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LTC3774

Dual, Multiphase Current Mode Synchronous Controller

Linear Technology 

LTC3774

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

Main Control Loop/Whole System

VIN

VOUT

VOSNS+

IOSNS+

VREFLNREG

VLOADREG

gm

f0dB

VOVL

IQ

DFMAX

UVLO

UVLOHYS

ISNSA+

ISNSD+

ISNS–

AVT_SNS

Input Voltage Range

Output Voltage Range

Regulated Feedback Voltage

Feedback Current

Reference Voltage Line Regulation

Output Voltage Load Regulation

Transconductance Amplifier gm

DA Unity-Gain Crossover Frequency

Feedback Overvoltage Lockout

Input DC Supply Current

Normal Mode

Shutdown

Maximum Duty Factor

Undervoltage Lockout

UVLO Hysteresis

Sense Pin Bias Currents

Sense Pin Bias Currents

Sense Pin Bias Currents

Total Sense Signal Gain to Current

Comparator

ITH = 1.2V (Note 3)

VIN = 4.5V to 38V

∆ITH = 1.2V to 0.7V

∆ITH = 1.2V to 1.6V

ITH = 1.2V, Sink/Source 5µA

(Note 5)

Measured at VOSNS+

(Note 4)

VRUN = 0V

In Dropout

VINTVCC Falling

VSNSA+ = 3.3V

VSNSD+ = 3.3V

VSNS– = 3.3V

4.5

l 0.6

l 595.5

l

l

l

5

600

–30

0.002

0.01

0.01

2

4

7.5

38

3.5

604.5

–100

0.01

0.1

0.1

10

9

40

60

96

98

3.5

3.75

4.0

500

±0.5

±2

30

10

5

V

V

mV

nA

%/V

%

%

mmho

MHz

%

mA

µA

%

V

mV

µA

nA

µA

V/V

ITEMP

ITK/SS

tSS(INTERNAL)

VHIZB

VHIZB_HYS

VRUN

VRUN_HYS

IRUN

DCR Tempco Compensation Current

Soft-Start Charge Current

Internal Soft-Start Time

HIZB Pin On Threshold

HIZB Pin On Hysteresis

RUN Pin On Threshold

RUN Pin On Hysteresis

RUN Pin Pull-Up Current

RUN < On Threshold

RUN > On Threshold

VITEMP = 0.5V

VTK/SS = 0V

VTK/SS = 5V

VHIZB Rising

VRUN Rising

RUN < 1.1V

RUN > 1.34V

l 27

30

33

µA

l

1

1.25

1.5

µA

600

µs

2.2

V

600

mV

l 1.1 1.22 1.34

V

80

mV

1

µA

5

µA

VSENSE(MAX)

Power Good

Maximum Current Sense Threshold

ITH = 2V, VSENSE = 3.3V

ILIM = 0V

ILIM = 1/4 INTVCC

ILIM = Float

ILIM = 3/4 INTVCC

ILIM = INTVCC

l 9.25 10.25 11.25

mV

l 14

15

16

mV

l 19

20

21

mV

l 24

25

26

mV

l 28.25 29.75 31.25

mV

VPGOOD(ON)

IPGOOD(OFF)

tPGOOD

VPGOOD

PGOOD Pull-Down Resistance

PGOOD Leakage Current

VPGOOD High to Low Delay

PGOOD Trip Level

VPGOOD = 5V

VOSNS+ with Respect to Set Output Voltage

VOSNS+ Ramping Up

VOSNS+ Ramping Down

90

200

Ω

–2

2

µA

45

µs

5

7.5

10

%

–5

–7.5

–10

%

3774f

For more information www.linear.com/LTC3774

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