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LTM4646

4646f

For more information www.linear.com/LTM4646

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

operating temperature range (Note 2). Specified as each individual output channel. TA = 25°C, VIN = 12V and VRUN1, VRUN2 at 5V

unless otherwise noted. Per the typical application in Figure 18.

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 LTM4646 is tested under pulsed load conditions such

that TJ ≈ TA. The LTM4646E is guaranteed to meet specifications from

0°C to 125°C internal temperature. Specifications over the –40°C to

125°C internal operating temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTM4646I is guaranteed over the full –40°C to 125°C internal operating

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors.

Note 3: Two outputs are tested separately and the same testing condition

is applied to each output.

Note 4: The switching frequency is programmable from 250kHz to 1.3MHz.

Note 5: LTM4646 device is optimized to operate from 300kHz to 750kHz.

Note 6: These parameters are tested at wafer sort.

Note 7: See output current derating curves for different VIN, VOUT and TA.

Note 8: For 6V ≤ VIN ≤ 20V, the 3.3 to 5V output current needs to be

limited to 9A/channel. All other input and output combinations are 10A/

channel with recommended switching frequency included in the efficiency

graphs. Derating curves and airflow apply.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fSYNC

(Each Channel)

Frequency SYNC Capture Range

MODE_PLLIN Clock Duty Cycle = 50%

250

1300

kHz

VRNG ILIMIT

SET Current Limit

Per Channel

VRNG = INTVCC, IOUT to 10A, ILIMIT ~22A

VRNG = SGND, IOUT to 5A, ILIMIT ~11A

tD(PGOOD)

Delay from VFB Fault (OV/UV) to

PGOOD Falling

(Note 6)

tD(PGOOD)

Delay from VFB Fault (OV/UV Clear)

to PGOOD

(Note 6)

VTEMP1, VTEMP2

TEMP Diode Voltage

ITEMP = 100µA

0.598

TC VTEMP1,2

VTEMP Temperature Coefficient

–2.0

mV/°C

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