Texas Instruments LM3671LC, LM3671LC-1.2, LM3671LC-1.3, LM3671LC-1.6, LM3671LC-1.8 Schematic [ru]

...

0 (0)

GND

L1: 2.2 PH

OUT

10 PF

4.7 PF

LM3671

2.7V to 5.5V

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SNVS294P –NOVEMBER 2004–REVISED MAY 2013

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

Check for Samples: LM3671, LM3671Q

FEATURES

• 16 µA Typical Quiescent Current

• 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

• Internal Soft start

• 0.01 µA Typical Shutdown Current

• Operates from a Single Li-Ion Cell Battery

• Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)

• Current Overload and Thermal Shutdown Protection

• Available in Fixed Output Voltages and Adjustable Version

• LM3671Q is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified

• SOT-23, 5-Bump DSBGA and 6-Pin USON Packages

APPLICATIONS

• Mobile Phones

• Digital Still Cameras

• Portable Hard Disk Drives

• Automotive

DESCRIPTION

The LM3671 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from

2.7V to 5.5V. It provides up to 600 mA load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version range from

1.1V to 3.3V. The device offers superior features and performance

for mobile phones and similar portable systems. Automatic intelligent switching between PWM lownoise 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.).

LM3671

LM3671Q

TYPICAL APPLICATION CIRCUITS

Figure 1. Typical Application Circuit

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.

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.

Top View Bottom View

GND

GND2EN

GND

L1: 2.2 PH

OUT

10 PF

4.7 PF

LM3671-

ADJ

2.7V to 5.5V

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

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.

Figure 2. Typical Application Circuit for ADJ version

Connection Diagrams

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Figure 3. Top View

SOT-23 Package

See Package Number DBV (2.92 mm x 2.84 mm x 1.2 mm)

Figure 4. 5-Bump DSBGA Package

See Package Number YZR0005 (1.05 mm x 1.38 mm x 0.6 mm)

Product Folder Links: LM3671 LM3671Q

3 4

Pgnd

Vin

Sgnd

TOP VIEW

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Pin # Name Description

LM3671

LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

Figure 5. 6-Pin USON Package

See Package Number NKH0006B (2 mm x 2 mm x 0.6 mm)

PIN DESCRIPTIONS (SOT-23)

1 V

2 GND Ground pin. 3 EN Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled

4 FB Feedback analog input. Connect directly to the output filter capacitor for fixed voltage

5 SW Switching node connection to the internal PFET switch and NFET synchronous rectifier.

Power supply input. Connect to the input filter capacitor (Figure 1).

when >1.0V. Do not leave this pin floating.

versions. For adjustable version external resistor dividers are required (Figure 2). The internal resistor dividers are disabled for the adjustable version.

PIN DESCRIPTIONS (5-Bump DSBGA)

Pin # Name Description

A1 V

Power supply input. Connect to the input filter capacitor (Figure 1). A3 GND Ground pin. C1 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. C3 FB Feedback analog input. Connect directly to the output filter capacitor for fixed voltage

versions. For adjustable version external resistor dividers are required (Figure 2). The

internal resistor dividers are disabled for the adjustable version. B2 SW Switching node connection to the internal PFET switch and NFET synchronous rectifier.

PIN DESCRIPTIONS (6-Pin USON)

Pin # Name Description

1 EN Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled

2 Pgnd Ground pin. 3 V

4 SW Switching node connection to the internal PFET switch and NFET synchronous rectifier. 5 Sgnd Singnal ground (feedback ground). 6 FB Feedback analog input. Connect directly to the output filter capacitor for fixed voltage

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.

when >1.0V. Do not leave this pin floating.

Power supply input. Connect to the input filter capacitor (Figure 1).

versions. For adjustable version external resistor dividers are required (Figure 2). The

internal resistor dividers are disabled for the adjustable version.

Product Folder Links: LM3671 LM3671Q

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

Orderable Voltage Option (V)

SOT-23 Package

LM3671MF-1.2

LM3671MFX-1.2

LM3671MF-1.2/NOPB

LM3671MFX-1.2/NOPB

LM3671QMF-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-1.875/NOPB

LM3671MFX-1.875/NOPB

LM3671MF-2.5/NOPB

LM3671MFX-2.5/NOPB

LM3671MF-2.8/NOPB

LM3671MFX-2.8/NOPB

LM3671MF-3.3/NOPB

LM3671MFX-3.3/NOPB

LM3671MF-ADJ/NOPB

LM3671MFX-ADJ/NOPB

(1) For the most current package and ordering information, see the Package Option Addendum at the end

of this document, or see the TI web site at www.ti.com.

(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

ORDERING INFORMATION

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(1)(2)

1.2

1.25

1.375

1.5

1.6

1.8

1.875

2.5

2.8

3.3

Adjustable

Product Folder Links: LM3671 LM3671Q

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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

LM3671TL-1.8/NOPB LM3671TLX-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-3.3/NOPB LM3671TLX-3.3/NOPB LM3671TL-ADJ/NOPB

LM3671TLX-ADJ/NOPB

USON Package

LM3671LC-1.2/NOPB

LM3671LCX-1.2/NOPB

LM3671LC-1.3/NOPB

LM3671LCX-1.3/NOPB

LM3671LC-1.6/NOPB

LM3671LCX-1.6/NOPB

LM3671LC-1.8/NOPB

LM3671LCX-1.8/NOPB

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

ORDERING INFORMATION

Orderable Voltage Option (V)

(1)(2)

(continued)

1.2

1.25

1.5

1.8

1.875

2.5

2.8

3.3

Adjustable

1.2

1.3

1.6

1.8

LM3671

LM3671Q

Product Folder Links: LM3671 LM3671Q

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

ABSOLUTE MAXIMUM RATINGS

(1)(2)

VINPin: Voltage to GND −0.2V to 6.0V FB, SW, EN Pin: (GND−0.2V) to

Continuous Power Dissipation Junction Temperature (T

(3)

) +125°C

J-MAX

Storage Temperature Range −65°C to +150°C Maximum Lead Temperature 260°C

(Soldering, 10 sec.)

ESD Rating

(4)

Human Body Model 2 kV Machine Model 200V

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under

which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics tables.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office / Distributors for

availability and specifications.

(3) Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ= 150°C (typ.) and

disengages at TJ= 130°C (typ.).

(4) The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF

capacitor discharged directly into each pin. MIL-STD-883 3015.7

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(VIN+ 0.2V)

Internally Limited

OPERATING RATINGS

Input Voltage Range

(3)

(1) (2)

2.7V to 5.5V Recommended Load Current 0mA to 600 mA Junction Temperature (TJ) Range −40°C to +125°C Ambient Temperature (TA) Range

(4)

−40°C to +85°C

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under

which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits

and associated test conditions, see the Electrical Characteristics tables. (2) All voltages are with respect to the potential at the GND pin. (3) The input voltage range recommended for ideal applications performance for the specified output voltages are given below:VIN= 2.7V to

4.5V for 1.1V ≤ V

DROPOUT

(4) In Applications where high power dissipation and/or poor package resistance is present, the maximum ambient temperature may have

= I

to be derated. Maximum ambient temperature (T

maximum power dissipation of the device in the application (P

in the application, as given by the following equation:T

different ambient temperatures.

< 1.5VVIN= 2.7V to 5.5V for 1.5V ≤ V

OUT

LOAD

*( R

DSON, PFET

+ R

INDUCTOR

< 1.8VVIN= (V

)

A-MAX

OUT

) is dependent on the maximum operating junction temperature (T

) and the junction to ambient thermal resistance of the package (θJA)

D-MAX

= T

A-MAX

J-MAX

− (θJAx P

+ V

OUT

). Refer to Dissipation rating table for P

D-MAX

DROPOUT

) to 5.5V for 1.8V ≤ V

≤ 3.3Vwhere

OUT

J-MAX

D-MAX

), the

values at

THERMAL PROPERTIES

Junction-to-Ambient Thermal Resistance (θJA) (SOT-23) for 4-layer board Junction-to-Ambient Thermal Resistance (θJA) (DSBGA) for 4-layer board Junction-to-Ambient Thermal Resistance (θJA) (USON) for 4-layer board

(1) Junction to ambient thermal resistance is highly application and board layout dependent. In applications where high power dissipation

exists, special care must be given to thermal dissipation issues in board design. Specified value of 130 °C/W for SOT-23 is based on a 4

layer, 4" x 3", 2/1/1/2 oz. Cu board as per JEDEC standards is used.

(1) (1)

(1)

130°C/W

85°C/W

165°C/W

Product Folder Links: LM3671 LM3671Q

LM3671

LM3671Q

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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 = 3.6V

Symbol Parameter Condition Min Typ Max Units

Input Voltage Feedback Voltage (Fixed) MF −4 +4 Feedback Voltage (Fixed) TL PWM mode Feedback Voltage (Fixed) LC −4 +4 Feedback Voltage (ADJ) MF

(6)

Feedback Voltage (ADJ) TL −2.5 +2.5 Line Regulation 0.031 %/V

Load Regulation 0.0013 %/mA

REF

SHDN

DSON (P)

DSON (N)

LIM

OSC

Internal Reference Voltage 0.5 V Shutdown Supply Current EN = 0V 0.01 1 µA

DC Bias Current into V

Pin-Pin Resistance for PFET VIN= VGS= 3.6V 380 500 mΩ Pin-Pin Resistance for NFET VIN= VGS= 3.6V 250 400 mΩ Switch Peak Current Limit Open Loop Logic High Input 1.0 V Logic Low Input 0.4 V Enable (EN) Input Current 0.01 1 µA Internal Oscillator Frequency PWM Mode

(1) All voltages are with respect to the potential at the GND pin. (2) Min and Max limits are specified by design, test or statistical analysis. Typical numbers are not specified, but do represent the most

likely norm. (3) The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input

voltage range refer to datasheet curves. (4) The input voltage range recommended for ideal applications performance for the specified output voltages are given below:VIN= 2.7V to

4.5V for 1.1V ≤ V

DROPOUT

(5) Test condition: for V

= I

(6) ADJ version is configured to 1.5V output. For ADJ output version: VIN= 2.7V to 4.5V for 0.90V ≤ V

≤ V

< 3.3V

OUT

(7) Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic

< 1.5VVIN= 2.7V to 5.5V for 1.5V ≤ V

OUT

LOAD

*( R

DSON, PFET

less than 2.5V, VIN= 3.6V; for V

OUT

+ R

INDUCTOR

)

table reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed

loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops

by 10%.

(4)

(5)

PWM mode

(5)

2.7V ≤ VIN≤ 5.5V IO= 10 mA

100 mA ≤ IO≤ 600 mA VIN= 3.6V

No load, device is not switching (FB forced higher than programmed 16 35 µA output voltage)

(7)

(5)

< 1.8VVIN= (V

OUT

greater than or equal to 2.5V, VIN= V

OUT

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

2.7 5.5 V

−2.5 +2.5 %

−4 +4

830 1020 1150 mA

1.6 2 2.6 MHz

+ V

DROPOUT

) to 5.5V for 1.8V ≤ V

+ 1V.

OUT

< 1.1VVIN= 2.7V to 5.5V for 1.1V

OUT

≤ 3.3Vwhere

OUT

DISSIPATION RATING TABLE

130°C/W (4 layer board) SOT-23 770 mW 500 mW 310 mW

85°C/W (4 layer board) 5-bump 1179 mW 765 mW 470 mW

DSBGA

165°C/W (4 layer board) 6-pin 606 mW 394 mW 242 mW

USON

TA≤ 25°C TA= 60°C TA= 85°C

Power Rating Power Rating Power Rating

Product Folder Links: LM3671 LM3671Q

2 MHz

Oscillator

Soft

Start

Ramp

Generator

Thermal

Shutdown

Undervoltage

Lockout

Frequency

Compensation

Error

Amp

Control Logic Driver

Current Limit

Comparator

Ref1

PFM Current

Comparator

Ref2

Zero Crossing

Comparator

PWM Comparator

pfm_low

pfm_hi

GND

Bandgap

Vcomp

1.0V

Fixed Ver

Adj Ver

0.5V

REF

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

BLOCK DIAGRAM

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Figure 6. Simplified Functional Diagram

Product Folder Links: LM3671 LM3671Q

-10 10 30 50 70 90 110 TEMPERATURE (oC)

100

150

200

250

300

350

400

450

500

550

600

DS(ON)

(m:)

-30

NFET

VIN = 4.5V

PFET

VIN = 2.7V

VIN = 4.5V

VIN = 3.6V

VIN = 2.7V

3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)

QUIESCENT CURRENT (P

)

2.5

TA = 85°C

EN = V

OUT

= 0 mA

TA = 25°C

TA = -30°C

-10 10 30 50 70 90 TEMPERATURE (°C)

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

SHUTDOWN CURRENT (PA)

-30

EN = GND

VIN = 3.6V

VIN = 2.7V

VIN = 5.5V

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SNVS294P –NOVEMBER 2004–REVISED MAY 2013

TYPICAL PERFORMANCE CHARACTERISTICS

LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, V

Quiescent Supply Current vs. Supply Voltage Shutdown Current vs. Temp

Figure 7. Figure 8.

Feedback Bias Current vs. Temp Switching Frequency vs. Temperature

= 1.5V, TA= 25°C, unless otherwise noted.

OUT

LM3671

LM3671Q

Figure 9. Figure 10.

vs. Temperature Open/Closed Loop Current Limit vs. Temperature

DS(ON)

Figure 11. Figure 12.

Product Folder Links: LM3671 LM3671Q

0 100 200 300 400 500 600

OUTPUT CURRENT (mA)

1.48

1.5

1.52

1.54

OUTPUT VOLTAGE (V)

VIN = 3.6V V

OUT

= 1.5V

PFM Mode

PWM Mode

-10 10 30 50 70 90 TEMPERATURE (oC)

1.4800

1.4850

1.4900

1.4950

1.5000

1.5050

1.5100

1.5150

1.5200

1.5250

1.5300

OUTPUT VOLTAGE (V)

-30

PFM Mode

PWM Mode

OUT

= 300 mA

VIN = 3.6V V

OUT

= 1.5V

OUT

= 600 mA

OUT

= 10 mA

2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE(V)

1.4800

1.4900

1.5000

1.5100

1.5200

1.5300

= 10 mAI

OUT

= 1.5 V

OUT

= 300 mA

OUT

= 500 mA

OUT

= 600 mA

OUT

OUTPUT VOLTAGE (V)

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, V

Output Voltage vs. Supply Voltage Output Voltage vs. Supply Voltage

= 1.5V) (V

OUT

Figure 13. Figure 14.

= 1.5V, TA= 25°C, unless otherwise noted.

OUT

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= 2.5V)

Output Voltage vs. Temperature Output Voltage vs. Temperature

= 1.5V) (V

OUT

= 2.5V)

Figure 15. Figure 16.

Output Voltage vs. Output Current Output Voltage vs. Output Current

= 1.5V) (V

OUT

= 2.5V)

Figure 17. Figure 18.

Product Folder Links: LM3671 LM3671Q

OUT

40 Ps/DIV

3.6V

3.0V

20 mV/DIV AC Coupled

OUT

= 1.5V

OUT

= 400 mA

0.10 1.00 10.00 100.00 1000.00 OUTPUT CURRENT (mA)

100

EFFICIENCY (%)

0.01

VIN = 2.7V

VIN = 4.5V

VIN = 3.6V

OUT

= 1.5V

0.10 1.00 10.00 100.00 1000.00 OUTPUT CURRENT (mA)

100

EFFICIENCY (%)

0.01

VIN = 3.0V

VIN = 4.5V

VIN = 3.6V

OUT

= 1.8V

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, V

Efficiency vs. Output Current Efficiency vs. Output Current

= 1.5V, L= 2.2 µH) (V

OUT

Figure 19. Figure 20.

Efficiency vs. Output Current Efficiency vs. Output Current

= 2.5V, L= 2.2 µH) (V

OUT

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

= 1.5V, TA= 25°C, unless otherwise noted.

OUT

LM3671

LM3671Q

= 1.8V, L= 2.2 µH)

= 3.3V, L= 2.2 µH)

Figure 21. Figure 22.

Line Transient Response Line Transient Response V

= 1.5V (PWM Mode) V

OUT

Figure 23. Figure 24.

Product Folder Links: LM3671 LM3671Q

= 2.5V (PWM Mode)

OUT

LM3671 LM3671Q

SNVS294P –NOVEMBER 2004–REVISED MAY 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

LM3671MF/TL/LC, Circuit of Figure 1, VIN= 3.6V, V

Load Transient Response Load Transient Response

= 1.5V (PWM Mode) V

OUT

Figure 25. Figure 26.

= 1.5V, TA= 25°C, unless otherwise noted.

OUT

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= 2.5V (PWM Mode)

Load Transient Response (V

(PFM Mode 0.5 mA to 50 mA) (PFM Mode 50 mA to 0.5 mA)

Figure 27. Figure 28.

Load Transient Response (V

(PFM Mode 0.5 mA to 50 mA) (PFM Mode 50 mA to 0.5 mA)

= 1.5V) Load Transient Response (V

OUT

= 2.5V) Load Transient Response (V

OUT

= 1.5V)

= 2.5V)

Figure 29. Figure 30.

Product Folder Links: LM3671 LM3671Q

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