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SP6652EU/TR Datasheet

  • SP6652EU/TR

  • 1A, High Efficiency, High Frequency Current Mode PWM Buck Re...

  • 11頁

  • SIPEX

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廬
SP6652
1A, High Efficiency, High Frequency Current Mode PWM
Buck Regulator
FEATURES
P
GND
1
10
LX
鈻?/div>
1A Output Current
S
GND
2
9
P
VIN
SP6652
鈻?/div>
1.2MHz Constant Frequency Operation
8
S
VIN
FB
3
鈻?/div>
97% Efficiency Possible
10 Pin MSOP
7
SYNC
COMP
4
鈻?/div>
Pin Selectable Forced PWM or PWM/PFM Modes
6
MODE
SD
5
鈻?/div>
Ultra Low Quiecent Current in PFM Mode: 50碌A
鈻?/div>
500nA (Max.) Shutdown Current
Now Available in Lead Free Packaging
鈻?/div>
Output Adjustable Down to 0.75V
鈻?/div>
No External FET's or Schottky Diode Required
APPLICATIONS
鈻?/div>
Uses Small Value Inductors and Ceramic
鈻?/div>
Mobile Phones
Output Capacitors
鈻?/div>
PDA's
鈻?/div>
Low Dropout Operation: 100% Duty Cycle
鈻?/div>
DSC's
鈻?/div>
Soft Start and Thermal Shutdown Protection
鈻?/div>
MP3 Players
鈻?/div>
Easy Frequency Synchonization
鈻?/div>
USB Devices
鈻?/div>
Small 10 Pin MSOP and 10 Pin DFN Package
鈻?/div>
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.
TYPICAL APPLICATION SCHEMATIC
V
OUT
3.3V at 1A
340k
4.7碌F
1
2
3
4
5
P
GND
S
GND
FB
COMP
SD
LX
P
VIN
SP6652
S
VIN
SYNC
MODE
100k
10碌F
8k
10
9
8
7
6
V
IN
10碌F
6.2nF
ENABLE
SHUTDOWN
Date:5/25/04
SP6652 1A, High Efficiency, High Frequency Current Mode PWM Buck Regulator
漏 Copyright 2004 Sipex Corporation
1

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