|Title||IC REG CTRLR BUCK HYBRID 32QFN|
|Company||Linear Technology Corporation|
|Datasheet||Download LTC7821EUHPBF datasheet
|Others parts numbering|
The LTC®7821 uses a proprietary architecture that merges a soft switching charge pump topology with a synchronous step-down converter to provide superior efficiency and EMI performance compared to traditional switching architectures. In a typical to 12V application, efficiency of greater than 97% is attainable with the LTC7821 switching at 500kHz. The same efficiency can only be achieved with a traditional controller switching at one-third the frequency. Higher switching frequencies allow the use of smaller inductances that yield faster transient response and smaller solution size. The LTC7821 can be easily paralleled to provide higher output currents with its accurate current sharing capability and frequency synchronization function.
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Wide VIN Range: 72V (80V ABS Max) Soft Switching for Low Noise Operation Phase-Lockable Fixed Frequency 1.5MHz ±1% Output Voltage Accuracy RSENSE or DCR Current Sensing Programmable CCM, DCM, or Burst Mode® Operation CLKOUT Pin for Multiphase Operation Short Circuit Protected EXTVCC Input for Improved Efficiency Monotonic Output Voltage Start-Up Optional External Reference × 5mm) QFN Intermediate Bus Converters High Current Distributed Power Systems Telecom, Datacom, and Storage SystemsAPPLICATIONS
100 1µF VIN_SENSE VIN 0.22µF BOOST1 TIMER BG1 BOOST2 MID INTVCC 10k FAULT PGOOD PINS NOT SHOWN IN THIS CIRCUIT: CLKOUT TEMP RUN HYS_PRGM MODE/PLLIN TRACK/SS 8V 10k FAULT PGOOD SW3 BG2 INTVCC PGND EXTVCC VFB ISNS+ ISNS 60.4k
Input Supply Voltage (VIN, VIN_SENSE)....... to 80V Top Side Driver Voltages to 46V Switch Voltages to 40V MID, MID_SENSE....................................... to 6V ISNS+, ISNS to 40V (ISNS+ ISNS ).......................................................±0.6V EXTVCC...................................................... to 40V TEMP, FREQ, EXT_REF, VFB.................. 0.3V to INTVCC HYS_PRGM, ITH, RUN, TRACK/SS....... 0.3V to INTVCC FAULT, PGOOD........................................... to 80V TIMER, MODE/PLLIN............................ 0.3V to INTVCC Peak Output Current................................100mA Operating Junction Temperature Range (Notes to 125°C Storage Temperature Range.................. to 150°CTJMAX = 7.3°C/W EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
PART MARKING* 7821 PACKAGE DESCRIPTION × 5mm) Plastic QFN × 5mm) Plastic QFN TEMPERATURE RANGE to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are = 25°C (Note 2). VIN = VIN_SENSE = 48V, VRUN = 5V, EXTVCC = 9V, EXT_REF = 5.6V unless otherwise noted.
SYMBOL VIN PARAMETER Input Voltage Range Output Voltage Range VFB IFB VREFLNREG VLOADREG gm IVIN Regulated Feedback Voltage Feedback Current Reference Voltage Line Regulation Output Voltage Load Regulation (Note 4) ITH Voltage (Note 5) (Note 4) VIN to 72V (Note 5) (Note 4) ITH Voltage to 0.7V ITH Voltage to 1.6V ITH = 1.15V; Sink/Source 5µA (Note 5) (Note 6) VRUN = 0V VIN = 20V, VMID = VMID_SENSE = 10V VIN = 20V, VMID = VMID_SENSE = 5V (Note 6) VRUN = 0V, VEXT_REF = 0V (Note 6)Transconductance Amplifier gm Input DC Supply Current Normal Mode Shutdown Precharging Phase
IVIN_SENSE IEXTVCC IMID IMID_SENSE VUVLO VUVLO_HYST VSENSE ISNS+/ITRACK/SS VRUN_ON IRUN VRUN_HYST VEXT_REF_UC VEXT_REF_LC VSEL_EXT_REF IEXT_REF VTEMP_TRIP VTEMP_TRIP_HYST ITEMP VBSTUVLO VBSTUVLO_HYST TOUT
Input DC Supply Current Normal Mode Shutdown Input DC Supply Current MID Pin Current MID_SENSE Pin Current VIN Undervoltage Lockout UVLO Hysteresis Current Sense Threshold ISNS+ and ISNS Pin Current Soft-Start Charge Current RUN Pin On Threshold RUN Pin Current RUN Pin Hysteresis EXT_REF Upper Clamp Limit EXT_REF Lower Clamp Limit EXT_REF De-Select Threshold (Ramping Up) EXT_REF Pin Current TEMP Pin Trip Point, Rising TEMP Pin Trip Point Hysteresis TEMP Pin Current Undervoltage Lockout (BOOST1-SW1), (BOOST2- VMID) and (BOOST3-SW3) Bootstrap Undervoltage Lockout Hysteresis TEMP Trip TimeOut
VIN Ramping Up VISNS = 0V VISNS+ = VISNS = 12V VTRACK/SS = 0V VRUN Rising VRUN = 0V (Note 5) (Note 5) VEXT_REF = 0.6V
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