Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - voltage regulators - DC DC switch controllers SIMPLE SWITCHER® HTSSOP 14

LM3151, LM3152, LM3153

www.ti.com

SNVS562G –SEPTEMBER 2008–REVISED MARCH 2011

LM3151/LM3152/LM3153 SIMPLE SWITCHER

CONTROLLER, High Input Voltage

Synchronous Step-Down

Check for Samples: LM3151, LM3152, LM3153

FEATURES

DESCRIPTION

The LM3151/2/3 SIMPLE SWITCHER Controller is an

234

• PowerWise™ Step-down Controller

easy to use and simplified step down power controller

• 6V to 42V Wide Input Voltage Range

capable of providing up to 12A of output current in a

• Fixed Output Voltage of 3.3V

typical application. Operating with an input voltage

range from 6V-42V, the LM3151/2/3 features a fixed

• Fixed Switching Frequencies of 250 kHz/500

output voltage of 3.3V, and features switching

kHz/750 kHz

frequencies of 250 kHz, 500 kHz, and 750 kHz. The

• No Loop Compensation Required

synchronous architecture provides for highly efficient

• Fully WEBENCH

Enabled

designs. The LM3151/2/3 controller employs a

Constant On-Time (COT) architecture with a

• Low External Component Count

proprietary Emulated Ripple Mode (ERM) control that

• Constant On-Time Control

allows for the use of low ESR output capacitors,

• Ultra-Fast Transient Response

which reduces overall solution size and output

voltage ripple. The Constant On-Time (COT)

• Stable with Low ESR Capacitors

regulation architecture allows for fast transient

• Output Voltage Pre-bias Startup

response and requires no loop compensation, which

• Valley Current Limit

reduces external component count and reduces

design complexity.

• Programmable Soft-start

Fault protection features such as thermal shutdown,

TYPICAL APPLICATIONS

under-voltage lockout, over-voltage protection, short-

circuit protection, current limit, and output voltage pre-

• Telecom

bias startup allow for a reliable and robust solution.

• Networking Equipment

The LM3151/2/3 SIMPLE SWITCHER concept

• Routers

provides for an easy to use complete design using a

• Security Surveillance

minimum number of external components and TI’s

• Power Modules

WEBENCH online design tool. WEBENCH provides

design support for every step of the design process

and includes features such as external component

calculation with a new MOSFET selector, electrical

simulation, thermal simulation, and Build-It boards for

prototyping.

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.

2PowerWise is a trademark of Texas Instruments.

3SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.

4All 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 (26 pages)

PAGE 1
LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 LM3151/LM3152/LM3153 SIMPLE SWITCHER® CONTROLLER, High Input Voltage Synchronous Step-Down Check for Samples: LM3151, LM3152, LM3153 FEATURES DESCRIPTION • • • • The LM3151/2/3 SIMPLE SWITCHER Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current in a typical application.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Typical Application EN VCC VIN BST CVCC VIN VIN CBST CIN LM3151/2/3 M1 HG L VOUT SS SW CSS M2 LG FB COUT PGND SGND Connection Diagram 1 2 3 4 5 6 7 PGND VCC VIN LG EN BST FB SGND SS N/C EP HG SW SGND N/C 14 13 12 11 10 9 8 Figure 1.
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LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 PIN DESCRIPTIONS Pin Name Description Function 1 VCC Supply Voltage for FET Drivers Nominally regulated to 5.95V. Connect a 1 µF to 2.2 µF decoupling capacitor from this pin to ground. 2 VIN Input Supply Voltage Supply pin to the device. Nominal input range is 6V to 42V. See ordering information for Vin limitations.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 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. ABSOLUTE MAXIMUM RATINGS (1) (2) VIN to GND -0.3V to 47V SW to GND -3V to 47V BST to SW -0.3V to 7V BST to GND -0.3V to 52V All Other Inputs to GND ESD Rating -0.
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LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 ELECTRICAL CHARACTERISTICS (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com SIMPLIFIED BLOCK DIAGRAM EN LM3151/2/3 EN AVDD 6V VIN VDD 6V LDO VIN 1.20V 0.72V 0.6V Vbias 1 M5 VCC CIN UVLO GND VCC THERMAL SHUTDOWN CVCC 1.20V RON BST ON TIMER Ron VDD VIN OFF TIMER START COMPLETE START COMPLETE CBST ISS HG SS LOGIC CSS DrvH LEVEL SHIFT DrvL REGULATION COMPARATOR FB 47 pF PMOS input Vref = 0.
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LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 TYPICAL PERFORMANCE CHARACTERISTICS Boost Diode Forward Voltage vs. Temperature Quiescent Current vs. Temperature Figure 2. Figure 3. Soft-Start Current vs. Temperature VCC Current Limit vs. Temperature Figure 4. Figure 5. VCC Dropout vs. Temperature VCC vs. Temperature Figure 6. Figure 7.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 8 VCL vs. Temperature On-Time vs. Temperature (250 kHz) Figure 8. Figure 9. On-Time vs. Temperature (500 kHz) On-Time vs. Temperature (750 kHz) Figure 10. Figure 11.
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LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 THEORY OF OPERATION The LM3151/2/3 synchronous step-down SIMPLE SWITCHER Controller employs a Constant On-Time (COT) architecture which is a derivative of the hysteretic control scheme. COT relies on a fixed switch on-time to regulate the output. The on-time of the high-side switch is set internally by resistor RON.
PAGE 10
LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Current Limit Current limit detection occurs during the off-time by monitoring the current through the low-side switch. If during the off-time the current in the low-side switch exceeds the user defined current limit value, the next on-time cycle is immediately terminated. Current sensing is achieved by comparing the voltage across the low-side switch against an internal reference value, VCL, of 200 mV.
PAGE 11
LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 Short-Circuit Protection The LM3151/2/3 will sense a short-circuit on the output by monitoring the output voltage. When the attenuated feedback voltage has fallen below 60% of the reference voltage, Vref x 0.6 (≈ 0.36V), short-circuit mode of operation will start. During short-circuit operation, the SS pin is discharged and the output voltage will fall to 0V.
PAGE 12
LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Design Guide The design guide provides the equations required to design with the LM3151/2/3 SIMPLE SWITCHER Controller. WEBENCH design tool can be used with or in place of this section for a more complete and simplified design process. 1. Define Power Supply Operating Conditions a. Maximum and Minimum DC Input voltage b. Maximum Expected Load Current during normal operation c. Target Switching Frequency 2.
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LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 Table 1. Inductor Selection Table Inductor Designator Inductance (µH) Current (A) L01 47 7-9 Part Name Vendor L02 33 L03 22 7-9 SER2817H-333KL COILCRAFT 7-9 SER2814H-223KL L04 COILCRAFT 15 7-9 7447709150 WURTH L05 10 7-9 RLF12560T-100M7R5 TDK L06 6.8 7-9 B82477-G4682-M EPCOS L07 4.7 7-9 B82477-G4472-M EPCOS L08 3.3 7-9 DR1050-3R3-R COOPER L09 2.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Table 1. Inductor Selection Table (continued) Inductor Designator Inductance (µH) Current (A) L48 0.33 15- Part Name Vendor 4. Determine Output Capacitance Typical hysteretic COT converters similar to the LM3151/2/3 require a certain amount of ripple that is generated across the ESR of the output capacitor and fed back to the error comparator.
PAGE 15
LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 Figure 14. Typical MOSFET Gate Charge Curve See following design example for estimated power dissipation calculation. 6. Calculate Input Capacitance The main parameters for the input capacitor are the voltage rating, which must be greater than or equal to the maximum DC input voltage of the power supply, and its rms current rating. The maximum rms current is approximately 50% of the maximum load current.
PAGE 16
LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Design Example VIN VCC EN CVCC CEN VIN VIN M1 HG CBYP LM3151/2/3 CIN BST CBST L SS VOUT SW CSS COUT FB LG SGND M2 PGND Figure 15. Design Example Schematic 1.Define Power Supply Operating Conditions a. VOUT = 3.3V b. VIN-MIN = 6V, VIN-TYP = 12V, VIN-MAX = 24V c. Typical Load Current = 12A, Max Load Current = 15A d. Soft-Start time tSS = 5 ms 2.
PAGE 17
LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 Minimum output capacitance is: COmin = 70 / (fS2 x L) COmin = 70 / (500 kHz2 x 1.65 µH) = 169 µF The maximum ESR allowed to prevent over-voltage protection during normal operation is: ESRmax = (80 mV x L) / ET ESRmax = (80 mV x 1.65 µH) / 5.7 V µs ESRmax = 23 mΩ The minimum ESR must meet both of the following criteria: ESRmin ≥ (15 mV x L) / ET ESRmin ≥ [ET / (VIN - VOUT)] / CO ESRmin ≥ (15 mV x 1.65 µH) / 5.7 V µs = 4.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com When the FET is mounted onto the PCB, the PCB will have some additional thermal resistance such that the total system thermal resistance of the FET package and the PCB, θJA, is typically in the range of 30°C/W for this type of FET package.
PAGE 19
LM3151, LM3152, LM3153 www.ti.com SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 Bill of Materials Designator Value Parameters Manufacturer Part Number CBST 0.47 µF Ceramic, X7R, 16V, 10% TDK C2012X7R1C474K CBYP 0.1 µF Ceramic, X7R, 50V, 10% TDK C2012X7R1H104K C1608X7R1H102K CEN 1000 pF Ceramic, X7R, 50V, 10% TDK CIN1 100 µF AL, EEV-FK, 63V, 20% Panasonic EEV-FK1J101P CIN2, CIN3 10 µF Ceramic, X5R, 35V, 10% Taiyo Yuden GMK325BJ106KN-T COUT1, COUT2 150 µF AL, UE, 6.
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LM3151, LM3152, LM3153 SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com VIN M1 L M2 CIN COUT Figure 16. Schematic of Parasitics HG D G D S M1 S + - S D D VIN L VOUT CIN S xx S S LG D D COUT D G HG LG xx PGND vias to ground plane D M2 LM3151/2/3 Figure 17.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-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) LM3151MH-3.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LM3151 -3.3 LM3151MHE-3.3/NOPB ACTIVE HTSSOP PWP 14 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LM3151 -3.3 LM3151MHX-3.
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PACKAGE OPTION ADDENDUM www.ti.com (3) 11-Apr-2013 MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side 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 Top-Side Marking for that device.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-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 LM3151MHE-3.3/NOPB HTSSOP PWP 14 250 178.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM3151MHX-3.3/NOPB HTSSOP PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM3152MHE-3.3/NOPB HTSSOP PWP 14 250 178.0 12.4 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3151MHE-3.3/NOPB HTSSOP PWP LM3151MHX-3.3/NOPB HTSSOP PWP 14 250 210.0 185.0 35.0 14 2500 367.0 367.0 35.0 LM3152MHE-3.3/NOPB HTSSOP PWP LM3152MHX-3.3/NOPB HTSSOP PWP 14 250 210.0 185.0 35.0 14 2500 367.0 367.0 LM3153MHE-3.3/NOPB HTSSOP 35.0 PWP 14 250 210.0 185.0 35.0 LM3153MHX-3.
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MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.
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