Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - hot swap controller Multi-purpose QFN 16 Surface-mount

LTCH GND CTIFLTIMAX

VIN

6 5 7 8 9

TPS2420

UDG-09017

(A)

15-V

SMAJ15A

(A)

VIN

40.2kW 49.9kW 0.1 mF

IMON

VOUT

FLT

63.4kW

}

Optional:

tosystem

monitor

(A)

LOAD

Input Voltage Bus

Output to voltage bus or

DC/DC converter

(A)Requiredonlyinsystemswithleadand/orloadinductance.

VIN

VOUT

3.0Vto20.0V

TPS2420

www.ti.com

SLUS903E –JANUARY 2009–REVISED MAY 2013

3-V to 20-V INTEGRATED FET HOT SWAP CONTROLLER

Check for Samples: TPS2420

FEATURES

DESCRIPTION

The TPS2420 provides highly integrated load

• Integrated 30-mΩ Pass MOSFET

protection for 3-V to 20-V applications. The TPS2420

• 3.0-V to 20-V Bus Operation

protects loads, minimizes inrush current, and safely

• Programmable Fault Current

shuts down in the event of a fault. The programmable

fault current threshold starts the fault timer while

• Programmable Hard Current Limit

allowing the current to pass to the load uninhibited.

• Programmable Fault Timer

The programmable current limit threshold sets the

• Internal MOSFET Power Limiting Foldback

maximum current allowed into the load, for both

inrush and severe load faults. Both events use the

• Latching and Auto-Retry Operation

programmable timer which inhibits all current to the

• Analog Current Monitor Output

load when it expires.

• Powergood Output

The dual protection thresholds are useful in

• Fault Output Indicator

applications such as disk drives. The start-up and

• 4 mm × 4 mm QFN

seek currents are typically higher than the nominal

current and during this time the load needs a low

• –40°C to 125°C Junction Temperature Range

impedance path to deliver the power. If a failure at

• UL Listed - File Number E169910

the load occurs, the current limit does not allow the

current to exceed the programmed threshold. This

APPLICATIONS

protects both the load and the integrity of the power

supply. The internal MOSFET is protected by power

• RAID Arrays

limit circuitry which ensures that the MOSFET

• Telecommunications

remains within its safe operating area (SOA) during

• Plug-In Circuit Boards

all operating states.

• Disk Drives

The TPS2420 also allows the system to monitor load

currents with no need for a shunt in the power path.

The gain of the current monitor can be scaled to the

application. Fault and power good outputs are

provided for improved system management and

sequencing control.

This device can be programmed to either latch-off or

retry in the event of a fault. All of this functionality is

packed into a 16-pin 4 × 4 mm QFN package.

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 (29 pages)

PAGE 1
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 3-V to 20-V INTEGRATED FET HOT SWAP CONTROLLER Check for Samples: TPS2420 FEATURES DESCRIPTION • • • • • • • • • • • • • The TPS2420 provides highly integrated load protection for 3-V to 20-V applications. The TPS2420 protects loads, minimizes inrush current, and safely shuts down in the event of a fault. The programmable fault current threshold starts the fault timer while allowing the current to pass to the load uninhibited.
PAGE 2
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 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.
PAGE 3
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 ELECTRICAL CHARACTERISTICS over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 2.6 2.85 2.9 UNIT INPUT SUPPLY (VIN) VUVLO Undervoltage lockout VIN increasing Hysteresis Bias current 150 V mV V EN = 2.4 V 25 100 μA V EN = 0 V 3.9 5 mA 33 50 5 7.5 0.77 1.0 V A INPUT/OUTPUT RON On-resistance RVIN-VOUT, IVOUT < IIMAX or IVOUT < (ISET × 1.25), 1 A ≤ IVOUT ≤ 4.
PAGE 4
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 0.2 0.4 V 1 μA FAULT (IFLT) VOL Low-level output voltage VCT = 1.8 V, I FLT = 1 mA IIFLT Leakage current V FLT = 18 V POWERGOOD (PG) V PG PG threshold V(VIN-VOUT) decreasing 0.4 0.5 0.65 Hysteresis 0.1 0.25 0.4 0.2 0.
PAGE 5
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 TPS2420 FUNCTIONAL BLOCK DIAGRAM IOUT 1 VIN 2 3 4 V(DS) Detector + S - R R FT LCA + + R IOUT / 66k 13 IMON 1.0V + 11 VOUT 10 10 uA Q Pump Constant Power Engine GND 5 I(D) Detector 12 1.6 x ILIM 15 FLT IMAX 7 + + IOUT ______ 200k 8 PWRG\ + IFLT CT Charge THERMAL SHUTDOWN 34 uA CT 1.35 V 9 S Q R Q FLT + FLT 1.25 uA 33 uA + 200 mV LTCH 6 VIN 10M 1.
PAGE 6
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com DEVICE INFORMATION VIN 1 VIN 2 EN FLT PG IMON PINOUT DIAGRAM 16 15 14 13 12 VOUT 11 VOUT TPS2420 4 9 5 6 7 8 IFLT VIN IMAX 10 VOUT LTCH 3 GND VIN CT TERMINAL FUNCTIONS NAME EN PIN NO. I/O 16 I Device is enabled when this pin is pulled low. I Power in and control supply voltage . If low, the TPS2420 will attempt to restart after an overcurrent fault.
PAGE 7
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 PIN DESCRIPTION CT: Connect a capacitor form CT to GND to set the fault time. The fault timer starts when the fault current threshold is exceeded, charging the capacitor with 36 μA from GND towards an upper threshold of 1.4 V. If the capacitor reaches the upper threshold, the internal pass MOSFET is turned off. The MOSFET will stay off until EN is cycled if a latching version is used.
PAGE 8
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com VIN: Input voltage to the TPS2420. The recommended operating voltage range is 3 V to 18 V. All VIN pins should be connected together and to the power source. VOUT: Output connection for the TPS2420. When switched on the output voltage will be approximately: VOUT = VIN - 0.04 ´ IOUT (5) All VOUT pins should be connected together and to the load. LTCH: When pulled low the 2420 will attempt to restart after a fault.
PAGE 9
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 TYPICAL CHARACTERISTICS CURRENT LIMIT vs JUNCTION TEMPERATURE FAULT CURRENT vs JUNCTION TEMPERATURE 2.20 2.20 RMAX = 100 k 2.15 IFAULT – Fault Current – A IIMAX – Current Limit – A 2.10 2.50 2.00 1.95 1.90 2.10 2.50 2.00 1.95 1.90 1.85 1.85 1.80 –50 0 50 – Junction Temperature – °C TJ 100 1.80 –50 150 TJ 0 50 100 – Junction Temperature – °C Figure 1. Figure 2.
PAGE 10
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) OUTPUT CURRENT vs JUNCTION TEMPERATURE FAULT TIMER THRESHOLD VOLTAGE vs JUNCTION TEMPERATURE –32.0 ILOAD = 2 A VTHRESH – Fault Timer Threshold Voltage -– V –32.2 1.50 IIMON – Output Current – mA –32.4 –32.6 –32.8 –33.0 –33.2 –33.4 –33.6 –33.8 –34.0 –50 0 TJ 50 100 150 1.45 1.40 1.35 1.30 –50 – Junction Temperature – °C Figure 5. 10 0 TJ 50 100 150 – Junction Temperature – °C Figure 6.
PAGE 11
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 TYPICAL CHARACTERISTICS Figure 7. 12-V Startup into 15-Ω, 700-μF Load Figure 8. 12-V Input Addded to an 8-Ω Load Figure 9. Failed Startup into a 4-Ω Load Figure 10. 12-V Soft Overload, 3-A to 4.
PAGE 12
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) 12 Figure 11. Firm Overload, 3-A to 5.4 A, Power Limit Tripped Figure 12. 12-V Hard Overload, 3.6-A Load then Short Figure 13. Power Dissipation During 12-V Startup into a 60Ω, 800-μF Load Figure 14.
PAGE 13
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 TYPICAL CHARACTERISTICS (continued) Figure 15. Startup into a 1-Ω Load Figure 16. Firm Overload, Load Stepped From 3.8 A to 5.5 A Figure 17. Hard Overload, Load Stepped from 3.8 A to 7.
PAGE 14
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION If EN is tied to GND at startup and VIN does not ramp quickly the TPS2420 may momentarily turn off then on during startup. This can happen if a capacitive load momentarily pulls down the input voltage below the UV threshold. If necessary, this can be avoided by delaying EN assertion until VIN is fully up. Maximum Load The power limiting function of the TPS2420 provides very effective protection for the internal FET.
PAGE 15
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 APPLICATION INFORMATION Operation When load current exceeds the user programmed fault limit (IFAULT) during normal operation the fault timer starts. If load current drops below the IFAULT threshold before the fault timer expires, normal operation continues. If load current stays above the IFAULT threshold the fault timer expires and a fault is declared.
PAGE 16
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com Start Up Into a Short The controller attempts to power on into a short for the duration of the timer. Figure 20 shows a small current resulting from power limiting the internal MOSFET. This happens only once for the latch off mode. For the retry mode, Figure 24 shows this cycle repeating at an interval based on the CT time. Shutdown Modes Hard Overload - Fast Trip When a hard overload causes the load current to exceed 1.
PAGE 17
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 Because IFAULT satisfies the spin up current, the timer can be set for the additional loading of charging the capacitor. Estimate approximately 20 ms. Use either Equation 12 or Table 2 to estimate the capacitance. CCT = TFAULT 38.9 ´ 103 = 20 ´ 10-3 ´ 103 = 0.514 ´ 10-6 38.9 (12) For a scaled analog readback of the current from VIN, set the IMON resistor. In Equation 13 , the VAD_INMAX is the desired full scale A/D converter voltage.
PAGE 18
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 www.ti.com APPLICATION PLOTS 18 Figure 18. Start Up Into an RC Load (PG) Figure 19. Start Up Into an RC Load (CT) Figure 20. Startup Into a Short Circuit Output Figure 21.
PAGE 19
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 Figure 22. FLT on Device Output Short Figure 23. Overcurrent Shutdown Figure 24.
PAGE 20
TPS2420 SLUS903E – JANUARY 2009 – REVISED MAY 2013 12 V VIN www.ti.com 1 VIN EN 16 2 VIN FLT 15 3 VIN PG 14 4 VIN 5 GND VOUT 12 6 LTCH VOUT 11 7 IMAX R1 10 kW C1 1 mF 15 V D1 SMAJ15A RIMAX 57.6 kW R2 10 kW IMON 13 U1 TPS2420RSA 12 V VOUT RIMON 63.4 kW VOUT 10 PowerPAD 8 CT IFLT 9 RIFLT 80.6 kW D2 MBR130LSFT1 CT 560 nF GND GND UDG-09018 Figure 25. TPS2420 Reference Design, 12-V, 2.
PAGE 21
TPS2420 www.ti.com SLUS903E – JANUARY 2009 – REVISED MAY 2013 REVISION HISTORY Changes from Revision A (March, 2010) to Revision B Page • Changed PRODUCT INFORMATION Note 1 to: "For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the device product folder on www.ti.com." ..................... 2 • Changed Table 2 - TSD (ms) column values .............................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS2420RSAR QFN RSA 16 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS2420RSAR QFN RSA 16 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS2420RSAT QFN RSA 16 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
PAGE 24
PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS2420RSAR QFN RSA 16 3000 367.0 367.0 35.0 TPS2420RSAR QFN RSA 16 3000 367.0 367.0 35.0 TPS2420RSAT QFN RSA 16 250 210.0 185.0 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 JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.