TEXAS INSTRUMENTS PTH08080W Technical data

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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

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2.25-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR

PTH08080W

SLTS235A – FEBRUARY 2005 – REVISED MARCH 2005

FEATURES

• Up to 2.25-A Output Current at 85 ° C

• 4.5-V to 18-V Input Voltage Range

• Wide-Output Voltage Adjust

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

• Surface-Mount Package

• Safety Agency Approvals:

UL/CUL 60950, EN60950 VDE (Pending)

(0.9 V to 5.5 V)

• Efficiencies Up To 93%

• On/Off Inhibit

APPLICATIONS

• Telecommunications, Instumentation,

and General-Purpose Circuits

• Undervoltage Lockout (UVLO)

• Output Overcurrent Protection

(Nonlatching, Auto-Reset)

• Overtemperature Protection

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 × 0.6 in) and flexible operation creates value for a variety of applications.

The input voltage range of the PTH08080W is from 4.5 V to 18 V, allowing operation from either a 5-V or 12-V input bus. Using state-of-the-art switched-mode power-conversion technology, the PTH08080W can step down to voltages as low as 0.9 V from a 5-V input bus, with less than 1 W of power dissipation. The output voltage can be adjusted to any voltage over the range, 0.9 V to 5.5 V, using a single external resistor. Operating features include an undervoltage lockout (UVLO), on/off inhibit, overcurrent protection, and overtemperature protection. Target applications include telecommunications, test and measurement applications, and high-end consumer products. This product is available in both through-hole and surface-mount package options, including tape and reel.

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.

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.

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PTH08080W

SLTS235A – FEBRUARY 2005 – REVISED MARCH 2005

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

PTH08080 (Basic Model)

Output Voltage Part Number Description Package Designator

0.9 V - 5.5 V

(1) Add a T suffix for tape and reel option on SMD packages.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

Operating free-air temperature Over Vinrange –40 to 85 ° C

Solder reflow temperature Surface temperature of module body or pins 235 ° C

Storage temperature –40 to 125 ° C

stg

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

PTH08080WAH Horizontal T/H EUF

PTH08080WAS

(1)

Horizontal SMD EUG

(1)

PTH08080W UNIT

RECOMMENDED OPERATING CONDITIONS

Input voltage 4.5 18 V

Operating free-air temperature –40 85 ° C

PACKAGE SPECIFICATIONS

PTH08080W (Suffix AH and AS)

Weight 1.5 grams

Flammability Meets UL 94 V-O

Mechanical shock Per Mil-STD-883D, Method 2002.3, 1 ms, 1/2 sine, mounted 500 Gs

Mechanical vibration Mil-STD-883D, Method 2007.2, 20-2000 Hz 20 Gs

(1) Qualification limit.

MIN MAX UNIT

(1)

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PTH08080W

SLTS235A – FEBRUARY 2005 – REVISED MARCH 2005

ELECTRICAL CHARACTERISTICS

at 25 ° C free-air temperature, VI= 12 V, VO= 3.3 V, IO= IOmax, CI= 100 µF, C

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

ADJ

η Efficiency R

IO(trip) Overcurrent threshold Reset, followed by autorecovery 3.5 A

UVLO Undervoltage lockout V

II(stby) Input standby current Pins 5 and 2 connected 1 mA f

MTBF Calculated reliability 48 106Hr

Output current TA= 85 ° C, natural convection airflow 0 2.25 A Output power TA= 85 ° C, natural convection airflow 10 W Set-point voltage tolerance TA= 25 ° C ± 2 Temperature variation -40 ≤ TA≤ +85 ° C ±0.5 %V Line regulation Over VIrange ± 7 mV Load regulation Over IOrange ± 0.13 %V Total output voltage variation Includes set-point, line, load, -40 ≤ TA≤ +85 ° C 3 Output Voltage Adjust Range Over IOrange 0.9 5.5 V

0.9 V ≤ VO≤ 1.8 V 4.5 VOx 10

Input Voltage Range Over VOrange 1.8 V < VO≤ 3.4 V 4.5 18 V

3.4 V < VO≤ 5.5 V VO+ 2

= 348 Ω, VO= 5 V 93.5%

SET

= 1.87 k Ω, VO= 3.3 V 92%

SET

= 3.74 k Ω, VO= 2.5 V 91% TA= 25 °C, IO= 2 A

SET

= 6.19 k Ω, VO= 2 V 90%

SET

= 8.06 k Ω, VO= 1.8 V 89%

SET

= 13 k Ω, VO= 1.5 V 87.5%

SET

= 27.4 k Ω, VO= 1.2 V 86.5%

SET

Output voltage ripple 20 MHz bandwith 30 mV

CO= 100 µF, 1 Recovery time 50 µs

Transient response

A/µs load step from 50% to 100% IOmax

VOover/undershoot 70 mV

VI= increasing 4.35 4.5 VI= decreasing 3.6 4 Input high voltage (VIH) VI– 0.5 Open

Inhibit control (pin 5) Input low voltage (VIL) –0.2 0.5

Input low current (IIL) 5 µA

Switching frequency Over VIand IOranges 300 kHz External input capacitance Electrolytic type (CI) 100

Ceramic type (CO) 220

External output capacitance Nonceramic type (CO) 100

Equivalent series resistance (nonceramic) 10 Per Telcordia SR-332, 50% stress,

TA= 40 ° C, ground benign

= 100 µF (unless otherwise noted)

(2)

(4)

(7)

(1)

(2)

(3)

(5)

(6)

330

µF

m Ω

(1) The set-point voltage tolerance is affected by the tolerance and stability of R

tolerance of 1% with 100 ppm/ ° C or better temperature stability.

(2) The minimum input voltage is 4.5 V or (V

less.

+ 2) V, whichever is greater. The maximum input voltage is 18 V or VOx 10, whichever is

. The stated limit is unconditionally met if R

SET

(3) This control pin has an internal pullup to 3.3 V. If it is left open-circuit, the module operates when input power is applied. A small

low-leakage (< 100 nA) metal-oxide semiconductor field effect transistor (MOSFET) is recommended for control. See the application information for further guidance.

(4) An external 100-µF electrolytic capacitor is required across the input (V

the module.

(5) An external 100-µF electrolytic capacitor is optional across the output (V

Additional capacitance close to the load improves the response of the regulator to load transients.

and GND) for proper operation. Locate the capacitor close to

and GND). Locate the capacitor close to the module.

(6) This is the calculated maximum capacitance. The minimum ESR limitation often results in a lower value. See the capacitor application

information for further guidance.

(7) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 10 m Ω as the minimum when calculating the total

equivalent series resistance (ESR) using the maximum ESR values specified by the capacitor manufacturer.

has a

SET

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PTH08080W

SLTS235A – FEBRUARY 2005 – REVISED MARCH 2005

PIN ASSIGNMENT

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

GND 2 V

VOAdjust 4 I resistor should be 100 ppm/ ° C (or better). The set-point range is from 0.9 V to 5.5 V. The electrical

Inhibit 5 I

I/O DESCRIPTION

1 I The positive input voltage power node to the module, which is referenced to common GND.

This is the common ground connection for the VIand VOpower connections. It is also the 0-Vdc reference for the Inhibit and VOAdjust control inputs.

3 O The regulated positive power output with respect to the GND node.

A 1% resistor must be connected between this pin and GND (pin 1) to set the output voltage of the module higher than 0.9 V. If left open-circuit, the output voltage defaults to this value. The temperature stability of the

specification table gives the standard resistor value for a number of common output voltages. See the application information for further guidance.

The Inhibit pin is an open-collector/drain-negative logic input that is referenced to GND. Applying a low-level ground signal to this input disables the module's output. When the Inhibit control is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the module produces an output voltage whenever a valid input source is applied.

Figure 1. Terminal Location

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VO = 2.5 V

VO = 1.8 V

− Output Current − A

− Output Voltage Ripple − mV V

O PP

0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25

VO = 3.3 V

VO = 1 V

VO = 0.9 V

VO = 1.5 V

VO = 1.2 V

100

0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25

Efficiency − %

VO = 2.5 V

VO = 1.2 V

IO − Output Current − A

VO = 3.3 V

VO = 1.8 V

VO = 1.5 V

VO = 1 V

VO = 0.9 V

0.25 0.75 1.25 1.75 2.25

Airflow Nat Conv

− Output Current − A

Temperature Derating −  C

0.25

0.5

0.75

0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25

VO = 1.5 V

− Output Current − A

VO = 1.2 V

− Power Dissipation − W P

VO = 3.3 V

VO = 2.5 V

VO = 1.8 V

VO = 1 V

VO = 0.9 V

SLTS235A – FEBRUARY 2005 – REVISED MARCH 2005

TYPICAL CHARACTERISTICS (5-V INPUT)

EFFICIENCY OUTPUT RIPPLE

vs vs

OUTPUT CURRENT OUTPUT CURRENT

Figure 2. Figure 3.

PTH08080W

(1) (2)

POWER DISSIPATION TEMPERATURE DERATING

vs vs

OUTPUT CURRENT OUTPUT CURRENT

Figure 4. Figure 5.

(1) The electrical characteristic data has been developed from actual products tested at 25 ° C. This data is considered typical for the

converter. Applies to Figure 2 , Figure 3 , and Figure 4 .

(2) 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 x 100-mm, double-sided PCB with 2-oz. copper. Applies to Figure 5 .

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