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LTC3850

Features: · Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise· High Effi ciency: Up to 95%· RSENSE or DCR Current Sensing· ±1% 0.8V Output Voltage Accuracy· Phase-Lockable Fixed Frequency 250kHz to 780kHz· Supports Pre-Biased Output· Dual N-Channe...

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SeekIC No. : 004402388 Detail

LTC3850: Features: · Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise· High Effi ciency: Up to 95%· RSENSE or DCR Current Sensing· ±1% 0.8V Output Voltage ...

LTC3850 Data Sheet

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Part Number:
LTC3850
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
· High Effi ciency: Up to 95%
· RSENSE or DCR Current Sensing
· ±1% 0.8V Output Voltage Accuracy
· Phase-Lockable Fixed Frequency 250kHz to 780kHz
· Supports Pre-Biased Output
· Dual N-Channel MOSFET Synchronous Drive
· Wide VIN Range: 4V to 24V (30V for LTC3850I) Operation
· Adjustable Soft-Start Current Ramping or Tracking
· Foldback Output Current Limiting
· Output Overvoltage Protection
· Power Good Output Voltage Monitor
· 28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow SSOP Packages


Application

· Notebook and Palmtop Computers
· Portable Instruments
· Battery-Operated Digital Devices
· DC Power Distribution Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) ....................... 28V to 0.3V
Input Supply Voltage (VIN),
    LTC3850I Only ...................................... 30V to 0.3V
Input Supply Transient Voltage (VIN) < 500ms, with
    INTVCC 5V, LTC3850I Only ................ 34V to 0.3V
Top Side Driver Voltages
    BOOST1, BOOST2 .................................. 34V to 0.3V
Switch Voltage (SW1, SW2) ......................... 28V to 5V
Switch Voltage (SW1, SW2),
    LTC3850I Only ....................................... 30V to 0.3V
INTVCC, RUN1, RUN2, PGOOD, EXTVCC,
(BOOST1-SW1), (BOOST2-SW2) .................. 6V to 0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2 Voltages ................................... 5.5V to 0.3V
MODE/PLLIN, ILIM,TK/SS1,TK/SS2, FREQ/PLLFLTR
Voltages ............................................... INTVCC to 0.3V
ITH1, ITH2, VFB1, VFB2 Voltages ................. 2.7V to 0.3V
INTVCC Peak Output Current .................................100mA
Operating Temperature Range (Note 2)......40 to 85
Junction Temperature (Note 3) ................................ 125
Storage Temperature Range .....................65 to 125
Lead Temperature (Soldering, 10 sec)
   (GN Package) ........................................................ 300


Description

The LTC®3850 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and supply noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3850 features a precision 0.8V reference and a power good output indicator. A wide 4V to 24V (28V maximum/30V for LTC3850I) input supply range encompasses most battery chemistries and intermediate
bus voltages.

Independent TK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock.

The LTC3850 is available in low profi le 28-pin 4mm × 4mm, 4mm × 5mm QFN and narrow SSOP packages.




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