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QM48T45 Family DC-DC Converter Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 45 A Output
Electrical Specifications: QM48T45025 (2.5 Volt Out)
Conditions: T A = 25 oC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 2.5 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
Input Stand-by Current
45 ADC, 2.5 VDC Out @ 36 VDC In
Vin = 48 V, converter disabled
3
3.6
ADC
mADC
Input No Load Current (0 load on the output) Vin = 48 V, converter enabled
67
mADC
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
25 MHz bandwidth
120 Hz
7.5
TBD
mA PK-PK
dB
Output Characteristics
Output Voltage Set Point (no load)
-40 oC to 85 oC
2.475
2.500
2.525
VDC
Output Regulation
Over Line
Over Load
±2
±2
±5
±5
mV
mV
Output Voltage Range
Over line, load and temperature
2.462
2.538
VDC
Output Ripple and Noise –
Full load + 10 μF tantalum + 1 μF
25 MHz bandwidth
External Load Capacitance
Output Current Range
ceramic
Plus full load (resistive)
0
30
50
40,000
45
mV PK-PK
μF
ADC
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Non-latching
Non-latching, Short = 10 m ? .
Non-latching
47.25
53
55
12
58
65
18
ADC
A
Arms
Dynamic Response
Load Change 25% of Iout Max, di/dt = 1A/ μ s Co = 470 μ F tantalum + 1 μ F ceramic
Settling Time to 1%
Efficiency
100% Load
50% Load
50
50
40
40
30
30
160
100
89.0
91.0
mV
μs
%
%
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 2.5V.1: Available load current vs. ambient air
Fig. 2.5V.2:
Available load current vs. ambient air
temperature and airflow rates for QM48T45025 converter
with B height pins mounted vertically with Vin = 48 V, air
flowing from pin 3 to pin 1, and MOSFET temperature ≤
120 ° C.
Note: NC – Natural convection
temperature and airflow rates for QM48T45025 converter
with B height pins mounted horizontally with Vin = 48 V, air
flowing from pin 3 to pin 1, and MOSFET temperature ≤
120 ° C.
MCD10073 Rev. 1.0
Page 12 of 36
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