Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - ELCs High side or low side VFDFN 10

S0380-02

2.2 Hm

1.8-V to

5.25-V Input

10 Fm

ILIM

GND

ILIM

PGND

POWER PAD

USB

FAULT

ENUSB

AUX

FAULT

120 Fm

(1)

5 V USB Power

22 Fm

Data

TPS2500

5 V Auxiliary Load

Power, 100 mA

(2)

USB FAULT Flag

5 V USB

Port #1

500 mA

5 V USB

Port #2

500 mA

TYPICAL APPLICATION CIRCUIT

(AUX) − Output Auxiliary Current − mA

0.77

0.79

0.81

0.83

0.85

0.87

0.89

0.91

0.93

0.95

0.97

0 300 600 900 1200 1500

Boost Efficiency − %

G001

= 1.8 V

= 4.5 V

= 3.3 V

TPS2500, TPS2501

www.ti.com

SLVS886C –OCTOBER 2008–REVISED AUGUST 2010

INTEGRATED USB POWER SWITCH WITH BOOST CONVERTER

Check for Samples: TPS2500, TPS2501

FEATURES

APPLICATIONS

• Portable Applications Using Single Li+ Cell

• Integrated Synchronous Boost Converter and

USB Current-Limit Power Switch

• USB Hosts Without Native 5-V Supplies

• Light-Load, High-Efficiency Eco-mode™

DESCRIPTION

Control Scheme (TPS2500) or Constant

Frequency (TPS2501)

The TPS2500 and TPS2501 provide an integrated

solution to meet USB 5-V power requirements from a

• 1.8-V to 5.25-V Input Voltage (2.2-V Minimum

1.8-V to 5.25-V input supply. The features include a

Start-Up Voltage)

Hi-Speed USB compliant power output, output switch

• Adjustable USB Current Limit

enable, current limit, and overcurrent fault reporting.

– 130 mA to 1400 mA (Typical)

The 1.8-V to 5.25-V input can be supplied by sources

• Accurate 20% Current Limit at 1.4-A Setting

including dc/dc regulated supplies (e.g., 3.3 V), or

• Powers up to Two Standard USB Ports

batteries such as single-cell Li+ or three-cell NiCd,

NiMH, or alkaline.

• Auxiliary 5.1-V Output

• Fast Overcurrent-Response Time – 5 ms

The USB power-switch current limit is programmable

Typical

via an external resistor from as low as 130 mA to as

high as 1400 mA (typical). Two standard USB ports

• Small 3-mm × 3-mm × 0.9-mm SON-10 Package

can be supported from a single TPS2500 or TPS2501

• 15-kV / 8-kV System-Level ESD Capable

at the 1400-mA setting.

• UL Listed - File No. E169910

Additionally, the boost converter output is available as

an auxiliary 5.1-V output to power additional loads.

The total current supplied by the USB output and the

auxiliary cannot exceed 1148 mA at V

= 3 V.

BOOST EFFICIENCY

OUTPUT AUXILIARY CURRENT

(1) Requirement for USB applications only;

downstream facing ports should be

bypassed with 120 mF minimum per hub.

(2) Additional current can be supplied from

AUX if <1 A is required for USB ports;

total current should not exceed 1.1 A at

= 3 V.

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.

2Eco-mode, PowerPAD are trademarks of Texas Instruments.

3All other trademarks are the property of their respective owners.

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 (42 pages)

PAGE 1
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 INTEGRATED USB POWER SWITCH WITH BOOST CONVERTER Check for Samples: TPS2500, TPS2501 FEATURES APPLICATIONS • • • 1 23 • • • • • • • • • • Integrated Synchronous Boost Converter and USB Current-Limit Power Switch Light-Load, High-Efficiency Eco-mode™ Control Scheme (TPS2500) or Constant Frequency (TPS2501) 1.8-V to 5.25-V Input Voltage (2.
PAGE 2
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 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
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 Table 1. RECOMMENDED EXTERNAL COMPONENTS MIN NOM L Inductor (nominal value) CIN Input capacitance on IN (ceramic capacitor, X5R, 10V, 0805) 10 Boost output capacitance on AUX (ceramic capacitor, X5R, 10V, 1210) 22 CAUX RILIM MAX 2.2 UNIT 4.7 mH mF Additional AUX capacitance mF 150 Current-limit set resistor from ILIM to GND (recommended 1% or better) 16.
PAGE 4
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com ELECTRICAL CHARACTERISTICS — Boost Section Only (continued) over recommended operating conditions (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OVERVOLTAGE PROTECTION VOVP AUX overvoltage shutdown 1.05 × VAUX AUX rising V POWER STAGE Switch on resistance (SWN) Peak switch current limit, cycle-by-cycle (SWN MOSFET) ISW 3 IUPPER 80 120 4.5 6 mΩ A 6.
PAGE 5
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 PIN DESCRIPTIONS SIGNAL NAME NO. TYPE (1) DESCRIPTION AUX 10 O Fixed 5.1-V boost converter output. Connect a low-ESR ceramic capacitor from AUX to PGND. EN 4 I Enable input for boost converter. Tie to IN to enable. ENUSB 7 I Enable input for the USB switch. Tie to IN or AUX to enable. FAULT 8 O Active-low USB fault indicator (open-drain) GND 5 P Control/logic ground.
PAGE 6
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com FAULT FAULT is an open-drain output that indicates when the USB switch is in an overcurrent or overtemperature condition. FAULT has a fixed internal deglitch of tDEG to prevent false triggering from noise or transient conditions. FAULT asserts low if the USB switch remains in an overcurrent condition for longer than tDEG. FAULT de-asserts when the overcurrent condition is removed after waiting for the same tDEG period.
PAGE 7
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 FUNCTIONAL BLOCK DIAGRAM Backgate Control AUX IN SW CS USB HSD FB CS UVLO and Charge Pump LSD Gate Drive Current Limit ILIM ENUSB Boost Control Circuitry Thermal Sense 8-ms Deglitch FAULT IN EN Boost Bias, UVLO, Enable Logic, Ambient Thermal Sense GND PGND VUSB VTRIP 4.
PAGE 8
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 VIN + VLFM 4.35 V – www.ti.com VIN ³ VLFM ® 250 kHz VIN < VLFM ® 1 MHz 1-MHz/250-kHz Oscillator Slope Compensation Generator 85% Max Duty Cycle Generator Q S Error Amplifier + + S – INPUT LSD PWM Latch R – PWM Comparator Iind + – ISW 4.5 A – IINDLOW 420 mA + PFM Enter Comparator + – VAUX + 5% VAUX – 2% + IUPPER 6.
PAGE 9
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 PARAMETER MEASUREMENT INFORMATION (continued) IOS IOUT tIOS T0432-01 Figure 3. Response Time to Short-Circuit Waveform Decreasing Load Resistance VUSB Decreasing Load Resistance IUSB IOS M0134-01 Figure 4.
PAGE 10
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com 5.15 160 5.14 VIN = 4.5 V R(AUX) = Hi-Z 5.13 PMOS + USB 140 V(AUX) − Auxiliary Voltage − V RDS(on) − On-State Resisitance − mΩ TYPICAL CHARACTERISTICS 180 PMOS 120 100 80 NMOS 60 40 5.12 5.11 5.10 5.09 5.08 5.07 USB 20 5.06 0 −50 0 50 100 5.05 −50 150 TJ − Junction Temperature − °C 50 100 TJ − Junction Temperature − °C G003 Figure 5. MOSFET On-State Resistance vs Junction Temperature 150 G004 Figure 6.
PAGE 11
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 TYPICAL CHARACTERISTICS (continued) 9 6 VIN = 3.3 V 8 TJ = 85°C 5 Iq − Bias Current − µA Iq − Bias Current − µA 7 4 3 2 TJ = 25°C 6 5 4 3 2 1 TJ = −40°C 1 0 −50 0 0 50 100 150 TJ − Junction Temperature − °C Figure 9. Bias Current vs Junction Temperature, VIN = 3.3 V, VEN = 0 V (Disabled) 0 1 2 3 4 5 VIN − Input Voltage − V G007 6 G008 Figure 10.
PAGE 12
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com The USB switch is powered directly from VAUX and turns on once the UVLO of the USB switch is met (4.3 V typical). The turnon is controlled internally to provide a monotonic start-up on VUSB. Normal Operation The boost converter runs at a 1-MHz fixed frequency and regulates the output voltage VAUX using a pulse-width modulating (PWM) topology that adjusts the duty cycle of the low-side N-channel MOSFET on a cycle-by-cycle basis.
PAGE 13
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 Figure 11. Eco-mode Control Scheme Operation, VIN = 3.3 V, IAUX = 10 mA Overvoltage Protection The TPS2500 provides overvoltage protection on VAUX to protect downstream devices. Overvoltage protection is provided by disabling the gate drivers and power MOSFETs when an overvoltage condition is detected.
PAGE 14
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com typical plot assumes nominal conditions—2.2 mH inductor, 1-MHz/250-kHz switching frequency, nominal MOSFET on-resistances. The conservative plot assumes more pessimistic conditions—1.7 mH inductor, 925-kHz/230-kHz switching frequency, and maximum MOSFET on-resistances. The graph accounts for the frequency change from 1-MHz to 250-kHz when VIN > VLFM (4.35 V typical) and for the no-frequency mode when VIN > VNFM (5.
PAGE 15
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 POWER SWITCH Overview The TPS2500 integrates a current-limited, power-distribution switch using an N-channel MOSFET for applications where short circuits or heavy capacitive loads are encountered. The current-limit threshold is user-programmable between 130 mA and 1.4 A (typical) by selecting an external resistor.
PAGE 16
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com Programming the Current-Limit Threshold Resistor RILIM The overcurrent threshold is user programmable via an external resistor. The TPS2500 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 16.1 kΩ ≤ RILIM ≤ 200 kΩ to ensure stability of the internal regulation loop.
PAGE 17
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 1800 I(AUX) = 0 A VIN = 3.3 V I(LIMIT) − USB Current Limit − mA 1600 1400 1200 IOS(max) 1000 800 IOS(typ) 600 400 IOS(min) 200 0 20 30 40 50 60 70 80 90 R(ILIM) − Current-Limiting Resistance − kΩ 100 G009 Figure 13. USB Current-Limit Threshold vs RILIM Over Temperature and Process, VIN = 3.
PAGE 18
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com 325 1450 RL = 100 kΩ TJ = 25°C 1425 RL = 20 kΩ TJ = 25°C I(LIMIT) − USB Current Limit − mA I(LIMIT) − USB Current Limit − mA 300 VIN = 2.4 V 275 250 VIN = 3.3 V VIN = 4.75 V 225 1400 I(AUX) = 0 mA I(AUX) = 200 mA 1375 1350 I(AUX) = 500 mA 1325 I(AUX) = 400 mA 1300 200 175 0 200 400 600 800 I(AUX) − Auxiliary Current − mA 1250 3.25 1000 G012 4.25 4.75 5.25 G013 Figure 17.
PAGE 19
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 worst-case resistor tolerance assuming 1% resistor values. Step 1 follows the selection process outlined in the application examples above. Step 2 determines the upper and lower resistance bounds of the selected resistor. Step 3 uses the upper and lower resistor bounds in the IOS equations to calculate the threshold limits. It is important to use tighter tolerance resistors, e.g. 0.5% or 0.
PAGE 20
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com Figure 20. Efficiency vs AUX Current IN Capacitance Connect the input capacitance from IN to the reference ground plane. (See the Layout Recommendations section for connecting PGND and GND to the ground plane.) Input capacitance reduces the ac voltage ripple on the input rail by providing a low-impedance path for the switching current of the boost converter.
PAGE 21
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 USB Capacitance Connect the USB capacitance from USB to the reference ground plane. The USB capacitance is on the output of the power switch and provides energy for transient load steps. The TPS2500 does not require any USB capacitance for operation. Additional capacitance can be added on USB, but it is recommended to not exceed 220 mF to maintain adequate phase margin for the boost converter control loop.
PAGE 22
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com Grounding is an important part of the layout. The device has a PGND and a GND pin. The GND pin is the quiet analog ground of the device and should have its own separate ground pour; connect the quiet signals to GND including the RILIM resistor and any input decoupling capacitors to the GND pour. It is important that the RILIM resistor be tied to a quiet ground to avoid unwanted shifts in the current-limit threshold.
PAGE 23
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 APPLICATION INFORMATION Step-by-Step Design Procedure The following design procedure provides an example for selecting component values for the TPS2500. The following design parameters are needed as inputs to the design process.
PAGE 24
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com AUX Voltage The AUX voltage of the TPS2500 is internally fixed at 5.1 V. Determine Maximum Total Current (IAUX + IUSB) Using Figure 12, the maximum total current at VIN = 2.7 V is 1 A using the conservative line. The design requirements are met for this application.
PAGE 25
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 The peak inductor current is: Di = 2.42 A IL_pk = IIN + 2 The rms inductor current is: 2 æ Di ö IL_RMS = IIN2 + ç ÷ = è 2× 3 ø 2 æ 0.63 A ö (2.1 A )2 + ç ÷ = 2.11 A è 2× 3 ø Select a Coilcraft LPS4018-222ML inductor. This 2.2-mH inductor has a saturation current rating of 2.7 A and an rms current rating of 2.3 A. See the Component Recommendations section for specific additional information.
PAGE 26
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com It is also important to account for IOS shifts due to variation in VIN and IAUX, so by referencing the curves in the Programming the Current-Limit Threshold Resistor section (Figure 19, specifically) it can be seen that IOS will shift down by ~50 mA from the VIN = 3.3 V, IAUX = 0 A reference point at our maximum operating conditions of VIN = 4.2 V, IAUX = 500 mA.
PAGE 27
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 ADDITIONAL DESIGN EXAMPLE Specific Application Examples The Table 4 outlines several specific applications and component recommendations for the given electrical specifications. Table 4. Component Recommendations Application Example Electrical Specifications Description # of USB Ports Single-cell lithium ion battery or 3.3-V bus 1 100 2.7 4.2 100 Single-cell lithium ion battery or 3.3-V bus 2 0 2.7 4.
PAGE 28
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com APPLICATION CURVES 28 Figure 24. Efficiency vs IAUX, TPS2500 (Eco-mode Control Scheme) Figure 25. Efficiency vs IAUX, TPS2501 (Forced PWM Mode) Figure 26. Load Regulation, TPS2500 (Eco-mode Control Scheme) Figure 27.
PAGE 29
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 5.25 L = DR74-2R2 TJ = 25°C USB Switch Disabled V(AUX) − Auxiliary Voltage − V 5.20 5.15 I(AUX) = 0.25 A 5.10 I(AUX) = 0.5 A 5.05 I(AUX) = 0.75 A I(AUX) = 0 A I(AUX) = 1 A 5.00 I(AUX) = 1.25 A I(AUX) = 1.5 A 4.95 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIN − Input Voltage − V G021 Figure 28. Line Regulation, TPS2500 (Eco-mode Control Scheme) Figure 29. VAUX Ripple, VIN = 3.
PAGE 30
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com Figure 30. VAUX Ripple, VIN = 4.75 V, IAUX = 1 A Figure 31. Load Transient, VIN = 3.3 V, IAUX = 0.
PAGE 31
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 Figure 32. Load Transient, VIN = 3.3 V, IAUX = 1 A to 0.25 A Figure 33. Start-Up, VIN = 3.3 V, IAUX = 0.
PAGE 32
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com Figure 34. Start-Up, VIN = 3.3 V, IAUX = 0.5 A, USB Switch Enabled Figure 35. VIN = 3.
PAGE 33
TPS2500, TPS2501 www.ti.com SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 Figure 36. VIN = 3.3 V, USB Switch Thermal Cycle Due to Short on VUSB Figure 37. VIN = 3.
PAGE 34
TPS2500, TPS2501 SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010 www.ti.com REVISION HISTORY Changes from Original (October 2008) to Revision A • Page Changed From: Advanced Information To: Production Data ................................................................................................ 1 Changes from Revision A (August 2009) to Revision B Page • Added SW note to absolute maximum ratings table ..............................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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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 TPS2500DRCR 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 TPS2500DRCT SON DRC 10 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS2501DRCR 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) TPS2500DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS2500DRCT SON DRC 10 250 210.0 185.0 35.0 TPS2501DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS2501DRCT 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 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.