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LTM4636

4636f

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elecTrical characTerisTics The

denotes the specifications which apply over the specified internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 12V, per the typical application in Figure 20.

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 LTM4636 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4636E 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 LTM4636I 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 the 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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Temperature Diode

Diode VF

Diode Forward Voltage

I = 100µA, TEMP+ to TEMP–

0.598

Temperature Coefficient

–2.0

mV/°C

Typical perForMance characTerisTics

Burst Mode Efficiency

vs Load Current

1V Transient Response

1.2V Transient Response

Efficiency vs Load Current

with 5VIN

Efficiency vs Load Current with

8VIN

Efficiency vs Load Current with

12VIN

OUTPUT CURRENT (A)

100

4636 G01

3.3VOUT, 500kHz

2.5VOUT, 500kHz

1.8VOUT, 450kHz

1.5VOUT, 425kHz

1.2VOUT, 300kHz

1VOUT, 300kHz

OUTPUT CURRENT (A)

100

4636 G02

3.3VOUT, 700kHz

2.5VOUT, 600kHz

1.8VOUT, 500kHz

1.5VOUT, 450kHz

1.2VOUT, 400kHz

1VOUT, 350kHz

OUTPUT CURRENT (A)

100

4636 G03

3.3VOUT, 750kHz

2.5VOUT, 650kHz

1.8VOUT, 600kHz

1.5VOUT, 550kHz

1.2VOUT, 400kHz

1VOUT, 350kHz

OUTPUT CURRENT (A)

100

4636 G04

Burst Mode OPERATION

VIN 12V

VOUT 1.5V

12V TO 1V TRANSIENT RESPONSE

COUT = 4 × 100µF CERAMIC, 3 × 470µF 2.5V

POSCAP 5m

CFF = 22pF, SW FREQ = 400kHz

10A/DIV

18A/µs

STEP

50mV/DIV

50µs/DIV

4636 G05

12V TO 1.2V TRANSIENT RESPONSE

COUT = 4 × 100µF CERAMIC, 3 × 470µF 2.5V

POSCAP 5m

CFF = 22pF, SW FREQ = 400kHz

CCOMP = 100pF

10A/DIV

18A/µs

STEP

50mV/DIV

50µs/DIV

4636 G06

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