LTC3521IFE 查看數據表（PDF） - Linear Technology

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LTC3521IFE

1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

Linear Technology 

LTC3521

Electrical Characteristics The l denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN, PVIN1, PVIN2 = 3.6V, VOUT1 = 3.3V, unless

otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Input Voltage

l 1.8

5.5

V

Quiescent Current—Shutdown

Burst Mode Quiescent Current

Oscillator Frequency

VSHDN1 = VSHDN2 = VSHDN3 = 0V (Note 6)

l

0.01

2

µA

VFB1 = 0.66V, VFB2 = 0.66V, VFB3 = 0.66V, VPWM = 0V

30

µA

l 0.85

1.1

1.35

MHz

SHDN1, SHDN2, SHDN3, PWM Input High Voltage

l 1.4

V

SHDN1, SHDN2, SHDN3, PWM Input Low Voltage

l

0.4

V

Power Good Outputs Low Voltage

Power Good Outputs Leakage Current

Buck Converters

IPGOOD1 = IPGOOD2 = IPGOOD3 = 1mA

VPGOOD1 = VPGOOD2 = VPGOOD3 = 5.5V

0.1

0.2

V

0.1

10

µA

PMOS Switch Resistance

0.205

Ω

NMOS Switch Resistance

0.170

Ω

NMOS Switch Leakage Current

PMOS Switch Leakage Current

Feedback Voltage

VSW2 = VSW3 = 5.5V, VIN = 5.5V

VSW2 = VSW3 = 0V, VIN = 5.5V

(Note 4)

0.1

5

µA

0.1

10

µA

l 0.585 0.6 0.612

V

Feedback Input Current

PMOS Current Limit

VFB2 = VFB3 = 0.6V

(Note 3)

1

50

nA

l 750 1050

mA

Maximum Duty Cycle

Minimum Duty Cycle

PGOOD Threshold

Power Good Hysteresis

Buck-Boost Converter

VFB2 = VFB3 = 0.55V

VFB2 = VFB3 = 0.66V

VFB2,3 Falling

VFB2,3 Returning Good

l 100

%

l

0

%

–12

–9

–6

%

2

%

Output Voltage

l 1.8

5.25

V

PMOS Switch Resistance

0.110

Ω

NMOS Switch Resistance

0.085

Ω

NMOS Switch Leakage Current

PMOS Switch Leakage Current

Feedback Voltage

VSW1A = VSW1B = 5.5V, VIN = 5.5V

VSW1A = VSW1B = 0V, VIN = 5.5V

(Note 4)

0.1

5

µA

0.1

10

µA

l 0.585 0.6 0.612

V

Feedback Input Current

Average Current Limit

VFB1 = 0.6V

(Note 3)

1

50

nA

l 1.65

2.1

A

Reverse Current Limit

(Note 3)

375

mA

Maximum Duty Cycle

Minimum Duty Cycle

PGOOD Threshold

Power Good Hysteresis

VFB1 = 0.55V

VFB1 = 0.66V

VFB1 Falling

VFB1 Returning Good

l 85

94

%

l

0

%

–12

–9

–6

%

3

%

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3521 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3521E is guaranteed to meet performance specifica-

tions from 0°C to 85°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3521I is guaranteed

over the full –40°C to 125°C operating junction temperature range. The

maximum ambient temperature is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors.

3521fb

For more information www.linear.com/LTC3521

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