LTM4609 datasheet(39/44 Pages) LINER

39 / 44 page

LTC7812

7812fc

For more information www.linear.com/LTC7812

TYPICAL APPLICATIONS

Figure 11. Wide Input Range Pass-Through Cascaded Boost+Buck Regulator

VIN

5V TO 38V

DOWN TO

2.5V AFTER

START-UP

CIN1

33µF

CIN2,3

6.8µF

1000pF

CB2

0.1µF

4.7µF

DB1

DB2

CB1

0.1µF

VOUT

10V TO 16V*

8A**

VMID, 10V***

RSENSE2

RSENSE1

L2, 1µH

MBOT2

MTOP2

MTOP1

MBOT1

L1, 4.7µH

RB1

499k

RA1

26.1k

FREQ

INTVCC

VFB2

RUN1

4.75k

4.7nF

CSS2

0.01µF

CSS1

0.1µF

100pF

EXTVCC

PGOOD1

OV2

SS2

ITH1

SGND

7812 F11a

RUN2

ITH2

SENSE2–

SENSE2+

VFB1

PGND

VBIAS

TG2

SW2 BOOST2

BG2

BG1

BOOST1 SW1

TG1

SENSE1+ SENSE1–

PLLIN/MODE

TRACK/SS1

LTC7812

6.8nF

820pF

CMID1,2,3,4

6.8µF

COUT3

47µF

COUT1,2

22µF

CMID5

33µF

RB2

499k

RA2

68.1k

INTVCC

PGOOD1

OV2

MTOP1, MTOP2, MBOT1, MBOT2: INFINEON BSC027N04LS

L1: WURTH 7443320470

L2: WURTH 7443320100

CIN1, CMID5: KEMET T521X336M050ATE075

COUT3: KEMET T521V476M020ATE055

DB1, DB2: CENTRAL SEMI CMDSH-4E

**WHEN VIN < 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED

***VMID = 10V WHEN VIN < 10V

VMID FOLLOWS VIN WHEN VIN > 10V

*VOUT = 10V WHEN VIN < 10V

VOUT = 16V WHEN VIN > 16V

VOUT FOLLOWS VIN WHEN VIN IS 10V TO 16V

7812 F11b

CISPR-25 CONDUCTED EMI MEASUREMENT

VIN = 13.5V, IOUT = 8A

FREQUENCY (MHz)

100

LTM4609 数据表(PDF) 39 Page - Linear Technology

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