Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder WSON 8

4 5 6 7 8 9 10 11 12 13 14 15 16 17

Efficiency (%)

Input Voltage V (V)

0.1mA

0.25mA

1.0mA

10mA

100mA

250mA

V = 3.3V

L = 15 H VLF302515

C = 10 F

OUT

VIN

TPS62125

L 15 Hµ

OUT

µF

V = 3.3V

up to 300mA

OUT

V = 4V to 17V

GND

VOS

Fµ

pullup

PWR GOOD

EN_hys

576k

1.8M

TPS62125

www.ti.com

SLVSAQ5C –MARCH 2012–REVISED DECEMBER 2013

3V-17V, 300mA Step Down Converter With Adjustable Enable Threshold And Hysteresis

Check for Samples: TPS62125

FEATURES

DESCRIPTION

The TPS62125 is a high efficiency synchronous step

• Wide Input Voltage Range 3V to 17V

down converter optimized for low and ultra low power

• Input SVS (Supply Voltage Supervisor) with

applications providing up to 300mA output current.

Adjustable Threshold / Hysteresis Consuming

The wide input voltage range of 3V to 17V supports

Typical 6µA Quiescent Current

four cell alkaline and 1 to 4 cell Li-Ion batteries in

series configuration as well as 9V to 15V powered

• Wide Output Voltage Range 1.2V to 10V

applications. The device includes a precise low power

• Typical 13 µA Quiescent Current

enable comparator which can be used as an input

• 350nA Typical Shutdown Current

supply voltage supervisor (SVS) to address system

• Seamless Power Save Mode Transition

specific power up and down requirements. The

enable comparator consumes only 6µA quiescent

• DCS-Control™ Scheme

current and features an accurate threshold of 1.2V

• Low Output Ripple Voltage

typical as well as an adjustable hysteresis. With this

• Up to 1MHz Switching Frequency

feature, the converter can generate a power supply

rail by extracting energy from a storage capacitor fed

• Highest Efficiency over Wide V

and V

OUT

from high impedance sources such as solar panels or

Range

current loops. With its DCS - Control

scheme the

• Pin to Pin Compatible with TPS62160/70

converter provides power save mode operation to

• 100% Duty Cycle Mode

maintain highest efficiency over the entire load

current range. At light loads the converter operates in

• Power Good Open Drain Output

PFM mode (pulse frequency modulation) and

• Output Discharge Function

transitions seamlessly and automatically in PWM

• Small 2x2mm

SON 8 pin Package

(pulse width modulation) mode at higher load

currents. The DCS - Control

scheme is optimized

for low output ripple voltage in PFM mode in order to

APPLICATIONS

reduce output noise to a minimum and features

• Embedded processing

excellent AC load regulation. An open drain power

• 4 cell alkaline, 1-4 cell Li-Ion battery powered

good output indicates once the output voltage is in

applications

regulation.

• 9V - 15V standby power supply

• Energy harvesting

• Inverter (negative VOUT)

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.

2DCS-Control 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 (38 pages)

PAGE 1
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 3V-17V, 300mA Step Down Converter With Adjustable Enable Threshold And Hysteresis Check for Samples: TPS62125 FEATURES DESCRIPTION • • The TPS62125 is a high efficiency synchronous step down converter optimized for low and ultra low power applications providing up to 300mA output current.
PAGE 2
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 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. ORDERING INFORMATION TA –40°C to 85°C (1) (2) PART NUMBER (1) VOUT PACKAGE MARKING TPS62125 adjustable SAQ TPS62126 (2) 1.
PAGE 3
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 RECOMMENDED OPERATING CONDITIONS MIN Supply voltage VIN Output current capability MAX 17 3V ≤ VIN < 6V 200 6V ≤ VIN ≤ 17V 300 Operating ambient temperature TA (1) , (Unless Otherwise Noted) Operating junction temperature range, TJ (1) NOM 3 UNIT V mA –40 85 °C –40 125 °C In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be derated.
PAGE 4
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) TA = –40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted), VIN = 12V PARAMETER VREF_FB TEST CONDITIONS MIN Internal reference voltage of error amplifier TYP MAX 0.808 Referred to internal reference (VREF_FB) Feedback voltage line regulation IOUT = 100mA, 5V ≤ VIN ≤ 17V, VOUT = 3.3V Feedback voltage load regulation VOUT = 3.
PAGE 5
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 DEVICE INFORMATION PIN ASSIGNMENTS DSG PACKAGE (TOP VIEW) 8 1 2 3 4 TH E ER XP M OS A ED L PA D GND VIN EN EN_hys 7 6 5 PG SW VOS FB PIN FUNCTIONS PIN NAME NO. I/O DESCRIPTION GND 1 PWR GND supply pin. VIN 2 PWR VIN power supply pin. EN 3 IN Input pin for the enable comparator. Pulling this pin to GND turns the device into shutdown mode.
PAGE 6
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com FUNCTIONAL BLOCK DIAGRAM ON/ SD VREF EN 1.2V VREF_FB 0.808V Softstart Softstart PG Comparator EN VREF PG VTH_PG UVLO Comparator FB VIN EN Comparator VUVLO EN_hys DC-DC ON/OFF EN_comp Peak Current Limit Comparator GND Limit High Side Timer DCS Control VOS VIN Control Logic Min. On VOS VIN PMOS Min.
PAGE 7
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 TYPICAL CHARACTERISTICS Table 1. Table Of Graphs PARAMETER Efficiency Output Voltage VOUT peak to peak Output Ripple Voltage VOUTpp Switching frequency fSW Shutdown current Quiescent Current EN Comparator Thresholds RDSON Typical Operation Line transient response Hotplug vs. Output Current VOUT = 1.8V, VOUT = 3.3V, VOUT = 5V, VOUT = 6.8V, VOUT = 8V , VOUT = 10V Figure 1, Figure 3, Figure 5, Figure 7, Figure 9, Figure 11 vs.
PAGE 8
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com 95 95 90 90 85 85 80 80 Efficiency (%) Efficiency (%) 10mA VIN = 3V VIN = 5V VIN = 7.5V VIN = 9V VIN = 12V VIN = 15V 75 70 65 60 50 0.01 0.1 1 10 Output Current IOUT (mA) 250mA 1.0mA 75 VOUT = 1.8V L = 15mH LPS3314 COUT = 10mF 70 0.25mA 65 60 VOUT = 1.8V L = 15mH LPS3314 COUT = 10mF 55 100mA 100 0.1mA 55 50 1000 3 Figure 1. Efficiency vs. Output Current VOUT = 1.
PAGE 9
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 100 100 95 95 90 90 10mA 250mA 85 85 VIN = 6.0V VIN = 7.5V VIN = 9.0V VIN = 12V VIN = 15V 80 75 Efficiency (%) Efficiency (%) 100mA 70 80 70 65 60 60 55 55 50 0.01 0.1 1 10 100 Output Current IOUT (mA) 0.25mA 75 VOUT = 5V L = 10mH LPS3314 COUT = 2x10mF 65 1.0mA 50 1000 VOUT = 5V L = 10mH LPS3314 COUT = 2x10mF 6 Figure 5. Efficiency vs.
PAGE 10
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com 100 100 95 95 90 90 10mA 250mA 1.0mA 85 85 VIN = 9.0V VIN = 12V VIN = 15V 80 Efficiency (%) Efficiency (%) 100mA 75 VOUT = 8V L = 10mH LPS3314 COUT = 10mF+22mF 70 65 80 0.25mA 75 70 60 60 55 55 50 0.01 0.1 1 10 100 Output Current IOUT (mA) VOUT = 8V L = 10mH LPS3314 COUT = 10mF + 22mF 65 50 1000 Figure 9. Efficiency vs. Output Current, VOUT = 8V 9 10 11 12 13 14 Input Voltage VIN (V) 0.
PAGE 11
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 3.4 3.432 VOUT 3.3V L = 15mH, COUT = 10mF VIN = 5V, TA = -40°C VIN = 7.5V, TA = -40°C VIN = 12V, TA = -40°C 3.366 3.35 Output Voltage (V) Output Voltage [V] 3.399 VOUT 3.3V L = 15mH, COUT = 10mF 3.333 VIN = 5V, TA= 25°C VIN = 7.5V, TA = 25°C VIN = 12V, TA = 25°C VIN = 5V, TA = 85°C VIN = 7.5V, TA = 85° VIN = 12V, TA = 85° 3.300 3.267 3.234 0.01 0.1 1 10 Output Current [mA] 100 3.
PAGE 12
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com 6.968 6.9 VOUT 6.7V L = 10mH, COUT = 2x10mF 6.85 6.901 VIN = 12V, TA = 25°C VIN = 9V, TA = -40°C 6.834 6.8 VIN = 9V, TA = 25°C Output Voltage [V] Output Voltage [V] VIN = 12V, TA = -40°C 6.767 VIN = 9V, TA = 85° 6.700 VIN = 12V, TA = 85° VOUT 6.7V L = 10mH, COUT = 2x10mF 0.1 6.7 6.65 IOUT = 1mA IOUT = 25mA IOUT = 100mA IOUT = 250mA 6.6 6.633 6.566 0.01 6.75 1 10 Output Current [mA] 100 6.55 6.5 1000 Figure 17.
PAGE 13
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 1000 40 VIN = 12V 900 VOUT = 3.3V L = 15mH COUT = 10mF Switch Frequency fSW( kHz) Output Ripple Voltage (mVpp) 50 30 20 VIN = 15V 800 700 VIN = 7.5V 600 500 VIN = 5V 400 300 VIN = 5.0V VIN = 7.5V VIN = 12V VIN = 15V 10 0 0 50 100 150 200 Output Current (mA) 250 VOUT = 3.3V L = 15mH COUT = 10mF 200 100 0 300 0 Figure 21. Output Ripple Voltage vs. Output Current, VOUT = 3.3V 1100 250 300 Figure 22.
PAGE 14
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com 25 1.5 1.4 1.3 TA = 85°C 1.2 20 Quiescent Current IQ (mA) Shutdown Current - ISD [mA] 1.1 TA = 60°C 1.0 0.9 TA = 25°C 0.8 TA = 0°C 0.7 0.6 TA = -40°C 0.5 IQ no switching: TA= 85°C IQ no switching: TA= 60°C 15 IQ no switching: TA= 25°C 10 IQ no switching: TA= -40°C 0.4 IQ device switching: TA= 25°C, VOUT = 1.8V, IOUT = 0mA no load, EN = VIN 5 0.3 0.2 0.
PAGE 15
TPS62125 1.25 1.245 1.24 1.235 1.23 1.225 1.22 1.215 1.21 1.205 1.2 1.195 1.19 1.185 1.18 1.175 1.17 1.165 1.16 1.155 1.15 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 3 2.8 2.6 2.4 VTH EN ON TA = 25°C VTH EN ON TA = -40°C 2.2 VTH EN ON TA = 85°C TA = 85°C 2 RDSON (W) EN Comparator Threshold - VTH EN (V) www.ti.com TA = 60°C 1.8 1.6 1.4 1.2 1 VTH EN OFF TA = 25°C VTH EN OFF TA = -40°C VTH EN OFF TA = 85°C TA = 0°C TA = -40°C 0.8 TA = 25°C 0.6 0.4 0.
PAGE 16
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 VOUT = 3.3 V 3.3V offset, 50mV/Div ILoad = 100mA www.ti.com VIN = 12V L = 15 mH COUT = 10 mF VOUT = 3.3 V 3.3V offset, 50mV/Div VIN = 12V L = 15 mH COUT = 10 mF SW pin 10V/Div SW pin 10V/Div IOUT 5mA to 200mA 200mA/Div Inductor current 200mA/Div Inductor current 200mA/Div Figure 33. PWM Mode VOUT= 3.3V, IOUT = 100mA VOUT = 3.3 V 3.3V offset, 50mV/Div VIN = 12V L = 15 mH COUT = 10 mF Figure 34. Load Transient 5mA to 200mA, VOUT = 3.
PAGE 17
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 VIN = 12V, Hotplug CIN = 10mF ceramic capacitor VIN overshoot 25V VIN = 9V to 12V IOUT = 100mA L = 15 mH COUT = 10 mF VOUT = 3.3 V, 50mV/Div Current into input capacitor 20A/div IIN Figure 39. Line transient response VIN = 9V to 12V VIN overshoot reduction to 15V Figure 40. VIN Hotplug overshoot VOUT = 5.
PAGE 18
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 VIN: 0.5mA current source 2.5V/Div REN1 = 680kW REN2 = 110kW REN2 = 120kW VIN_startup = 6.82V VIN_stop = 4.55V www.ti.com CIN = 10mF ceramic + 22mF Poscap VIN = 12V VOUT = 1.8 V L = 15 mH COUT = 10 mF Load = 180W VOUT = 3.3 V L = 15 mH, COUT = 10 mF 7ms/20mA Pulse Load VOUT 2.0V/Div Startup in 20mA Load IOUT 20mA/Div 0.5mA Source Current IIN: 0.5mA/Div Figure 45. 0.5mA current source, 20mA pulse load VIN = 12V VOUT = 3.
PAGE 19
TPS62125 www.ti.com VIN 1V/Div SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 VIN_stop = 4.55V REN1 = 680kW REN2 = 110kW REN_hys = 120kW VIN = 12V to 0V VOUT = 3.3 V COUT = 10uF L = 15mH IOUT = 0mA RPullup PG = 0W to VOUT VIN 2V/Div VOUT 1V/Div VIN_stop = 4.55V REN1 = 680kW REN2 = 110kW REN_hys = 120kW VIN = 12V to 0V VOUT = 3.3 V COUT = 10uF L = 15mH IOUT = 0mA RPullup PG = 100kW to VOUT VOUT 1V/Div PG 1V/Div Figure 51. Output discharge using PG pin, triggered by EN Comparator Figure 52.
PAGE 20
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com DETAILED DESCRIPTION DCS - ControlTM The TPS62125 high efficiency synchronous switch mode buck converter includes TI's DCS - Control™ (Direct Control with Seamless Transition into Power Save Mode), an advanced regulation topology, which combines the advantages of hysteretic and voltage mode control.
PAGE 21
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 The transition from PFM mode to PWM mode operation and back occurs at a load current of approximately ½ ILPFMpeak.
PAGE 22
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com ENABLE COMPARATOR (EN / EN_hys) The EN pin is connected to an On/Shutdown detector (ON/SD) and an input of the Enable Comparator. With a voltage level of 0.4V or less at the EN pin, the ON/SD detector turns the device into Shutdown mode and the quiescent current is reduced to typically 350nA. In this mode the EN comparator as well the entire internal-control circuitry are switched off. A voltage level of typ.
PAGE 23
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 APPLICATION INFORMATION OUTPUT VOLTAGE SETTING The output voltage can be calculated by: æ R ö VOUT = VREF _ FB ´ çç1 + 1 ÷÷ è R2 ø æ R VOUT = 0.8V ´ çç1 + 1 è R2 ö æV R1 = R2 ´ ç OUT - 1÷ ø è 0.8V ö ÷÷ ø (5) The internal reference voltage for the error amplifier, VREF_FB, is nominal 0.808V. However for the feedback resistor divider selection, it is recommended to use the value 0.800V as the reference.
PAGE 24
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com ENABLE THRESHOLD AND HYSTERESIS SETTING ON/SD VIN VIN VREF 1.2V REN1 EN EN Comparator VTH_EN REN2 EN_hys REN HYS GND Figure 53. Using the Enable Comparator Threshold and Hysteresis for an input SVS (supply voltage supervisor) The enable comparator can be used as an adjustable input supply voltage supervisor (SVS) to start and stop the DC/DC converter depending on the input voltage level.
PAGE 25
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 VIN DC/DC start VIN_startup Hysteresis VIN_stop DC/DC stop VOUT Proper VOUT ramp up Figure 54. Using the EN comparator as input SVS for proper VOUT ramp up POWER GOOD (PG) PULL UP / OUTPUT DISCHARGE RESISTOR The Power Good open collector output needs an external pull up resistor to indicate a high level. The pull up resistor can be connected to a voltage level up to 10V. The output can sink current up to 0.
PAGE 26
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR) The external components have to fulfill the needs of the application, but also the stability criteria of the devices control loop. The TPS62125 is optimized to work within a range of L and C combinations. The LC output filter inductance and capacitance have to be considered together, creating a double pole, responsible for the corner frequency of the converter.
PAGE 27
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 In DC/DC converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e. quality factor) and by the inductor DCR value. To achieve high efficiency operation, care should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing the inductor value produces lower RMS currents, but degrades transient response.
PAGE 28
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com Table 5. List of Capacitor CAPACITANCE [µF] SIZE CAPACITOR TYPE USAGE SUPPLIER 10 0805 GRM21B 25V X5R CIN /COUT Murata 10 0805 GRM21B 16V X5R COUT Murata 22 1206 GRM31CR61 16V X5R COUT Murata 22 B2 (3.5x2.8x1.9) 20TQC22MYFB CIN / input protection Sanyo . LAYOUT CONSIDERATIONS As for all switching power supplies, the layout is an important step in the design.
PAGE 29
TPS62125 www.ti.com SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 TYPICAL APPLICATIONS TPS62125 VIN = 4V to 17V VIN SW R1 1.8M VOS EN CIN 10µF VOUT = 3.3V up to 300mA L 15µH FB COUT 10µF R2 576k EN_hys Rpullup GND PG PWR GOOD Figure 57. TPS62125 3.3V Output Voltage Configuration TPS62125 VIN = 6V to 17V VIN SW R1 1.1M VOS EN CIN 10µF VOUT = 5V up to 300mA L 10µH FB R2 210k EN_hys COUT 2 x 10µF or 1 x 22µF Rpullup GND PG PWR GOOD Figure 58. TPS62125 5.
PAGE 30
TPS62125 SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013 www.ti.com VIN_Start = 6.82V VIN_Stop = 4.55V TPS62125 SW VIN Current Source 0.5mA 10V max REN1 610k CIN 22µF Poscap CIN 10µF R1 1.8M VOS FB EN R2 REN2 110k VOUT = 3.3V up to 300mA L 15µH COUT 10µF R2 576k EN_hys REN_hys 120k Rpullup 100k GND PG PWR Good Figure 60. TPS62125 operation from a storage capacitor charged from a 0.5mA current source, VOUT = 3.3V, see Figure 45 CIN 10µF TPS62125 VIN = 5V VOS EN GND R1 1.
PAGE 31
PACKAGE OPTION ADDENDUM www.ti.
PAGE 32
PACKAGE OPTION ADDENDUM www.ti.com 9-Dec-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 33
PACKAGE MATERIALS INFORMATION www.ti.com 9-Dec-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 TPS62125DSGR WSON DSG 8 3000 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62125DSGT WSON DSG 8 250 180.0 8.4 2.3 2.3 1.15 4.0 8.
PAGE 34
PACKAGE MATERIALS INFORMATION www.ti.com 9-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62125DSGR WSON DSG 8 3000 210.0 185.0 35.0 TPS62125DSGT WSON DSG 8 250 210.0 185.0 35.
PAGE 35
PAGE 36
PAGE 37
PAGE 38
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.