LTM4656 datasheet(4/28 Pages) AD

4 / 28 page

LTM4656/LTM4656-1

Rev. 0

For more information www.analog.com

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VRUN

RUN Pin ON Threshold

VRUN Rising

1.18

1.28

1.38

VRUNHYS

RUN Pin ON Hysteresis

100

In-Line Protection Control Section

SHDN

Active Low Shutdown

4V to 36V Input

Threshold

0.6

0.385

1.4

1.7

2.1

SHDN Reset

SHDN Reset Time

SHDN = 0.4V (Note 6)

100

µs

UV Threshold

Undervoltage Lockout

UV Lockout Threshold, VIN =12V

1.24 1.275 1.31

UV Hysteresis

UV Input Hysteresis

VIN > 4.5V, Nominal 12V (Note 6)

UV IN

UV Input Current

UV =1 .275V (Note 6)

±0.3

±1

µA

VTMR(F)

TMR Fault Threshold

TMR Rising (Note 6)

1.275

VTMR(G)

TMR Gate Off Threshold

TMR Rising

1.375

VTMR(H)

TMR Cooldown High Threshold

VIN = 12V to 24V, TMR Rising

4.3

TMR OVER I (5V)

TMR Overcurrent tVDS = 5V

VIN, SHDN, UV = 5V, VFB = 24.3k, 12V VOUT Shorted

800

µs

TMR OVER I (12V)

TMR Overcurrent tVDS = 12V

VIN, SHDN, UV =12V, VFB = 11.5k, 24V VOUT Shorted

220

µs

TMR OVER I (24V)

TMR Overcurrent tVDS = 24V

VIN, SHDN, UV = 24V, VFB = 7.5k, 36V VOUT Shorted

150

µs

ILEAK(FLT)

FLT Pin Leak

FLT = 36V

±2.5

µA

VIN – BVIN Rising Delta Path Fully Enhanced

Delta VIN – BVIN Enhancing, Boost RUN Pin Enabled l 0.25

0.5

0.75

VIN – BVIN Falling Delta Path Being Opened

Delta VIN – BVIN Opening, Boost RUN Pin Pulled Low

2.7

Retry Duty Cycle, Shorted Output

VIN = 12V, VOUT = 0V, Referenced to BVIN

tOFF(UV)

Undervoltage Turn-Off Propagation Delay UV Steps from 1.5V to 1V (Note 6)

µs

VOL(FLT)

FLT Output Low

ISINK =100µA

0.3

0.8

PGOOD Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.3

IPGOOD(LEAK)

PGOOD Leakage Current

VPGOOD = 6V

±1

μA

VPG

PGOOD Trip Level

VFB with Respect to Set Regulated Voltage

VFB Ramping Negative

VFB Ramping Positive

–12

–10

–8

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified operating

temperature range, otherwise specifications are at TA = 25°C. (Note 2), VIN = 12, VBIAS = BVIN, SHDN = VIN per the typical application,

or otherwise specified in the table.

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 LTM4656 is tested under pulsed load conditions such

that TJ ≈ TA. The LTM4656E is guaranteed to meet performance

specifications over the 0°C to 125°C internal operating temperature

range. Specifications over the full –40°C to 125°C internal operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTM4656I is guaranteed to meet

specifications 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 resistance and

other environmental factors.

Note 3: The minimum on-time condition is specified for a peak-to-

peak inductor ripple current of ~40% of IMAX Load. (See Applications

Information section)

Note 4: See output current derating curves for different VIN, VOUT and TA.

Note 5: Guaranteed by design.

Note 6: 100% tested at wafer level.

Note 7: JEDEC board θ values are determined by simulation per JESD51

conditions. Demo board θ values are obtained with demo board. Refer

to Figure 9 to Figure 17 and Table 2 to Table 5 for lab ameasurement and

derating information.

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