CAT3200/3200-5
BLOCK DIAGRAM
CNEG CPOS
CNEG CPOS
2V
IN
2V
2MHz
Voltage
Doubler
IN
2MHz
Voltage
Doubler
IN
IN
SHDN
SHDN
EN
EN
+
+
—
—
5V/100mA
OUT
FB
1.25V
1.25V
5V
OUT
100mA
300k
100k
SGND
GND
PGND
CAT3200 Adjustable Output
CAT3200-5 5V Fixed Output
PIN FUNCTIONS
IN is the power supply. During normal operation the
device draws a supply current which is almost constant.
A very brief interval of non-conduction will occur at the
switchingfrequency.Thedurationofthenon-conduction
interval is set by the internal non-overlapping
“break-before-make” timing. IN should be bypassed
with a 1µF to 4.7µF low ESR (Equivalent Series
Resistance) ceramic capacitor.
resistor network (400kΩ). The feedback network will
result in a reverse current of 10µA to 20µA to flow back
through the device to ground.
Wheneverthedeviceistakenoutofshutdownmode,the
output voltage will experience a slew rate controlled
power-up. Full operating voltage is typically achieved in
less than 0.5 msec.
For filtering, a low ESR ceramic bypass capacitor (1µF)
incloseproximitytotheINpinpreventsnoisefrombeing
injected back into the power supply.
GNDisthegroundreferenceforallvoltagesonCAT3200-
5 devices.
SHDN is the logic control input (Active LOW) that places
the device into shutdown mode. The internal logic is
CMOS and the pin does not use an internal pull-down
resistor. The SHDN pin should not be allowed to float.
FB (CAT3200 Only) is the feedback input pin. An output
divider should be connected from OUT to FB to program
the output voltage.
CPOS,CNEGarethepositiveandnegativeconnections
respectively for the charge pump flying capacitor. A low
ESR ceramic capacitor (1µF) should be connected
between these pins. During initial power-up it may be
possibleforthecapacitortoexperienceavoltagereversal
and for this reason, avoid using a polarized (tantalum or
aluminum) flying capacitor.
PGND (CAT3200 Only). Is the same as GND for the
CAT3200-5 except for the internal reference connection
to SGND.
SGND (CAT3200 Only) Ground pin for the internal
reference. The CNEG connection is switched to this pin
during the normal charge pump operation.
OUT is the regulated output voltage to power the load.
During normal operation, the device will deliver a train of
current pulses to the pin at a frequency of 2MHz.
Adequate filtering on the pin can typically be achieved
through the use a low ESR ceramic bypass capacitor
(1µF to 4.7µF) in close proximity to the OUT pin. The
ESR of the output capacitor will directly influence the
output ripple voltage.
When the shutdown mode is entered, the output is
immediatelyisolatedfromtheinputsupply,however,the
output will remain connected to the internal feedback
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. MD-5002, Rev. L
6
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