PWM Controlled,PWM/PFM Switchable Step‐down DC/DC Converters

Series

577

5

■General Description

■Features

■Applications

■Typical Application Circuit

■Typical Performance

Characteristic

The XC6376/77 series are step-down DC/DC converters with built-in P-

channel power MOSFETs. A highly efficient DC/DC converter with output

currents of 500mA can be realised using only four peripherals - a coil, a

diode and 2 capacitors.

Output voltage can be internally set-up in 0.1V increments (±2.5%)

set-up at will using a 1.0V internal reference voltage source and

peripherals (FB type). It is possible to reduce the size of the peripherals

used since the switching frequency is 300kHz.

The PWM//PFM switchable XC6377 operates in PFM mode during light

loads and is highly efficient from light loads to large output currents.

Required values for soft start time can be regulated via the external

capacitor and the stand-by function reduces supply current to less than

2.5

µA.

U.V.L.O and protection are built-in.

Input voltage range

: 1.8V~10V

Output voltage range : 1.5V~6.0V programmable in 0.1V steps

(±2.5%)

Oscillator frequency : 300kHz (±1.5%)

: Custom products for 180, 500kHz

Max. output current

High Efficiency

: 95% (typ.)

Stand-by capability

µA (max.)

Soft-start time set-up externally type

Externally set-up output voltage type (FB)

Pchannel Power MOSFET built-in

Package

: SOP-8

GElectronic Information Organizers

GPalmtops

GCellular and portable phones

GPortable Audio Systems

GVarious Multi-function Power Supplies

NP-Channel Power MOSFET Built-in

NMaximum Output Current : 500mA

NOutput Voltage Range

: 1.5~6.0V

NOscillator Frequency

: 300kHz

NMaximum Duty Ratio

: 100%

NHigh Efficiency

: 95%

NSOP-8 Package

0

40

20

60

80

100

0.1

1

10

100

1000

XC6377A333

5.0V

L＝22μH（CR54）

8.0V

（Tantalum）

（Tantalum）

1

2

3

4

8

7

6

5

L

CE/

SD1

Css

05S_3XC6376/77 02.09.12 15:20 ページ 577