LTC3778 查看數據表（PDF） - Linear Technology

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LTC3778

Wide Operating Range, No RSENSE™ Step-Down Controller

Linear Technology 

LTC3778

ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

VRUN/SS(ON)

RUN Pin Start Threshold

VRUN/SS(LE)

RUN Pin Latchoff Enable Threshold

VRUN/SS(LT)

RUN Pin Latchoff Threshold

IRUN/SS(C)

Soft-Start Charge Current

IRUN/SS(D)

Soft-Start Discharge Current

VIN(UVLO)

Undervoltage Lockout Threshold

VIN(UVLOR)

Undervoltage Lockout Threshold

TG RUP

TG Driver Pull-Up On Resistance

TG RDOWN

TG Driver Pull-Down On Resistance

BG RUP

BG Driver Pull-Up On Resistance

BG RDOWN

BG Driver Pull-Down On Resistance

TG tr

TG Rise Time

TG tf

TG Fall Time

BG tr

BG Rise Time

BG tf

BG Fall Time

Internal VCC Regulator

VINTVCC

Internal VCC Voltage

∆VLDO(LOADREG) Internal VCC Load Regulation

VEXTVCC

EXTVCC Switchover Voltage

∆VEXTVCC

EXTVCC Switch Drop Voltage

∆VEXTVCC(HYS) EXTVCC Switchover Hysteresis

PGOOD Output

RUN/SS Pin Rising

RUN/SS Pin Falling

VIN Falling

VIN Rising

TG High

TG Low

BG High

BG Low

CLOAD = 3300pF

CLOAD = 3300pF

CLOAD = 3300pF

CLOAD = 3300pF

6V < VIN < 30V, VEXTVCC = 4V

ICC = 0mA to 20mA, VEXTVCC = 4V

ICC = 20mA, VEXTVCC Rising

ICC = 20mA, VEXTVCC = 5V

q 0.8

1.5

2

V

4

4.5

V

3.5

4.2

V

– 0.5 – 1.2

–3

µA

0.8

1.8

3

µA

q

3.4

3.9

V

q

3.5

4

V

2

3

Ω

2

3

Ω

3

4

Ω

1

2

Ω

20

ns

20

ns

20

ns

20

ns

q 4.7

5

5.3

V

– 0.1

±2

%

q 4.5

4.7

V

150 300

mV

200

mV

∆VFBH

∆VFBL

∆VFB(HYS)

VPGL

PGOOD Upper Threshold

PGOOD Lower Threshold

PGOOD Hysteresis

PGOOD Low Voltage

VFB Rising

VFB Falling

VFB Returning

IPGOOD = 5mA

7.5

10

12.5

%

– 7.5 – 10 – 12.5

%

1

2.5

%

0.15

0.4

V

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: TJ is calculated from the ambient temperature TA and power

dissipation PD as follows:

LTC3778E: TJ = TA + (PD • 110°C/W)

Note 3: The LTC3778 is tested in a feedback loop that adjusts VFB to achieve

a specified error amplifier output voltage (ITH).

Note 4: The LTC3778E is guaranteed to meet performance specifications from

0°C to 70°C. Specifications over the –40°C to 85°C operating temperature

range are assured by design, characterization and correlation with statistical

process controls.

3778f

3

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