Datasheet

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

LM3150

VCC

PGND

SGND

BST

ILIM

VIN

RON

OUT

BST

VCC

LIM

FB2

FB1

LM3150

www.ti.com

SNVS561D –SEPTEMBER 2008–REVISED MARCH 2011

LM3150 SIMPLE SWITCHER

CONTROLLER, 42V Synchronous Step-Down

Check for Samples: LM3150

FEATURES

DESCRIPTION

The LM3150 SIMPLE SWITCHER

Controller is an

• 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

• Adjustable Output Voltage Down to 0.6V

typical application. Operating with an input voltage

range of 6V-42V, the LM3150 features an adjustable

• Programmable Switching Frequency up to 1

output voltage down to 0.6V. The switching frequency

MHz

is adjustable up to 1 MHz and the synchronous

• No Loop Compensation Required

architecture provides for highly efficient designs. The

• Fully WEBENCH

Enabled

LM3150 controller employs a Constant On-Time

(COT) architecture with a proprietary Emulated Ripple

• Low External Component Count

Mode (ERM) control that allows for the use of low

• Constant On-Time Control

ESR output capacitors, which reduces overall solution

• Ultra-fast Transient Response

size and output voltage ripple. The Constant On-Time

(COT) regulation architecture allows for fast transient

• Stable with Low ESR Capacitors

response and requires no loop compensation, which

• Output Voltage Pre-bias Startup

reduces external component count and reduces

• Valley Current Limit

design complexity.

• Programmable Soft-start

Fault protection features such as thermal shutdown,

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

TYPICAL APPLICATIONS

circuit protection, current limit, and output voltage pre-

bias startup allow for a reliable and robust solution.

• Telecom

• Networking Equipment

The LM3150 SIMPLE SWITCHER

concept provides

for an easy to use complete design using a minimum

• Routers

number of external components and TI’s WEBENCH

• Security Surveillance

online design tool. WEBENCH

provides design

• Power Modules

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.

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.

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 (26 pages)

PAGE 1
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 LM3150 SIMPLE SWITCHER® CONTROLLER, 42V Synchronous Step-Down Check for Samples: LM3150 FEATURES DESCRIPTION 1 • • • • 2 • • • • • • • • • The LM3150 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. Operating with an input voltage range of 6V-42V, the LM3150 features an adjustable output voltage down to 0.6V.
PAGE 2
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Connection Diagram 1 2 3 4 5 6 7 PGND VCC VIN LG BST EN FB SGND SS RON EP HG SW SGND ILIM 14 13 12 11 10 9 8 Figure 1. TSSOP-14 PIN DESCRIPTIONS Pin Name Description Function 1 VCC Supply Voltage for FET Drivers Nominally regulated to 5.95V. Connect a 1.0 µF to 4.7 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.
PAGE 3
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 Absolute Maximum Ratings (1) (2) VIN, RON 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 -0.3V to 7V ESD Rating (3) 2 kV Storage Temperature Range (1) -65°C to +150°C Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
PAGE 4
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com 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.
PAGE 5
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 Simplified Block Diagram EN EN LM3150 6V VIN AVDD 1 M5 6V LDO VIN 1.20V 0.72V 0.6V Vbias VDD VCC UVLO CIN GND RON ON TIMER Ron START COMPLETE RON VCC THERMAL SHUTDOWN CVCC 1.20V toff OFF TIMER START COMPLETE BST CBST VDD HG ISS SS LOGIC DrvH LEVEL SHIFT DrvL CSS REGULATION COMPARATOR FB Vref = 0.6V PMOS input Zero Current Detect 0.
PAGE 6
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Typical Performance Characteristics 6 Boost Diode Forward Voltage vs. Temperature ILIM-TH vs. Temperature Figure 2. Figure 3. Quiescent Current vs. Temperature Soft-Start Current vs. Temperature Figure 4. Figure 5. tON vs. Temperature tON vs. Temperature Figure 6. Figure 7.
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LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 Typical Performance Characteristics (continued) tON vs. Temperature VCC Current Limit vs. Temperature Figure 8. Figure 9. VCC Dropout vs. Temperature VCC vs. Temperature Figure 10. Figure 11.
PAGE 8
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com THEORY OF OPERATION The LM3150 synchronous step-down SIMPLE SWITCHER® Controller utilizes 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 can be set manually by adjusting the size of an external resistor (RON).
PAGE 9
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 Over-Voltage Comparator The over-voltage comparator is provided to protect the output from over-voltage conditions due to sudden input line voltage changes or output loading changes. The over-voltage comparator continuously monitors the voltage at the FB pin and compares it to a 0.72V internal reference. If the voltage at FB rises above 0.72V, the on-time pulse is immediately terminated.
PAGE 10
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com ILIM-TH(TJ) = ILIM-TH x [1 + 3.3 x 10-3 x (TJ - 27)] (10) To calculate the RLIM value with temperature compensation, substitute equation (10) into ILIM-TH in equation (7). Short-Circuit Protection The LM3150 will sense a short-circuit on the output by monitoring the output voltage. When the feedback voltage has fallen below 60% of the reference voltage, Vref x 0.6 (≈ 0.36V), short-circuit mode of operation will start.
PAGE 11
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 Enable/Shutdown The EN pin can be activated by either leaving the pin floating due to an internal pull up resistor to VIN or by applying a logic high signal to the EN pin of 1.26V or greater. The LM3150 can be remotely shut down by taking the EN pin below 1.02V. Low quiescent shutdown is achieved when VEN is less than 0.4V. During low quiescent shutdown the internal bias circuitry is turned off.
PAGE 12
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Figure 13. Minimum VIN vs. VOUT IOUT = 10 A 4.
PAGE 13
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 47 P 100 90 80 70 60 50 L13 L02 L14 H L37 L25 L03 40 E À T (V À Ps) 33 P H L01 L04 L16 20 L05 L17 L06 L18 L22 2 L11 L23 L12 L24 5 H 4.7 P L29 L42 H 3.3 P L43 2.2 P L44 1.5 P L32 L45 1.0 P L33 L46 P 0.68 L34 L47 PH 0.47 L35 6 H 6.8 P L48 H H H H P 0.
PAGE 14
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com Table 1. Inductor Selection Table (continued) Inductor Designator Inductance (µH) Current (A) Part Name Vendor L26 15 12-15 L27 10 L28 6.8 12-15 SER2814L-103KL COILCRAFT 12-15 7447709006 WURTH L29 L30 4.7 12-15 7447709004 WURTH 3.3 12-15 L31 2.2 12-15 L32 1.5 12-15 MLC1245-152 COILCRAFT L33 1 12-15 L34 0.68 12-15 DO3316H-681 COILCRAFT L35 0.47 12-15 L36 0.
PAGE 15
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 ZFB = (RFB1 x RFB2)/(RFB1 + RFB2) Cff = VOUT/(VIN-MIN x fS x ZFB) (21) (22) 7. MOSFET and RLIM Selection The high-side and low-side FETs must have a drain to source (VDS) rating of at least 1.2 x VIN. Use the following equations to calculate the desired target value of the low-side FET RDS(ON) for current limit. ICL x RDS(ON)max RLIM (Tj) = ILIM-TH (Tj) (23) (24) ILIM-TH(Tj) = ILIM-TH x [1 + 3.
PAGE 16
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com 9. Calculate Soft-Start Capacitor ISS x tSS Vref CSS = where • • tss is the soft-start time in seconds Vref = 0.6V (27) 10. CVCC, CBST and CEN CVCC should be placed directly at the VCC pin with a recommended value of 1 µF to 4.7 µF. CBST creates a voltage used to drive the gate of the high-side FET. It is charged during the SW off-time. The recommended value for CBST is 0.47 µF.
PAGE 17
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 tOFF = (1-0.55)/687 kHz = 654 ns tOFF should meet the following criteria: tOFF > tOFF-MIN + 200 ns tOFF > 725 ns At the maximum switching frequency of 687 kHz, which is limited by the minimum on-time, the off-time of 654 ns is less than 725 ns. Therefore the switching frequency should be reduced and meet the following criteria: fs < (1 - D)/725 ns fS < (1 - 0.
PAGE 18
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com For this design a feed-forward capacitor will be used to help minimize output ripple. ESRmax = (80 mV x 1.65 µH x 1) / 5.7 V µs ESRmax = 23 mΩ The minimum ESR must meet both of the following criteria: ESRmin ≥ (15 mV x L x Af) / ET ESRmin ≥ [ ET / (VIN - VOUT) ] x (Af / CO) ESRmin ≥ (15 mV x 1.65 µH x 1) / 5.7 V µs = 4.3 mΩ ESRmin ≥ [5.7 V µs / (12 - 3.3) ] x (1 / 169 µF) = 3.
PAGE 19
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 The max power dissipation of the RJK0305DPB is rated as 45W for a junction temperature that is 125°C higher than the case temperature and a thermal resistance from the FET junction to case, θJC, of 2.78°C/W.
PAGE 20
LM3150 SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 www.ti.com 10. CVCC, CEN, and CBST CVCC = 4.7 µF ceramic with a voltage rating greater than 10V CEN = 1000 pF ceramic with a voltage rating greater than 10V CBST = 0.47 µF ceramic with a voltage rating greater than 10V Bill of Materials Designator Value Parameters Manufacturer Part Number CBST 0.47 µF Ceramic, X7R, 16V, 10% TDK C2012X7R1C474K CBYP 0.
PAGE 21
LM3150 www.ti.com SNVS561D – SEPTEMBER 2008 – REVISED MARCH 2011 VIN M1 L M2 CIN COUT Figure 17. 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 LG HG xx PGND vias to ground plane D M2 LM3150 Figure 18.
PAGE 22
PACKAGE OPTION ADDENDUM www.ti.
PAGE 23
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) LM3150MHE/NOPB HTSSOP PWP 14 250 178.0 12.4 LM3150MHX/NOPB HTSSOP PWP 14 2500 330.0 12.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 6.95 8.3 1.6 8.0 12.0 Q1 6.95 8.3 1.6 8.0 12.
PAGE 24
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) LM3150MHE/NOPB HTSSOP PWP LM3150MHX/NOPB HTSSOP PWP 14 250 210.0 185.0 35.0 14 2500 367.0 367.0 35.
PAGE 25
MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.
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