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PWM Controlled,PWM/PFM Switchable Step-up DC/DC Controllers

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GENERAL DESCRIPTION

The XC6367/68 series are multi-functional step-up DC/DC converter controllers with built-in high speed, low ON resistance

drivers.

High efficiency is possible using an externally connected transistor, coil, diode and capacitor.

Output voltage is selectable in 100mV increments within a range of 1.5V ~ 6.5V (±2.5%). For output voltages outside this

range, we recommend FB version, which has a 1.0V internal reference voltage. Using the FB version, the required output

voltage can be set-up using 2 external resistors.

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

Control switches from PWM to PFM during light loads with the XC6368 (PWM/PFM switchable) and the series is highly

efficient from light loads to large output currents.

Soft start time of XC6367/68A, B, and E series is internally set to 10msec and XC6367/68C, D, and F series regulate soft-start

time by connecting resistors and capacitors externally.

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

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APPLICATIONS

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Electronic information organizers

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Palmtops

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Cellular and portable phones

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Portable audio systems

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Various multi-function power supplies

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TYPICAL APPLICATION CIRCUIT

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TYPICAL PERFORMANCE

CHARACTERISTICS

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FEATURES

Input Voltage Range

: 0.9V ~ 10V

Operating Voltage Range : 2.0V ~ 10V

Output voltage Range : 1.5V ~ 6.5V programmable in

100mV increments (±2.5%)

Oscillation Frequency : 300kHz, 100kHz (±15%)

Custom products for

180kHz, 500kHz

Output Current

: More than 200mA

High Efficiency

: 84% (TYP.)

Stand-by capability

: ISTB=0.5μA (MAX.)

Selection

: Soft-start set-up external

Output voltage set-up external (FB)

PWM/PFM Switching Control (XC6368)

Package

: SOT-25

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GO-Compatible

ETR0401_001