711EA-3.0 3.0V MSOP-8 337 –40°C to +85°C C11D REG711EA-3 Rails

"""" " "REG711EA-3/250 Tape and Reel
"""" " "REG711EA-3/2K5 Tape and Reel

2.7V Output

REG711EA-2.7 2.7V MSOP-8 337 –40°C to +85°C C11F REG711EA-2.7 Rails

"""" " "REG711EA-2.7/250 Tape and Reel
"""" " "REG711EA-2.7/2K5 Tape and Reel

2.5V Output

REG711EA-2.5 2.5V MSOP-8 337 –40°C to +85°C C11G REG711EA-2.5 Rails

"""" " "REG711EA-2.5/250 Tape and Reel

NOTE: (1) Voltage will be marked on reel. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of “REG711EA-5/2K5” will get a single 2500-piece Tape and Reel.

PACKAGE SPECIFIED

(1)

NUMBER

(2)

MEDIA

REG711

SBVS027A

3

TYPICAL PERFORMANCE CURVES

EFFICIENCY vs LOAD CURRENT

REG711 - 5.0V

Load Current (mA)

Efficiency (%)

90

80

70

60

50

40

30

10.1 10 100

VIN = 2.7V

VIN = 3.0V

VIN = V

OUT

EFFICIENCY vs LOAD CURRENT

REG711 - 3.0V

Load Current (mA)

Efficiency (%)

90

80

70

60

50

40

30

10.1 10 100

VIN = 1.8V

VIN = 2.2V

VIN = V

OUT

EFFICIENCY vs LOAD CURRENT

REG711 - 2.5V

Load Current (mA)

Efficiency (%)

90

80

70

60

50

40

30

10.1 10 100

VIN = 1.8V

VIN = 2.0V

VIN = V

OUT

At TA = +25°C, VIN = V

/2 + 0.75V, I

OUT

= 5mA, CIN = C

OUT

= 2.2µF, C

OUT

= 0.22µF, unless otherwise noted.

PUMP

100

80

60

Efficiency (%)

REG711-2.5

40

20

90

VIN = 1.8V

80

70

60

EFFICIENCY vs V

IN

REG711-5.0

REG711-3.3

REG711-2.7

REG711-3.0

31.5 2 2.5 3.5 4 4.5 5 5.5
VIN (V)

EFFICIENCY vs LOAD CURRENT

REG711 - 3.3V

VIN = 2.2V

I

OUT

= 15mA

4

Efficiency (%)

50

40

30

10.1 10 100

EFFICIENCY vs LOAD CURRENT

90

80

VIN = 1.8V

70

60

Efficiency (%)

50

40

30

10.1 10 100

Load Current (mA)

REG711 - 2.7V

Load Current (mA)

VIN = V

OUT

VIN = 2.0V

VIN = V

OUT

REG711

SBVS027A