Datasheet

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OUT

GND

FAULT

ILIM

FAULT

100 kΩ

Control Signal

2.5V – 6.5V

VOUT

TPS2556/57

0.1 uF

LOAD

Fault Signal

Power Pad

EN = Active Low for the TPS2556

EN = Active High for the TPS2557

OUT

FAULT

ILIM

GND

PAD

OUT

TPS2556/57

DRB PACKAGE

(TOP VIEW)

TPS2556

TPS2557

www.ti.com

SLVS931A – NOVEMBER 2009–REVISED FEBRUARY 2012

PRECISION ADJUSTABLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

Check for Samples: TPS2556, TPS2557

FEATURES

APPLICATIONS

• Meets USB Current-Limiting Requirements

• USB Ports/Hubs

• Adjustable Current Limit, 500 mA–5 A (typ) • Digital TV

• +/- 6.5% Current-Limit Accuracy at 4.5 A • Set-Top Boxes

• Fast Overcurrent Response - 3.5-μS (typ) • VOIP Phones

• 22-mΩ High-Side MOSFET

DESCRIPTION

• Operating Range: 2.5 V to 6.5 V

The TPS2556/57 power-distribution switches are

• 2-μA Maximum Standby Supply Current

intended for applications where precision current

• Built-in Soft-Start

limiting is required or heavy capacitive loads and

short circuits are encountered. These devices offer a

• 15 kV / 8 kV System-Level ESD Capable

programmable current-limit threshold between 500

• UL Listed* – File No. E169910

mA and 5.0 A (typ) via an external resistor. The

• CB & Nemko Certification*

power-switch rise and fall times are controlled to

minimize current surges during turn on/off.

• *R

ILIM

≥ 24.9 kΩ (5A maximum)

TPS2556/57 devices limit the output current to a safe

level by switching into a constant-current mode when

the output load exceeds the current-limit threshold.

The FAULT logic output asserts low during

overcurrent and over temperature conditions.

Figure 1. Typical Application as USB Power Switch

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.

2PowerPAD is a trademark 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 (23 pages)

PAGE 1
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com PRECISION ADJUSTABLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES Check for Samples: TPS2556, TPS2557 FEATURES APPLICATIONS • • • • • • • • • • • • • • • • 1 2 Meets USB Current-Limiting Requirements Adjustable Current Limit, 500 mA–5 A (typ) +/- 6.5% Current-Limit Accuracy at 4.5 A Fast Overcurrent Response - 3.5-μS (typ) 22-mΩ High-Side MOSFET Operating Range: 2.5 V to 6.
PAGE 2
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 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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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS VIN MIN MAX 2.5 6.5 TPS2556 0 6.5 TPS2557 0 6.5 Input voltage, IN VEN Enable voltage VEN VIH High-level input voltage on EN or EN VIL Low-level input voltage on EN or EN IOUT Continuous output current, OUT UNIT V V 1.1 V 0.
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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over recommended operating conditions, V/EN = 0 V, or VEN = VIN (unless otherwise noted) TEST CONDITIONS (1) PARAMETER MIN TYP MAX UNIT SUPPLY CURRENT IIN_off Supply current, low-level output 0.1 2.0 μA RILIM = 24.9 kΩ 95 120 μA RILIM = 100 kΩ 85 110 μA 0.01 1 μA 2.35 2.45 VIN = 6.5 V, No load on OUT, V EN = 6.
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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com DEVICE INFORMATION Pin Functions PIN NAME I/O DESCRIPTION TPS2556 TPS2557 EN 4 – I Enable input, logic low turns on power switch EN – 4 I Enable input, logic high turns on power switch GND 1 1 2, 3 2, 3 I Input voltage; connect a 0.1 μF or greater ceramic capacitor from IN to GND as close to the IC as possible. 8 8 O Active-low open-drain output, asserted during overcurrent or overtemperature conditions.
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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com PARAMETER MEASUREMENT INFORMATION (continued) IOS IOUT tIOS Figure 3. Response Time to Short Circuit Waveform Decreasing Load Resistance VOUT Decreasing Load Resistance IOUT IOS Figure 4. Output Voltage vs. Current-Limit Threshold TPS2556 VIN = 5 V RFAULT 100 kW Fault Signal Enable Signal 0.1 uF IN IN OUT OUT FAULT EN VOUT RLOAD 150 µF ILIM GND 24.9 kW Power Pad Figure 5.
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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS VOUT 2 V/div VOUT 2 V/div VEN_bar 5 V/div VEN_bar 5 V/div IIN 2 A/div IIN 2 A/div t - Time - 2 ms/div t - Time - 2 ms/div Figure 6. Turn-on Delay and Rise Time Figure 7. Turn-off Delay and Fall Time VEN_bar 5 V/div VOUT 2 V/div FAULT_bar FAULT_bar 5 V/div 5 V/div IIN 2 A/div IIN 5 A/div t - Time - 2 ms/div t - Time - 5 ms/div Figure 8. Device Enabled into Short-Circuit Figure 9.
PAGE 8
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) 120 700 VIN = 6.5 V IIN - Supply Current, Output Enabled - mA IIN - Supply Current, Output Disabled - nA VIN = 5 V 600 500 400 VIN = 6.5 V 300 200 VIN = 2.5 V 100 0 -100 -50 0 50 TJ - Junction Temperature - °C 100 100 80 VIN = 2.5 V 40 RILIM = 24.9 kΩ 20 0 -50 150 Figure 12. IIN – Supply Current, Output Disabled – nA 0 50 TJ - Junction Temperature - °C 100 150 Figure 13.
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TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) 5.0 4.5 IDS - Static Drain-Source Current - A 4.0 TJ = -40°C 3.5 3.0 TJ = 25°C 2.5 2.0 1.5 TJ = 125°C 1.0 RILIM = 24.9kΩ 0.5 0 0 20 40 60 100 80 VIN-VOUT - mV 120 140 160 Figure 18. Switch Current vs.
PAGE 10
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com FAULT RESPONSE The FAULT open-drain output is asserted (active low) during an overcurrent or overtemperature condition. The TPS2556/57 asserts the FAULT signal until the fault condition is removed and the device resumes normal operation. The TPS2556/57 is designed to eliminate false FAULTreporting by using an internal delay "deglitch" circuit for overcurrent (9-ms typ) conditions without the need for external circuitry.
PAGE 11
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com PROGRAMMING THE CURRENT-LIMIT THRESHOLD The overcurrent threshold is user programmable via an external resistor. The TPS2556/57 uses an internal regulation loop to provide a regulated voltage on the ILIM pin. The current-limit threshold is proportional to the current sourced out of ILIM. The recommended 1% resistor range for RILIM is 20 kΩ ≤ RILIM ≤ 187 kΩ to ensure stability of the internal regulation loop.
PAGE 12
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com RILIM (kW ) = 33.2kW IOSmax (mA) = IOSmax (mA) = 99038V RILIM0.947kW 99038V 33.20.947kW IOSmax (mA) = 3592mA (3) The resulting maximum current-limit threshold is 3592 mA with a 33.2 kΩ resistor. APPLICATION 2: DESIGNING BELOW A MAXIMUM CURRENT LIMIT Some applications require that current limiting must occur below a certain threshold.
PAGE 13
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com Table 1. Common RILIM Resistor Selections (continued) 1750 63.1 63.4 62.8 64.0 1489 1742 1965 2000 55.2 54.9 54.4 55.4 1737 2012 2252 2250 49.1 48.7 48.2 49.2 1975 2269 2523 2500 44.2 44.2 43.8 44.6 2191 2501 2765 2750 40.2 40.2 39.8 40.6 2425 2750 3025 3000 36.9 36.5 36.1 36.9 2689 3030 3315 3250 34.0 34.0 33.7 34.3 2901 3253 3545 3500 31.6 31.6 31.3 31.
PAGE 14
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com AUTO-RETRY FUNCTIONALITY Some applications require that an overcurrent condition disables the part momentarily during a fault condition and re-enables after a pre-set time. This auto-retry functionality can be implemented with an external resistor and capacitor. During a fault condition, FAULTpulls low EN.
PAGE 15
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com TPS2556/57 Input 0.1 uF IN RFAULT 100 kΩ FAULT EN Fault Signal Control Signal Output OUT ILIM CLOAD R1 187 kΩ R LOAD R2 22.1 kΩ GND Power Pad Q1 Current Limit Control Signal Figure 22.
PAGE 16
TPS2556 TPS2557 SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012 www.ti.com REVISION HISTORY Changes from Original (November 2009) to Revision A Page • Changed VEN to VEN in RECOMMENDED OPERATING CONDITIONS .............................................................................. 3 • Changed VEN to VEN in RECOMMENDED OPERATING CONDITIONS ..............................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TPS2556DRBR SON DRB 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS2556DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS2557DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS2556DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS2556DRBT SON DRB 8 250 210.0 185.0 35.0 TPS2557DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS2557DRBT SON DRB 8 250 210.0 185.0 35.
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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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.