LTM4608V 查看數據表（PDF） - Linear Technology

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LTM4608V

Low VIN, 8A DC/DC µModule Regulator with Tracking, Margining, and Frequency Synchronization

Linear Technology 

LTM4608

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

temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 5V unless otherwise noted. See Figure 1.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

IQ(VIN)

Input Supply Bias Current

VIN = 3.3V, VOUT = 1.5V, No Switching, MODE = VIN

400

µA

VIN = 3.3V, VOUT = 1.5V, No Switching, MODE = 0V

1.15

mA

VIN = 3.3V, VOUT = 1.5V, Switching Continuous

55

mA

VIN = 5V, VOUT = 1.5V, No Switching, MODE = VIN

VIN = 5V, VOUT = 1.5V, No Switching, MODE = 0V

VIN = 5V, VOUT = 1.5V, Switching Continuous

450

µA

1.3

mA

75

mA

Shutdown, RUN = 0, VIN = 5V

1

µA

IS(VIN)

Input Supply Current

VIN = 3.3V, VOUT = 1.5V, IOUT = 8A

VIN = 5V, VOUT = 1.5V, IOUT = 8A

4.5

A

2.93

A

Output Specifications

IOUT(DC)

Output Continuous Current Range VOUT = 1.5V

(See Output Current Derating

VIN = 3.3V, 5.5V

Curves for Different VIN, VOUT

VIN = 2.7V

and TA)

0

8

A

0

5

A

ΔVOUT(LINE)

Line Regulation Accuracy

VOUT = 1.5V, VIN from 2.7V to 5.5V, IOUT = 0A

l

0.1

0.2

%/V

VOUT

ΔVOUT(LOAD)

VOUT

Load Regulation Accuracy

VOUT = 1.5V

VIN = 3.3V, 5.5V, ILOAD = 0A to 8A

VIN = 2.7V, ILOAD = 0A to 5A

l

0.3

0.75

%

l

0.3

0.75

%

VOUT(AC)

Output Ripple Voltage

IOUT = 0A, COUT = 100µF/X5R/Ceramic, VIN = 5V,

VOUT = 1.5V

10

mVP-P

fS

Switching Frequency

IOUT = 8A, VIN = 5V, VOUT = 1.5V

1.3

1.5

1.7

MHz

fSYNC

SYNC Capture Range

0.75

2.25

MHz

ΔVOUT(START)

Turn-On Overshoot

COUT = 100µF, VOUT = 1.5V, IOUT = 0A

VIN = 3.3V

VIN = 5V

10

mV

10

mV

tSTART

Turn-On Time

COUT = 100µF, VOUT = 1.5V, VIN = 5V

IOUT =1A Resistive Load, Track = VIN

100

µs

ΔVOUT(LS)

Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load,

COUT = 100µF Ceramic, 100µF POSCAP,

VIN = 5V, VOUT = 1.5V

15

mV

tSETTLE

Settling Time for Dynamic Load Load: 0% to 50% to 0% of Full Load, VIN = 5V,

Step

VOUT = 1.5V, COUT = 100µF

10

µs

IOUT(PK)

Output Current Limit

COUT = 100µF

VIN = 2.7V, VOUT = 1.5V

VIN = 3.3V, VOUT = 1.5V

VIN = 5V, VOUT = 1.5V

8

A

11

A

13

A

Control Section

VFB

Voltage at FB Pin

IOUT = 0A, VOUT = 1.5V, VIN = 2.7V to 5.5V

0.592 0.596 0.600

V

l 0.589 0.596 0.603

V

SS Delay

Internal Soft-Start Delay

90

µs

IFB

VRUN

RUN Pin On/Off Threshold

RUN Rising

RUN Falling

0.2

µA

1.4

1.55

1.7

V

1.3

1.4

1.5

V

4608fc

3

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