Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPTH08000WAH

2.25-A, WIDE INPUT, ADJUSTABLE SWITCHING REGULATOR

FEATURES

APPLICATIONS

DESCRIPTION

PTH08000W

(TopView)

Track

GND

R #

1%,0.05W

(Required)

SET

Inhibit

100 F

(Required)

100 F

(Optional)

GND

STANDARD APPLICATION

*Seethe ApplicationInformationsectionforcapacitorrecommendations.

#Seethe ApplicationInformationsectionforR values.

SET

PTH08000W

SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008

www.ti.com

WITH AUTO-TRACK™ SEQUENCING

• Safety Agency Approvals:

UL/CUL 60950, EN60950

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

• 4.5-V to 14-V Input Voltage Range

• Wide-Output Voltage Adjust

• Telecommunications, Instrumentation,

(0.9 V to 5.5 V)

and General-Purpose Circuits

• Efficiencies Up to 94%

• On/Off Inhibit

• Undervoltage Lockout (UVLO)

• Output Overcurrent Protection

(Nonlatching, Auto-Reset)

• Overtemperature Protection

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

• Surface-Mount Package

The PTH08000W is a highly integrated, low-cost switching regulator module that delivers up to 2.25 A of output

current. The PTH08000W sources output current at a much higher efficiency than a TO-220 linear regulator IC,

eliminating the need for a heatsink. The small size (0.75 inch × 0.5 inch) and flexible operation creates value for

a variety of applications.

The input voltage range of the PTH08000W is 4.5 V to 14 V, allowing operation from either a 5-V or 12-V input

bus. Using state-of-the-art switched-mode power-conversion technology, the PTH08000W 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. This series includes

Auto-Track™ sequencing. This feature simplifies the task of supply voltage sequencing in a power system by

enabling modules to track each other, or any external voltage, during power up and power down. 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. The PTH08000W is compatible with TI's roadmap for RoHS and lead-free compliance.

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.

2 Auto-Track, POLA, TMS320 are trademarks of Texas Instruments.

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 (20 pages)

PAGE 1
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 2.25-A, WIDE INPUT, ADJUSTABLE SWITCHING REGULATOR WITH AUTO-TRACK™ SEQUENCING • FEATURES 1 • Up to 2.25-A Output Current at 85°C • 4.5-V to 14-V Input Voltage Range • Wide-Output Voltage Adjust (0.9 V to 5.
PAGE 2
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 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.
PAGE 3
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 ELECTRICAL CHARACTERISTICS at 25°C free-air temperature, VI = 12 V, VO = 3.3 V, IO = IOmax, CI = 100 µF (unless otherwise noted) PARAMETER TEST CONDITIONS MIN MAX UNIT 0 TYP 2.
PAGE 4
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 PIN ASSIGNMENT 1 2 3 6 PTH08000W (Top View) 5 4 TERMINAL FUNCTIONS TERMINAL NAME NO. GND I/O This is the common ground connection for the VI and VO power connections. It is also the 0-VDC reference for the Inhibit , VO Adjust, and Track control inputs. 1 Track 2 DESCRIPTION I This is an analog control input that enables the output voltage to follow an external voltage.
PAGE 5
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 TYPICAL CHARACTERISTICS (5-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT 100 50 VO- Output Voltage Ripple - mVPP VO = 2.5 V VO = 3.3 V 95 OUTPUT RIPPLE vs OUTPUT CURRENT Efficiency - % 90 85 80 VO = 1.5 V 75 VO = 1.8 V 70 VO = 1.2 V VO = 1 V 65 60 VO = 0.9 V 55 50 0 0.5 1 1.5 2 40 VO = 0.9 V 30 VO = 1.8 V 20 VO = 1.5 V 10 2.25 0 0.5 1.5 2 2.25 Figure 2.
PAGE 6
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 TYPICAL CHARACTERISTICS (12-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT RIPPLE vs OUTPUT CURRENT 100 100 VO - Output Voltage Ripple - mVPP VO = 3.3 V VO = 5 V Efficiency - % 90 80 VO = 1.8 V 70 VO = 1.5 V VO = 2.5 V 60 VO = 1.2 V 50 40 0 0.5 1 1.5 2 VO = 1.8 V 85 VO = 1.2 V 55 40 25 10 2.25 0 0.5 2 2.25 POWER DISSIPATION vs OUTPUT CURRENT TEMPERATURE DERATING vs OUTPUT CURRENT 90 VO = 5 V 0.
PAGE 7
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 APPLICATION INFORMATION Adjusting the Output Voltage of the PTH08000W Wide-Output Adjust Power Modules The VO Adjust control (pin 5) sets the output voltage of the PTH08000W 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 1).
PAGE 8
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 Table 2. Calculated Set-Point Resistor Values 8 VO Required RSET VO Required RSET VO 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.
PAGE 9
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 CAPACITOR RECOMMENDATIONS FOR THE PTH08000W WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum required 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
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 Table 3. Recommended Input/Output Capacitors CAPACITOR CHARACTERISTICS (1) QUANTITY WORKING VOLTAGE (V) VALUE (µF) EQUIVALENT SERIES RESISTANCE (ESR) (Ω) 85°C MAXIMUM RIPPLE CURRENT (IRMS) (mA) Panasonic WA (SMT) FC (SMT) 20 25 150 220 0.026 0.150 3700 670 10 × 10,2 10 × 10,2 1 1 ≤2 1 EEFWA1D151P EEVFC1E221P Panasonic SL SP-cap(SMT) 6.3 6.3 47 120 0.018 0.
PAGE 11
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 Features of the PTH/PTV Family of Nonisolated, Wide-Output Adjustable Power Modules POLA™ Compatibility The PTH/PTV family of nonisolated, wide-output adjustable power modules from Texas Instruments are optimized for applications that require a flexible, high-performance module that is small in size. Each of these products are POLA™ compatible.
PAGE 12
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 less than 5 ms) before allowing the output voltage to rise. The output then progressively rises to the module set-point voltage. Figure 11 shows the soft-start power-up characteristic of the PTH08000W, operating from a 12-V input bus and configured for a 3.3-V output. The waveforms were measured with a 2-A resistive load and the Auto-Track feature disabled.
PAGE 13
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 VO (2 V/div) II (500 mA/div) VINH (2 V/div) t - Time = 4 ms/div Figure 13. Power-Up Response From Inhibit Control Auto-Track™ Function The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track was designed to simplify the amount of circuitry required to make the output voltage from each module power up and power down in sequence.
PAGE 14
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 U1 2 5 VOAdj Track VO1 = 3.3 V 12 V 3 6 Inhibit GND 4 C1 VO PTH08000W VI 1 C2 1.89 kW U3* TL7712A 8 VCC 7 SENSE 5 RESET 2 RESIN 3 U2 REF RESET CT 3.3 mF 5 VOAdj Track CT GND CREF 0.1 mF 2 6 4 3 RRST 10 kW VI PTH08000W Inhibit + C5 VO VO2 = 2.5 V 6 GND + 1 1 4 C6 3.75 kW *Use TPS3808G50 with 5-V input bus modules. Figure 14.
PAGE 15
PTH08000W www.ti.com SLTS248B – JUNE 2005 – REVISED FEBRUARY 2008 Typical Application The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Track compliant modules. Connecting the Track inputs of two or more modules forces their track input to follow the same collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a common Track control signal.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.
PAGE 17
PACKAGE OPTION ADDENDUM www.ti.
PAGE 18
PAGE 19
PAGE 20
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.