PTN78000W_08 Datasheet, PDF (1/25 Pages) Texas Instruments – 1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR

PTN78000W, PTN78000H
www.ti.com...................................................................................................................................... SLTS230C – NOVEMBER 2004 – REVISED SEPTEMBER 2008
1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR
FEATURES
1
• 1.5-A Output Current
• Wide-Input Voltage
(7 V to 36 V) / (15 V to 36 V)
• Wide-Output Voltage Adjust
(2.5 V to 12.6 V) / (11.85 V to 22 V)
• High Efficiency (Up to 95%)
• On/Off Inhibit
• Undervoltage Lockout
• 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
STANDARD APPLICATION
V_I
Inhibit
C_I(A)
Ceramic
(Required)
1
1
2
PTN78000
(Top View)
3
R_SET(B)
0.05 W, 1 %
(Required)
5
V_O
+
4
C_O(A)
100 mF
Electrolytic
(Required)
DESCRIPTION
The PTN78000 is a series of high-efficiency,
step-down Integrated Switching Regulators (ISR),
that represent the third generation in the evolution of
the popular 78ST100 series of products. In new
designs it should be considered in place of the
78ST100, PT78ST100, PT5100, and PT6100 series
of single in-line pin (SIP) products. The PTN78000 is
smaller and lighter than its predecessors, and has
either similar or improved electrical performance
characteristics. The case-less, 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
PTN78000 provides high-efficiency, step-down
voltage conversion for loads of up to 1.5 A. The
output voltage is set using a single external resistor.
The PTN78000W may be set to any value within the
range, 2.5 V to 12.6 V, and the PTN78000H from
11.85 V to 22 V. The output voltage of the
PTN78000W can be as little as 2 V lower than the
input, allowing operation down to 7 V, with an output
voltage of 5 V. The output voltage of the PTN78000H
can be as little as 3 V lower than the input, alowing
operation down to 15 V, with an output voltage of
12 V.
The PTN78000 has undervoltage lockout and an
integral on/off inhibit. The modules are suited to a
wide variety of general-purpose applications that
operate off 12-V, 24-V, or 28-V_DC power.
GND
GND
(A) See the Application Information section for
capacitor recommendations. The minimum input
capacitance is 2.2 µF for PTN78000W, and 9.4 µF (2
x 4.7 µF) for PTN78000H.
(B) R_SET is required to adjust the output voltage
higher than 2.5 V for PTN78000W, and high than
11.824 V for PTN78000H. See the Application
Information section for specific values.
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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.
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