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OUTPUT CURRENT (mA)

EFFICIENCY (%)

100

0.1 1 10 100 1000

= 3.6V

= 2.3V

= 4.2V

LM3691

www.ti.com

SNVS506I –MAY 2008–REVISED MAY 2013

LM3691 High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable

Applications

Check for Samples: LM3691

FEATURES

DESCRIPTION

The LM3691 step-down DC-DC converter is

• V

OUT

= 0.75V to 3.3V

optimized for powering ultra-low voltage circuits from

• ±1% DC Output Voltage Precision

a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It

• 2.3V ≤ V

≤ 5.5V

provides up to 1A load current, over an input voltage

range from 2.3V to 5.5V. There are several different

• 4 MHz Switching Frequency

fixed voltage output options available.

• 64 μA (typ.) Quiescent Current in ECO Mode

LM3691 has a mode-control pin that allows the user

• 1A Maximum Load Capability

to select Forced PWM mode or ECO mode that

• Automatic ECO/PWM Mode Switching

changes modes between gated PWM mode and

• Mode Pin to Select ECO/Forced PWM Mode

PWM automatically depending on the load. In ECO,

LM3691 offers superior efficiency and very low I

q• 1 μH Inductor, 4.7 μF Input Capacitor

under light load conditions. ECO mode extends the

(0603(1608) Case Size) and 4.7 μF Output

battery life through reduction of the quiescent current

Capacitor (0603(1608) Case Size)

during light load conditions and system standby.

• Current Overload and Thermal Shutdown

The LM3691 is available in a 6-bump DSBGA

Protections

package. Only three external surface-mount

• Only Three Tiny Surface-Mount External

components, a 1 μH inductor, a 4.7 μF input

Components Required (Solution Size Less

capacitor and a 4.7 μF output capacitor, are required.

Than 15 mm

)

APPLICATIONS

• Mobile Phones

• Hand-Held Radios

• MP3 Players

• Portable Hard Disk Drives

Typical Application Circuit

Figure 1. Typical Application Circuit Figure 2. Efficiency vs. Output Current

OUT

= 1.8V, ECO Mode)

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 (24 pages)

PAGE 1
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 LM3691 High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications Check for Samples: LM3691 FEATURES DESCRIPTION • • • • • • • • • The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
PAGE 2
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Connection Diagram Figure 3. 6-Bump Thin DSBGA Package, Large Bump See Package Number YZR0006LCA PIN DESCRIPTIONS Pin DSBGA Name Description A1 EN Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating. B1 MODE Mode Pin: Mode = 1, Forced PWM Mode = 0, ECO Do not leave this pin floating. C1 FB Feedback analog input.
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LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 Absolute Maximum Ratings (1) (2) −0.2V to 6.0V VIN Pin to GND EN, MODE, FB, SW pins (GND−0.2V) to VIN + 0.2V Junction Temperature (TJ-MAX) +150°C −65°C to +150°C Storage Temperature Range Continuous Power Dissipation (3) Internally Limited Maximum Lead Temperature (Soldering, 10 sec.
PAGE 4
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 Electrical Characteristics www.ti.com (1) (2) (3) Limits in standard typeface are for TA = 25°C. Limits in boldface type apply over the operating ambient temperature range (−30°C ≤ TA= TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3691 open loop Typical Application Circuit with VIN = EN = 3.6V. Parameter VFB Test Conditions Feedback Voltage Min Typ Max Units PWM Mode. No load VOUT = 1.1V to 3.3V -1 +1 % PWM Mode.
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LM3691 www.ti.
PAGE 6
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. 6 Quiescent Supply current vs. Supply Voltage No Switching (ECO Mode) Quiescent Supply current vs. Supply Voltage No Switching (PWM Mode) Figure 4. Figure 5. Shutdown Current vs. Temp (VOUT = 1.
PAGE 7
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. Output Voltage vs. Output Current (VOUT = 0.75V) Output Voltage vs. Output Current (VOUT = 1.8V) Figure 10. Figure 11. Input Current vs. Output Current (VOUT = 0.75V) Input Current vs.
PAGE 8
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. Efficiency vs. Output Current (VOUT = 2.5V, ECO Mode) Efficiency vs. Output Current (VOUT = 0.75V, FPWM Mode) 100 EFFICIENCY (%) 80 VIN = 4.2V 60 VIN = 3.6V 40 20 0 0.
PAGE 9
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. Output Voltage Ripple vs. Supply Voltage (VOUT = 0.75V) Output Voltage Ripple vs. Supply Voltage (VOUT = 1.8V) Figure 22. Figure 23. Closed Loop Current Limit vs. Temperature (VOUT = 0.
PAGE 10
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. 10 Load Transient Reponse (VOUT = 0.75V, ECO Mode 1mA to 25 mA) Load Transient Reponse (VOUT = 0.75V, ECO Mode 25 mA to 1mA) Figure 28. Figure 29. Load Transient Reponse (VOUT = 1.
PAGE 11
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. Load Transient Reponse (VOUT = 1.8V, ECO Mode to PWM Mode) Load Transient Reponse (VOUT = 2.5V, ECO Mode to PWM Mode) Figure 34. Figure 35. Load Transient Reponse (VOUT = 2.
PAGE 12
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) LM3691TL Typical Application Circuit (page 1), VIN = 3.6V, VOUT = 1.8V, TA = 25°, L = 1.0 μH, 2520, (LQM2HP1R0), CIN = COUT = 4.7 μF, 0603(1608), 6.3V, (C1608X5R0J475K) unless otherwise noted. Load Transient Reponse (VOUT = 2.5V, PWM Mode) Start Up into ECO Mode (VOUT = 0.75V, ROUT = 750Ω) Figure 40. Figure 41. Start Up into PWM Mode (VOUT = 0.75V, ROUT = 2.5Ω) Start Up into ECO Mode (VOUT = 1.
PAGE 13
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 OPERATION DESCRIPTION DEVICE INFORMATION The LM3691, a high-efficiency, step-down DC-DC switching buck converter, delivers a constant voltage from either a single Li-Ion or three cell NiMH/NiCd battery to portable devices such as cell phones and PDAs.
PAGE 14
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com Internal Synchronous Rectification While in PWM mode, the LM3691 uses an internal NFET as a synchronous rectifier to reduce rectifier forward voltage drop and associated power loss. Synchronous rectification provides a significant improvement in efficiency whenever the output voltage is relatively low compared to the voltage drop across an ordinary rectifier diode.
PAGE 15
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 THERMAL SHUTDOWN PROTECTION The LM3691 has a thermal overload protection function that operates to protect itself from short-term misuse and overload conditions. When the junction temperature exceeds around 150°C, the device inhibits operation. Both the PFET and the NFET are turned off. When the temperature drops below 130°C, normal operation resumes.
PAGE 16
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com The output voltage ripple is caused by the charging and discharging of the output capacitor and also due to its RESR and can be calculated as: Voltage peak-to-peak ripple due to capacitance = VPP-C = IRIPPLE 4*f*C (2) Voltage peak-to-peak ripple due to ESR = VPP-ESR = (2 * IRIPPLE) * RESR (3) Because these two components are out of phase the rms value can be used to get an approximate value of peak-to-peak ripple.
PAGE 17
LM3691 www.ti.com SNVS506I – MAY 2008 – REVISED MAY 2013 ground-plane noise by preventing the switching currents from circulating through the ground plane. It also reduces ground bounce at the buck by giving it a low-impedance ground connection. 5. Use wide traces between the power components and for power connections to the DC-DC converter circuit. This reduces voltage errors by resistive losses across the traces.
PAGE 18
LM3691 SNVS506I – MAY 2008 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision H (April 2013) to Revision I • 18 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 19
PACKAGE OPTION ADDENDUM www.ti.com 2-May-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (°C) Top-Side Markings (3) (4) LM3691TL-0.75/NOPB ACTIVE DSBGA YZR 6 250 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM LM3691TL-1.0/NOPB ACTIVE DSBGA YZR 6 250 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM LM3691TL-1.
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.com 2-May-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PAGE 21
PACKAGE MATERIALS INFORMATION www.ti.com 8-May-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) LM3691TL-0.75/NOPB DSBGA YZR 6 250 178.0 8.4 LM3691TL-1.0/NOPB DSBGA YZR 6 250 178.0 LM3691TL-1.2/NOPB DSBGA YZR 6 250 178.0 LM3691TL-1.5/NOPB DSBGA YZR 6 250 LM3691TL-1.8/NOPB DSBGA YZR 6 LM3691TL-2.5/NOPB DSBGA YZR LM3691TL-3.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3691TL-0.75/NOPB DSBGA YZR 6 250 210.0 185.0 35.0 LM3691TL-1.0/NOPB DSBGA YZR 6 250 210.0 185.0 35.0 LM3691TL-1.2/NOPB DSBGA YZR 6 250 210.0 185.0 35.0 LM3691TL-1.5/NOPB DSBGA YZR 6 250 210.0 185.0 35.0 LM3691TL-1.8/NOPB DSBGA YZR 6 250 210.0 185.0 35.0 LM3691TL-2.5/NOPB DSBGA YZR 6 250 210.
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MECHANICAL DATA YZR0006xxx D 0.600±0.075 E TLA06XXX (Rev C) D: Max = 1.59 mm, Min = 1.53 mm E: Max = 1.295 mm, Min =1.235 mm 4215044/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.
PAGE 24
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