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LTC3822-1

Features: ` Dual N-Channel MOSFET Synchronous Drive` No Current Sense Resistor Required` Optimized for 3.3VIN and Li-Ion Applications` Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response` ±1% 0.6V Reference` Low Dropout Operation: 99% Duty Cycle` Phase-Lockable...

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SeekIC No. : 004402369 Detail

LTC3822-1: Features: ` Dual N-Channel MOSFET Synchronous Drive` No Current Sense Resistor Required` Optimized for 3.3VIN and Li-Ion Applications` Constant Frequency Current Mode Operation for Excellent Line an...

LTC3822-1 Data Sheet

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Part Number:
LTC3822-1
Supply Ability:
5000

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

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Product Details

Description



Features:

` Dual N-Channel MOSFET Synchronous Drive
` No Current Sense Resistor Required
` Optimized for 3.3VIN and Li-Ion Applications
` Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
` ±1% 0.6V Reference
` Low Dropout Operation: 99% Duty Cycle
` Phase-Lockable or Adjustable Frequency: 250kHz to 750kHz
` Internal Soft-Start Circuitry
` Tracking and Adjustable Soft-Start Input
` Selectable Maximum Peak Current Sense Threshold
` Selectable Burst Mode®/ Forced Continuous/Pulse Skipping Mode at Light Load
` Digital RUN Control Pin
` Output Overvoltage Protection
` Micropower Shutdown: IQ = 7.5A
` Tiny Thermally Enhanced 12-Pin (3mm * 3mm) DFN or 16-Pin Narrow SSOP Packages


Application

· Single Cell Li-Ion Powered Systems
· 3.3VIN Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) ........................ 0.3V to 4.5V
BOOST Voltage .......................................... 0.3V to 10V
PLLLPF, RUN, IPRG, SYNC/MODE,
TRACK/SS Voltages .......................0.3V to (VIN + 0.3V)
VFB, ITH Voltages ....................................... 0.3V to 2.4V
SW Voltage ............................................ 2V to VIN + 1V
Operating Temperature Range (Note 2) ... 40°C to 85°C
Storage Ambient Temperature Range
DD ..................................................... 65°C to 125°C
GN ..................................................... 65°C to 150°C
Junction Temperature (Note 3) ............................. 125°C
Lead Temperature (Soldering, 10 sec)
GN Only ............................................................ 300°C


Description

The LTC®3822-1 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves effi ciency.

Burst Mode operation provides high effi ciency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered
systems.

The operating frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250kHz to 750kHz.

The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin narrow SSOP package.




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