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LTC3544B

Features: High Effi ciency: Up to 95% Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current 2.25V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diodes Required Low Dropout Operation: 100% Duty Cycle Pulse Skipping at Low Load for Min...

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SeekIC No. : 004402290 Detail

LTC3544B: Features: High Effi ciency: Up to 95% Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current 2.25V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation N...

LTC3544B Data Sheet

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Part Number:
LTC3544B
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:

High Effi ciency: Up to 95%
Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current
2.25V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diodes Required
Low Dropout Operation: 100% Duty Cycle
Pulse Skipping at Low Load for Minimum Ripple
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws <1A Supply Current
Current Mode Operation for Excellent Line and Load Transient Response
Overtemperature Protected
Low Profi le (3mm * 3mm) 16-Lead QFN Package


Application

Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments


Pinout

Connection Diagram


Specifications

Input Supply Voltage .....................................0.3V to 6V
RUNx ............................................. 0.3V to (VIN + 0.3V)
VFBx ................................................ 0.3V to (VIN + 0.3V)
SWx ............................................... 0.3V to (VIN + 0.3V)
300mA P-Channel Source Current (DC) (Note 8) ..450mA
300mA N-Channel Sink Current (DC) (Note 8) ......450mA
200mA P-Channel Source Current (DC) (Note 8) ..300mA
200mA N-Channel Sink Current (DC) (Note 8) ......300mA
100mA P-Channel Source Current (DC) (Note 8) ..200mA
100mA N-Channel Sink Current (DC) (Note 8) ......200mA
Peak 300mA SW Sink and Source Current
(Note 8) ...........................................................600mA
Peak 200mA SW Sink and Source Current
(Note 8) ...........................................................400mA
Peak 100mA SW Sink and Source Current
(Note 8) ...........................................................200mA
Operating Temperature Range ...................40 to 85
Junction Temperature (Notes 3, 4) ........................ 125
Storage Temperature Range ....................65 to 125


Description

The LTC®3544B is a quad, high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3544B well suited for single Li-Ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. At moderate and low output load levels PWM pulse skip mode operation provides very low output ripple voltage for noise sensitive applications.

Switching frequency is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors.

The internal synchronous switches increase effi ciency and eliminate the need for external Schottky diodes. Low output voltages are easily supported with the 0.8V feedback reference voltage.

The LTC3544B is available in a low profi le (0.75mm) (3mm × 3mm) QFN package.




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