Datasheet SC1460CSK-3.3TR, SC1460CSK-5.0TR Datasheet (Semtech Corporation)

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

1

BLOCK DIAGRAM

PIN CONFIGURATION

3 Lead SOT-23

DESCRIPTION

The SC1460 is a versatile charge pump designed for
use in battery operated power supply applications re­quiring up to 5mA. It enables a simple low current
boost circuit to be implemented without the costly in­ductors or capacitors associated with regular switching
circuits. Features include internal MOSFETs, control
circuitry and charge pump capacitor, requiring only two
external capacitors for a total solution. With a very
high operating frequency (8MHz free running at 2.5V in
typically), the SC1460 does not require large input or
output capacitors, and therefore uses very little board
space. Two versions of the SC1460 are available: the

-3.3 produces a regulated 3.3V output from 2.5V in,
and the -5.0 produces a regulated 5V output from 3.3V
in. It is supplied in the popular 3 lead, SOT-23 pack­age.

FEATURES

•

Small size - SOT-23 package

•

4% voltage accuracy

•

Typical 100uA quiescent current

TEL:[phone] FAX:[phone] WEB:http://www.semtech.com

ORDERING INFORMATION

DEVICE

(1)(2)

PACKAGE

SC1460CSK-X.X SOT-23

Notes:
(1) Where X.X denotes voltage options. Available volt­ages are: 3.3V and 5.0V.
(2) Add suffix ‘TR’ for tape and reel.

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Maximum Units

Supply Voltage VIN -0.3 to + 4 V
Output Voltage VO -0.3 to +6.0 V

Thermal Resistance
Junction to Ambient

θ

JA

410 °C/W

Operating Temperature T

A

0 to +70 °C

Temperature Range T

J

0 to 125 °C

Storage Temperature T

STG

-65 to +150 °C

Lead Temperature
(Soldering) 10 seconds

T

L

300 °C

APPLICATIONS

•

Handheld Power Supplies

•

PDA Power Supplies

•

Notebook Power Supplies

•

Peripheral Card Supplies

•

Industrial Power Supplies

•

High Density DC/DC Conversion

(Top View)

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

2

ELECTRICAL CHARACTERISTICS

Unless specified: VIN = 3.3V (-5.0 parts), VIN = 2. 5V (-3.3 parts), 0 ≤ IO ≤ 4mA, CIN = 0.22uF, C

OUT

= 47nF, TA = 25°C. Values in

bold

apply

over full operating temperature range

Parameter Symbol Conditions MIN TYP MAX Units

Input Supply Voltage VIN 2.25 3.63 V
Input Supply Current I

IN

IO = 0mA VIN = 2.5 V 100 150 µA

Output Voltage VO SC1460CSK - 3.3, VIN = 2.5V

-4

1.32 x VIN

4

%

SC1460CSK - 5.0, VIN = 3.3V

4

1.515 X VIN

4

%

Output Ripple (pk-pk) V

R

IO = 4mA, C

OUT

= 47nF 50 mV

Output Current I

O

45 mA

Efficiency

η

I

O

= 4mA 50 56 %

Oscillator Frequency OSC SC1460CSK - 3.3, VIN = 2.5V 8 MHz

SC1460CSK - 5.0, VIN = 3.3V 8.75

Time to Regulation at
Turn-On

t

ON

Power Up with IO = 4mA 100 µs

APPLICATION CIRCUIT

VIN

VO

U1 SC1460

1

2

3

GND

VO

VIN

Cin

0.22uF

Cout

47nF

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

3

Ty p ic a l Iin v s . V in @25 D e g. C .

0

2

4

6

8

10

12

14

16

22.533.54
Vin (V)

Iin (mA)

Io = 6 mA
Io = 5 mA
Io = 4 mA
Io = 0 mA

Ty p ic a l Iin v s . Io @2 5 Deg . C.

0

2

4

6

8

10

12

14

16

0123456

Io (mA)

Iin (mA)

Vin = 3.60V
Vin = 3.30V
Vin = 2.50V
Vin = 2.25V

Ty p ic a l V o vs . Io @2 5 Deg . C.

2

2.5

3

3.5

4

4.5

5

0123456

Io (mA )

Vo (V)

Vin = 3.60V
Vin = 3.30V
Vin = 2.50V
Vin = 2.25V

Ty p ic a l E ff. v s . Io @2 5 Deg . C.

45

50

55

60

44.555.56

Io (mA)

Efficiency (%)

Vin = 2.25V
Vin = 2.50V
Vin = 3.30V
Vin = 3.60V

Typical Eff. vs. Vin @25 Deg. C.

45

50

55

60

22.533.54
Vin (V)

Efficiency (%)

Io = 4mA
Io = 5mA
Io = 6mA

Typical Eff. vs. Vo @25 Deg. C.

45

50

55

60

2.5 3 3.5 4 4.5 5
Vo (V)

Efficiency (%)

Io = 4 mA
Io = 5 mA
Io = 6 mA

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

4

Typical Vo vs. Vin @25 Deg. C.

2

2.5

3

3.5

4

4.5

5

22.533.54
Vin (V)

Vo (V)

Io = 0 mA
Io = 4 mA
Io = 5 mA
Io = 6 mA

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

5

Vo ripple

Typical Vo ripple vs. Cout @ Vin = 2.50V

000.0E+0

10.0E-3

20.0E-3

30.0E-3

40.0E-3

50.0E-3

60.0E-3

70.0E-3

22.0E-9 47.0E-9 56.0E-9 68.0E-9 82 .0E-9 180.0E-9 220.0E-9

Cout (F)

Vo ripple (V)

Iout = 4mA

Ty p ic a l Iin v s . T a @ Io = 0 mA

0.05

0.07

0.09

0.11

0.13

0.15

0.17

0.19

0 10203040506070

Ta (Deg . C.)

Iin (mA)

Vin = 2.25 V
Vin = 2.50 V
Vin = 3.30 V
Vin = 3.60 V

Typical Vo vs. Ta @ Vin = 2.50V

2.5

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

3.5

0 10203040506070

Ta (Deg. C.)

Vo (V)

Io = 0mA
Io = 4mA
Io = 5mA
Io = 6mA

Typical Eff. vs. Ta @ Io = 4 mA

53

54

55

56

57

0 1020304050607080

Ta (Deg. C.)

Efficiency (%)

Vin = 2.25 V
Vin = 2.50 V
Vin = 3.30 V
Vin = 3.60 V

SC1460

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

5mA CAPLESS

TM

CHARGE PUMP

PRELIMINARY - July 6, 1999

6

OUTLINE DRAWING SOT-23-3L