Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder TO 263 7

Voltage

5V/5A

Boost

6TQ045S

Voltage

8V to 40V

Input

LM2677 - 5.0

Output

Switch

Output

0.01 PF

0.47 PF

3 x 15 PF/50V

Optional External

Sync Clock

(280 kHz to 400 kHz)

100 pF

1 k:

+ + +

2 x 180 PF, 16V

22 PH

Feedback

Ground

LM2677

www.ti.com

SNVS077I –MAY 2004–REVISED JUNE 2012

LM2677 SIMPLE SWITCHER® High Efficiency 5A Step-Down Voltage Regulator with Sync

Check for Samples: LM2677

FEATURES

DESCRIPTION

The LM2677 series of regulators are monolithic

• Efficiency up to 92%

integrated circuits which provide all of the active

• Simple and Easy to Design with (Using Off-the-

functions for a step-down (buck) switching regulator

shelf External Components)

capable of driving up to 5A loads with excellent line

• 100 mΩ DMOS Output Switch

and load regulation characteristics. High efficiency

(>90%) is obtained through the use of a low ON-

• 3.3V, 5V and 12V Fixed Output and Adjustable

resistance DMOS power switch. The series consists

(1.2V to 37V ) Versions

of fixed output voltages of 3.3V, 5V and 12V and an

• 50μA Standby Current when Switched OFF

adjustable output version.

• ±2%maximum Output Tolerance Over Full Line

The SIMPLE SWITCHER™ concept provides for a

and Load Conditions

complete design using a minimum number of external

• Wide Input Voltage Range: 8V to 40V

components. The switching clock frequency can be

provided by an internal fixed frequency oscillator

• External Sync Clock Capability (280KHz to

(260KHz) or from an externally provided clock in the

400KHz)

range of 280KHz to 400Khz which allows the use of

• 260 KHz Fixed Frequency Internal Oscillator

physically smaller sized components. A family of

• −40 to +125°C Operating Junction Temperature

standard inductors for use with the LM2677 are

Range

available from several manufacturers to greatly

simplify the design process. The external Sync clock

provides direct and precise control of the output ripple

APPLICATIONS

frequency for consistent filtering or frequency

• Simple to Design, High Efficiency (>90%) Step-

spectrum positioning.

down Switching Regulators

The LM2677 series also has built in thermal

• Efficient System Pre-regulator for Linear

shutdown, current limiting and an ON/OFF control

Voltage Regulators

input that can power down the regulator to a low

• Battery Chargers

50μA quiescent current standby condition. The output

voltage is ensured to a ±2% tolerance.

• Communications and Radio Equipment

Regulator with Synchronized Clock Frequency

Typical Application

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.

2SIMPLE SWITCHER is a trademark 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 (34 pages)

PAGE 1
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 LM2677 SIMPLE SWITCHER® High Efficiency 5A Step-Down Voltage Regulator with Sync Check for Samples: LM2677 FEATURES DESCRIPTION • • The LM2677 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics.
PAGE 2
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Connection Diagrams and Ordering Information Figure 1. DDPAK/TO-263 Package - Top View See Package Number KTW0007B Figure 2. TO-220 Package - Top View See Package Number NDZ0007B VSW * 1 14 VIN 2 13 VSW 12 VSW 11 * VIN 3 CB 4 DAP** * 5 10 * SYNC 6 9 GND FB 7 8 ON/OFF * No Connections ** Connect to Pin 9 on PCB Figure 3.
PAGE 3
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Absolute Maximum Ratings (1) (2) Input Supply Voltage 45V ON/OFF Pin Voltage −0.1V to 6V Switch Voltage to Ground (3) −1V to VIN Boost Pin Voltage VSW + 8V −0.
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com LM2677-ADJ Electrical Characteristics Symbol Parameter Conditions VFB Feedback Voltage VIN = 8V to 40V, 100mA ≤ IOUT ≤ 5A VOUT Programmed for 5V η Efficiency VIN = 12V, ILOAD = 5A (1) (2) Typ (1) Min (2) Max (2) Units 1.21 1.186 1.174 1.234 1.246 V 84 % Typical values are determined with TA = TJ = 25°C and represent the most likely norm.
PAGE 5
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 All Output Voltage Versions Electrical Characteristics (continued) Limits appearing in bold type face apply over the entire junction temperature range of operation, −40°C to 125°C. Specifications appearing in normal type apply for TA = TJ = 25°C. Unless otherwise specified VIN=12V for the 3.3V, 5V and Adjustable versions and VIN=24V for the 12V version, Sync pin open circuited..
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Typical Performance Characteristics 6 Normalized Output Voltage Line Regulation Figure 4. Figure 5. Efficiency vs Input Voltage Efficiency vs ILOAD Figure 6. Figure 7. Switch Current Limit Operating Quiescent Current Figure 8. Figure 9.
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LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Typical Performance Characteristics (continued) Standby Quiescent Current ON/OFF Threshold Voltage Figure 10. Figure 11. ON/OFF Pin Current (Sourcing) Switching Frequency Figure 12. Figure 13. Feedback Pin Bias Current Continuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 5A L = 10 μH, COUT = 400 μF, COUTESR = 13 mΩ Figure 14. A: VSW Pin Voltage, 10 V/div.
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Typical Performance Characteristics (continued) Discontinuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 500 mA L = 10 μH, COUT = 400 μF, COUTESR = 13 mΩ A: VSW Pin Voltage, 10 V/div. B: Inductor Current, 1 A/div C: Output Ripple Voltage, 20 mV/div AC-Coupled Figure 16.
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LM2677 www.ti.
PAGE 10
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com APPLICATION HINTS The LM2677 provides all of the active functions required for a step-down (buck) switching regulator. The internal power switch is a DMOS power MOSFET to provide power supply designs with high current capability, up to 5A, and highly efficient operation. The LM2677 is part of the SIMPLE SWITCHER family of power converters.
PAGE 11
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 FEEDBACK This is the input to a two-stage high gain amplifier, which drives the PWM controller. It is necessary to connect pin 6 to the actual output of the power supply to set the dc output voltage. For the fixed output devices (3.3V, 5V and 12V outputs), a direct wire connection to the output is all that is required as internal gain setting resistors are provided inside the LM2677.
PAGE 12
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Power supply design using the LM2677 is greatly simplified by using recommended external components. A wide range of inductors, capacitors and Schottky diodes from several manufacturers have been evaluated for use in designs that cover the full range of capabilities (input voltage, output voltage and load current) of the LM2677.
PAGE 13
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 The RMS current and working voltage (WV) ratings of the output capacitor are also important considerations. In a typical step-down switching regulator, the inductor ripple current (set to be no more than 30% of the maximum load current by the inductor selection) is the current that flows through the output capacitor. The capacitor RMS current rating must be greater than this ripple current.
PAGE 14
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Under current limiting conditions, the LM267x is designed to respond in the following manner: 1. At the moment when the inductor current reaches the current limit threshold, the ON-pulse is immediately terminated. This happens for any application condition. 2. However, the current limit block is also designed to momentarily reduce the duty cycle to below 50% to avoid subharmonic oscillations, which could cause the inductor to saturate. 3.
PAGE 15
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Step 1: Operating conditions are: Vout = 3.3V Vin max = 16V Iload max = 2.5A Step 2: Select an LM2677T-3.3. The output voltage will have a tolerance of ±2% at room temperature and ±3% over the full operating temperature range. Step 3: Use the nomograph for the 3.3V device, Figure 21. The intersection of the 16V horizontal line (Vin max) and the 2.5A vertical line (Iload max) indicates that L33, a 22μH inductor, is required.
PAGE 16
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 • www.ti.com VFB is the feedback voltage of typically 1.21V A recommended value to use for R1 is 1K. In this example then R2 is determined to be: R2 = 11.23KΩ The closest standard 1% tolerance value to use is 11.3KΩ This will set the nominal output voltage to 14.88V which is within 0.5% of the target value.
PAGE 17
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Step 3: To use the nomograph for the adjustable device, Figure 24, requires a calculation of the inductor Volt•microsecond constant (E•T expressed in V•μS) from the following formula: where • VSAT is the voltage drop across the internal power switch which is Rds(ON) times Iload In this example this would be typically 0.15Ω x 2A or 0.3V and VD is the voltage drop across the forward bisased Schottky diode, typically 0.5V.
PAGE 18
LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Inductor Selection Guides For Continuous Mode Operation Figure 21. LM2677-3.3 Figure 22. LM2677-5.0 Figure 23. LM2677-12 Figure 24. LM2677-ADJ Table 1. Inductor Manufacturer Part Numbers (1) Inductor Reference Number Inductance (µH) Current (A) L23 33 L24 22 L25 L29 L30 (1) 18 Renco Pulse Engineering Through Hole Surface Mount Coilcraft Through Hole Surface Mount 1.35 RL-5471-7 RL1500-33 PE-53823 PE-53823S DO3316-333 1.
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LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Table 2.
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Table 4. Input and Output Capacitor Codes (continued)(1) (continued) Through Hole Capacitor Reference Code Sanyo OS-CON SA Series Sanyo MV-GX Series Panasonic HFQ Series C (µF) WV (V) Irms (A) C (µF) WV (V) Irms (A) C (µF) WV (V) Irms (A) C11 220 63 0.76 470 16 0.77 220 50 0.92 C12 470 63 1.2 680 16 1.02 470 50 1.44 C13 680 63 1.5 820 16 1.22 560 50 1.68 C14 1000 63 1.75 1800 16 1.88 1200 50 2.
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LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Table 6. Output Capacitors for Fixed Output Voltage Application(1) (continued) Surface Mount Output Voltage (V) Inductance (µH) AVX TPS Series No. 5 12 (2) Sprague 594D Series C Code (3) No. (2) C Code Kemet T495 Series (3) No.
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Table 7. Input Capacitors for Fixed Output Voltage Application (1) Surface Mount Output Voltage (V) Inductance (µH) AVX TPS Series (2) No. 3.3 5 12 (1) (2) (3) (4) (3) C Code Sprague 594D Series (4) No. (3) C Code Kemet T495 Series (4) No.
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LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Table 8. Schottky Diode Selection Table Reverse Voltage (V) Surface Mount 3A Through Hole 5A or More 20V SK32 30V SK33 3A 5A or More 1N5820 SR302 MBRD835L 30WQ03F 40V 1N5821 31DQ03 SK34 MBRB1545CT 1N5822 30BQ040 6TQ045S MBR340 MBR745 30WQ04F 31DQ04 80SQ045 MBRS340 SR403 6TQ045 MBRD340 50V or More SK35 MBR350 30WQ05F 31DQ05 SR305 Table 9.
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LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com Table 10. Output Capacitors for Adjustable Output Voltage Applications (continued) Surface Mount Output Voltage (V) Inductance (µH) AVX TPS Series No. 7.5 to 10 (1) Sprague 594D Series C Code (2) No. (1) C Code Kemet T495 Series (2) No.
PAGE 25
LM2677 www.ti.com SNVS077I – MAY 2004 – REVISED JUNE 2012 Output Capacitors for Adjustable Output Voltage Applications (continued) (continued) Through Hole Output Voltage (V) Inductance (µH) Sanyo OS-CON SA Series No. 6.25 to 7.5 7.5 to 10 10 to 12.5 12.5 to 15 15 to 20 (1) C Code 30 to 37 Sanyo MV-GX Series No. (1) C Code (2) Nichicon PL Series No. (1) C Code (2) Panasonic HFQ Series No.
PAGE 26
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2677S-12/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2677S -12 LM2677S-3.3 NRND DDPAK/ TO-263 KTW 7 45 TBD Call TI Call TI -40 to 125 LM2677S -3.3 LM2677S-3.
PAGE 27
PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2677SX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTW 7 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2677S -5.
PAGE 28
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-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 LM2677SD-12 VSON NHM 14 250 178.0 16.4 5.3 6.3 1.5 12.0 16.0 Q1 LM2677SD-12/NOPB VSON NHM 14 250 178.0 16.4 5.3 6.3 1.5 12.0 16.0 Q1 LM2677SD-3.3/NOPB VSON NHM 14 250 178.0 16.4 5.3 6.3 1.5 12.0 16.0 Q1 LM2677SD-5.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2677SD-12 VSON NHM 14 250 210.0 185.0 35.0 LM2677SD-12/NOPB VSON NHM 14 250 210.0 185.0 35.0 LM2677SD-3.3/NOPB VSON NHM 14 250 210.0 185.0 35.0 LM2677SD-5.0/NOPB VSON NHM 14 250 210.0 185.0 35.0 LM2677SD-ADJ VSON NHM 14 250 210.0 185.0 35.0 LM2677SD-ADJ/NOPB VSON NHM 14 250 210.0 185.0 35.
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MECHANICAL DATA NDZ0007B TA07B (Rev E) www.ti.
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MECHANICAL DATA NHM0014A SRC14A (Rev A) www.ti.
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MECHANICAL DATA KTW0007B TS7B (Rev E) BOTTOM SIDE OF PACKAGE www.ti.
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