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LTC3548

Features: ` High Efficiency: Up to 95%` Very Low Quiescent Current: Only 40µA` 2.25MHz Constant Frequency Operation` High Switch Current: 0.7A and 1.2A` No Schottky Diodes Required` Low RDS(ON) Internal Switches: 0.35` Current Mode Operation for Excellent Line and Load Transient Response` Sh...

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SeekIC No. : 004402294 Detail

LTC3548: Features: ` High Efficiency: Up to 95%` Very Low Quiescent Current: Only 40µA` 2.25MHz Constant Frequency Operation` High Switch Current: 0.7A and 1.2A` No Schottky Diodes Required` Low RDS(ON...

LTC3548 Data Sheet

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Part Number:
LTC3548
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:

` High Efficiency: Up to 95%
` Very Low Quiescent Current: Only 40µA
` 2.25MHz Constant Frequency Operation
` High Switch Current: 0.7A and 1.2A
` No Schottky Diodes Required
` Low RDS(ON) Internal Switches: 0.35
` Current Mode Operation for Excellent Line and Load Transient Response
` Short-Circuit Protected
` Low Dropout Operation: 100% Duty Cycle
` Ultralow Shutdown Current: IQ < 1µA
` Output Voltages from 5V down to 0.6V
` Power-On Reset Output
` Externally Synchronizable Oscillator
` Small Thermally Enhanced MSOP and 3mm * 3mm DFN Packages


Application

· PDAs/Palmtop PCs
· Digital Cameras
· Cellular Phones
· Portable Media Players
· PC Cards
· Wireless and DSL Modems


Pinout

Connection Diagram


Specifications

VIN Voltages.................................................0.3V to 6V
VFB1, VFB2, RUN1, RUN2
    Voltages ..................................... 0.3V to VIN + 0.3V
MODE/SYNC Voltage ...................... 0.3V to VIN + 0.3V
SW1, SW2 Voltage ......................... 0.3V to VIN + 0.3V
POR Voltage ................................................0.3V to 6V
Ambient Operating Temperature
    Range (Note 2) ................................... 40 to 85
Junction Temperature (Note 5) ............................. 125
Storage Temperature Range ................. 65 to 125
Lead Temperature (Soldering, 10 sec)
    LTC3548EMSE only .......................................... 300


Description

The LTC®3548 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile 1.2mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35, 0.7A/1.2A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input of LTC3548 is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while Pulse Skip Mode provides low noise ripple at light loads.

To further maximize battery runtime, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40µA. In shutdown, the device draws <1µA.




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