Digchip : Database on electronics components
Electronics components database



Details, datasheet, quote on part number: LTC1629CG-PG
 
 
Part numberLTC1629CG-PG
CategoryPower Management => Regulators => Switching Regulators => Step-Down
TitleStep-Down
DescriptionLTC1629, 36V Polyphase, High Efficiency, Synchronous Step-down Switching Regulator
CompanyLinear Technology Corporation
DatasheetDownload LTC1629CG-PG datasheet
Request For QuoteFind where to buy LTC1629CG-PG
 


 
Specifications, Features, Applications
LTC1629/LTC1629-PG PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulators
FEATURES

Dual Controller Operates from One to Twelve Phases Reduces Required Input Capacitance and Power Supply Induced Noise Current Mode Control Ensures Current Sharing Phase-Lockable Fixed Frequency: 300kHz 1.8MHz Effective Switching Frequency True Remote Sensing Differential Amplifier OPTI-LOOPTM Compensation Reduces COUT 1% Output Voltage Accuracy Power Good Output Voltage Monitor (LTC1629-PG) Wide VIN Range: to 36V Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Internal Current Foldback Plus Shutdown Timer Overvoltage Soft-Latch Eliminates Nuisance Trips Micropower Shutdown Available in 28-Lead SSOP Package

The LTC1629/LTC1629-PG are multiple phase, dual, synchronous step-down current mode switching regulator controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The PolyPhaseTM controller drives its two output stages out of phase at frequencies 300kHz to minimize the RMS ripple currents in both input and output capacitors. The output clock signal allows expansion for to 12 evenly phased controllers for systems requiring 200A of output current. The multiple phase technique effectively multiplies the fundamental frequency by the number of channels used, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified. An internal differential amplifier provides true remote sensing of the regulated supply's positive and negative output terminals as required for high current applications. A RUN/SS pin provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC1629-PG includes a power good output pin that replaces the AMPMD control pin of the LTC1629.

Desktop Computers Internet Servers Large Memory Arrays DC Power Distribution Systems

, LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP and PolyPhase are trademarks of Linear Technology Corporation.

Figure 1. High Current Dual Phase Step-Down Converter

TOP VIEW RUN/SS SENSE1 EAIN PLLFLTR PLLIN PHASMD ITH SGND CLKOUT BOOST1 24 VIN BG1 22 EXTVCC 21 INTVCC 20 PGND TG2 15 AMPMD*

Input Supply Voltage 0.3V Topside Driver Voltages 0.3V Switch Voltage SENSE2 Voltages........................ 0.3V EAIN, VOS+, VOS, EXTVCC, INTVCC, RUN/SS, AMPMD, PGOOD 0.3V Boosted Driver Voltage 0.3V PLLFLTR, PLLIN, CLKOUT, PHASMD, VDIFFOUT Voltages................................ INTVCC 0.3V ITH 0.3V Peak Output Current BG1,2)................ 5A INTVCC RMS Output Current................................ 50mA Operating Ambient Temperature Range to 85C Junction Temperature (Note 2)............................. 125C Storage Temperature Range................. to 150C Lead Temperature (Soldering, 10 sec).................. 300C

SYMBOL VEAIN VSENSEMAX IINEAIN VLOADREG PARAMETER Regulated Feedback Voltage Maximum Current Sense Threshold Feedback Current Output Voltage Load Regulation Main Control Loop

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.

CONDITIONS (Note 3); ITH Voltage = 1.2V VSENSE 5V; LTC1629 Only (Note 3) (Note 3) Measured in Servo Loop; ITH Voltage = 0.7V Measured in Servo Loop; ITH Voltage = 2V VIN to 30V (Note 3) Measured at VEAIN VIN Ramping Down ITH = 1.2V; Sink/Source 5A; (Note 3) ITH = 1.2V; (gmxZL; No Ext Load); (Note 3) (Note 4) EXTVCC Tied to VOUT; VOUT = 5V VRUN/SS = 0V VRUN/SS = 1.9V VRUN/SS Rising VRUN/SS Rising from 3V Soft Short Condition VEAIN = 0.5V; VRUN/SS = 4.5V VEAIN = 0.5V

Reference Voltage Line Regulation Output Overvoltage Threshold Undervoltage Lockout Transconductance Amplifier gm Transconductance Amplifier Gain Input DC Supply Current Normal Mode Shutdown Soft-Start Charge Current RUN/SS Pin ON Threshold RUN/SS Pin Latchoff Arming RUN/SS Discharge Current Shutdown Latch Disable Current

SYMBOL ISENSE DFMAX 2 tf TG/BG t1D BG/TG t2D tON(MIN) VINTVCC VLDO INT VLDO EXT VEXTVCC VLDOHYS fNOM fLOW fHIGH RPLLIN IPLLFLTR PARAMETER Total Sense Pins Source Current Maximum Duty Factor Top Gate Transition Time: Rise Time Fall Time Bottom Gate Transition Time: Rise Time Fall Time Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time Minimum On-Time Internal VCC Voltage INTVCC Load Regulation EXTVCC Voltage Drop EXTVCC Switchover Voltage EXTVCC Switchover Hysteresis Nominal Frequency Lowest Frequency Highest Frequency PLLIN Input Resistance Phase Detector Output Current Sinking Capability Sourcing Capability Controller 2-Controller 1 Phase (Relative to Controller 1) fPLLIN < fOSC fPLLIN > fOSC VPHASMD = 0V, Open VPHASMD = 5V VPHASMD = 0V VPHASMD = Open VPHASMD 4 0.2 IPGOOD = 2mA VPGOOD = 5V VEAIN with Respect to Set Output Voltage VEAIN Ramping Negative VEAIN Ramping Positive Differential Amp Mode Differential Amp Mode; 0V < VCM < 5V Differential Amp Mode; Measured at VOS + Input

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.

CONDITIONS Each Channel; 0V In Dropout CLOAD = 3300pF CLOAD = 3300pF CLOAD = 3300pF CLOAD = 3300pF CLOAD = 3300pF Each Driver CLOAD = 3300pF Each Driver Tested with a Square Wave (Note 6V < VIN < 30V; VEXTVCC = 4V ICC to 20mA; VEXTVCC = 4V ICC = 20mA; VEXTVCC 5V; LTC1629 ICC = 20mA; VEXTVCC 5V; LTC1629-PG ICC = 20mA, EXTVCC Ramping Positive ICC = 20mA, EXTVCC Ramping Negative VPLLFLTR = 1.2V VPLLFLTR = 0V VPLLFLTR 120 280

Clock High Output Voltage Clock Low Output Voltage PGOOD Voltage Low PGOOD Leakage Current PGOOD Trip Level, Either Controller

Differential Amplifier/Op Amp Gain Block (Note 5) ADA CMRRDA RIN Gain Common Mode Rejection Ratio Input Resistance




Related products with the same datasheet
LTC1629-PG   LTC1629CG   LTC1629IG   LTC1629IG-PG   LTC1629CG-PG#PBF   LTC1629CG-PG#TR  
LTC1629CG-PG#TRPBF   LTC1629IG-PG#PBF   LTC1629IG-PG#TR   LTC1629IG-PG#TRPBF  


Some Part number from the same manufacture Linear Technology Corporation
LTC1629EG-6 Polyphase, Synchronous Step-down Switching Regulator
LTC1629I Polyphase, High Efficiency, Synchronous Step-down Switching Regulators
LTC1629IG LTC1629, 36V Polyphase, High Efficiency, Synchronous Step-down Switching Regulator
LTC1642 LTC1642, 3V to 15V, Protects to 33V, SSOP-16, Active Current Limiting
LTC1642C Hot Swap Controller
LTC1642CGN LTC1642, 3V to 15V, Protects to 33V, SSOP-16, Active Current Limiting
LTC1642I Hot Swap Controller
LTC1642IGN LTC1642, 3V to 15V, Protects to 33V, SSOP-16, Active Current Limiting
LTC1643
LTC1643 Pci-bus Hot Swap Controller
LTC1643A
LTC1643AH
LTC1643H LTC1643H, 3.3V, 5V, +/-12V, SSOP-16, Active High For Pci, Active Current Limiting
LTC1643HCGN Pci-bus Hot Swap Controller
LTC1643L LTC1643H, 3.3V, 5V, +/-12V, SSOP-16, Active High For Pci, Active Current Limiting
LTC1643L-1 Pci-bus Hot Swap Controller
LTC1643L-1IGN
LTC1643LIGN
LTC1644 LTC1644, Compactpci Bus Hot Swap Controller, 3V, 5V, +/-12V
LTC1645 LTC1645, Dual-channel Hot Swap Controller/power Sequencer, 3V to 12V, SO-8 or SO-14
LTC1645C Dual-channel Hot Swap Controller/power Sequencer