ANALOG
PRODUCTS
PC33997
FACT SHEET
PC33997 3.3 / 5.0 VOLT SWITCHING POWER SUPPLY
The PC33997 is a multiple output, medium power, integrated supply operating from a 5.5
to 40 V input source. A 5.0 V output is provided by a sensorless current mode step-down
switching supply. A 3.3 V output is provided by a linear regulator using an external pass
transistor.
An additional 3.3 V output is provided for standby use along with two internally protected
low R
DS(on)
LDMOS 5.0 V outputs for sensor use. Separate Enable inputs provide main
and sensor supply output control with reset and power-on reset delay.
The PC33997 provides
power supply sequencing
for advanced microproces-
sor architectures such as
the Motorola MPC5xx and
683xx microprocessor
families.
PC33997
KA_VPWR VSW
VPWR
VDDH
5.0 V
VREF1
DRVL
5.0 V
VREF2
FBL
VKAM
5.0 V
MCU
3.3 V
EN
3.3 V
SNSEN
PWROK
GND
VKAMOK
CUSTOMER BENEFITS
鈥?Low system cost, optimized performance/cost ratio
鈥?Reduced component count, simple circuit implementation
鈥?Simplified microprocessor power supply design due to
proper power sequencing
鈥?Easily used in non-microprocessor applications
鈥?Switching converter improves power efficiency
鈥?Internal safety features with output voltage supervisory
circuits
Performance
Operating Voltage
Output Voltages V
DDH
V
DDL
Standby
V
KAM
Sensor Supply V
REF1
Sensor Supply V
REF2
Regulation
V
DDH
V
DDL
V
KAM
Operating Temp
Typical Values
5.5 V - 40 V
5.0 V @ 1400 mA
3.3 V @ 400 mA
3.3 V @ 10 mA
5.0 V @ 200 mA
5.0 V @ 200 mA
鹵 0.1 V
鹵 0.15 V
鹵 0.3 V
-40擄C 鈮?T
A
鈮?125擄C
SWITCHING
Simplified Application Diagram
POWER MANAGEMENT
APPLICATIONS
鈥?Automotive Control
Module Supply
鈥?Industrial Control
Module Supply
鈥?Set Top Boxes
鈥?xDSL Module Supply
1
2
