LTM4650 datasheet(3/28 Pages) AD

3 / 28 page

LTM4660

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over specified internal

operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VINSNS = 54V, VOUT = 12V and EXTVCC = 12V

(see Note 4). Configured per Block Diagram circuit with no output load unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN(DC)

Input DC Voltage

VOUT(RANGE)

Output Voltage, Supported Range of

Regulation

VIN = 54V

4.5

VOUT(DC)

Output Voltage Variation

VOUT = 12V, IOUT = 15A (Notes 3, 5)

11.8

12.2

Input Specifications

VIN(UVLO)

Undervoltage Lockout Threshold

VIN Rising

Hysteresis

8.8

0.38

9.4

IS(VIN, FCM)

Input Supply Power Current, in Forced

Continuous Mode

MODE/PLLIN = 0V, IOUT = 0A (Note 6)

MODE/PLLIN = 0V, IOUT = 0.5A

150

IS(VIN, PS)

Input Supply Power Current, in Pulse-

Skipping Mode

MODE/PLLIN = INTVCC, IOUT = 0.5A

135

IS(VIN, BM)

Input Supply Power Current, in Burst Mode MODE/PLLIN = Open Circuit, IOUT = 0.5A

120

IS(VIN, SHUTDOWN) Input Supply Power Current in Shutdown

Shutdown, VRUN = 0V

300

μA

Output Specifications

IOUT(DC)

Output Continuous Current Range

(Note 3)

ΔVOUT/VOUT

Line Regulation Accuracy

30 ≤ VIN ≤ 60V, IOUT = 0A

0.003

0.2

%/V

Load Regulation Accuracy

IOUT =15A

30 ≤VIN ≤ 60V, 0A ≤ IOUT ≤ 25A (Note 7)

0.5

1.5

ΔVOUT(AC)

Output Voltage Ripple

150

mVP–P

VOUT Ripple Frequency

RFREQ = 61.9kΩ, IOUT = 0A

450

kHz

tStart-Up

Turn-On Start-Up Time

Capacitor Balancing – Delay Measured from

Toggling RUN on to MID Reaching VIN/2,

CTIMER = 1.47µF, CMID and CFLY = 10µF ×12

Delay Measured from MID Reaching VIN/2 to

PGOOD Exceeding 3V, CTRACK/SS = 0.1µF

300

ΔVOUT(LS)

Peak Output Voltage Deviation for Dynamic

Load Step

Load: 0W to 150W in 1μs and 150W to 0W in 1μs

COUT =150µF ×2, 10µF ×3 (Note 7)

0.3

tSETTLE

Settling Time for Dynamic Load Step

Load: 0W to 150W in 1μs and 150W to 0W in 1μs

COUT =150µF ×2, 10µF ×3 (Note 7)

300

µs

Control Section

VVFB

Regulated VFB Pin Feedback Voltage

IOUT = 0A, VOUT = 12V

0.792

0.8

0.808

IVFB

VFB Pin Leakage Current

(Note 8)

±10

ITRACK/SS

Soft-Start Charge Current

VTRACK/SS = 0V

–9

–10

–11

μA

Monitors

IVINSNS

VINSNS Bias Current

VRUN = 5V, Normal Mode

VRUN = 0V, Shutdown

μA

RUN Enable Pins

VRUN

RUN Turn-On Threshold

VRUN Rising

1.1

1.3

1.6

VRUN, HYS

RUN Hysteresis

100

IRUN

RUN Pull-Up Current

VRUN = 0V

μA

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