LTM4630Y Просмотр технического описания (PDF) - Linear Technology
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LTM4630Y Datasheet PDF : 34 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 LTM4630 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4630E 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
LTM4630I 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.
LTM4630
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 400kHz to 750kHz.
Note 5: LTM4630 device is designed to operate from 400kHz to 750kHz
Note 6: These parameters are tested at wafer sort.
Note 7: See output current derating curves for different VIN, VOUT and TA.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
VIN = 5V, fS = 450kHz
100
Efficiency vs Output Current,
VIN = 12V, fS = 450kHz
95
Dual Phase Single Output Efficiency
vs Output Current, VIN = 12V,
fS = 450kHz
95
95
90
85
80
VOUT = 1V
VOUT = 1.2V
VOUT = 1.5V
VOUT = 1.8V
75
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630 G01
90
85
80
75
VOUT = 1V
70
VOUT = 1.2V
VOUT = 1.5V
VOUT = 1.8V
65
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630 G02
90
85
80
75
VOUT = 1V
70
VOUT = 1.2V
VOUT = 1.5V
65
VOUT = 1.8V
0 5 10 15 20 25 30 35 40
LOAD CURRENT (A)
4630 G03
Burst Mode and Pulse-Skip Mode
Efficiency VIN=12V, VOUT = 1.2V,
fS = 450kHz
100
CCM
Burst Mode OPERATION
90
PULSE-SKIP MODE
80
70
1V Single Phase Output Load
Transient Response
VOUT(AC)
50mV/Div
1.2V Single Phase Output Load
Transient Response
VOUT(AC)
50mV/Div
60
50
40
30
0.01
0.1
1
10
LOAD CURRENT (A)
4630 G04
LOAD STEP
2A/DIV
20µs/DIV
4630 G05
12VIN, 1VOUT, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
COUT = 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
LOAD STEP
2A/DIV
20µs/DIV
4630 G06
12VIN, 1.2VOUT, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
COUT = 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
4630fa
For more information www.linear.com/LTM4630
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