XC9801(2003) Ver la hoja de datos (PDF) - TOREX SEMICONDUCTOR
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XC9801 Datasheet PDF : 10 Pages
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XC9801/02 Series
Step-Up Charge Pump ICs
Block Diagram
VIN
N5
Chip
CE
Enable
C1+
C1-
P1
P2
N4
P3
Oscillator
Controler
Vref
VOUT
SENSE
GND
PGND
(1) Basic Operations
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
(or) P1 & N4 are OFF with P2 & P3 ON. By connecting the SENSE pin to VOUT, output voltage can be fedback and
the difference between the feedback voltage and the reference voltage (Vref) are compared by the internal operational
amplifier. Output voltage can be stabilized (Note 2) by controlling P3’s gate voltage waveform via the signal generated
by the internal amplifier.
Please note that this stabilizing function will not operate with VIN < (VOUT/2) or VIN ≥ VOUT.
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.
Note 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
(2) Stand-by Function
When the voltage at CE (chip enable) is ‘low’ (0V), P1,P2 & P3 will be OFF with N4 & N5 ON. The external capacitor
C1 will discharge and impedance at Vout will be high.
(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.
Absolute Maximum Ratings
PARAMETER
VIN pin voltage
VOUT pin voltage
C1 + pin voltage
C1 - pin voltage
CE pin voltage
VOUT pin output current
Power dissipation MSOP-8A
USP-8
Operating Temperature
Storage Temperature
SYMBOL
VIN
VOUT
C1+
C1-
VCE
IOUT
Pd
Topr
Tstg
Ta = 25 OC, GND = 0V
CONDITIONS
UNITS
-0.3 ~ 6
V
-0.3 ~ 12
V
-0.3 ~ VOUT + 0.3
V
-0.3 ~ VOUT + 0.3
V
-0.3 ~ VIN + 0.3
V
200
mA
150
TBD
mW
- 40 ~ + 85
OC
- 40 ~ + 125
OC
2
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