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LTC3602 Dataheets PDF



Part Number LTC3602
Manufacturers Linear Technology
Logo Linear Technology
Description Monolithic Synchronous Step-Down Regulator
Datasheet LTC3602 DatasheetLTC3602 Datasheet (PDF)

FEATURES n Wide Input Voltage Range: 4.5V to 10V n 2.5A Output Current n Low RDS(ON) Internal Switches: 65mΩ and 90mΩ n Programmable Frequency: 300kHz to 3MHz n Low Quiescent Current: 75μA n 0.6V ±1% Reference Allows Low Output Voltage n 99% Maximum Duty Cycle n Adjustable Burst Mode® Clamp n Synchronizable to External Clock n Power Good Output Voltage Monitor n Overtemperature Protection n Available in 16-Lead Exposed TSSOP and 4mm × 4mm QFN Packages APPLICATIONS n Point-of-Load Supplies n Port.

  LTC3602   LTC3602


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FEATURES n Wide Input Voltage Range: 4.5V to 10V n 2.5A Output Current n Low RDS(ON) Internal Switches: 65mΩ and 90mΩ n Programmable Frequency: 300kHz to 3MHz n Low Quiescent Current: 75μA n 0.6V ±1% Reference Allows Low Output Voltage n 99% Maximum Duty Cycle n Adjustable Burst Mode® Clamp n Synchronizable to External Clock n Power Good Output Voltage Monitor n Overtemperature Protection n Available in 16-Lead Exposed TSSOP and 4mm × 4mm QFN Packages APPLICATIONS n Point-of-Load Supplies n Portable Instruments n Server Backplane Power n Battery-Powered Devices LTC3602 2.5A, 10V, Monolithic Synchronous Step-Down Regulator DESCRIPTION The LTC®3602 is a high efficiency, monolithic synchronous, step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 10V and provides an adjustable regulated output voltage from 0.6V to 9.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 65mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The LTC3602 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference, while Burst Mode operation provides the high efficiency at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application. , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 3.3V, 2.5A, 1MHz Step-Down Regulator VIN 4.5V TO 10V 22μF PVIN RUN INTVCC BOOST 105k 4.32k 1nF RT PGOOD LTC3602 SW TRACK/SS ITH SYNC/MODE PGND VFB 105k 1μF 0.22μF 2.2μH VOUT 3.3V 2.5A 100μF 475k 22pF 3602 TA01 EFFICIENCY (%) POWER LOSS (mW) Efficiency and Power Loss vs Load Current 100 VIN = 7V 95 90 EFFICIENCY 85 POWER LOSS 80 75 70 65 60 0.01 0.1 1 LOAD CURRENT (A) 10000 1000 100 10 1 10 3602 TA01b 3602fb 1 LTC3602 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (PVIN)....................... –0.3V to 11V SW (DC)...................................... –0.3V to (PVIN + 0.3V) BOOST ................................. (VSW –0.3V) to (VSW + 6V) RUN ........................................................... –0.3V to 11V All Other Pins ............................................... –0.3V to 6V Peak SW Sink and Source Current (Note 7) .............6.5A Operating Temperature Range (Note 2)....–40°C to 85°C Junction Temperature (Notes 5, 6)........................ 125°C Lead Temperature (Soldering, FE Package 10 seconds)................. 300°C PIN CONFIGURATION TOP VIEW SYNC/MODE 1 PGOOD 2 RT 3 16 INTVCC 15 PVIN 14 BOOST ITH 4 17 13 SW VFB 5 12 SW RUN 6 11 SW TRACK/SS 7 10 PGND PGND 8 9 PGND FE PACKAGE 16-LEAD PLASTIC TSSOP TJMAX = 125°C, θJA = 38°C/W, θJC = 10°C/W EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB TOP VIEW BOOST SW SW SW SW 20 19 18 17 16 PVIN 1 PVIN 2 INTVCC 3 SYNC/MODE 4 PGOOD 5 15 PGND 14 PGND 21 13 PGND 12 PGND 11 TRACK/SS 6 7 8 9 10 RT ITH VFB SGND RUN UF PACKAGE 20-LEAD (4mm s 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 37°C/W, θJC = 10°C/W EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3602EFE#PBF LTC3602EFE#TRPBF 3602FE 16-Lead Plastic TSSOP –40°C to 85°C LTC3602IFE#PBF LTC3602IFE#TRPBF 3602FE 16-Lead Plastic TSSOP –40°C to 85°C LTC3602EUF#PBF LTC3602EUF#TRPBF 3602 20-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C LTC3602IUF#PBF LTC3602IUF#TRPBF 3602 20-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 8.4V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX PVIN VFB ΔVFB(LINEREG) ΔVFB(LOADREG) Operating Voltage Range Regulated Feedback Voltage Feedback Voltage Line Regulation Feedback Voltage Load Regulation ITH = 0.7V (Note 3) VIN = 5V to 10V, ITH = 0.7V ITH = 0.36V.


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