LTC3720EGN

更新时间： 2024-02-14 18:10:40

品牌	Logo	应用领域
凌特 - Linear		开关光电二极管控制器
页数	文件大小	规格书
24页	294K
描述
Single Phase VRM8.5 Current Mode Step-Down Controller

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LTC3720EGN 数据手册

LTC3720

PI FU CTIO S

V_CC(Pin18):PowerSupplyVoltageforVID.Rangeisfrom

SENSE^–(Pin 24): Current Sense Comparator Input. The

(–) input is normally connected to PGND.

3.1V to 5.5V.

EXTV_CC(Pin 19): External V_CCInput. When EXTV_CCex-

ceeds 4.7V, an internal switch connects this pin to INTV_CC

and shuts down the internal regulator so that controller

andgatedrivepowerisdrawnfromEXTV_CC.Donotexceed

7V at this pin and ensure that EXTV_CC< V_IN.

SENSE⁺(Pin 25): Current Sense Comparator Input. The

(+) input to the current comparator is normally connected

to the SW node unless using a sense resistor (see Appli-

cations Information).

SW (Pin 26): Switch Node. The (–) terminal of the boot-

strap capacitor C_Bconnects here. This pin swings from a

diode voltage drop below ground up to V_IN.

V_IN(Pin 20): Main Input Supply. Decouple this pin to

PGND with an RC filter (1Ω, 0.1µF).

INTV_CC(Pin 21): Internal 5V Regulator Output. The driver

and control circuits are powered from this voltage. De-

couple this pin to power ground with a minimum of 4.7µF

low ESR tantalum capacitor.

TG (Pin 27): Top Gate Drive. Drives the top N-channel

MOSFET with a voltage swing equal to INTV_CCsuperim-

posed on the switch node voltage SW.

BOOST (Pin 28): Boosted Floating Driver Supply. The (+)

terminal of the bootstrap capacitor C_Bconnects here. This

pin swings from a diode voltage drop below INTV_CCup to

V_IN+ INTV_CC.

BG (Pin 22): Bottom Gate Drive. Drives the gate of the

bottom N-channel MOSFET between ground and INTV_CC.

PGND (Pin 23):Power Ground. Connect this pin closely to

the source of the bottom N-channel MOSFET, the (–)

terminal of C_VCCand the (–) terminal of C_IN.

3720f

1...4 5 678 9 10...24

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