Datasheet SC1464CMS.TR Datasheet (Semtech Corporation)

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

PRELIMINARY - August 11, 2000

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DESCRIPTION

The SC1464 is a versatile char ge pump designed for
use in battery operated power supply applications. A
simple, low current charge pum p doubler c an be im ple­mented without costly inductors or capacitors . Internal
MOSFET’s and control circ uitry eliminate the need for
costly board space and design time. T he small device
footprint allows for compact circuit design.

The SC1464 charge pump can be used for applications
that require up to 60mA of output current with V

2.85V and V
package helps minimize board space.

The TF1 and TF2 pins provide binary control of the
oscillator frequency to either 1 MHz, 260kHz, 32k Hz or
8kHz. The user can change the fr equency during oper­ation with extremely fast settling time.

= 5.2V. The small 8 lead MSOP-8

OUT

=

IN

FEATURES

= Small size - MSOP-8 package
= Typical efficiency of 90% @ full load
= Designed to work with ceramic or tantalum

capacitors

= Soft start functionality
= Short-Circuit and Over-Temperature protection
= <55µA input current @ no load (TF1=0;TF2=1)
= <330µA input current @ no load (TF1=0;TF2=0)
= Oscillator frequency accurate to ±5%
= Shutdown current < 1µA
= All Specifications rated over the full temperature

range (-40°C to 85 °C)

APPLICATIONS

= Cellular phones
= Handheld devices
= PDA power supplies
= Peripheral card supplies

ORDERING INFORMATION

Part Number

(1)

Package

APPLICATION CIRCUIT

Vin =3 V +/- 5%

Logic Input or Vin

Cin

Iout Freq

60mA 260kHz
20mA 260kHz
60mA 1MHz
20mA 1MHz

TF1
TF2

SC1464CMS.TR MSOP-8

Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.

U1
SC1464

37

VoVin

4

EN

1

TF1

2

TF2

Cin Cout CBucket

3.3uF 3.3uF 2.2uF

1.0uF 1.0uF 0.22uF

1.0uF 1.0uF 0.22uF

0.22uF 0.22uF 0.10uF

GND

8

C+

C-

5

CBucket

6

Vo =5.2 V to 6.2 V

Cout

1

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

60mA PROGRAMMABLE FIXED

SC1464

FREQUENCY CHARGE PUMP DOUBLER

PRELIMINARY - August 11, 2000

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Maximum Units

Input Supply Voltage V
Output Voltage V

Short-Circuit Duration SC Indefinite

V

OUT

Operating Ambient Temperature Range T
Operating Junction Temperature T
Storage Temperature Range T
Lead Temperature (Soldering) 10 Sec T
Thermal Temperature Junction to Ambient
Thermal Impedance Junction to Case

IN

STG

LEAD

°

JA

°

JC

O

A

J

-0.3 to +4 V

-0.3 to +8 V

-40 to +85 °C

-40 to +125 °C

-65 to +150 °C
300 °C
185 °C/W

47 °C/W

ELECTRICAL CHARACTERISTICS

Unless specified, TA = -40°C to 85°C, EN = VIN, C

Parameter Symbol Test Conditions MIN TYP MAX Units

Input Supply Voltage V
Input Supply Current I

IN

IO = 0 TF1 = 0, TF2 = 1, freq = 8kHz 45 55 µA

IN

I
I
I

= 2.2µF(ESR = 0.1τ), C

Bucket

, C

= 3.3µF(ESR = 1τ), V

IN

OUT

= 3V±5%, V

IN

= 5.2V to 6.2V.

OUT

2.5 3.5 V

= 0 TF1 = 0, TF2 = 0, freq = 32kHz 270 330

O

= 0 TF1 = 1, TF2 = 0, freq = 260kHz 1.6 2 mA

O

= 0 TF1 = 1, TF2 = 1, freq = 1MHz 5.8 8

O

EN = GND 1 µA

Output Current I

Max. Output Voltage

(3)

V
Short Circuit Current I
Output Ripple (pk-pk)

(1)(3)

Power Efficiency

V

VI = 2.85, TF1 = 0, TF2 = 1. freq = 8kHz 5

O

= 2.85, TF1 = 0, TF2 = 0. freq = 32kHz 20 mA

V

I

V

= 2.85, TF1 = 1, TF2 = 0. freq = 260kHz 60

I

= 2.85, TF1 = TF2 = 1. freq = 1MHz

V

I

= 220nF

C

bucket

OUT

SC

R

♣

VO = 0 to V

IO = 60mA, Frequency = 260kHz 150 mV

I

= 60mA, TF1 = 1, TF2 = 0 85 %

O

IO = 0 2*V

- 1V, IO = I

IN

IN

45

IN

V

170 mA

Oscillator Frequency OSC TF1 = 0, TF2 = 1 7.82 8.50 9.18 kHz

TF1 = 0, TF2 = 0 30.18 32.80 35.42 kHz
TF1 = 1, TF2 = 0 241.13 262.10 283.07 kHz

TF1 = TF2 = 1 0.92 1.00 1.08 MHz

2

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

60mA PROGRAMMABLE FIXED

SC1464

FREQUENCY CHARGE PUMP DOUBLER

PRELIMINARY - August 11, 2000

ELECTRICAL CHARACTERISTICS

Unless specified, TA = -40°C to 85°C, EN = VIN, C

Parameter Symbol Test Conditions MIN TYP MA X Units

= 2.2µF(ESR = 0.1τ), C

Bucket

, C

= 3.3µF(ESR = 1τ), V

IN

OUT

= 3V±5%, V

IN

= 5.2V to 6.2V.

OUT

Time to Regulation at
Turn-on

(2)(3)

Input High Threshold V
Input Low Threshold V
Inrush Current

(3)

t

ON

I

INRUSH

IO = 0 to 60 mA

freq = 260kHz

ih

il

All input pins 1.3 V
All input pins 0.4 V

Upon application of VIN, Maximum

average current over 10 periods

Over Temperature
protection

Over Temperature
Hysteresis

(3)

(3)

O.T. 170 °C

O.T.H 10 °C

NOTES:

(1) All electrical characteristics are for the application circuit on page 2.
(2) Soft start functionality is performed along with short circuit protection. If V
switches are turned off and V
then a current limit version of the switches are turned on until V

is charged with a 70mA current source from VIN. When V

OUT

reaches V

OUT

all switches are enabled.
(3) Guaranteed by design.

420 1000 µs

750 mA

is less than VIN - 200mV, then all

OUT

+ a PMOS threshold, at which point

IN

reaches VIN - 200mV,

OUT

3

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

BLOCK DIAGRAM

Thermal

Shut Down

PIN CONFIGURATION

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

Top View

(MSOP-8)

PIN DESCRIPTION

Pin# Pin Name Pin Function

1 TF1 Binary frequency select pins. The frequency is set according to the following table.
2TF2

3 VO Voltage output
4 EN Enable. Pull EN low to reduce the current on VIN to less than 1µA.

TF1

0 1

TF2 0 32kHz 260kHz

18kHz1MHz

5 C+ This pin should be connected to the positive terminal of the external charging capacitor.
6 C- This pin should be connected to the negative terminal of the external charging capacitor.
7 VIN Supply voltage input.
8 GND Ground.

4

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

(

)

(

)

(

)

(

)

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

E ff v s V o (260k H z )

96.00%

94.00%

%
Eff

92.00%

90.00%

4.50 5.00 5.50 6.00 6.50 7.00

Vo (V)

Eff vs Vin (260kHz)

96.00%

94.00%

%
Eff

92.00%

90.00%

2.50 2.70 2.90 3.10 3.30 3.50

Vin (V)

20 ma
40 ma
60 ma

60ma

Vo vs Io (2 6 0 k H z )

7.500

7.000

6.500

6.000

5.500

5.000

Vo (V)

4.500

4.000

3.500

3.000

2.E-02 3.E-02 3.E-02 4.E-02 4.E-02 5.E-02 5.E-02 6.E-02 6.E-02

Io (A)

Vin = 2.5
Vin = 3.0
Vin = 3.5

Iin vs Vin (260kHz)

140.0E-3

120.0E-3

100.0E-3

80.0E-3

A
Iin

60.0E-3

40.0E-3

20.0E-3

000.0E+0

2.45 2.65 2.85 3.05 3.25 3.45 3.65

Vin (V)

20ma
40 ma
60ma

Iin vs Io ( 2 60 k Hz )

140.0E-3

120.0E-3

100.0E-3

80.0E-3

A
Iin

60.0E-3

40.0E-3

20.0E-3

000.0E+0

1.E-02 2.E-02 3.E-02 4.E-02 5.E-02 6.E-02 7.E-02

Io (A)

Vin = 2.5
Vin = 3
Vin = 3.5

95.50%

95.00%

94.50%

94.00%

Eff (%)

93.50%

93.00%

92.50%

92.00%

Vin = 2.5
Vin = 3.0
Vin =3.5

10.0E-3 20.0E-3 30.0E-3 40.0E-3 50.0E-3 60.0E-3 70.0E-3

Eff vs Io (260kHz)

Io (A)

5

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

Vo vs V in (260kHz)

7.000

6.500

6.000

5.500

Vo (V)

5.000

4.500

4.000

2.50 2.70 2.90 3.10 3.30 3.50

Vin (V)

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

20 ma
40 ma
60 ma

SC1464

6

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

Iin vs Ta (8k Hz) @ Io = 0 mA

60.0E-6

55.0E-6

50.0E-6

45.0E-6

Iin (A)

40.0E-6

35.0E-6

30.0E-6

25.0E-6

-40-200 20406080100

Ta (Deg. C.)

Iin vs Ta (32kHz) @ Io = 0m A

320.0E-6

300.0E-6

280.0E-6

260.0E-6

Iin (A)

240.0E-6

Vin = 3.5
Vin = 3
Vin = 2.5

Iin vs Ta (1MHz) @ Io = 0m A

7.5E-3

7.0E-3

6.5E-3

6.0E-3

Iin (A)

5.5E-3

5.0E-3

4.5E-3

4.0E-3

-40 -20 0 20 40 60 80 100

Ta (Deg. C.)

Vin = 3.5
Vin = 3
Vin = 2.5

220.0E-6

200.0E-6

180.0E-6

-40-200 20406080100

Ta ( Deg. C .)

Iin vs Ta (260kHz) @ I o = 0m A

2.3E-3

2.1E-3

1.9E-3

1.7E-3

Iin (A)

1.5E-3

1.3E-3

1.1E-3

900.0E-6

-40-200 20406080100

Ta (Deg. C.)

Vin = 3.5
Vin = 3
Vin = 2.5

Vin = 3.5
Vin = 3
Vin = 2.5

7

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

V

V

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

o vs Ta (8Khz) @ Vin = 3.00

6.2

6.15

6.1

6.05

6

Vo (V)

5.95

5.9

5.85

5.8

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (Deg. C.)

0 ma
1 ma
2 ma

Vo vs Ta (32Khz) @ Vin = 3.00 V

6.1

6

5.9

Vo vs Ta (1Mhz) @ Vin = 3.00 V

6.2

6.1

6

5.9

Vo (V)

5.8

5.7

5.6

5.5

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (Deg. C.)

0 ma
20 ma
40 ma
60 ma

5.8

Vo (V)

5.7

5.6

5.5

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (D e g . C .)

0 ma
1 ma
2 ma

Vo vs Ta (260Khz) @ Vin = 3.00 V

6.2

6.1

6

5.9

Vo (V)

5.8

5.7

5.6

5.5

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (Deg. C.)

0 ma
20 ma
40 ma
60 ma

8

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

(

)

a

(

)

V

Ef f v s Io (2 6 0 k H z ) @ Vin = 3 .0 0

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

95.80%

95.60%

95.40%

95.20%

95.00%

94.80%

Eff (%)

94.60%

94.40%

94.20%

94.00%

Ta = 25 Deg. C.
Ta = -40 Deg. C.
Ta = 85 Deg. C.

1.50E-02 2.50E-02 3.50E-02 4.50E-02 5.50E-02 6.50E-02

Io (A )

Eff vs Ta @ V in = 3 .00 V, Io = 1 m

98.00%

96.00%

94.00%

92.00%

%

90.00%

Eff

88.00%

86.00%

84.00%

82.00%

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (De g. C.)

F = 8 khz
F = 32khz

Eff v s T a @ Vin =3 .0 0 V , Io = 2 ma

100.00%

98.00%

96.00%

94.00%

92.00%

%

90.00%

Eff

88.00%

86.00%

84.00%

82.00%

-40.00 -20.00 0.00 20.00 40.00 60.00 80.00 100.00

Ta (Deg. C.)

F = 8 khz
F = 32khz

9

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

PRELIMINARY - August 11, 2000

OUTLINE DRAWING - MSOP-8

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER

SC1464

LAND PATTERN - MSOP-8

ECN 00-1246

10

© 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320