SP6652 Datasheet, PDF (1/11 Pages) Sipex Corporation – 1A, High Efficiency, High Frequency Current Mode PWM Buck Regulator

®
SP6652
1A, High Efficiency, High Frequency Current Mode PWM
Buck Regulator
FEATURES
■ 1A Output Current
■ 1.2MHz Constant Frequency Operation
■ 97% Efficiency Possible
■ Pin Selectable Forced PWM or PWM/PFM Modes
P_GND 1
S_GND 2
FB 3
COMP 4
SP6652
10 Pin MSOP
10 LX
9 P_VIN
8 _SVIN
7 _SYNC
■ Ultra Low Quiecent Current in PFM Mode: 50µA
SD 5
6 _MODE
■ 500nA (Max.) Shutdown Current
■ Output Adjustable Down to 0.75V
Now Available in Lead Free Packaging
■ No External FET's or Schottky Diode Required
■ Uses Small Value Inductors and Ceramic
Output Capacitors
■ Low Dropout Operation: 100% Duty Cycle
■ Soft Start and Thermal Shutdown Protection
■ Easy Frequency Synchonization
■ Small 10 Pin MSOP and 10 Pin DFN Package
APPLICATIONS
■ Mobile Phones
■ PDA's
■ DSC's
■ MP3 Players
■ USB Devices
■ Point of Use Power
DESCRIPTION
The SP6652 is high efficiency, synchronous buck regulator ideal for portable applications using
one Li-Ion cell, with up to 1A output current. The 1.2MHz switching frequency and PWM control
loop are optimized for small value inductor and ceramic output capacitor, for space constrained
portable designs. At light load, the SP6652 can operate in either PFM mode for high efficiency,
or PWM mode for constant frequency. In addition, the input voltage range of 2.7V to 5.5V;
excellent transient response, output accuracy, and ability to transition into 100% duty cycle
operation, further extending useful battery life, make the SP6652 a superior choice for a wide
range of portable power applications. The output voltage is externally programmable down to
0.75V. A logic level shutdown control, external clock synchronization, and forced-PWM or
automatic control inputs are provided. Other features include soft-start, over current protection
and 140(C over-temperature shutdown.
VOUT
3.3V at 1A
340k
100k
10µF
TYPICAL APPLICATION SCHEMATIC
4.7µF
1 P_GND
LX 10
2 _SGND
PVIN ⁹
3 _FB
SP6652 _SVIN 8
4
COMP
7
SYNC
8k
5
SD
6
MODE
VIN
10µF
6.2nF
ENABLE
SHUTDOWN
Date:5/25/04
SP6652 1A, High Efficiency, High Frequency Current Mode PWM Buck Regulator
1
© Copyright 2004 Sipex Corporation