PTN78000A
www.ti.com
SLTS246A – APRIL 2005 – REVISED MAY 2005
1.5-A, WIDE-INPUT ADJUSTABLE BUCK-BOOST SWITCHING REGULATOR
FEATURES
•
•
•
•
•
•
•
•
1.5-A Output Current
Wide-Input Voltage
(7 V to 29 V)
Wide-Output Voltage Adjust
(–15 V to –3 V)
High Efficiency (Up to 84%)
Output Current Limit
Overtemperature Shutdown
Operating Temperature: –40°C to 85°C
Surface-Mount Package Available
APPLICATIONS
•
General-Purpose, Industrial Controls,
HVAC Systems, Test and Measurement,
Medical Instrumentation, AC/DC Adaptors,
Vehicles, Marine, and Avionics
DESCRIPTION
The PTN78000A is a series of high-efficiency, buck-boost integrated switching regulators (ISR), that represent
the third generation in the evolution of the PT78NR100 series of products. In new designs, it should be
considered in place of the PT78NR100 series of single in-line pin (SIP) products. The PTN78000A is smaller and
lighter than its predecessor, and has either similar or improved electrical performance characteristics. The
caseless, double-sided package also exhibits improved thermal characteristics, and is compatible with TI's
roadmap for RoHS and lead-free compliance.
Operating from a wide-input voltage range, the PTN78000A provides high-efficiency, positive-to-negative voltage
conversion for loads of up to 1.5 A. The output voltage is set using a single external resistor, and may be set to
any value within the range, –15 V to –3 V.
The PTN78000A has undervoltage lockout, and is suited to a wide variety of general-purpose applications that
operate off 12-V, 24-V, or tightly regulated 28-V dc power.
GND
STANDARD APPLICATION
V
I
1
PTN78000A
(Top View)
5
2
3
+
4
R
SET
#
1 %, 0.05 W
(Required)
C3*
100
m
F
Electrolytic
(Required)
C1*
100
m
F
Electrolytic
(Required)
GND
C2*
2 x 4.7
m
F
Ceramic
(Required)
V
O
*See the
Application Information
for capacitor recommendation.
#R
SET
is required to adjust the output voltage lower than -3 V. See the
Application Information
for values.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
