SP6652_07 Datasheet, PDF (1/16 Pages) Sipex Corporation – 1A, High Efficiency, Fixed 1.4 MHz Current Mode PWM Buck Regulator

Solved by
SP6652
TM
1A, High Efficiency, Fixed 1.4 MHz
Current Mode PWM Buck Regulator
Features
■ 1A Output Current
■ 1.4MHz Constant Frequency Operation
P_GND
1
S_GND 2
SP6652
10 _LX
9 P_VIN
■ 97% Efficiency Possible
■ 0.5µA (Max.) Shutdown Current
FB 3
COMP 4
10 Pin DFN
8S
VIN
7 SYNC
■ Adjustable Output Voltage
SD 5
6 MODE
■ No External FETs or Schottky Diode Required
■ Uses Small Value Inductors and Ceramic
Output Capacitors
applications
■ Mobile Phones
■ Low Dropout Operation: 100% Duty Cycle
■ PDAs
■ Soft Start and thermal Shutdown Protection ■ DSCs
■ Easy Frequency Synchonization
■ MP3 Players
■ Lead Free, RoHS Compliant package: l
■ USB Devices
Small (3mm X 3mm) 10 Pin DFN or MSOP ■ Point of Use Power
DESCRIPTION
The SP6652 is a high efficiency, synchronous buck regulator ideal for portable applications
using one Li-Ion cell, with up to 1A of output current. The 1.4MHz switching frequency and
PWM control loop are optimized for a small value inductor and ceramic output capacitor,
for space constrained portable designs. 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. 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 140ºC over-temperature shutdown.
Typical Application CIRCUIT
V_OUT
3.3V at 1A
340kΩ
10µF
100kΩ
4.7µH
1
P_GND
2
S_GND
LX ₁₀
P_VIN 9
3 _FB
SP6652 _{SVIN 8}
4kΩ
4 COMP
5 ^SD
SYNC 7
MODE 6
10nF
3.6V - 5.5V
V_IN
10Ω
1µF ^10µF
ENABLE
SHUTDOWN
May25-07 RevH
SP6652 1A, High Efficiency, Current Mode PWM Buck Regulator

© 2007 Sipex Corporation