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Table Of Contents

FEATURES
APPLICATIONS
DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
PACKAGE SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
PIN ASSIGNMENT
TYPICAL CHARACTERISTICS (5-V INPUT) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100-mm × 100-mm, double-sided PCB with 2-oz. copper. Applies to .
TYPICAL CHARACTERISTICS (12-V INPUT) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100-mm × 100-mm, double-sided PCB with 2-oz. copper. Applies to .
APPLICATION INFORMATION
REVISION HISTORY

GND

R #

SET

0.05W,1%

(Required)

C *

100 Fm

Electrolytic

(Required)

C *

100 Fm

Electrolytic

(Optional)

Inhibit

PTH08080W

STANDARD APPLICATION

(TopView)

*SeeTheCapacitor ApplicationInformation

#SeetheSpecificationTablefortheR value.

SET

$DiodeisRequiredWhenV 5.25VandV 16V.

O I

> >

PTH08080W

www.ti.com

SLTS235D –FEBRUARY 2005–REVISED SEPTEMBER 2013

2.25-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR

Check for Samples: PTH08080W

FEATURES

DESCRIPTION

The PTH08080W is a highly integrated, low-cost

• Up to 2.25-A Output Current at 85°C

switching regulator module that delivers up to 2.25 A

• 4.5-V to 18-V Input Voltage Range

of output current. The PTH08080W sources output

• Wide-Output Voltage Adjust

current at a much higher efficiency than a TO-220

(0.9 V to 5.5 V)

linear regulator IC, thereby eliminating the need for a

heat sink. Its small size (0.5 × 0.6 in) and flexible

• Efficiencies Up To 93%

operation creates value for a variety of applications.

• On/Off Inhibit

The input voltage range of the PTH08080W is from

• Undervoltage Lockout (UVLO)

4.5 V to 18 V, allowing operation from either a 5-V or

• Output Overcurrent Protection

12-V input bus. Using state-of-the-art switched-mode

(Nonlatching, Auto-Reset)

power-conversion technology, the PTH08080W can

step down to voltages as low as 0.9 V from a 5-V

• Overtemperature Protection

input bus, with less than 1 W of power dissipation.

• Ambient Temperature Range: –40°C to 85°C

The output voltage can be adjusted to any voltage

• Surface-Mount Package

over the range, 0.9 V to 5.5 V, using a single external

• Safety Agency Approvals:

resistor. Operating features include an undervoltage

lockout (UVLO), on/off inhibit, overcurrent protection,

UL/CUL 60950, EN60950

and overtemperature protection. Target applications

include telecommunications, test and measurement

APPLICATIONS

applications, and high-end consumer products. This

• Telecommunications, Instumentation,

product is available in both through-hole and surface-

and General-Purpose Circuits

mount package options, including tape and reel.

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.

Summary of content (18 pages)

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PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 2.25-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR Check for Samples: PTH08080W FEATURES DESCRIPTION • • • The PTH08080W is a highly integrated, low-cost switching regulator module that delivers up to 2.25 A of output current. The PTH08080W sources output current at a much higher efficiency than a TO-220 linear regulator IC, thereby eliminating the need for a heat sink. Its small size (0.5 × 0.
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PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 ELECTRICAL CHARACTERISTICS at 25°C free-air temperature, VI = 12 V, VO = 3.
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PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com PIN ASSIGNMENT TERMINAL FUNCTIONS TERMINAL NAME NO. VI 1 GND 2 VO 3 I/O I DESCRIPTION The positive input voltage power node to the module, which is referenced to common GND. This is the common ground connection for the VI and VO power connections. It is also the 0-Vdc reference for the Inhibit and VO Adjust control inputs. O The regulated positive power output with respect to the GND node.
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PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 TYPICAL CHARACTERISTICS (5-V INPUT) (3) (4) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 50 VO = 3.3 V VO − Output Voltage Ripple − mV PP 100 VO = 2.5 V Efficiency − % 90 VO = 1.2 V 80 VO = 1.8 V VO = 1 V VO = 1.5 V VO = 0.9 V 70 60 50 40 VO = 1.8 V 30 VO = 0.9 V VO = 2.5 V VO = 1 V VO = 3.3 V 20 10 VO = 1.2 V VO = 1.5 V 0 40 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0 2.25 0.25 0.5 0.75 1 1.
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PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com TYPICAL CHARACTERISTICS (12-V INPUT) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 100 100 VO = 5 V VO = 3.3 V V O − Output Voltage Ripple − mV PP VO = 2.5 V Efficiency − % 90 VO = 1.8 V VO = 1.5 V 80 VO = 1.2 V 70 60 50 (1) (2) 80 60 VO = 1.8 V VO = 3.3 V VO = 2.5 V 40 20 0.5 1 1.5 2 2.5 0 0.5 IO − Output Current − A 1 1.5 2 IO − Output Current − A Figure 7.
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PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 APPLICATION INFORMATION Adjusting the Output Voltage of the PTH08080W Wide-Output Adjust Power Modules The VO Adjust control (pin 4) sets the output voltage of the PTH08080W product. The adjustment range is from 0.9 V to 5.5 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VO Adjust and GND (pin 2).
PAGE 8
PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com Table 2. Calculated Set-Point Resistor Values 8 Va Required Rset Va Required Rset Va Required Rset 0.900 Open 1.800 8.08 kΩ 3.700 1.36 kΩ 0.925 355 kΩ 1.850 7.56 kΩ 3.750 1.32 kΩ 0.950 176 kΩ 1.900 7.09 kΩ 3.800 1.25 kΩ 0.975 117 kΩ 1.950 6.67 kΩ 3.850 1.20 kΩ 1.000 87.2 kΩ 2.000 6.28 kΩ 3.900 1.15 kΩ 1.025 69.5 kΩ 2.050 5.92 kΩ 3.950 1.10 kΩ 1.050 57.6 kΩ 2.100 5.61 kΩ 4.000 1.05 kΩ 1.
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PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 CAPACITOR RECOMMENDATIONS FOR THE PTH08080W WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum recommended input capacitor is 100 µF of capacitance. When VO > 3.4 V, the 100-µF electrolytic capacitance must be rated for 650-mArms ripple current . For VO < 3.4 V, the ripple current rating must be at least 500 mArms. The ripple current rating of electrolytic capacitors is a major consideration when they are used at the input.
PAGE 10
PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com Designing for Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1 A/µs. The typical voltage deviation for this load transient is given in the data-sheet specification table using the optional value of output capacitance.
PAGE 11
PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 Power-Up Characteristics When configured per the standard application, the PTH08080 power module produces a regulated output voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input source.
PAGE 12
PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com PTH08080W VI = 12 V 1 VO = 1.8 V 3 VO VI Inhibit 5 GND VO Adj 2 4 RSET 8.06 kW 0.05 W 1% CI L O A D CO Q1 BSS138 Inhibit GND GND Figure 12. On/Off Inhibit Control Circuit VO (1 V/div) II (0.5 A/div) Q1 VDS (5 V/div) t - Time = 5 ms/div Figure 13.
PAGE 13
PTH08080W www.ti.com SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 REVISION HISTORY Changes from Revision C (February 2008) to Revision D • Page Changed pin number to pin 2 in reference to GND for the VOAdjust pin description in the TERMINAL FUNCTIONS table. .....................................................................................................................................................................................
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.com 25-Sep-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.