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VTM
V•I ChipTM – VTM
Voltage Transformation Module
V048K015T090
K indicates BGA configuration. For other
mounting options see Part Numbering below.
• 48 V to 1.5 V V•I Chip Converter
• 90 A (135 A for 1 ms)
• High density – 360 A/in3
• 125°C operation
• 1 µs transient response
• >3.5 million hours MTBF
Vf = 26 - 55 V
VOUT = 0.8 - 1.7 V
IOUT = 90 A
K = 1/32
ROUT = 1.2 mmax
©
• Small footprint – 84 A/in2
• Typical efficiency 93% at 1.5 V/50 A
• Low weight – 0.5 oz (14 g)
• No output filtering required
• Pick & Place / SMD
• BGA or J-Lead packages
Actual size
Product Description
Absolute Maximum Ratings
The V048K015T090 VI Chip Voltage Transformation
Module (VTM) breaks records for speed, density and
Parameter
Values
Unit
Notes
efficiency to meet the demands of advanced DSP,
FPGA, ASIC, processor cores and microprocessor
applications at the point of load (POL) while providing
+In to -In
+In to -In
-1.0 to 60.0
Vdc
100 Vdc For 100 ms
isolation from input to output. It achieves a response
PC to -In
-0.3 to 7.0
Vdc
time of less than 1 µs and delivers up to 90 A in a
TM to -In
-0.3 to 7.0
Vdc
volume of less than 0.25 in3 while providing low output
voltages with unprecedented efficiency. It may be
paralleled to deliver hundreds of amps at an output
voltage settable from 0.8 to 1.7 Vdc.
P R E L I M I N A RYThe VTM V048K015T090’s nominal output voltage is
1.5 Vdc from a 48 Vdc input factorized bus, Vf, and is
controllable from 0.8 to 1.7 Vdc at no load, and from
0.8 to 1.6 Vdc at full load, over a Vf input range of 26
to 55 Vdc. It can be operated either open- or closed-loop
depending on the output regulation needs of the
application. Operating open-loop, the output voltage
tracks its Vf input voltage with a transformation ratio,
K = 1/32, and an output resistance, ROUT = 1.0 milliohm, to
enable applications requiring a programmable low
output voltage at high current and high efficiency.
VC to -In
-0.3 to 19.0
Vdc
+Out to -Out
-0.1 to 4.0
Vdc
Isolation voltage
Operating junction temperature
2,250
-40 to 125
Vdc Input to Output
°C See Note
Output current
90 A Continuous
Peak output current
Case temperature during reflow
135
208
A For 1 ms
°C
Storage temperature
-40 to 150
°C
Output power
Peak output power
145 W Continuous
217 W For 1 ms
Note: The referenced junction is defined as the semiconductor having the highest temperature.
This temperature is monitored by the temperature monitor (TM) signal and by a shutdown comparator.
Closing the loop back to an input Pre-Regulation
Module (PRM) or DC-DC converter can compensate
for ROUT.
Part Numbering
The 1.5 V VTM achieves break-through current density
of 360 A/in3 in a VI Chip package compatible with
standard pick-and-place and surface mount assembly
processes. The VI Chip BGA package supports in-board
mounting with a low profile of 0.16" (4 mm) over the
board. A J-lead package option supports on-board
surface mounting with a profile of only 0.25" (6 mm)
over the board. The VTM’s fast dynamic response and
low noise eliminate the need for bulk capacitance at the
load, substantially increasing the POL density while
improving reliability and decreasing cost.
V 048
Voltage
Transformation
Module
Input Voltage
Designator
K
Configuration Options
A = On-board, elevated (Fig.16)
F = On-board (Fig.15)
K = In-board (Fig.14)
015 T 090
Output Voltage
Designator
(=VOUT x10)
Output Current
Designator
(=IOUT)
Product Grade Temperatures (°C)
Grade Storage Operating
T -40 to150 -40 to125
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
V•I Chip Voltage Transformation Module V048K015T090 Rev. 1.0
Page 1 of 16

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Specifications
INPUT (Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Input voltage range
Input dV/dt
Input overvoltage turn-on
Input overvoltage turn-off
Input current
Input reflected ripple current
No load power dissipation
Internal input capacitance
Internal input inductance
Min Typ Max Unit
Note
26 48 55 Vdc Operable down to zero V with external bias voltage
1 V/µs
57.6 Vdc
59.0 Vdc
3.2 Adc
135
mA p-p
Using test circuit in Fig.17; See Fig.1
2.50 3.5
W
4 µF
20 nH
OUTPUT (Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Rated DC current
P R E L I M I N A RYPeakrepetitivecurrent
DC current limit
Current share accuracy
Efficiency
Half load
Full load
Internal output inductance
Internal output capacitance
Load capacitance
Output overvoltage setpoint
Min Typ Max Unit
0 90 Adc
135 A
92 108 126 Adc
5 10 %
92.5 93.4
%
91.0 91.5
%
1.6 nH
306 µF
100,000
µF
1.80 Vdc
Note
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
See Parallel Operation on page 10
See Fig.3, 1.5 Vout
See Fig.3, 1.5 Vout
Effective value
Output ripple voltage
No external bypass
62 110 mV
See Figs.2 and 5
200 µF bypass capacitor
2 mV See Fig.6
Effective switching frequency
2.4 2.5
2.6 MHz
Fixed, 1.25 MHz per phase
Line regulation
K
0.0309
1/32 0.0316
VOUT = K•VIN at no load
Load regulation
ROUT
1.0 1.2 m
See Fig.20
Transient response
Voltage overshoot
20 mV 90 A load step with 100 µF CIN; See Figs.7 and 8
Response time
200 ns See Figs.7 and 8
Recovery time
1 µs See Figs.7 and 8
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
V•I Chip Voltage Transformation Module V048K015T090 Rev. 1.0
Page 2 of 16

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Specifications
WAVEFORMS
Figure 1— Input reflected ripple current at full load and 48 Vin
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
Output Ripple vs Load
10 20 30 40 50 60 70 80 90
Output Current (A)
Figure 2— Output voltage ripple vs. output current at 1.5 Vout
with no POL bypass capacitance.
Efficiency vs. Output Current
95
93 1.6V
91 1.5V
1.2V
89
1.0V
87 0.8V
85
83
81
79
77
75
0 10 20 30 40 50 60 70 80 90
Output Current (A)
Figure 3— Efficiency vs. output current and output voltage
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Power Dissipation vs. Output Current
10 20 30 40 50 60 70 80
Output Current (A)
1.5V
1.2V
1.0V
0.8V
90
Figure 4—Power dissipation as a function of output current and
output voltage
Figure 5— Output voltage ripple at full load and 1.5 Vout;
without any external bypass capacitor.
Figure 6—Output voltage ripple at full load and 1.5 Vout with
200 µF ceramic external bypass capacitance and 20 nH
distribution inductance.
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
V•I Chip Voltage Transformation Module V048K015T090 Rev. 1.0
Page 3 of 16