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VIN

TPS62120

L 22 Hm

GND

SGND

VOUT

pullup100k

PWRGOOD

V =2.5Vto15V

4.7 F

300k

240k

Cff

22pF

V =1.8V

upto75mA

OUT

4.7 F

OUT

0.1 1 10 100

I -OutputCurrent-mA

100

Efficiency-%

V =5.5V

V =8V

V =10V

V =12V

V =15V

V =5V,

L =18 H,

LPS3015,

C =4.7 F

TPS62120

TPS62122

www.ti.com

SLVSAD5 –JULY 2010

15V, 75mA High Efficient Buck Converter

Check for Samples: TPS62120 , TPS62122

FEATURES

DESCRIPTION

• Wide Input Voltage Range 2V to 15V

• Up to 96% Efficiency

The TPS6212X device family is a high efficient

synchronous step down DC-DC converter optimized

• Power Save Mode with 11 µA Quiescent

for low power applications. It supports up to 75mA

Current

output current and allows the use of tiny external

• Output Current 75mA

inductors and capacitors.

• Output Voltage Range 1.2V to 5.5V

The wide operating input voltage range of 2V to 15V

• Up to 800kHz Switch Frequency

supports energy harvesting, battery powered and as

well 9V or 12V line powered applications.

• Synchronous Converter, no External Rectifier

• Low Output Ripple Voltage

With its advanced hysteretic control scheme the

converter provides power save mode operation. At

• 100% Duty Cycle for Lowest Dropout

light loads the converter operates in PFM mode

• Small SOT 8 pin (TPS62120) and 2x2 SON 6

(pulse frequency modulation) and transitions

pin (TPS62122) Package

automatically in PWM (pulse width modulation) mode

• Internal Soft Start

at higher load currents. The Power Save Mode

maintains high efficiency over the entire load current

• Power Good Open Drain Output TPS62120

range. The hysteretic control scheme is optimized for

• Open Drain Output for Output Discharge

low output ripple voltage in PFM mode in order to

TPS62120

reduce output noise to a minimum. It consumes only

• 2.5V Rising / 1.85V Falling UVLO Thresholds

10uA quiescent current from VIN in PFM mode

operation.

APPLICATIONS

In shutdown mode, the device is turned off.

• Low Power RF Applications

An open drain power good output is available in the

• Ultra Low Power Microprocessor

TPS62120 and indicates once the output voltage is in

• Energy Harvesting

regulation.

• Industrial Measuring

TPS62120 has an additional SGND pin which is

connected to GND during shutdown mode. This

output can be used to discharge the output capacitor.

The TPS62120 is available in a small 3×3 mm

8 pin

SOT 23 package and the TPS62122 in a 2×2 mm

pin SON 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.

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 (34 pages)

PAGE 1
TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 15V, 75mA High Efficient Buck Converter Check for Samples: TPS62120 , TPS62122 FEATURES 1 • • • • • • • • • • • • • • Wide Input Voltage Range 2V to 15V Up to 96% Efficiency Power Save Mode with 11 µA Quiescent Current Output Current 75mA Output Voltage Range 1.2V to 5.
PAGE 2
TPS62120 TPS62122 SLVSAD5 – JULY 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.
PAGE 3
TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 RECOMMENDED OPERATING CONDITIONS MIN Supply voltage VIN, device in operation Output current capability NOM MAX 2 VIN = 2 V, VOUT = 1.8 V, DCRL = 0.7 Ω 25 VIN ≥ 2.5 V, VOUT = 1.8 V, DCRL = 0.7 Ω 75 15 UNIT V mA Effective inductance 10 22 33 µH Effective output capacitance 1.0 2 33 µF Output voltage range 1.2 5.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VIN = 8V, VOUT = 1.8V, EN = VIN, TJ = –40°C to 85°C, typical values are at TJ = 25°C (unless otherwise noted), CIN = 4.7µF, L = 22µH, COUT = 4.7µF, see Parameter Measurement Information PARAMETER TEST CONDITIONS MIN TYP MAX UNIT REGULATOR tONmin Minimum ON time VIN = 3.6 V, VOUT = 1.8 V 700 ns tOFFmin Minimum OFF time VIN = 3.6 V, VOUT = 1.8 V 60 ns VREF Internal reference voltage 0.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 DEVICE INFORMATION PIN ASSIGNMENTS SOT-23 8 pin out DCN PACKAGE (TOP VIEW) SW 1 VOUT 2 FB 3 TH E ER XP M OS A ED L PA D 2x2SON 6 pin out DRV PACKAGE (TOP VIEW) 6 GND VIN 1 8 VOUT 5 VIN GND 2 7 SW 4 EN EN 3 6 PG SGND 4 5 FB PIN FUNCTIONS PIN NAME DRV NO. DCN NO. I/O DESCRIPTION VIN 5 1 PWR VIN power supply pin. GND 6 2 PWR GND supply pin. EN 4 3 IN Pulling this pin to high activates the device. Low level shuts it down.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com FUNCTIONAL BLOCK DIAGRAM VIN VIN Voltage Reference VREF 0.80 V UVLO Peak Current Limit Comparator VUVLO Limit High Side EN Softstart VIN PMOS Min. On Time VOUT Gate Driver Anti Shoot-Through Control Logic Min.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 PARAMETER MEASUREMENT INFORMATION (continued) VIN = 2 V to 15 V TPS62122 VIN SW R1 CIN 4.7 µ F EN VOUT 1.2 V - 5 V up to 75mA L 18 mH/22 mH Cff FB COUT 4.7 mF R2 GND VOUT L = 18 µ H LPS3015 Coilcraft 22 mH LQH3NPN Murata CIN: 4.7µF GRM21B series X5R (0805size) 25V Murata COUT: 4.7µF GRM188 sereis X5R (0603size) 6.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS EFFICIENCY vs OUTPUT CURRENT IOUT (VOUT = 5V) EFFICIENCY vs INPUT VOLTAGE VIN (VOUT = 5V) 100 100 IO = 10 mA VIN = 5.5 V 95 VO = 5 V, IO = 25 mA IO = 50 mA 90 VIN = 8 V VIN = 10 V VIN = 15 V IO = 5 mA 85 VIN = 12 V Efficiency - % Efficiency - % 80 L = 18 mH, LPS3015 CO = 4.7mF 90 70 60 IO = 1 mA 80 75 IO = 0.1mA 70 65 50 VO = 5 V, 60 L = 18 mH, LPS3015, CO = 4.7 mF 40 30 0.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 TYPICAL CHARACTERISTICS (continued) EFFICIENCY vs OUTPUT CURRENT IOUT (VOUT = 3.0V) 100 VIN = 3.5 V EFFICIENCY vs INPUT VOLTAGE VIN (VOUT = 3.0V) 100 VIN = 7 V VIN = 5 V IO = 25 mA 90 VO = 3 V, IO = 50 mA L = 18 mH, LPS3015, CO = 4.7 mF 90 80 70 IO = 1 mA 80 Efficiency - % Efficiency - % VIN = 9 V VIN = 12 V VIN = 15 V 60 IO = 5 mA IO = 10 mA 70 IO = 0.1 mA 60 50 VO = 3 V, L = 18 mH, LPS3015, CO = 4.7 mF 40 30 0.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) EFFICIENCY vs OUTPUT CURRENT IOUT (VOUT = 1.2V) EFFICIENCY vs INPUT VOLTAGE VIN (VOUT = 1.2V) 100 VIN = 5 V 90 VIN = 3 V VIN = 4 V 100 VIN = 2 V VO = 1.2 V, 90 IO = 10 mA 80 IO = 25 mA L = 18 mH, LPS3015, CO = 4.7 mF IO = 50 mA 80 VIN = 8 V 60 Efficiency - % Efficiency - % 70 VIN = 10 V VIN = 12 V 50 VIN = 15 V 40 70 IO = 1 mA 50 30 VO = 1.2 V, 20 10 0 0.1 1 10 IO - Output Current - mA IO = 0.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 TYPICAL CHARACTERISTICS (continued) LOW-SIDE SWITCH RESISTANCE RDS(ON) vs VIN QUIESCENT CURRENT vs VIN 3.5 20 16 TA = 85°C 2.5 Iq - Quiescent current - mA RDSon - Low side Switch Resistance - W 18 3 TA = 60°C TA = 25°C TA = -40°C 2 1.5 1 TA = 85°C 14 TA = 60°C 12 TA = 25°C 10 8 TA = -40°C 6 Device enabled and UVLO rising threshold has been tripped 4 0.5 2 0 0 0 2 4 6 8 10 VI - Input Voltage - V 12 14 0 16 2 4 Figure 14.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCH FREQUENCY vs OUTPUT CURRENT IOUT (VOUT = 3.3V) 900 800 VOUT = 3.3 V, SWITCH FREQUENCY vs OUTPUT CURRENT IOUT (VOUT = 5.0V) 900 VIN = 9 V L = 22 mH LQH3NPN, COUT = 4.7 mF VOUT = 5.0 V, VIN = 7 V 800 700 L = 18 mH LPS3015, COUT = 4.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 TYPICAL CHARACTERISTICS (continued) TYPICAL OPERATION IOUT 10mA LINE TRANSIENT RESPONSE FOR 3V OUTPUT VOLTAGE Figure 21. Figure 22. LOAD TRANSIENT RESPONSE FOR 3V OUTPUT VOLTAGE AC LOAD REGULATION PERFORMANCE FOR 3V OUTPUT VOLTAGE Figure 23. Figure 24.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) TPS62120 SPURIOUS OUTPUT NOISE COUT = 4.7 µF TPS62120 SPURIOUS OUTPUT NOISE COUT = 10 µF VIN = 10V VIN = 5V VIN = 10V VIN = 3.3V 14 VIN = 5V Load = 68R L = 22uH (LQH32PN) COUT = 4.7uF (0603) VOUT = 1.8V VIN = 3.3V Load = 68R L = 22uH (LQH32PN) COUT = 10uF (0805) VOUT = 1.8V Figure 25. Figure 26. AC LOAD REGULATION PERFORMANCE FOR 1.8V OUTPUT VOLTAGE OUTPUT DISCHARGE WITH SGND PIN CONNECTED TO VOUT Figure 27.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 TYPICAL CHARACTERISTICS (continued) STARTUP VOUT = 3.0V POWER GOOD OUTPUT DURING STARTUP Figure 29. Figure 30. STARTUP VOUT 1.8V OUTPUT OVERLOAD PROTECTION Figure 31. Figure 32.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) 16 INPUT VOLTAGE RAMP UP/DOWN STARTUP FROM A HIGH IMPEDANCE SOURCE Figure 33. Figure 34.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 DETAILED DESCRIPTION OPERATION The TPS6212x synchronous step down converter family uses an unique hysteretic PFM/PWM controller scheme which enables switching frequencies of up to 800kHz, excellent transient response and AC load regulation at operation with small output capacitors.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com The maximum switch frequency can be estimated to: 1 fSWmax » = 770 kHz 1.3 μs (3) 100% DUTY CYCLE LOW DROPOUT OPERATION The device will increase the On Time of the high-side MOSFET switch once the input voltage comes close to the output voltage in order to keep the output voltage in regulation. This will reduce the switch frequency. With further decreasing input voltage VIN the high-side MOSFET switch is turned on completely.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 POWER GOOD OUTPUT The Power Good Output is an open drain output available in TPS62120. The circuit is active once the device is enabled. It is driven by an internal comparator connected to the FB voltage and internal reference. The PG output provides a high level (open drain high impedance) once the feedback voltage exceeds typical 95% of its nominal value. The PG output is driven to low level once the feedback voltage falls below typ.
PAGE 20
TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com APPLICATION INFORMATION VOUT 1.8 V 25 mA TPS62120 VIN = 2 V to 15 V L 22 µH SW VIN CIN 4.7 µF R1 300 kW EN FB COUT 4.7 µF Cff 22pF R2 240 kW GND VOUT Rpullup100 kW SGND PWR GOOD PG Figure 35. TPS62120 1.8V Output Voltage Configuration VOUT 3.06 V 75 mA TPS62120 VIN = 3.5 V to 15 V L 22 µH SW VIN CIN 4.7 µF R1 510 kW EN FB COUT 4.7 µF Cff 22 pF R2 180 kW GND VOUT Rpullup100 kW SGND PWR GOOD PG Figure 36. TPS62120 3.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 High Impedance Source VOUT 1.8 V 100 µA TPS62120 L 22 µH SW VIN 1 kW DC 12 V R1 300 kW EN CIN 10 µF FB Cff 22 pF COUT 4.7 µF R2 240 kW GND VOUT Rpullup100 kW SGND PWR GOOD PG Figure 38. TPS62120 1.8V VOUT Configuration Powered from a High-Impedance Source OUTPUT VOLTAGE SETTING The output voltage can be calculated to: ( VOUT = VREF ´ 1 + R1 = (VV OUT REF R1 R2 ) with an internal reference voltage VREF typical 0.
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TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com INDUCTOR SELECTION The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage ripple and the efficiency. The selected inductor has to be rated for its DC resistance and saturation current. The inductor ripple current (ΔIL) decreases with higher inductance and increases with higher VIN or VOUT and can be estimated according Equation 8.
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TPS62120 TPS62122 www.ti.com SLVSAD5 – JULY 2010 INPUT CAPACITOR SELECTION Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is required for best input voltage filtering and minimizing the interference with other circuits caused by high input voltage spikes. For most applications a 4.7µF to 10µF ceramic capacitor is recommended. The voltage rating and DC bias characteristic of ceramic capacitors need to be considered.
PAGE 24
TPS62120 TPS62122 SLVSAD5 – JULY 2010 www.ti.com Use a common Power GND node and a different node for the signal GND to minimize the effects of ground noise. Keep the common path to the GND PIN, which returns the small signal components and the high current of the output capacitors as short as possible to avoid ground noise. The FB divider network and the VOUT line must be connected to the output capacitor. The VOUT pin of the converter should be connected via a short trace to the output capacitor.
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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 24-Jan-2014 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) TPS62120DCNR SOT-23 DCN 8 3000 180.0 8.4 3.17 1.37 4.0 8.0 Q3 TPS62120DCNR SOT-23 DCN 8 3000 179.0 8.4 3.2 TPS62120DCNT SOT-23 DCN 8 250 180.0 8.4 3.23 3.2 1.4 4.0 8.0 Q3 3.17 1.37 4.0 8.0 TPS62120DCNT SOT-23 DCN 8 250 179.0 8.4 3.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Jan-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62120DCNR SOT-23 DCN 8 3000 202.0 201.0 28.0 TPS62120DCNR SOT-23 DCN 8 3000 203.0 203.0 35.0 TPS62120DCNT SOT-23 DCN 8 250 202.0 201.0 28.0 TPS62120DCNT SOT-23 DCN 8 250 203.0 203.0 35.0 TPS62122DRVR SON DRV 6 3000 210.0 185.0 35.0 TPS62122DRVR SON DRV 6 3000 203.0 203.0 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.