Datasheet SP9718 Datasheet (SYNC Power) [ru]

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

DESCRIPTION

The SP9718 is low-noise pulse-width-modulated,
DC-DC step-down converter. It powers logic and
transmitters in small wireless systems such as
cellular phones, communicating PDAs, and
handy-terminals. The device features an internal
synchronous rectifier for high efficiency; it requires
no external Schottky diode. Excellent noise
characteristics and fixed-frequency operation
provide easy post-filtering. The SP9718 is ideally
suited for Li-Ion battery applications. It is also
useful for +3V or +5V fixed input applications.
The device operates in one of four modes. Forced
PWM mode operates at a fixed frequency
regardless of the load. Shutdown mode places the
device in standby, reducing quiescent supply
current to under 0.1μA.

The SP9718 can deliver over 1.5A. The output
voltage can be adjusted from VREF to VIN. The
input range is from 2.0V to 5.0V. Other features of
the SP9718 include high efficiency, low dropout
voltage. It is available in a space-saving 8-pin SOP
package.

APPLICATIONS

• Cellular Phone

• Cordless Phone

• PDAs and Handy-Terminals

• CPU I/O Supplies

• Notebook Chipset Supplies

• Battery Operated Devices

• ADSL

FEATURES

• 1.2MHz switching and synchronization

• Dynamic output-voltage adjustment from

VREF to VIN

• 1.5A Guaranteed Output Current

• 95% Efficiency

• No Schottky Diode Required

• External Soft Start

• 8-pin PSOP power packages

PIN CONFIGURATION ( SOP-8 Power Pad )

PART MARKING

2007/12/20 Ver.1 Page 1

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

TYPICAL APPLCA TION CIRCUIT

PIN DESCRIPTION

& ELECTRICAL CHARACTERISTICS

Pin Symbol Description

VIN Voltage supply for internal circuits 2 2.5 5.5 V

1

GND Ground for internal reference voltage divider

2

SD CMOS input level

3

VREF V

4

VFB Feedback node for the V

5

PGND Ground for output power transistors

6

LX

7

PVIN Voltage supply for output power transistors 2 2.5 5.5 V

8

Set Voltage 1.1 VIN V

OUT

VREF V

OUT

Inductor connection to the Drains of the internal

power MOSFETs

Shutdown level 0.75 x VIN VIN + 0.3

Enable level 0

Min. Typ. Max. Unit

Operating Rating

2.0

5.5 V

V

2007/12/20 Ver.1 Page 2

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

BLOCK DIAGRAM

VIN1

SD

PVIN

GND

VREF

2

4

ORDERING INFORMATION

Part Number Package Part Marking

1

Oscillator Ramp Generator

PW M C ontroller

Erro r Amp

5

VFB

Thermal

Protection

3

6

PGND

8

MOS

LX

7

SP9718SP8RG SOP-8 ( Power Pad ) SP9718
SP9718SP8TG SOP-8 ( Power Pad ) SP9718

※ SP9718SP8RG : 7” Tape Reel ; Pb – Free

※ SP9718SP8TG : Tube ; Pb – Free

ABSOULTE MAXIMUM RATINGS (TA=25 , unless otherwise specified.)℃

The following ratings designate persistent limits beyond which damage to the device may occur

Symbol Parameter Value Unit

.

VIN DC Supply Voltage -0.3 ~ 6.0 V

PVIN PVIN Operating Range 2.0 ~ 4.0 V

I

Output Current, Source or Sink 1.5 A

OUT

TJ Operating Junction Temperature Range 150 ℃

T

Storage Temperature Range -65 to 150 ℃

STG

T

Lead Soldering Temperature for 5 sec. 260 ℃

LEAD

Tope Operation Temperature Range -40 ~ 85 ℃
RӨJC Thermal Resistance Junction – Case (*) 50 /W℃

2007/12/20 Ver.1 Page 3

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

ELECTRICAL CHARACTERISTICS

(Unless otherwise stated, these specifications apply TA=25°C; VIN=+3.3V and PVIN=+3.3V)

Symbol Parameter Conditions Min. Typ. Max. Unit

SWITCHING REGULATOR

V

Adjustable Output Voltage

REF

fsw Switching Frequency 1.2 MHz

I

OUT(RMS)

I

OUT(PEAK)

MOSFETs

R

SUPPLY

Maximum Output RMS Current 1.5 A

Maximum Output Peak Current 3 A

Drain to Source on-State Resistance PVIN=5V 250 mΩ

DS(ON)

I

Quiescent Current

VIN

I

PVIN

2007/12/20 Ver.1 Page 4

VREF VIN V

VFB = 1.4V

LC unconnected

VFB = 1.4V

LC unconnected

220 μA

500 μA

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

PERFORMANCE CHARACTERISTICS (T

LOAD REGULATION

=25 , unless otherwise specified.)℃

A

Vin = 5V, VREF Input = 1.09V

2

1

Vout(V)

0

0.05 0.2 0.4 0.6 0.8 1
Iout(A)

LOAD TRANSIENT RESPONSE

Transient Response VREF=1V, (I

OUT

from 1.5A- 0A)

Vi n = 5V , VREF In p ut = 4.04V

5

4

Vout(V)

3

0.1

0.2

0.3

0.05

Transient Response VREF=1V, (I

0.4

0.5

Iout(A )

0.6

0.7

OUT

0.9

1

1.5

0.8

from 0A- 1.5A)

Transient Response VREF=4V，(I

2007/12/20 Ver.1 Page 5

from 1.5A- 0A)

OUT

Transient Response VREF=4V，(I

from 0A- 1.5A)

OUT

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

PERFORMANCE CHARACTERISTICS (T

VOUT OUTOUT RIPPLE AND NOISE

=25 , unless otherwise specified.)℃

A

VREF=1V, Load=0.5A

VREF=4V, Load=0.5A

VOLTAGE SETTI NG STEP RESPONSE

VREF=1V, Load=1.0A

VREF=4V, Load=1.0A

VREF=1V, Load=1.5A

VREF=4V, Load=1.5A

VREF=1V-4V, Load=0.5A

VREF=1V-4V, Load=1.0A

VREF=1V-4V, Load=1.5A

VREF=4V-1V, Load=0.5A

VREF=4V-1V, Load=1.0A

VREF=4V-1V, Load=1.5A

2007/12/20 Ver.1 Page 6

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

PERFORMANCE CHARACTERISTICS (T

IN-RUSH CURRENT

=25 , unless otherwise specified.)℃

A

Vin=5V, VREF=1V, Load=1.5A, Ip-p=1.81A

Vin=5V, VREF=4V, Load=1.5A, Ip-p=1.81A

EFFICIENCY

100.0%

95.0%

90.0%

85.0%

80.0%

75.0%

Efficiency

70.0%

65.0%

60.0%

efficiency (V

05

.

0

=1V, load from 0.05A~1.5A)

OUT

0.2

0.4

6

0.

Iout(A )

0.8

efficiency (V

100.0%

98.0%

96.0%

94.0%

92.0%

90.0%

88.0%

Efficiency

86.0%

84.0%

82.0%

1

80.0%

0.05 0.2 0.4 0.6 0.8 1

=4V, load from 0.05A~1.5A)

OUT

Iout(A)

2007/12/20 Ver.1 Page 7

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

SOP- 8 Power Pad PACKAGE OUTLINE

2007/12/20 Ver.1 Page 8

SP9718

1.5A LOW-NOISE PWM STEP-DOWN REGULATOR

Information provided is alleged to be exact and consistent. SYNC Power Corporation presumes no responsibility for the
penalties of use of such information or for any violation of patents or other rights of third parties, which may result from its use.
No license is granted by allegation or otherwise under any patent or patent rights of SYNC Power Corporation. Conditions
mentioned in this publication are subject to change without notice. This publication surpasses and replaces all information
previously supplied. SYNC Power Corporation products are not authorized for use as critical components in life support
devices or systems without express written approval of SYNC Power Corporation.

©The SYNC Power logo is a registered trademark of SYNC Power Corporation

©2004 SYNC Power Corporation – Printed in Taiwan – All Rights Reserved

SYNC Power Corporation

7F-2, No.3-1, Park Street

NanKang District (NKSP), Taipei, Taiwan, 115, R.O.C

Phone: [phone]

Fax: [phone]

http://www.syncpower.com

2007/12/20 Ver.1 Page 9