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LTC3772B

Features: No Current Sense Resistor Required High Output Currents Easily Achieved Internal Soft-Start Ramps VOUT Wide VIN Range: 2.75V to 9.8V Low Dropout: 100% Duty Cycle Constant Frequency 550kHz Operation Low Ripple Pulse Skipping Operation at Light Load Output Voltage as Low as 0.8V ±1.5% Vol...

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SeekIC No. : 004402340 Detail

LTC3772B: Features: No Current Sense Resistor Required High Output Currents Easily Achieved Internal Soft-Start Ramps VOUT Wide VIN Range: 2.75V to 9.8V Low Dropout: 100% Duty Cycle Constant Frequency 550kHz...

LTC3772B Data Sheet

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Part Number:
LTC3772B
Supply Ability:
5000

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

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Product Details

Description



Features:

No Current Sense Resistor Required
High Output Currents Easily Achieved
Internal Soft-Start Ramps VOUT
Wide VIN Range: 2.75V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Low Ripple Pulse Skipping Operation at Light Load
Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 8µA Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and (3mm * 2mm) DFN (0.75mm) Packages


Application

1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN)............................ 0.3V to 10V
IPRG Voltage ................................... 0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages .............................. 0.3V to 2.4V
SW Voltage ............... 2V to (VIN + 1V) or 10V Maximum
PGATE Peak Output Current (<10µs) ............................ 1A
Operating Temperature Range (Note 2) . 40°C to 85°C
Junction Temperature (Note 3) ..............................  125°C
Storage Temperature Range ................. 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 .................................................................. 300°C


Description

The LTC®3772B is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOTTM) and a 3mm × 2mm DFN package. The No RSENSE TM architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.

The LTC3772B automatically switches into pulse skipping operation at light loads. It consumes only 200µA of quiescent current under a no-load condition.

The LTC3772B incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.




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