LTC3636 Ver la hoja de datos (PDF) - Linear Technology

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LTC3636

Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator

Linear Technology 

Features

n Wide VIN Range: 3.1V to 20V

n Wide VOUT Range:

0.6V to 5V (LTC3636)

1.8V to 12V (LTC3636-1)

n Output Current per Channel: 6A

n High Efficiency: Up to 95%

n Die Temperature Monitor

n Adjustable Switching Frequency: 500kHz to 4MHz

n External Frequency Synchronization

n Current Mode Operation for Excellent Line and

Load Transient Response

n 0.6V Reference Allows Low Output Voltages

n User Selectable Burst Mode® Operation or Forced

Continuous Operation

n Output Voltage Tracking and Soft-Start Capability

n Short-Circuit Protected

n Overvoltage Input and Overtemperature Protection

n Power Good Status Outputs

n Low Profile 4mm × 5mm 28-Lead QFN Package

Applications

n Distributed Power Systems

n Battery-Powered Instruments

n Point-of-Load Power Supplies

LTC3636/LTC3636-1

Dual Channel 6A, 20V

Monolithic Synchronous

Step-Down Regulator

Description

The LTC®3636/LTC3636-1 is a high efficiency, dual-channel

monolithic synchronous buck regulator using a controlled

on-time current mode architecture, with phase lockable

switching frequency. The operating supply voltage range is

from 3.1V to 20V, making it suitable for lithium-ion battery

stacks as well as point of load power supply applications

from a 12V or 5V input.

The operating frequency is programmable from 500kHz to

4MHz with an external resistor and may be synchronized

to an external clock signal. The high frequency capability

allows the use of small surface mount inductors and

capacitors. The unique constant frequency/controlled

on-time architecture is ideal for high step-down ratio ap-

plications that operate at high frequency while demanding

fast transient response.

The LTC3636/LTC3636-1 can select between forced con-

tinuous mode and high efficiency Burst Mode operation.

The LTC3636 and LTC3636-1 differ in their output voltage

sense range.

L, LT, LTC, LTM, Burst Mode, Silent Switcher, Linear Technology and the Linear logo are

registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066,

6476589, 6774611.

Typical Application

VIN

10V TO 20V

47µF

x2

VOUT2

5V AT 6A

47µF

22pF

0.1µF

0.56µH

73.2k

10k

RUN1

RUN2

VIN2 VIN1

INTVCC

LTC3636/

ITH1

LTC3636-1 ITH2

RT

TMON

MODE/SYNC

TRACKSS2

TRACKSS1

PGOOD2

PGOOD1

BOOST2

BOOST1

SW2

SW1

VFB2

GND

VFB1

4.7µF

0.1µF

0.56µH

45.3k

10k

47µF

22pF

VOUT1

3.3V AT 6A

3636 TA01a

For more information www.linear.com/LTC3636

Efficiency vs Load Current

100

97

fSW = 2MHz

VIN = 12V

94

91

88

85

82

79

76

73

VOUT = 5V

VOUT = 3.3V

70

0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6.0

LOAD CURRENT (A)

3636 TA01b

3636fa

1

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