Datasheet

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FEATURES

APPLICATIONS

DESCRIPTION

STANDARD APPLICATION

GND

SET

(Required)

5 4

PTH04070W

(Top View)

C3*

47 mF

Electroytic

(Recommended)

C2*

47 mF

Ceramic

(Required)

C1*

47 mF

Ceramic

(Required)

Inhibit

*See The Capacitor Application Information

#See The Specification Table for Value

0.05 W

, 1%

PTH04070W

SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007

www.ti.com

3-A, 3.3/5-V INPUT ADJUSTABLE SWITCHING REGULATOR

• Surface Mount Package

• Up to 3-A Output Current at 85 ° C • Safety Agency Approvals:

UL/IEC/CSA-C22.2 60950-1

• 3.3-V / 5-V Input Voltage

• Wide-Output Voltage Adjust

(0.9 V to 3.6 V)

• Telecommunications, Instumentation,

• 160 W/in

Power Density

and General-Purpose Circuits

• Efficiencies Up To 94%

• On/Off Inhibit

• Undervoltage Lockout (UVLO)

• Output Overcurrent Protection

(Nonlatching, Auto-Reset)

• Overtemperature Protection

• Ambient Temp. Range: – 40 ° C to 85 ° C

The PTH04070W is a highly integrated, low-cost switching regulator module that delivers up to 3 A of output

current. Occupying less PCB area than a standard TO-220 linear regulator IC, the PTH04070W provides output

current at a much higher efficiency and with much less power dissipation, thereby eliminating the need for a heat

sink. Their small size (0.5 × 0.4 in), high efficiency, and low cost makes these modules attractive for a variety of

applications.

The input voltage range of the PTH04070W is from 3 V to 5.5 V, allowing operation from either a 3.3-V or 5-V

input bus. Using state-of-the-art switched-mode power-conversion technology, the PTH04070W can step down to

voltages as low as 0.9 V from a 5-V input bus, with typically less than 1 W of power dissipation. The output

voltage can be adjusted to any voltage over the range, 0.9 V to 3.6 V, using a single external resistor. Operating

features include an undervoltage lockout (UVLO), on/off inhibit, output overcurrent protection, and

overtemperature protection. Target applications include telecommunications, test and measurement applications,

and high-end consumer products. The modules are available in both through-hole and surface-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 (17 pages)

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PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 3-A, 3.3/5-V INPUT ADJUSTABLE SWITCHING REGULATOR • • FEATURES 1 • • • • • • • • • • Up to 3-A Output Current at 85°C 3.3-V / 5-V Input Voltage Wide-Output Voltage Adjust (0.9 V to 3.6 V) 160 W/in3 Power Density Efficiencies Up To 94% On/Off Inhibit Undervoltage Lockout (UVLO) Output Overcurrent Protection (Nonlatching, Auto-Reset) Overtemperature Protection Ambient Temp.
PAGE 2
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.
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PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 ELECTRICAL CHARACTERISTICS at 25C free-air temperature, VI = 5 V, VO = 3.3 V, IO = IO(Max), C1 = 47 μF, C2 = 47 μF (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT IO Output current TA = 85°C, natural convection airflow 0 3 VI Input voltage range Over IO range 3 5.5 VO(tol) Set-point voltage tolerance TA = 25°C Temperature variation -40 ≤ TA ≤ +85°C ±0.
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PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 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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PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS (5-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 20 100 VO = 2.5 V VO = 2 V V O − Output Voltage Ripple − mV PP VO = 3.3 V Efficiency − % 90 80 VO = 1.8 V VO = 1.5 V VO = 1.2 V VO = 1 V 70 60 50 16 12 8 4 0 0 0.5 1 1.5 2 2.5 0 3 0.5 IO − Output Current − A 1.5 2 2.5 Figure 1. Figure 2.
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PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS (3.3-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 20 100 VI = 1.8 V VI = 1.5 V 90 Efficiency − % V O − Output Voltage Ripple − mV PP VI = 2 V 80 VI = 1.2 V VI = 1 V 70 60 50 0 0.5 1 1.5 2 2.5 12 8 4 0 3 0 0.5 1 1.5 2 2.5 IO − Output Current − A IO − Output Current − A Figure 5. Figure 6.
PAGE 7
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 APPLICATION INFORMATION Adjusting the Output Voltage of the PTH04070W Wide-Output Adjust Power Modules The VOAdjust control (pin 4) sets the output voltage of the PTH04070W product. The adjustment range is from 0.9 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VOAdjust and GND pin 2.
PAGE 8
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 Table 2. Calculated Set-Point Resistor Values 8 VO Req'd (V) RSET (kΩ) VO Req'd (V) RSET(kΩ) VO Req'd (V) RSET(kΩ) 0.900 Open 1.475 12.3 2.55 2.16 0.925 353 1.50 11.6 2.60 2.00 0.950 175 1.55 10.5 2.65 1.85 0.975 116 1.60 9.49 2.70 1.71 1.000 85.9 1.65 8.64 2.75 1.58 1.025 68.0 1.70 7.90 2.80 1.45 1.050 56.2 1.75 7.24 2.85 1.33 1.075 47.7 1.80 6.66 2.90 1.22 1.100 41.3 1.85 6.
PAGE 9
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 CAPACITOR RECOMMENDATIONS for the PTH04070W WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum recommended input capacitor(s) is 47-μF of ceramic capacitance, in either an X5R or X7R temperature tolerance. The ceramic capacitors should be located within 0.5 in. (1,27 cm) of the regulator's input pins. Electrolytic capacitors can also be used at the input, but only in addition to the required ceramic capacitance.
PAGE 10
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 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
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 Power-Up Characteristics When configured per the standard application, the PTH04070W 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
PTH04070W www.ti.com SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 Output On/Off Inhibit For applications requiring output voltage on/off control, the PTH04070W power module incorporates an output on/off Inhibit control (pin 5). The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 13-Nov-2010 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.