Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - hot swap controller -48 V TSSOP 14 Surface-mount

TPS2394

RTN

GAT

SENSE

SOURCE

RAMPFLTTIM

FLT

RAMP

5 6 14 13

LOAD

SENSE

FLT

Power Good

Fault

(1)

NC NC

-Vin

RTN

TPS2394

www.ti.com

SLVSAA9 –AUGUST 2010

–48-V Hot Swap Power Manager

Check for Samples: TPS2394

FEATURES

DESCRIPTION

• Operating Supply Range of –12 V to –80 V

• Withstands Transients to –100 V

The TPS2394 is a hot swap power manager which

can provide inrush limit, over current protection, short

• Programmable Current Limit

circuit protection. The TPS2394 operates with supply

• Programmable Linear Inrush Slew Rate

voltages from −12 V to −80 V, and withstands input

• Programmable UV/OV Thresholds

transient to −100 V.

• Programmable UV and OV Hysteresis

The TPS2394 uses a power FET to provide load

• Fault Timer to Eliminate Nuisance Trips

current slew rate control and peak current limiting that

is programmed by one resistor and one capacitor.

• Power Good and Fault Outputs

The device also provides a power good output to

• 14-Pin TSSOP Package

enable down-stream power converters and a fault

output to indicate load problems.

APPLICATIONS

• –48-V Distributed Power Systems

• Central Office Switching

• ATCA Systems

• Base Stations

TYPICAL APPLICATION DIAGRAM

(1) D1 optional per application requirements.

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.

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)

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TPS2394 www.ti.
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TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com 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. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) (2) PARAMETERS VALUE RTN Input voltage range FLTTIM, RAMP, SENSE, OV, UV Output voltage range FLT, PG Continuous output current FLT, PG –0.
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TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 ELECTRICAL CHARACTERISTICS SOURCE = -48 V, UV = 2.5 V, OV = 0.5 V, SENSE = 0 V, RAMP = 0 V, TA = −40°C to 85°C (unless otherwise noted) (1) (2) PARAMETER TEST CONDITIONS MIN TYP MAX 1000 1500 UNIT INPUT SUPPLY ICC1 Supply current SOURCE = -48 V ICC2 Supply current SOURCE = -80 V VUVLO_I Internal UVLO threshold voltage To GAT pull up VHYST Internal UVLO hysteresis voltage 2000 µA –11.8 –10 –8 V 50 240 500 mV To GAT pull up, 25°C 1.
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TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) SOURCE = -48 V, UV = 2.5 V, OV = 0.5 V, SENSE = 0 V, RAMP = 0 V, TA = −40°C to 85°C (unless otherwise noted)(1)(2) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RAMP GENERATOR ISRC1 RAMP source current, slow turn-on rate RAMP – SOURCE = 0.25 V –800 –550 –300 nA ISRC2 RAMP source current, normal rate RAMP – SOURCE = 1 V and 3 V –11.3 –10 –8.
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TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 DEVICE INFORMATION PIN FUNCTIONS PIN NAME I/O DESCRIPTION NO. FLT 2 O Open-drain, active-low indication that the part is in fault. FLTTIM 5 I/O Connection for user programming of the fault timeout period. GAT 11 O Gate drive for external N-channel MOSFET that ramps load current and disconnects in the event of a fault.
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TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com OV: Over voltage comparator input. This input is typically connected to a voltage divider between RTN and SOURCE to sense the magnitude of the input supply. If OV is less than 1.4 V above SOURCE, and UV is more than 1.4 V above SOURCE, and there is no fault, the linear current amp will be enabled. In the event of a fault, pulling OV high or UV low will reset the fault latch and allow the IC to restart. OV can also be used as an active-low logic enable input.
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TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 TYPICAL CHARACTERISTICS SUPPLY CURRENT vs AMBIENT TEMPERATURE 1500 UNDERVOLTAGE PULL-UP CURRENT vs AMBIENT TEMPERATURE -9.0 V(RTN) = 0 V V(RTN) = 0 V 900 600 -48 V ≤ V(SOURCE) ≤ -20 V VIN(UV) - V(SOURCE) = 25 V -9.4 V(SOURCE) = -80 V V(SOURCE) = -48 V V(SOURCE) = -20 V V(SOURCE) = -12 V 300 IHYS_UV - Source Current - mA ICC - Supply Current - mA 1200 -9.8 -10.2 -10.6 0 -40 -15 10 35 60 TA - Ambient Temperature - °C -11.
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TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) RAMP OUTPUT CURRENT vs AMBIENT TEMPERATURE, NORMAL RATE MODE TIMER CHARGING CURRENT vs AMIBENT TEMPERATURE -8.5 -46 V(RTN) = 0 V V(FLTTIM) - V(SOURCE) = 2 V -80 V ≤ V(SOURCE) ≤ -12 V -80 V ≤ V(SOURCE) ≤ -20 V -9.1 ICHG - Charging Current - mA ISCR2 - RAMP Output Current - mA Average for VOUT(RAMP) - V(SOURCE) = 1V, 3V V(RTN) = 0 V -9.7 -10.3 -48 -52 -54 -10.9 -11.
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TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 FUNCTIONAL BLOCK DIAGRAM RTN 1 UV Input UV Comparator + 3 1.4 V Input OV Comparator OV Disable 4 1.
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TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com APPLICATION INFORMATION RTN CLOAD R1 RLOAD 1 RTN POWER GOOD 12 PG FAULT 2 FLT GAT 11 SENSE 10 TPS2394 3 SOURCE OV FLTTIM R3 RSENSE UV R2 4 Q1 5 CFLT 7 NC 9 NC 8 RAMP NC NC 6 14 13 CRAMP -Vin Figure 9.
PAGE 11
TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 APPLICATION INFORMATION Setting the Sense Resistor Value Due to the current-limiting action of the internal LCA, the maximum allowable load current for an implementation is easily programmed by selecting the appropriate sense resistor value. The LCA acts to limit the sense voltage V(SENSE-SOURCE) to its internal reference. Once the voltage at the RAMP pin exceeds approximately 4 V, this limit is the clamp voltage, VREF_K.
PAGE 12
TPS2394 SLVSAA9 – AUGUST 2010 www.ti.com Due to the three-phase nature of the load current at turn-on, the load voltage ramp has potentially three distinct phases. This profile depends on the relative values of load capacitance, input DC potential, maximum current limit and other factors. The first two phases are characterized by the two different slopes of the current ramp; the third phase, if required to complete load charging, is the constant-current charging at IMAX.
PAGE 13
TPS2394 www.ti.com SLVSAA9 – AUGUST 2010 Continuing this calculation example, using a 220-µF input capacitor (CLOAD), Equation 3 and Equation 4 estimate the load voltage ramping to approximately –45 V during the soft-start period. If the module should operate down to –72-V input supply, approximately another 1.4 ms of constant-current charging may be required. Therefore, Equation 6 and Equation 8 are used to determine CFLT(MIN), and the result is approximately 0.039-µF.
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TPS2394 SLVSAA9 – AUGUST 2010 R3 = www.ti.com 1.4 × R1 × VUV_L (VUV_L - 1.4 ) ´ (VOV_L + 10-5 × R1) (11) Where: VUV_L is the UVLO threshold when the input supply is low; i.e., less than VUV, and VOV_L is the OVLO threshold when the input supply is low; i.e., less than VOV Referring to Figure 10a, Equation 10 and Equation 11 produce R2 = 4.909 kW (4.99 kΩ selected) and R3 = 3.951 kΩ (3.92 kΩ selected), as shown. For the selected values, the expected nominal supply thresholds are VUV_L = 32.
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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 TPS2394PWR Package Package Pins Type Drawing TSSOP PW 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 12.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) 5.6 1.6 8.0 W Pin1 (mm) Quadrant 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) TPS2394PWR TSSOP PW 14 2000 367.0 367.0 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.