Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder SOT 23 5

GND

L1: 2.2 PH

OUT

10 PF

4.7 PF

LM3671

2.7V to 5.5V

LM3671

LM3671Q

www.ti.com

SNVS294Q –NOVEMBER 2004–REVISED NOVEMBER 2013

LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter

Check for Samples: LM3671, LM3671Q

FEATURES

APPLICATIONS

• 16 µA Typical Quiescent Current

• Mobile Phones

• 600 mA Maximum Load Capability • PDAs

• 2 MHz PWM Fixed Switching Frequency (typ.) • MP3 Players

• Automatic PFM/PWM Mode Switching • W-LAN

• Internal Synchronous Rectification for High • Portable Instruments

Efficiency

• Digital Still Cameras

• Internal Soft Start

• Portable Hard Disk Drives

• 0.01 µA Typical Shutdown Current

• Automotive

• Operates from a Single Li-Ion Cell Battery

DESCRIPTION

• Only Three Tiny Surface-Mount External

The LM3671 step-down DC-DC converter is

Components Required (One Inductor, Two

optimized for powering low voltage circuits from a

Ceramic Capacitors)

single Li-Ion cell battery and input voltage rails from

• Current Overload and Thermal Shutdown

2.7V to 5.5V. It provides up to 600 mA load current,

Protection

over the entire input voltage range. There are several

• Available in Fixed Output Voltages and

different fixed voltage output options available as well

Adjustable Version

as an adjustable output voltage version range from

1.1V to 3.3V.

• LM3671Q is an Automotive Grade Product that

is AEC-Q100 Grade 1 Qualified

The device offers superior features and performance

for mobile phones and similar portable systems.

• SOT-23, 5-Bump DSBGA and 6-Pin USON

Automatic intelligent switching between PWM low-

Packages

noise and PFM low-current mode offers improved

system control. During PWM mode, the device

operates at a fixed-frequency of 2 MHz (typ.).

Hysteretic PFM mode extends the battery life by

reducing the quiescent current to 16 µA (typ.) during

light load and standby operation. Internal

synchronous rectification provides high efficiency

during PWM mode operation. In shutdown mode, the

device turns off and reduces battery consumption to

0.01 µA (typ.).

TYPICAL APPLICATION CIRCUITS

Figure 1. Typical Application Circuit

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 (38 pages)

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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 LM3671, LM3671Q 2MHz, 600mA Step-Down DC-DC Converter Check for Samples: LM3671, LM3671Q FEATURES APPLICATIONS • • • • • • • • • • • • • 1 2 • • • • • • • • 16 µA Typical Quiescent Current 600 mA Maximum Load Capability 2 MHz PWM Fixed Switching Frequency (typ.) Automatic PFM/PWM Mode Switching Internal Synchronous Rectification for High Efficiency Internal Soft Start 0.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com DESCRIPTION (CONTINUED) The LM3671 is available in SOT-23, tiny 5-bump DSBGA, and a 6-pin USON packages in leaded (PB) and leadfree (NO PB) versions. A high-switching frequency of 2 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. VIN L1: 2.2 PH VIN 2.7V to 5.5V CIN 4.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 6 Fb En 1 Pgnd 2 5 Sgnd Vin 3 4 Sw TOP VIEW Figure 5. 6-Pin USON Package See Package Number NKH0006B (2 mm x 2 mm x 0.6 mm) PIN DESCRIPTIONS (SOT-23) Pin # Name 1 VIN Description 2 GND 3 EN Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.0V. Do not leave this pin floating. 4 FB Feedback analog input.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com ORDERING INFORMATION (1) (2) Orderable Voltage Option (V) SOT-23 Package LM3671MF-1.2 LM3671MFX-1.2 LM3671MF-1.2/NOPB LM3671MFX-1.2/NOPB LM3671QMF-1.2 1.2 LM3671QMFX-1.2 LM3671QMF-1.2/NOPB LM3671QMFX-1.2/NOPB LM3671MF-1.25/NOPB LM3671MFX-1.25/NOPB LM3671MF-1.375/NOPB LM3671MFX-1.375/NOPB LM3671MF-1.5/NOPB LM3671MFX-1.5/NOPB LM3671MF-1.6/NOPB LM3671MFX-1.6/NOPB LM3671MF-1.8/NOPB LM3671MFX-1.8/NOPB LM3671MF-1.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 ORDERING INFORMATION(1)(2) (continued) Orderable Voltage Option (V) DSBGA Package LM3671TL-1.2/NOPB LM3671TLX-1.2/NOPB LM3671TL-1.25/NOPB LM3671TLX-1.25/NOPB LM3671TL-1.5/NOPB LM3671TLX-1.5/NOPB 1.2 1.25 1.5 LM3671TL-1.8/NOPB LM3671TLX-1.8/NOPB LM3671QTL-1.8/NOPB 1.8 LM3671QTLX-1.8/NOPB LM3671TL-1.875/NOPB LM3671TLX-1.875/NOPB LM3671TL-2.5/NOPB LM3671TLX-2.5/NOPB LM3671TL-2.8/NOPB LM3671TLX-2.8/NOPB LM3671TL-3.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) (2) −0.2V to 6.0V VIN Pin: Voltage to GND FB, SW, EN Pin: (GND−0.2V) to (VIN + 0.2V) Continuous Power Dissipation (3) Internally Limited Junction Temperature (TJ-MAX) +125°C Storage Temperature Range −65°C to +150°C Maximum Lead Temperature (Soldering, 10 sec.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 ELECTRICAL CHARACTERISTICS (1) (2) (3) Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the entire junction temperature range for operation, −40°C to +125°C. Unless otherwise noted, specifications apply to the LM3671MF/TL/LC with VIN = EN = 3.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com BLOCK DIAGRAM VIN EN SW Current Limit Comparator Undervoltage Lockout Ramp Generator Soft Start + - Ref1 PFM Current Comparator Thermal Shutdown + - 2 MHz Oscillator Bandgap Ref2 PWM Comparator Error Amp + Control Logic Driver - pfm_low VREF 0.5V + - pfm_hi Vcomp 1.0V + - + Zero Crossing Comparator Frequency Compensation Adj Ver Fixed Ver FB GND Figure 6.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. Quiescent Supply Current vs. Supply Voltage Shutdown Current vs. Temp 0.40 EN = VIN EN = GND IOUT = 0 mA TA = 85°C 0.35 SHUTDOWN CURRENT (PA) QUIESCENT CURRENT (PA) 20 18 TA = 25°C 16 TA = -30°C 14 12 0.30 0.25 0.20 VIN = 5.5V 0.15 VIN = 3.6V 0.10 VIN = 2.7V 0.05 10 2.5 3.0 3.5 4.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. Output Voltage vs. Supply Voltage (VOUT = 1.5V) 1.5300 Output Voltage vs. Supply Voltage (VOUT = 2.5V) V OUT = 1.5 V OUTPUT VOLTAGE (V) I OUT = 10 mA 1.5200 1.5100 I OUT = 300 mA 1.5000 I OUT = 500 mA 1.4900 I OUT = 600 mA 1.4800 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE(V) 1.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. Efficiency vs. Output Current (VOUT = 1.5V, L= 2.2 µH) 100 Efficiency vs. Output Current (VOUT = 1.8V, L= 2.2 µH) 100 VOUT = 1.5V VIN = 2.7V 90 80 VIN = 2.7V 70 VIN = 4.5V 60 VIN = 3.6V 50 EFFICIENCY (%) EFFICIENCY (%) 80 30 10.00 100.00 1000.00 VIN = 3.6V 50 30 1.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. 12 Load Transient Response VOUT = 1.5V (PWM Mode) Load Transient Response VOUT = 2.5V (PWM Mode) Figure 25. Figure 26. Load Transient Response (VOUT = 1.5V) (PFM Mode 0.5 mA to 50 mA) Load Transient Response (VOUT = 1.5V) (PFM Mode 50 mA to 0.5 mA) Figure 27. Figure 28.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. Mode Change by Load Transients VOUT = 1.5V (PFM to PWM) Mode Change by Load Transients VOUT = 1.5V (PWM to PFM) Figure 31. Figure 32. Mode Change by Load Transients VOUT = 2.5V (PFM to PWM) Mode Change by Load Transients VOUT = 2.5V (PWM to PFM) Figure 33. Figure 34.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.5V, TA= 25°C, unless otherwise noted. Start Up into PFM Mode VOUT = 1.5V (Output Current= 1mA) 2V/DIV VSW VOUT Start Up into PFM Mode VOUT = 2.5V (Output Current= 1mA) 500 mV/DIV VIN = 3.6V VOUT = 1.5V IOUT = 1 mA 2V/DIV EN TIME (100 Ps/DIV) Figure 37. 14 Figure 38.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 OPERATION DESCRIPTION Device Information The LM3671, a high-efficiency step-down DC-DC switching buck converter, delivers a constant voltage from a single Li-Ion battery and input voltage rails from 2.7V to 5.5V to portable devices such as cell phones and PDAs.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com VSW 2V/DIV IL 200 mA/DIV VIN = 3.6V VOUT = 1.5V IOUT = 400 mA VOUT 10 mV/DIV AC Coupled TIME (200 ns/DIV) Figure 39. Typical PWM Operation Internal Synchronous Rectification While in PWM mode, the LM3671 uses an internal NFET as a synchronous rectifier to reduce rectifier forward voltage drop and associated power loss.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 During PFM operation, the converter positions the output voltage slightly higher than the nominal output voltage during PWM operation, allowing additional headroom for voltage drop during a load transient from light to heavy load. The PFM comparators sense the output voltage via the feedback pin and control the switching of the output FETs such that the output voltage ramps between ~0.6% and ~1.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com LDO - Low Dropout Operation The LM3671-ADJ can operate at 100% duty cycle (no switching; PMOS switch completely on) for low dropout support of the output voltage. In this way the output voltage will be controlled down to the lowest possible input voltage. When the device operates near 100% duty cycle, output voltage ripple is approximately 25 mV.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 APPLICATION INFORMATION Output Voltage Selection for LM3671-ADJ The output voltage of the adjustable parts can be programmed through the resistor network connected from VOUT to FB, then to GND. VOUT is adjusted to make the voltage at FB equal to 0.5V.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com Inductor Selection There are two main considerations when choosing an inductor; the inductor should not saturate, and the inductor current ripple should be small enough to achieve the desired output voltage ripple. Different saturation current rating specifications are followed by different manufacturers so attention must be given to details. Saturation current ratings are typically specified at 25°C.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 Table 2. Suggested Inductors and Their Suppliers Model Vendor Dimensions LxWxH(mm) D.C.R (max) DO3314-222MX Coilcraft 3.3 x 3.3 x 1.4 200 mΩ LPO3310-222MX Coilcraft 3.3 x 3.3 x 1.0 150 mΩ ELL5GM2R2N Panasonic 5.2 x 5.2 x 1.5 53 mΩ CDRH2D14NP-2R2NC Sumida 3.2 x 3.2 x 1.55 94 mΩ Output Capacitor Selection A ceramic output capacitor of 10 µF, 6.3V is sufficient for most applications.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com DSBGA Package Assembly and Use Use of the DSBGA package requires specialized board layout, precision mounting and careful re-flow techniques, as detailed in Texas Instruments Application Note AN-1112 (Literature Number SNVA009). Refer to the section "Surface Mount Technology (DSBGA) Assembly Considerations". For best results in assembly, alignment ordinals on the PC board should be used to facilitate placement of the device.
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LM3671 LM3671Q www.ti.com SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 In mobile phones, for example, a common practice is to place the DC-DC converter on one corner of the board, arrange the CMOS digital circuitry around it (since this also generates noise), and then place sensitive preamplifiers and IF stages on the diagonally opposing corner. Often, the sensitive circuitry is shielded with a metal pan and power to it is post-regulated to reduce conducted noise, using low-dropout linear regulators.
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LM3671 LM3671Q SNVS294Q – NOVEMBER 2004 – REVISED NOVEMBER 2013 www.ti.com REVISION HISTORY Changes from Revision P (May 2013) to Revision Q • Added LM3671QTL/X-1.8/NOPB to Ordering Table ............................................................................................................. 4 Changes from Revision O (April 2013) to Revision P • 24 Page Page Changed layout of National Data Sheet to TI format .......................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 17-May-2014 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) LM3671LC-1.2/NOPB ACTIVE USON NKH 6 1000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM S39 LM3671LC-1.3/NOPB ACTIVE USON NKH 6 1000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM S40 LM3671LC-1.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 17-May-2014 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) LM3671MF-2.8 NRND SOT-23 DBV 5 1000 TBD Call TI Call TI -30 to 85 SJSB LM3671MF-2.8/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -30 to 85 SJSB LM3671MF-3.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 17-May-2014 Status (1) (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) LM3671QTLX-1.8/NOPB ACTIVE DSBGA YZR 5 3000 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM -40 to 125 9 LM3671TL-1.2/NOPB ACTIVE DSBGA YZR 5 250 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM -30 to 85 C LM3671TL-1.
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PACKAGE OPTION ADDENDUM www.ti.com 17-May-2014 ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-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 LM3671LC-1.2/NOPB USON NKH 6 1000 178.0 12.4 2.2 2.2 1.0 8.0 12.0 Q1 LM3671LC-1.3/NOPB USON NKH 6 1000 178.0 12.4 2.2 2.2 1.0 8.0 12.0 Q1 LM3671LC-1.6/NOPB USON NKH 6 1000 178.0 12.4 2.2 2.2 1.0 8.0 12.0 Q1 LM3671LC-1.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2013 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 LM3671MF-2.8 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM3671MF-2.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM3671MF-3.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM3671MF-ADJ/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3671LC-1.2/NOPB USON NKH 6 1000 210.0 185.0 35.0 LM3671LC-1.3/NOPB USON NKH 6 1000 210.0 185.0 35.0 LM3671LC-1.6/NOPB USON NKH 6 1000 210.0 185.0 35.0 LM3671LC-1.8/NOPB USON NKH 6 1000 210.0 185.0 35.0 LM3671LCX-1.2/NOPB USON NKH 6 4500 367.0 367.0 35.0 LM3671LCX-1.3/NOPB USON NKH 6 4500 367.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3671MF-3.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3671MF-ADJ/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3671MFX-1.2/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3671MFX-1.25/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3671MFX-1.375/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3671MFX-1.5/NOPB SOT-23 DBV 5 3000 210.0 185.
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MECHANICAL DATA NKH0006B LCA06B (Rev A) www.ti.
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MECHANICAL DATA YZR0005xxx D 0.600±0.075 E TLA05XXX (Rev C) D: Max = 1.413 mm, Min =1.352 mm E: Max = 1.083 mm, Min =1.022 mm 4215043/A NOTES: A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994. B. This drawing is subject to change without notice. www.ti.
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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.