Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - ELCs High side VFDFN 10

PAD

GND

IN 9

OUT

ILIM0

10 FAULT

TPS2554/TPS2555

DRC PACKAGE

(TOP VIEW)

ILIM_SEL

IN OUT

ILIM1

EN/EN

8/9

2/3

FAULT

EN/EN

OUT

ILIM_SEL

ILIM0

Power

PAD

GND

ILIM1

TPS2554/55

100 nF

FAULT

4.5 V to 5.5 V

FAULT Signal

Power Switch

Enable

Current Limit

Select

2x R

ILIMx

120 mF

VBUS

TPS2554

TPS2555

www.ti.com

SLVSAM0 –JUNE 2011

Precision Adjustable Current-Limited, Power-Distribution Switches

Check for Samples: TPS2554, TPS2555

FEATURES

APPLICATIONS

• Meets USB Current-Limiting Requirements

• USB Ports/Hubs

• Adjustable Current Limit, 500 mA to 2.5 A (typ) • Digital TV

• Two Independently-Settable, Current-Limit • Set-Top Boxes

Thresholds

• VOIP Phones

• Fast Overcurrent Response - 1.5 μs (typ)

DESCRIPTION

• 73-mΩ High-Side MOSFET

The TPS2554/55 power-distribution switches are

• 3.8-μA Maximum Standby Supply Current

intended for applications where precision current

• PowerPAD™ Thermal Management

limiting is required or heavy capacitive loads and

• Automatic Output Discharge when Disabled

short circuits are encountered. These devices offer a

• Both High-Enable (TPS2554) and Low-Enable

programmable current-limit threshold between 500

(TPS2555) Versions Available

mA and 2.5 A (typ) via an external resistor.

TPS2554/55 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.

TPS2554/55 DRC Package and Typical Application Diagram

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
TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com Precision Adjustable Current-Limited, Power-Distribution Switches Check for Samples: TPS2554, TPS2555 FEATURES APPLICATIONS • • • • • • • 1 2 • • • • • • Meets USB Current-Limiting Requirements Adjustable Current Limit, 500 mA to 2.5 A (typ) Two Independently-Settable, Current-Limit Thresholds Fast Overcurrent Response - 1.5 μs (typ) 73-mΩ High-Side MOSFET 3.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 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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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com THERMAL INFORMATION TPS2554/TPS2555 THERMAL METRIC (1) DRC UNITS 14 PINS Junction-to-ambient thermal resistance (2) θJA (3) 45.9 θJCtop Junction-to-case (top) thermal resistance θJB Junction-to-board thermal resistance (4) 21.4 ψJT Junction-to-top characterization parameter (5) 1.0 ψJB Junction-to-board characterization parameter (6) 21.6 θJCbot Junction-to-case (bottom) thermal resistance (7) 5.9 (1) (2) (3) (4) (5) (6) (7) 53.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com ELECTRICAL CHARACTERISTICS Conditions are -40°C ≤ TJ ≤ 125°C unless otherwise noted VEN (if TPS2554) = VIN = 5 V, VEN (if TPS2555) = 0 V, RFAULT = 10 kΩ, RILIM0 = 210 kΩ, RILIM1 = 20 kΩ, ILIM_SEL = 0 V unless otherwise noted. Positive currents are into pins. Typical values are at 25 °C. All voltages are with respect to GND unless otherwise noted.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com Parameter Measurement Information OUT CL RL tr VOUT tf 90% 90% 10% 10% TEST CIRCUIT VEN 50% 50% VEN ton toff 50% 50% toff ton 90% 90% VOUT VOUT 10% 10% VOLTAGE WAVEFORMS Figure 1. Test Circuit and Voltage Waveforms VOUT IOS Increasing Load Current IOUT UDG-10118 tIOS IOUT IOS Figure 2. Response Time to Short-Circuit Waveform Figure 3.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com DEVICE INFORMATION Pin Functions PIN DESCRIPTION TPS2554 EN 5 - I Enable input, logic high turns on power switch (TPS2554). EN - 5 I Enable input, logic low turns on power switch (TPS2555). GND 1 1 2, 3 2, 3 I Input voltage; connect a 100-nF, or greater, ceramic capacitor from IN to GND as close to the device as possible. 10 19 O Active-low, open-drain output, asserted during overcurrent or over-temperature conditions.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS In UVLO Rising vs Temperature Supply Current - Disabled vs Temperature 4.5 1 4.4 0.9 0.8 ICCL - IN Current - mA VUVLO - IN UVLO - V 4.3 4.2 4.1 4 3.9 0.7 0.6 0.5 0.4 0.3 3.8 0.2 3.7 0.1 3.6 0 -40 -20 0 20 40 60 80 100 120 140 -40 -20 0 TJ - Junction Temperature - °C 20 40 60 80 100 120 140 TJ - Junction Temperature - °C Figure 4. Figure 5.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) Current Limit vs Temperature Power Switch On-Resistance vs Temperature 2500 100 ISHORT - Current Limit - mA 2000 RDS(on) - IN/OUT ON Resistance - mW 95 RILIM = 20 kW 1500 RILIM = 100 kW 1000 RILIM = 210 kW 500 90 85 80 75 70 65 60 55 0 50 -40 -20 0 20 40 60 80 100 120 140 -40 -20 TJ - Junction Temperature - °C 0 20 40 80 Figure 8. Figure 9.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) EN Threshold Falling vs Temperature Response to a Short Circuit (following assertion of enable) 2 7.0 1.8 6.0 3.0 Enable (TPS2554) 1.6 5.0 1.2 1 2.0 4.0 Input Current 3.0 Current (A) 1.4 Voltage (V) VEN - EN Falling Threshold - V 3.5 CIN= 100 nF; COUT = 150 µF; RILIM = 20 kΩ 0.8 1.0 2.0 0.6 Output Voltage 1.0 0.4 0.0 0.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) Response to a Short Circuit (from a no-load condition) 20.0 Response to a Short Circuit (from a no-load condition) VIN = 5 V; Source capacitance = 470 µF Al + 3x68 µF Ta; CIN= 100 nF; COUT = 150 µF; RILIM = 20 kΩ 10.0 16.0 20.0 VIN = 5 V; Source capacitance = 470 µF Al + 3x68 µF Ta; CIN= 100 nF; COUT = 150 µF; RILIM = 20 kΩ 15.0 14.0 Voltage (V) 0.0 Current (A) Voltage (V) Input Current 10.0 12.0 10.0 10.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com DETAILED DESCRIPTION Overview The TPS2554/55 is a current-limited, power-distribution switch using an internal N-channel MOSFET as a switch for applications where short circuits or heavy-capacitive loads will be encountered. This device allows the user to program two independent current-limit thresholds between 500 mA and 2.5 A (typ) via two external resistors. The ILIM_SEL pin allows the user to select one current limit or the other.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com FAULT Response The FAULT open-drain output is asserted low during an overcurrent or over-temperature condition. The TPS2554/55 asserts the FAULT signal until the fault condition is removed and the device resumes normal operation. The TPS2554/55 is designed to eliminate false FAULT reporting by using an internal delay "deglitch" circuit for overcurrent conditions (9 ms typical) without the need for external circuitry.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com APPLICATION INFORMATION Input and Output Capacitance Capacitance added to the input and output of the TPS2554/55 improves the performance of the device; the actual capacitance should be optimized for the particular application. For all applications, a 100 nF or greater ceramic bypass capacitor between IN and GND is recommended as close to the device as possible for local noise decoupling.
PAGE 14
TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com Current-Limit Threshold vs Current-Limit Resistance 3250 3000 2750 ISHORT - Current Limit - mA 2500 2250 2000 1750 1500 ISHORT_max 1250 1000 750 500 ISHORT_min 250 0 0 20 60 40 80 100 120 140 160 180 200 220 RILIM - Current Limit Resistance - kW Figure 18.
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TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com Current Limit Setpoint Example In the following example, choose the ILIM resistor to ensure that the TPS2554/55 does not trip off under worst-case conditions of ILIM and resistor tolerance (assume 1% initial-plus-temperature resistor tolerance). For this example IOSMIN = 2500 mA. IOSMIN = 48000 = 2500mA R1.037 ILIMx é 48000 ù RILIMx = ê ú ë IOSMIN û 1 1.037 (5) é 48000 ù =ê ú ë 2500mA û 1 1.037 = 17.
PAGE 16
TPS2554 TPS2555 SLVSAM0 – JUNE 2011 www.ti.com Power Dissipation and Junction Temperature The low on resistance of the N-channel MOSFET allows small surface-mount packages to pass large currents. It is good design practice to estimate power dissipation and junction temperature. The below analysis gives an approximation for calculating junction temperature based on the power dissipation in the package.
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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 TPS2554DRCR SON DRC 10 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 TPS2554DRCT SON DRC 10 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS2555DRCR SON DRC 10 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) TPS2554DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS2554DRCT SON DRC 10 250 210.0 185.0 35.0 TPS2555DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS2555DRCT SON DRC 10 250 210.0 185.0 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.