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TPS22946

www.ti.com

SLVS984A –SEPTEMBER 2009–REVISED FEBRUARY 2010

ULTRA-LOW POWER, LOW INPUT VOLTAGE, CURRENT-LIMITED LOAD SWITCH

WITH SHUT-OFF, AUTO-RESTART, AND OVER-CURRENT CONDITION TIME-OUT

Check for Samples: TPS22946

FEATURES

DESCRIPTION

• Ultra-Low Quiescent Current 1 mA (typ)

at V

= 1.8 V

The TPS22946 is an ultra-low power load switch that

provides protection to systems and loads in

• Input Voltage Range: 1.62 V to 5.5 V

high-current conditions. The device contains a

• Low ON-Resistance

300-mΩ current-limited P-channel MOSFET that can

– r

= 300 mΩ at V

= 5.5 V

operate over an input voltage range of 1.62 V to

– r

= 400 mΩ at V

= 3.3 V 5.5 V. The switch is controlled by an on/off input

(ON), which is capable of interfacing directly with

– r

= 500 mΩ at V

= 2.5 V

low-voltage control signals. The TPS22946 includes

– r

= 600 mΩ at V

= 1.8 V

thermal shutdown protection that prevents damage to

• Selectable Minimum Current Limit:

the device when a continuous over-current condition

causes excessive heating by turning off the switch.

155 mA, 70 mA, or 30 mA

• Integrated Inrush Current Timeout (8 ms)

When the switch current reaches the maximum limit,

the TPS22946 operates in a constant-current mode to

• Shutdown Current: < 1 mA

prohibit excessive currents from causing damage.

• Thermal Shutdown

The current limit can be selected using the CL input:

• Fault Blanking

a high CL input sets the current limit to 155 mA, a low

CL input sets the current limit to 70 mA, and a

• Auto Restart

floating CL input sets the current limit to 30 mA.

• Over-Current Condition Timeout (Automatic

Disable for Permanent Over-Current)

If the constant current condition still persists after 10

ms, the switch is turned off and the fault signal pin

• 1.8-V Compatible Control Input

(OC) is pulled low. The TPS22946 has an

• ESD Performance Tested Per JESD 22

auto-restart feature which turns the switch on again

– 6000-V Human-Body Model

after 70 ms if the ON pin is still active. If the

(A114-B, Class II)

TPS22946 remains in an over-current condition for 5

seconds, the device shuts off until it is turned back on

• Tiny WCSP Package 1.4mm x 0.9 mm (YZP)

by setting the ON control signal off and then on

again.

APPLICATIONS

If the device is used to protect an LDO, the inrush

• Fingerprint Module Protection

current required by the LDO at startup can, in some

• Portable Consumer Electronics

cases, exceed the current limit and initiate a blanking

• Mobile Phones

(current limiting) condition. TPS22946 provides

• Smartphone

allowance for this scenario during startup of the LDO

• Notebooks

by temporarily increasing the current limit to 435-mA

for 8-ms after the load switch is enabled.

• GPS Devices

The TPS22946 is available in space-saving

6-terminal WCSP (YZP) package. It is characterized

for operation over the free-air temperature range of

–40°C to 85°C.

Table 1. FEATURE LIST

INTEGRATED CURRENT

AUTO- OVER-

(TYP) AT INRUSH LIMIT

CURRENT LIMIT RESTART CURRENT ENABLE

5.5 V CURRENT BLANKING

TIME TIMEOUT

TIMEOUT TIME

TPS22946 300 mΩ 30 mA, 70 mA, or 155 mA Yes 10 ms 70 ms 6 s Active high

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 (29 pages)

PAGE 1
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 ULTRA-LOW POWER, LOW INPUT VOLTAGE, CURRENT-LIMITED LOAD SWITCH WITH SHUT-OFF, AUTO-RESTART, AND OVER-CURRENT CONDITION TIME-OUT Check for Samples: TPS22946 FEATURES 1 • • • • • • • • • • DESCRIPTION Ultra-Low Quiescent Current 1 mA (typ) at VIN = 1.8 V Input Voltage Range: 1.62 V to 5.5 V Low ON-Resistance – rON = 300 mΩ at VIN = 5.5 V – rON = 400 mΩ at VIN = 3.3 V – rON = 500 mΩ at VIN = 2.5 V – rON = 600 mΩ at VIN = 1.
PAGE 2
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com ORDERING INFORMATION (1) PACKAGE (2) TA –40°C to 85°C (1) (2) (3) ORDERABLE PART NUMBER WCSP – YZP (0.5-mm pitch) Reel of 3000 TPS22946YZPR TOP-SIDE MARKING (3) __5H_ For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 Functional Block Diagram A2 VIN B2 CL ON HardShort Detection C2 Control Logic Current Limit A1 VOUT Thermal Shutdown Oscillator C1 OC B1 GND Table 2.
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TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com VIN = L Reset VIN = H ON = L (default) Yes Inrush current solution for 8 ms ON: L ® H No No ON = H Yes Moderate over-current detection every 63.5 ms for 0.5 ms (See moderate over-current flow for details) Over-temperature detection every 7.5 ms for 0.5 ms (See over-temperature detection flow for details) Hard-short detection every 0.125 ms for 0.125 ms (See hard-short flow for details) Figure 1.
PAGE 5
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 - Common to all the detection schemes VIN = L - Common to OC and HS mode only Reset If at any time ON: H → L, then switch returns to this state D VIN = H ON = L (Default) C ON = H No Yes Switch = Open OC signal = L Switch = Closed Switch = Closed Wait for 63.5mS AutoRestart = Wait for 70 ms Yes ON: L → H No ON = H Moderate OC detect No ON = 0.
PAGE 6
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com - Common to all the detection schemes VIN = L - Common to OC and HS mode only Reset VIN = H ON = L (Default) D If at any time ON: H → L, then switch returns to this state C No ON = H Yes Switch = Closed A Yes ON = Edge No OTD ON = 0.5 ms Switch = Closed Wait for 7.
PAGE 7
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 - Common to all the detection schemes VIN = L - Common to OC and HS mode only Reset VIN = H ON = L (Default) If at any time ON: H → L, then switch returns to this state D C No ON = H Yes Switch = Open OC signal = L Switch = Closed Switch = Closed Wait for 0.125mS A AutoRestart = Wait for 70 mS Yes ON = Edge No ON = H Hard Short detect ON No = 0.
PAGE 8
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) VI Input voltage TJ Operating junction temperature range VIN, VOUT, ON, CL Tstg Storage temperature range ESD Electrostatic discharge protection –0.
PAGE 9
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 ELECTRICAL CHARACTERISTICS VIN = 1.62 V to 5.5 V, TYP values at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS IOUT = 0 mA, VIN = 4.5 V to 5.5 V IIN Average quiescent current TA (1) MIN Full range IOUT = 0 mA, VIN = 3.0 V to 3.6 V IOUT = 0 mA, VIN = 1.62 V to 1.
PAGE 10
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com SWITCHING CHARACTERISTICS VIN = 1.8 V, RL = 50 Ω, CL = 1 mF, TA = –40°C to 85°C, TYP values at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT tPWRON Power-ON time RL = 50 Ω, CL = 1 mF 192 ms tPWROFF Power-OFF time RL = 50 Ω, CL = 1 mF 0.
PAGE 11
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 PARAMETER MEASUREMENT INFORMATION VIN ON VOUT (A) TPS22946 RL CL + – OFF CIN =1 µF GND GND GND TEST CIRCUIT 1.8 V VON VON VON/2 VON/2 tr 0V tON tOFF 90% VOUT VOH VOUT tf 0V VOUT/2 VOUT/2 10% 90% 10% VOL tON/tOFF WAVEFORMS Figure 5. Test Circuit and tON/tOFF Waveforms VIN VIN VIN/2 VIN/2 0V 0V tPWRON tPWROFF VOL VOUT VOUT/2 VOUT/2 VOH VON Figure 6.
PAGE 12
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com TYPICAL CHARACTERISTICS ON RESISTANCE vs INPUT VOLTAGE ON RESISTANCE vs TEMPERATURE 0.8 0.8 0.7 0.7 V IN = 1.8 V TA = 85°C 0.6 ON Resistance (Ohm) ON Resistance (Ohm) 0.6 TA = 25°C 0.5 0.4 TA = -40°C 0.3 0.5 V IN = 3.3 V 0.4 0.3 V IN = 5.5 V 0.2 0.2 0.1 0.1 0 0 -40.00 1.62 1.8 2.5 3.3 5.5 25.00 85.00 Tem perature (°C) V IN Figure 7. Figure 8.
PAGE 13
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS (continued) INPUT CURRENT (OFF) vs TEMPERATURE CURRENT LIMIT vs TEMPERATURE 450 200 400 180 V IN = 5.5 V 160 350 140 300 120 ILIM (mA) IIN (Off) (nA) CL = High 250 200 100 CL = Low 80 150 60 V IN = 3.3 V CL = Float 100 40 50 20 V IN = 1.8 V 0 -40.00 25.00 0 -50 85.00 -25 Tem perature (°C) 0 25 50 75 100 75 100 Tem perature (°C) Figure 11. Figure 12.
PAGE 14
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) tReset vs TEMPERATURE tPWRON vs TEMPERATURE 250 80 78 200 76 t PWRON (µs) t Restart (ms) V IN = 5.5 V 74 V IN = 3.3 V V IN = 1.8 V 72 150 100 70 50 68 66 -50 0 -25 0 25 50 75 -40 100 25 85 Tem perature (°C) Tem perature (°C) Figure 15. Figure 16. tPWROFF vs TEMPERATURE ON THRESHOLD 6 1 V IN = 5.5 V 0.9 5 0.8 4 V IN = 3.3 V V OUT (V) t PWROFF (µs) 0.7 0.
PAGE 15
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 APPLICATION INFORMATION On/Off Control The ON pin controls the state of the switch. Activating ON continuously holds the switch in the on state so long as there is no fault. A junction temperature in excess of 150°C overrides the ON control to turn off the switch. ON is active HIGH and has a low threshold making it capable of interfacing with low voltage signals.
PAGE 16
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com Hard-Short Detection The hard short detection circuit is active every 250 ms for a period of 125 ms A comparator monitors the output voltage, VOUT. A hard short is detected when VOUT is lower than 2/3 VIN. The switch then goes into current-limiting mode.
PAGE 17
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 Moderate Over-Current Detection The moderate over-current detection circuit is active every 64 ms for a period of 0.5 ms. A moderate over-current condition is triggered when the output current of the switch exceeds the current limit value and is not yet into hard short condition. The switch then goes into current-limiting mode.
PAGE 18
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com Current Limiting Mode When an over-current condition (moderate or a hard short) is detected, the TPS22946 operates in a constant-current mode to prohibit excessive currents from causing damage. TPS22946 has a current limit of 30 mA, 70 mA or 155 mA. If the constant current condition still persists after 10ms, the device shuts off the switch and pulls the fault signal pin (OC) low.
PAGE 19
TPS22946 www.ti.
PAGE 20
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com Automatic Disable in Case of Permanent Over Current When the switch enters the current-limiting mode due to a hard short condition or a moderate over-current condition, TPS22946 goes through the 10-ms blanking state and the 70-ms auto restart state. If the hard-short condition or the moderate over-current condition persists after 5 s, the part shuts off regardless of the ON signal.
PAGE 21
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 VIN VIN/2 VON is tied directly to VIN 0V VON tPWRON 0V LDO Output stable Allotted time for LDO Inrush Current to exceed normal current limit threshold VOUT Temporarily increase current limit threshold to allow for LDO Inrush current Current Limit as set by CL (30 mA, 70 mA, 155 mA) ILIMIT_INRUSH tPWRON Current Limit Threshold 8 ms Allotted time for CL state to be detected.
PAGE 22
TPS22946 SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 www.ti.com CL Control Pin The TPS22946 supports three current limits: 30 mA, 70 mA, and 155 mA. The current limit selection is determined by the status of the digital input CL pin, as shown in Table 3. A high impedance, or floating, condition allows the CL pin to support a third state. The TPS22946 monitors the state of the CL pin during start-up from a disabled state, and upon start-up sets the current limit accordingly.
PAGE 23
TPS22946 www.ti.com SLVS984A – SEPTEMBER 2009 – REVISED FEBRUARY 2010 Over Temperature Protection An over temperature condition occurs when the temperature of the part is greater than 140°C. The OC flag will go low to indicate a fault. If the over temperature condition persists for more than 6 seconds, the part times out and shuts OFF. The part has to be enabled by either toggling the ON pin or the VIN pin. If the temperature reduces below 130°C within 5 seconds, the part will start normal operation.
PAGE 24
PACKAGE OPTION ADDENDUM www.ti.com 17-May-2014 PACKAGING INFORMATION Orderable Device Status (1) TPS22946YZPR ACTIVE Package Type Package Pins Package Drawing Qty DSBGA YZP 6 3000 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM Op Temp (°C) Device Marking (4/5) -40 to 85 (5H ~ 5H2) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
PAGE 25
PACKAGE OPTION ADDENDUM www.ti.
PAGE 26
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS22946YZPR Package Package Pins Type Drawing SPQ DSBGA 3000 YZP 6 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 180.0 8.4 Pack Materials-Page 1 1.02 B0 (mm) K0 (mm) P1 (mm) 1.52 0.63 4.0 W Pin1 (mm) Quadrant 8.
PAGE 27
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS22946YZPR DSBGA YZP 6 3000 220.0 220.0 34.
PAGE 28
D: Max = 1.418 mm, Min =1.358 mm E: Max = 0.918 mm, Min =0.
PAGE 29
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.