LTM4628
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
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:
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 V
IN
, V
OUT
and T
A
.
Typical perForMance characTerisTics
5V
IN
Efficiency
100
95
90
85
80
75
70
65
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
7
8
FREQ = 500kHz
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
55
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
1.2V
OUT
0.8V
OUT
7
8
12V
IN
Efficiency
FREQ = 500kHz, 700kHz for 3.3V AND 5V
95
90
85
80
75
70
65
60
55
50
24V
IN
Efficiency
FREQ = 500kHz, 700kHz for 3.3V AND 5V
5V
OUT
3.3V
OUT
2.5V
OUT
1.5V
OUT
0
1
4
5
2
3
6
OUTPUT CURRENT (A)
7
8
4628 G01
4628 G02
4628 G03
Burst Mode Pulse-Skipping
Efficiency
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.001
0.01
PULSE-SKIPPING MODE
I
OUT
2A/DIV
Burst Mode OPERATION
V
OUT
50mV/DIV
0.8V Load Transient
1.2V Load Transient
V
OUT
50mV/DIV
I
OUT
2A/DIV
4628 G05
100µs/DIV
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
100µs/DIV
4628 G06
1
0.1
OUTPUT CURRENT (A)
10
4628 G04
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
4628fd
5
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
