Datasheet

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Vout

1.8V/3A

Vin

2.5V to 5.5V

PVIN

22mF

1 Hm

22mF

200k

TLV62090

Power Good

AVIN

160k

500k

AGND

10nF

VOS

DEF

10nF

PGND PGND

14 15

100

100m 1 10 100 1k 10k

I load (mA)

Efficiency (%)

= 3.7 V

= 4.2 V

= 5 V

OUT

= 3.3 V

L = 1 µH

f = 1.4 MHz

G002

TLV62090

www.ti.com

SLVSBB9B –MARCH 2012–REVISED APRIL 2012

3A High Efficient Synchronous Step Down Converter with DCS™ Control

Check for Samples: TLV62090

FEATURES

DESCRIPTION

The TLV62090 device is a high frequency

• 2.5 V to 5.5 V Input Voltage Range

synchronous step down converter optimized for small

• DCS™ Control

solution size, high efficiency and suitable for battery

• 95% Converter Efficiency

powered applications. To maximize efficiency, the

converter operates in PWM mode with a nominal

• Power Save Mode

switching frequency of 1.4 MHz and automatically

• 20 µA Operating Quiescent Current

enters Power Save Mode operation at light load

• 100% Duty Cycle for Lowest Dropout

currents. When used in distributed power supplies

and point of load regulation, the device allows voltage

• 1.4 MHz Typical Switching Frequency

tracking to other voltage rails and tolerates output

• 0.8 V to V

Adjustable Output Voltage

capacitors ranging from 10 µF up to 150 µF and

• Output Discharge Function

beyond. Using the DCS™ Control topology the device

achieves excellent load transient performance and

• Adjustable Softstart

accurate output voltage regulation.

• Two Level Short Circuit Protection

The output voltage start-up ramp is controlled by the

• Output Voltage Tracking

softstart pin, which allows operation as either a

• Wide Output Capacitance Selection

standalone power supply or in tracking configurations.

• Available in 3x3mm 16 Pin QFN Package

Power sequencing is also possible by configuring the

Enable and Power Good pins. In Power Save Mode,

APPLICATIONS

the device operates at typically 20 µA quiescent

current. Power Save Mode is entered automatically

• Distributed Power Supplies

and seamlessly maintaining high efficiency over the

• Notebook, Netbook Computers

entire load current range.

• Hard Disk Drivers

• Processor Supply

• Battery Powered Applications

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.

2All 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 (23 pages)

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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 3A High Efficient Synchronous Step Down Converter with DCS™ Control Check for Samples: TLV62090 FEATURES DESCRIPTION • • • • • • • • • • • • • • The TLV62090 device is a high frequency synchronous step down converter optimized for small solution size, high efficiency and suitable for battery powered applications. To maximize efficiency, the converter operates in PWM mode with a nominal switching frequency of 1.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 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 (1) (1) TA ORDERING PACKAGE PACKAGE MARKING -40°C to 85°C TLV62090 RGT SBV For detailed ordering information please see the PACKAGE OPTION ADDENDUM section at the end of the datasheet.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 ELECTRICAL CHARACTERISTICS VIN = 3.6V, TA = –40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VIN Input voltage range IQIN Quiescent current Not switching, FB = FB +5 %, Into PVIN and AVIN 20 Isd Shutdown current Into PVIN and AVIN 0.6 5 Undervoltage lockout threshold VIN falling 2.2 2.3 UVLO 2.5 2.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 www.ti.com DEVICE INFORMATION PG 4 EN 14 13 12 11 Exposed Thermal Pad* 10 5 6 7 8 CN 3 PGND DEF 15 CP 2 PGND SW 16 AGND 1 FB SW VOS 16 PIN 3x3mm QFN TOP VIEW 9 PVIN PVIN AVIN SS NOTE: *The exposed Thermal Pad is connected to AGND. PIN FUNCTIONS PIN I/O DESCRIPTION NAME NO. SW 1, 2 I Switch pin of the power stage. DEF 3 I This pin is used for internal logic and needs to be pulled high.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 FUNCTIONAL BLOCK DIAGRAM CP PG PVIN CN Charge Pump for Gate driver VFB Hiccup current limit #32 counter VREF High Side Current Sense Bandgap Undervoltage Lockout Thermal shutdown AVIN PVIN EN M1 400 kΩ SW MOSFET Driver Anti Shoot Through Converter Control Logic AGND SW DEF M2 PGND PGND Comparator ramp Timer ton Direct Control and Compensation VOS Error Amplifier FB Vref 0.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 www.ti.com Table 1. List of components REFERENCE DESCRIPTION MANUFACTURER TLV62090 High efficient step down converter Texas Instruments L1 Inductor: 1uH Coilcraft XFL4020-102 C1 Ceramic capacitor: 22uF (6.3V, X5R, 0805) C2 Ceramic capacitor: 22uF (6.3V, X5R, 0805) C3, C4 Ceramic capacitor Standard R1, R2, R3 Resistor Standard TLV62090 Vin 2.5V to 5.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 TYPICAL CHARACTERISTICS FIGURE vs load current (VO = 3.3 V) Figure 2 Efficiency vs load current (VO = 1.8 V) Figure 3 Efficiency vs load current (VO = 1.05 V) Figure 4 Output voltage vs load current (VO = 1.8 V) Figure 5 High Side FET on-resistance vs input voltage Figure 6 Switching frequency vs load current (VO = 1. 8 V) Figure 7 Switching frequency vs input voltage (VO = 1.
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TLV62090 www.ti.com 70 1600 60 1400 1200 50 Frequency (kHz) Resistance (Ω) SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 40 30 20 2 2.5 3 3.5 4 4.5 5 Input Voltage (V) 5.5 6 VOUT = 1.8 V L = 1 µH f = 1.4 MHz 800 600 400 TA = 85°C TA = 25°C TA = −40°C 10 0 1000 VIN = 3.6 V VIN = 4.2 V VIN = 2.8 V 200 0 6.5 0 400m 800m 1.2 1.6 2 Load Current (A) G024 Figure 6. High Side FET On-Resistance vs Input Voltage 2.4 2.8 3.2 G009 Figure 7. Switching Frequency vs Load Current 2 25 1.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 Vo 20 mV/div Io 1 A/div Iinductor 500 mA/div VEN 2 V/div Vo 1 V/div Vin = 3.7 V Vo = 1.8 V f = 1.4 MHz, L = 1 µH Vin = 3.7 V Vo = 1.8 V/600 mA L = 1 µH Css = 10 nF Iinductor 50 mA/div 200 µs/div 400 µs/div G015 Figure 12. Load Sweep Vin = 3.7 V Vo = 1.8 V/no load L = 1 µH Io 2 A/div Iinductor 200 mA/div Iinductor 1 A/div 2 ms/div Vin = 3.7 V Vo = 1.8 V f = 1.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 www.ti.com DETAILED DESCRIPTION Operation The TLV62090 synchronous switched mode converter is based on DCS™ Control (Direct Control with Seamless transition into Power Save Mode). This is an advanced regulation topology that combines the advantages of hysteretic and voltage mode control. The DCS™ Control topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load conditions and in Power Save Mode at light load currents.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 Where RDS(on) = High side FET on-resistance RL = DC resistance of the inductor VOUT(max) = nominal output voltage plus maximum output voltage tolerance Softstart (SS) To minimize inrush current during start up, the device has an adjustable softstart depending on the capacitor value connected to the SS pin. The device charges the softstart capacitor with a constant current of typically 7.5 µA.
PAGE 12
TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 R4 = www.ti.com 1.25V 300μA (6) In the calculation of R4, 300 µA current is used to achieve sufficient accuracy by taking into account the typical 7.5 µA soft-start current. After determining R4, R3 can be calculated using Equation 5. Short Circuit Protection (Hiccup-Mode) The device is protected against hard short circuits to GND and over-current events. This is implemented by a two level short circuit protection.
PAGE 13
TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 APPLICATION INFORMATION DESIGN PROCEDURE The first step is the selection of the output filter components. To simplify this process, and Table 2 outline possible inductor and capacitor value combinations. Table 2. Output Filter Selection INDUCTOR VALUE [µH] (1) OUTPUT CAPACITOR VALUE [µF] (2) 10 0.47 22 47 100 150 √ √ √ √ 1.0 √ √ (3) √ √ √ 2.2 √ √ √ √ √ 3.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 www.ti.com Input and Output Capacitor Selection For best output and input voltage filtering, low ESR ceramic capacitors are recommended. The input capacitor minimizes input voltage ripple, suppresses input voltage spikes and provides a stable system rail for the device. A 22 µF or larger input capacitor is recommended. The output capacitor value can range from 10 µF up to 150 µF and beyond.
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TLV62090 www.ti.com SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 L1 1mH TLV62090 Vin 2.5V to 5.5V 12 11 C1 22mF 10 3 C3 10nF 13 7 8 PVIN SW PVIN SW AVIN VOS Vout 1.5V/3A 1 R1 140k 2 C2 22mF 16 DEF FB 5 EN PG 4 CP SS CN AGND 6 R2 160k R3 500k Power Good 9 C4 10nF PGND PGND 14 15 Figure 22. 1.5 V Adjustable Version L1 1uH TLV62090 Vin 2.5V to 5.5V 12 11 C1 22mF 10 3 C3 10nF 13 7 8 PVIN SW PVIN SW AVIN VOS Vout 1.
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TLV62090 SLVSBB9B – MARCH 2012 – REVISED APRIL 2012 www.ti.com L1 1mH TLV62090 Vin 2.5V to 5.5V 12 11 C1 22mF 10 3 C3 10nF 13 7 8 PVIN SW PVIN SW AVIN VOS Vout 1.05V/3A 1 R1 68k 2 C2 22mF 16 DEF FB 5 EN PG 4 CP SS CN AGND 6 R2 220k R3 500k Power Good 9 C4 10nF PGND PGND 14 15 Figure 24. 1.05 V Adjustable Version REVISION HISTORY Changes from Original (March 2012) to Revision A Page • Changed Vin From: 2.5V to 6V To: 2.5V to 5.5V in Figure 1 ..............................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Jun-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 TLV62090RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TLV62090RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 5-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TLV62090RGTR QFN RGT 16 3000 367.0 367.0 35.0 TLV62090RGTT QFN RGT 16 250 210.0 185.0 35.
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