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PWM Controlled, PWM/PFM Switchable Step-Down DC/DC Converters

■GENERAL DESCRIPTION

The XC6365/XC6366 series are multi-functional step-down DC/DC converters with built-in high speed, low ON resistance

drivers. An output current of more than 1A is possible using an externally connected transistor, coil, diode and capacitor.

standard voltage supply internal and using externally connected components, output voltage can be set up freely (FB). With

a 300kHz switching frequency, the size of the external components can be reduced.

Control switches from PWM to PFM during light loads with the XC6366 (PWM/PFM switchable) and the series is highly

efficient from light loads to large output currents.

In relation to soft-start time, both internally set-up 10ms types (A, B) and external resistor or capacitor regulated types (C, D)

are available.

During stand-by time (CE pin "Low" ), current consumption is reduced to less than 0.5μA.

With UVLO internal, the external transistor will be forcibly switched off if used below the stipulated voltage.

■APPLICATIONS

●Electronic information organizers

●Palmtops

●Cellular and portable phones

●Portable audio systems

●Various multi-function power supplies

■TYPICAL APPLICATION CIRCUIT

■FEATURES

Input Voltage Range

Output Voltage Range

: 1.5V ~ 6.0V programmable in

0.1V increments (±2.5%)

Oscillation Frequency

: 300kHz (±15%)

: Custom products for 180, 500kHz

Output Current

: More than 1.0A

High Efficiency

: 92% (TYP.)

Stand-by Capability

: ISTB=0.5μA (MAX.)

Soft-start time set-up externally type possible

Externally set-up output voltage type possible (FB)

Maximum Duty Ratio

: 100%

PWM/PFM Switching Control (XC6366)

Package

: SOT-25, USP-6C

■TYPICAL PERFORMANCE

CHARACTERISTICS

☆GreenOperation-Compatible

ETR0501_003