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XC9801/XC9802

Series

PARAMETER

SYMBOL

CONDITIONS

UNITS

−0.3∼6.0

V

−0.3∼12.0

V

C1 + pin Voltage

C1+

V

C1 - pin Voltage

C1-

V

CE pin Voltage

V

200

mA

MSOP-8A

150

Power Dissipation

USP-8

Pd

120

mW

Operating Temperature Range

Topr

−40∼＋85

℃

Storage Temperature Range

Tstg

−40∼＋125

℃

■BLOCK DIAGRAM

■ABSOLUTE MAXIMUM RATINGS

Ta = 25

℃, GND = 0V

(1) Basic Operations

(2) Stand-by Function

Using the XC9801/02

’s clock generated by the internal oscillator, a step-up charge pump operation can be brought

about as a result of the alternate switching between operating conditions where P1 & N4 are ON with P2 & P3 OFF

the difference between the feedback voltage and the reference voltage (Vref) are compared by the internal operational

amplifier. Output voltage can be stabilized (* 2) by controlling P3

’s gate voltage waveform via the signal generated by

the internal amplifier.

By connecting SENSE to ground, the output stability function, as described above, can be halted and the IC can be

used as a step-up doubler.

* 2 : As a result of P3 gradually reaching an ON state with each clock (signal), rush current is controlled, the ripple

decreases and with the combination of the independent phase compensation circuit, output voltage is stabilized

When the voltage at CE (chip enable) is ‘low’ (0V), P1, P2 & P3 will be OFF with N4 & N5 ON. The external capacitor

(3) PFM (Pulse Skip) Operations

Whilst maintaining output voltage, the XC9802 provides the added security of protection against drops in efficiency

during light loads as a result of the pulse, generated by the internal oscillator, being skipped and the operating

frequency being changed.

Controller