LTC7803 datasheet(42/42 Pages) AD

42 / 42 page

LTC7811

Rev. 0

For more information www.analog.com



ANALOG DEVICES, INC. 2021

03/21

www.analog.com

RELATED PARTS

TYPICAL APPLICATION

Figure 12. High Efficiency Wide Input Range 2.25MHz Dual 3.3V/5V Regulator with Spread Spectrum

PART NUMBER DESCRIPTION

COMMENTS

LTC7818

40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost

Synchronous Controller with Spread Spectrum

4.5V ≤ VIN ≤ 40V, IQ = 14µA, 100% Duty Cycle Capable Boost

Buck and Boost VOUT Up to 40V, PLL Fixed Frequency 100kHz to 3MHz

LTC7817

40V Low IQ, 3MHz Triple Output

Buck/Buck/Boost Synchronous Controller

4.5V(Down to 2.5V after Start-up) ≤ VIN ≤ 38V, IQ = 28µA

Buck VOUT Range: 0.8V to 24V, Boost VOUT Up to 60V

LTC7802

40V Low IQ, Dual, 2-Phase

Synchronous Step-Down Controller

4.5V≤ VIN ≤ 40V, 0.8V ≤ VOUT ≤ 0.99VIN, IQ = 14µA

PLL Fixed Operating Frequency 100kHz to 3MHz

LTC7803

40V Low IQ, 3MHz 100% Duty Cycle Synchronous

Step-Down Controller

4.4V≤ VIN ≤ 40V, 0.8V ≤ VOUT ≤ 40V, IQ = 12µA

PLL Fixed Operating Frequency 100kHz to 3MHz

LTC7804

40V Low IQ 3MHz Synchronous Boost Controller

100% Duty Cycle Capable

4.5V(Down to 1V after Start-up) ≤ VIN ≤ 40V, VOUT up to 40V, IQ = 14µA

PLL Fixed Frequency 100kHz to 3MHz, 3mm x 3mm QFN-16, MSOP-16E

LTC3859AL

38V Low IQ, Triple Output, Buck/Buck/Boost Synchronous

Controller PLL Fixed Operating Frequency 50kHz to 900kHz

4.5V (Down to 2.5V After Start-Up) ≤ VIN ≤ 38V, IQ = 28μA

Buck VOUT Range: 0.8V to 24V, Boost VOUT Up to 60V

LTC3899

60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous

Controller PLL Fixed Operating Frequency 50kHz to 900kHz

4.5V (Down to 2.2V After Start-Up) ≤ VIN ≤ 60V, IQ = 28μA

Buck & Boost VOUT Up to 60V

LTC7801

150V Low IQ, Synchronous Step-Down DC/DC Controller

with 100% Duty Cycle

4V ≤ VIN ≤ 150V, 0.8V ≤ VOUT ≤ 60V, IQ = 40µA

PLL Fixed Frequency 50kHz to 900kHz

LTC3892

60V Low IQ, Dual 2-Phase Synchronous Step-Down

Controller with Adjustable Gate Drive Voltage

4.5V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ 0.99VIN, IQ = 50μA

PLL Fixed Frequency 50kHz to 900kHz

1nF

0.16µH

10µF

0.1µF

100

4.7µF

150µF

10µF

68µF

50V

0.1µF

357k

68.1k

7811 TA07

10µF

47pF

68.1k

4.7µF

220pF

6.8nF

7.68k

47pF

2.2nF

12.4k

47pF

680pF

9.3k

1nF

0.1µF

220µF

63V

215k

0.16µH

0.33µH

1V TO 38V*

(>5V START-UP)

LTC7811

VBIAS

BG3

SENSE3+

VFB3

ITH1

SENSE3–

SW1

BG1

TG1

BOOST1

SENSE1+

VFB1

SENSE1–

VIN

VOUT1

3.3V / 10A

VOUT3

8V WHEN VIN<8V

FOLLOWS VIN WHEN VIN>8V

SW2

BG2

TG2

BOOST2

SENSE2+

VFB2

SENSE2–

EXTVCC

VOUT2

5V/7A

INTVCC

FREQ

PLLIN/SPREAD

VOUT3

MODE

VPRG3

BATTSNS

BATTGOOD

GND

INTVCC

RUN1 RUN2 RUN3

TRACK/SS1

TRACK/SS2

SS3

ITH2

ITH3

INTVCC

PGOOD1

MTOP1,2: VISHAY SiR836DP

MBOT1,2: VISHAY SiR836DP

MBOT3: VISHAY SiR640DP

D3: ON SEMI MBR1240MFS

D1,2: CENTRAL SEMI CMDSH-4E

MTOP1

MBOT1

MTOP2

MBOT2

MBOT3

L1,3: COILCRAFT XAL5030-161ME

L2: COILCRAFT XAL5030-331ME

CIN: SUNCON 63CE220LX

COUT1: KEMET T520B157M004ATE015

COUT3: PANASONIC 50SVPF68M

COUT2: KEMET T520B107M006APE070

* WHEN VIN < 4V, MAXIMUM COMBINED LOAD CURRENT AVAILABLE IS REDUCED

* OUTPUT CURRENT CAPABILITY AT HIGH INPUT VOLTAGES MAY BE LIMITED BY THE THERMAL

CHARACTERISTICS OF THE OVERALL SYSTEM AND PRINTED CIRCUIT BOARD DESIGN

CIN

COUT3

COUT1

fSW=2.25MHz

IMON3

1nF

COUT2

100µF

6.3V

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