SP9718 STANSON | Alldatasheet

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2007/12/20 Ver.1 Page 1 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR DESCRIPTION APPLICATIONS 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-filteri ng. The SP9718 is ideally suited for Li-Ion battery a pplications. 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.

  • Cellular Phone
  • Cordless Phone
  • PDAs and Handy-Terminals
  • CPU I/O Supplies
  • Notebook Chipset Supplies
  • Battery Operated Devices
  • ADSL FEATURES PIN CONFIGURATION ( SOP-8 Power Pad ) PART MARKING
  • 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

2007/12/20 Ver.1 Page 2 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR TYPICAL APPLCATION CIRCUIT PIN DESCRIPTION & ELECTRICAL CHARACTERISTICS Operating Rating Pin Symbol Description Min. Typ. Max. Unit 1 VIN V oltage supply for internal circuits 2 2.5 5.5 V

2 GND Ground for internal reference voltage divider

Shutdown level 0.75 x VIN VIN + 0.33 SD CMOS input level Enable level 0 2.0 V 4 VREF V OUT Set V oltage 1.1 VIN V

5 VFB Feedback node for the V OUT VREF V

6 PGND Ground for output power transistors

7 LX Inductor connection to the Drains of the internal

5.5 V 8 PVIN V oltage supply for output power transistors 2 2.5 5.5 V

2007/12/20 Ver.1 Page 3 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR BLOCK DIAGRAM PWM Controller Oscillator Ramp Generator Error Amp Thermal Protection MOS VREF GND VFB PGND LX7 PVIN VIN1 SD

ORDERING INFORMATION

Part Number Package Part Marking 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 V oltage -0.3 ~ 6.0 V PVIN PVIN Operating Range 2.0 ~ 4.0 V IOUT Output Current, Source or Sink 1.5 A TJ Operating Junction Temperature Range 150 ℃ TSTG Storage Temperature Range -65 to 150 ℃ TLEAD Lead Soldering Temperature for 5 sec. 260 ℃ Tope Operation Temperature Range -40 ~ 85 ℃ RӨJC Thermal Resistance Junction – Case (*) 50 /W ℃

2007/12/20 Ver.1 Page 4 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 VREF Adjustable Output Voltage VREF VIN V fsw Switching Frequency 1.2 MHz IOUT(RMS) Maximum Output RMS Current 1.5 A IOUT(PEAK) Maximum Output Peak Current 3 A MOSFETs RDS(ON) Drain to Source on-State Resistance PVIN=5V 250 m Ω SUPPLY IVIN Quiescent Current VFB = 1.4V LC unconnected 220 μA IPVIN VFB = 1.4V LC unconnected 500 μA

2007/12/20 Ver.1 Page 5 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR PERFORMANCE CHARACTERISTICS (TA=25 , unless otherwise specified.)℃ LOAD REGULATION Vin = 5V, VREF Input = 1.09V Iout(A) Vout(V) Vin = 5V , VREF Input = 4.04V 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.5 Iout(A ) Vout(V) LOAD TRANSIENT RESPONSE Transient Response VREF=1V, (IOUT from 1.5A- 0A) Transient Response VREF=1V, (IOUT from 0A- 1.5A) Transient Response VREF=4V，(IOUT from 1.5A- 0A) Transient Response VREF=4V，(IOUT from 0A- 1.5A)

2007/12/20 Ver.1 Page 6 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR PERFORMANCE CHARACTERISTICS (TA=25 , unless otherwise specified.)℃ VOUT OUTOUT RIPPLE AND NOISE VREF=1V, Load=0.5A VREF=1V, Load=1.0A VREF=1V, Load=1.5A VREF=4V, Load=0.5A VREF=4V, Load=1.0A VREF=4V, Load=1.5A VOLTAGE SETTING STEP RESPONSE 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 7 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR PERFORMANCE CHARACTERISTICS (TA=25 , unless otherwise specified.)℃ IN-RUSH CURRENT Vin=5V, VREF=1V, Load=1.5A, Ip-p=1.81A Vin=5V, VREF=4V, Load=1.5A, Ip-p=1.81A EFFICIENCY efficiency (VOUT=1V, load from 0.05A~1.5A) 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 90.0% 95.0% 100.0% Iout(A ) Efficiency efficiency (VOUT =4V, load from 0.05A~1.5A) 80.0% 82.0% 84.0% 86.0% 88.0% 90.0% 92.0% 94.0% 96.0% 98.0% 100.0% Iout(A) Efficiency

2007/12/20 Ver.1 Page 8 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR SOP- 8 Power Pad PACKAGE OUTLINE

2007/12/20 Ver.1 Page 9 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 pate nt or patent rights of SYNC Power Corporation. Conditions mentioned in this publication ar e subject to change without notice. This p ublication 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: 886-2-2655-8178 Fax: 886-2-2655-8468 http://www.syncpower.com