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 ) 2007/12/20 Ver.1 PART MARKING Page 1 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR TYPICAL APPLCATION CIRCUIT PIN DESCRIPTION & ELECTRICAL CHARACTERISTICS Pin Symbol Operating Rating Min. Typ. Max. 2 2.5 5.5 Description 1 VIN Voltage supply for internal circuits 2 GND Ground for internal reference voltage divider 3 SD CMOS input level 4 VREF VOUT Set Voltage 5 VFB Feedback node for the VOUT 6 PGND Ground for output power transistors 7 LX Inductor connection to the Drains of the internal power MOSFETs 8 PVIN Voltage supply for output power transistors 2007/12/20 Ver.1 Shutdown level Enable level VIN + 0.3 V 0.75 x VIN 0 2.0 1.1 VIN VREF 2 Unit V 2.5 V V 5.5 V 5.5 V Page 2 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR BLOCK DIAGRAM GND V IN 1 SD P V IN 1 3 8 2 O s c illa to r R a m p G en e rator P W M C o ntroller VREF 4 MOS 7 LX T h erm a l P ro te c tion E rror A m p 5 6 PGND VFB ORDERING INFORMATION Part Number Package Part Marking SP9718SP8RG SOP-8 ( Power Pad ) SP9718SP8TG SOP-8 ( Power Pad ) ※ SP9718SP8RG : 7” Tape Reel ; Pb – Free SP9718 SP9718 ※ 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 VIN PVIN IOUT TJ TSTG TLEAD Tope RӨJC 2007/12/20 Parameter DC Supply Voltage PVIN Operating Range Output Current, Source or Sink Operating Junction Temperature Range Storage Temperature Range Lead Soldering Temperature for 5 sec. Operation Temperature Range Thermal Resistance Junction – Case (*) Ver.1 Value Unit -0.3 ~ 6.0 2.0 ~ 4.0 1.5 150 -65 to 150 260 -40 ~ 85 50 V V A ℃ ℃ ℃ ℃ ℃/W 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 SWITCHING REGULATOR VREF Adjustable Output Voltage fsw Switching Frequency IOUT(RMS) Maximum Output RMS Current IOUT(PEAK) Maximum Output Peak Current MOSFETs RDS(ON) Drain to Source on-State Resistance SUPPLY IVIN Quiescent Current IPVIN 2007/12/20 Ver.1 Conditions Min. Typ. VREF Max. Unit VIN V MHz A A 1.2 1.5 3 PVIN=5V VFB = 1.4V LC unconnected VFB = 1.4V LC unconnected 250 mΩ 220 μA 500 μA Page 4 SP9718 1.5A LOW-NOISE PWM STEP-DOWN REGULATOR PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.) LOAD REGULATION Vin = 5V , VREF Input = 4.04V Vin = 5V, VREF Input = 1.09V 5 Vout(V) 1 0 4 Iout(A) 1.5 1 0.9 0.8 0.7 0.6 1 0.5 0.8 0.4 0.6 0.3 0.4 0.2 0.2 0.1 3 0.05 0.05 Vout(V) 2 Iout(A) 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 5 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 6 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) efficiency (VOUT =4V, load from 0.05A~1.5A) 100.0% 95.0% 85.0% Efficiency Efficiency 90.0% 80.0% 75.0% 70.0% 65.0% Iout(A) 2007/12/20 Ver.1 1 0. 8 0. 6 0. 4 0. 2 0. 05 60.0% 100.0% 98.0% 96.0% 94.0% 92.0% 90.0% 88.0% 86.0% 84.0% 82.0% 80.0% 0.05 0.2 0.4 0.6 0.8 1 Iout(A) 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: 886-2-2655-8178 Fax: 886-2-2655-8468 http://www.syncpower.com 2007/12/20 Ver.1 Page 9