SMP402 Datasheet, PDF (1/16 Pages) Power Integrations, Inc. – 20-72 VDC Input Non-isolated DC Output

SMP402
1-Watt Buck Regulator IC
20-72 VDC Input
Non-isolated DC Output
Product Highlights
Integrated Power Switch and CMOS Controller
• Output power > 1 W from 48 VDC input
• Adjustable output voltage
• Integrated solution minimizes overall size
High-voltage, Low-capacitance MOSFET Output
• Designed for ISDN T1 telecommunications applications
• Low capacitance allows for high frequency operation
+
48 VDC
-
High-voltage Buck Regulator
• Internal pre-regulator self-powers the IC on start-up
• Designed for low power consumption
• Minimum external parts required
Built-In Self-protection Circuits
• Undervoltage lockout
• Thermal shutdown
• Input polarity/level sense
SMP402
Figure 1. Typical Application.
®
+
5 VDC
-
PI-555A-123091
Description
The SMP402, intended for non-isolated ISDN
telecommunications power supply applications, combines a
high voltage power MOSFET switch with a switchmode power
system controller in a monolithic integrated circuit. Few
external components are required to implement a low cost
power supply which meets stringent ISDN specifications. High
frequency operation reduces total power supply size.
The P-channel power MOSFET switch features include high
voltage, low R , and low capacitance. Lower capacitance
DS(ON)
results in a reduction in gate drive power, and also facilitates
higher frequency operation.
The controller section of the SMP402 contains all the blocks
required to drive and control the power stage: start-up pre-
regulator circuit, oscillator, bandgap reference, error amplifier,
gate driver and level shift. Protection features include
undervoltage lockout, thermal shutdown, and input polarity
and level sensing.
The SMP402 is available in a 16-pin plastic SOIC package.
VIN 1
VLS 2
ENABLE 3
D GND 4
A GND 5
SENSE+ 6
SENSE - 7
REXT 8
Figure 2. Pin Configuration.
16 OUT
15 POLARITY
14 LEVEL
13 VS
12 EA IN
11 EA OUT
10 VBIAS
9 CEXT
PI-553B-012892
ORDERING INFORMATION
PART
NUMBER
SMP402SC
PACKAGE
OUTLINE
S16A
T
j
RANGE
0 to 120°C
January 1996