Datasheet
LTM4628
5
4628fe
For more information www.linear.com/LTM4628
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
T
J
≈ T
A
. 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.
Note 3: Tw o 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 V
IN
, V
OUT
and T
A
.
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Pulse-Skipping
Efficiency 0.8V Load Transient 1.2V Load Transient
5V
IN
Efficiency 12V
IN
Efficiency 24V
IN
Efficiency
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
90
95
8
4628 G01
85
80
65
70
2
4
6
1
3
5
7
75
100
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
FREQ = 500kHz
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
90
95
8
4628 G02
85
80
55
70
2
4
6
1
3
5
7
75
60
65
100
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
FREQ = 500kHz, 700kHz for 3.3V AND 5V
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
85
90
8
4628 G03
80
75
50
65
2
4
6
1
3
5
7
70
55
60
95
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
FREQ = 500kHz, 700kHz for 3.3V AND 5V
12V
IN
, 0.8V
OUT
, 0A TO 4A LOAD STEP AT 4A/µs
C
OUT1
4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 400kHz
C
FF
CAPACITOR = 47pF
4628 G05
100µs/DIV
V
OUT
50mV/DIV
I
OUT
2A/DIV
12V
IN
, 1.2V
OUT
, 0A TO 4A LOAD STEP AT 4A/µs
C
OUT1
, 4× 100µF 6.3V X5R CERAMIC 1210 CASE SIZE
SWITCHING FREQUENCY 500kHz
C
FF
CAPACITOR = 47pF
4628 G06
V
OUT
50mV/DIV
I
OUT
2A/DIV
100µs/DIV
OUTPUT CURRENT (A)
0.001
EFFICIENCY (%)
70
80
90
101
4628 G04
60
50
0
30
0.1
0.01
40
10
20
100
PULSE-SKIPPING MODE
Burst Mode OPERATION
ELECTRICAL CHARACTERISTICS