Datasheet LTM4636 (Analog Devices) - 5

LTM4636
e lecTrical characTerisTics The
l
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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Temperature Diode
Diode VF Diode Forward Voltage I = 100µA, TEMP+ to TEMP– 0.598 V TC Temperature Coefficient l –2.0 mV/°C
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings maximum ambient temperature consistent with these specifications is may cause permanent damage to the device. Exposure to any Absolute determined by specific operating conditions in conjunction with board Maximum Rating condition for extended periods may affect device layout, the rated package thermal resistance and other environmental reliability and lifetime. factors.
Note 2:
The LTM4636 is tested under pulsed load conditions such that
Note 3:
The minimum on-time condition is specified for a peak-to-peak TJ ≈ TA. The LTM4636E is guaranteed to meet performance specifications inductor ripple current of ~40% of IMAX Load. (See the Applications over the 0°C to 125°C internal operating temperature range. Specifications Information section) over the full –40°C to 125°C internal operating temperature range are
Note 4:
See output current derating curves for different VIN, VOUT and TA. assured by design, characterization and correlation with statistical process
Note 5:
Guaranteed by design. controls. The LTM4636I is guaranteed to meet specifications over the
Note 6:
100% tested at wafer level. full –40°C to 125°C internal operating temperature range. Note that the
Typical perForMance characTerisTics Efficiency vs Load Current Efficiency vs Load Current with Efficiency vs Load Current with with 5VIN 8VIN 12VIN
100 100 100 95 95 95 90 90 90 85 85 85 EFFICIENCY (%) 80 3.3VOUT, 500kHz EFFICIENCY (%) 3.3VOUT, 700kHz EFFICIENCY (%) 3.3VOUT, 750kHz 2.5V 80 80 OUT, 500kHz 2.5VOUT, 600kHz 2.5VOUT, 650kHz 1.8VOUT, 450kHz 1.8VOUT, 500kHz 1.8VOUT, 600kHz 75 1.5VOUT, 425kHz 75 1.5VOUT, 450kHz 75 1.5VOUT, 550kHz 1.2VOUT, 300kHz 1.2VOUT, 400kHz 1.2VOUT, 400kHz 1VOUT, 300kHz 1VOUT, 350kHz 1VOUT, 350kHz 70 70 70 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) OUTPUT CURRENT (A) 4636 G01 4636 G02 4636 G03
Burst Mode Efficiency vs Load Current 1V Transient Response 1.2V Transient Response
100 Burst Mode OPERATION V 50mV/DIV 50mV/DIV IN 12V 90 V 50µs/DIV 50µs/DIV OUT 1.5V 80 10A/DIV 18A/µs 10A/DIV STEP 18A/µs 70 STEP 4636 G05 4636 G06 EFFICIENCY (%) 60 12V TO 1V TRANSIENT RESPONSE 12V TO 1.2V TRANSIENT RESPONSE COUT = 4 × 100µF CERAMIC, 3 × 470µF 2.5V COUT = 4 × 100µF CERAMIC, 3 × 470µF 2.5V POSCAP 5mΩ POSCAP 5mΩ 50 CFF = 22pF, SW FREQ = 400kHz CFF = 22pF, SW FREQ = 400kHz CCOMP = 100pF 40 0 1 2 3 4 5 OUTPUT CURRENT (A) 4636 G04 4636f For more information www.linear.com/LTM4636 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Typical Application Design Resources Related Parts