LTM4628(RevC) 데이터 시트보기 (PDF) - Linear Technology
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LTM4628 Datasheet PDF : 36 Pages
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Electrical Characteristics
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 LTM4628 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4628E 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
LTM4628I 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.
LTM4628
Note 3: Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4: The switching frequency is programmable for 400kHz to 750kHz.
Note 5: LTM4628 device is designed to operate from 400kHz to 750kHz
Note 6: 100% tested at wafer level.
Note 7: See output current derating curves for different VIN, VOUT and TA.
Typical Performance Characteristics
5VIN Efficiency
100 FREQ = 500kHz
95
90
85
80
75
3.3VOUT
2.5VOUT
70
1.5VOUT
1.2VOUT
0.8VOUT
65
012345678
OUTPUT CURRENT (A)
4628 G01
12VIN Efficiency
100 FREQ = 500kHz, 700kHz for 3.3V AND 5V
95
90
85
80
75
70
5VOUT
3.3VOUT
65
2.5VOUT
1.5VOUT
60
1.2VOUT
0.8VOUT
55
012345678
OUTPUT CURRENT (A)
4628 G02
24VIN Efficiency
95 FREQ = 500kHz, 700kHz for 3.3V AND 5V
90
85
80
75
70
65
60
5VOUT
3.3VOUT
55
2.5VOUT
50
1.5VOUT
012345678
OUTPUT CURRENT (A)
4628 G03
Burst Mode Pulse-Skipping
Efficiency
0.8V Load Transient
1.2V Load Transient
100
90
Burst Mode OPERATION
80
70
VOUT
50mV/DIV
VOUT
50mV/DIV
60
50
40
30
20
10
0
0.001
PULSE-SKIPPING MODE
0.01
0.1
1
OUTPUT CURRENT (A)
10
4628 G04
IOUT
2A/DIV
IOUT
2A/DIV
100µs/DIV
4628 G05
12VIN, 0.8VOUT, 0A TO 4A LOAD STEP AT 4A/µs
COUT1 4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 400kHz
CFF CAPACITOR = 47pF
100µs/DIV
4628 G06
12VIN, 1.2VOUT, 0A TO 4A LOAD STEP AT 4A/µs
COUT1, 4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 500kHz
CFF CAPACITOR = 47pF
4628fc
5
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