FEATURES
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LTM4600HV
10A, 28V
IN
High Efficiency
DC/DC µModule
DESCRIPTIO
The LTM
®
4600HV is a complete 10A, DC/DC step down
power supply with up to 28V input operation. Included
in the package are the switching controller, power FETs,
inductor, and all support components. Operating over
an input voltage range of 4.5V to 28V, the LTM4600HV
supports an output voltage range of 0.6V to 5V, set by a
single resistor. This high efficiency design delivers 10A
continuous current (12A peak), needing no heat sinks or
airflow to meet power specifications. Only bulk input and
output capacitors are needed to finish the design.
The low profile package (2.8mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. High switching frequency and an
adaptive on-time current mode architecture enables a very
fast transient response to line and load changes without
sacrificing stability. Fault protection features include
integrated overvoltage and short circuit protection with
a defeatable shutdown timer. A built-in soft-start timer is
adjustable with a small capacitor.
The LTM4600HV is packaged in a thermally enhanced,
compact (15mm
×
15mm) and low profile (2.8mm) over-
molded Land Grid Array (LGA) package suitable for auto-
mated assembly by standard surface mount equipment.
The LTM4600HV is Pb-free and RoHS compliant.
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation.
μModule
is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 28V
10A DC, 12A Peak Output Current
Parallel Two μModule™ DC/DC Converters for 20A
Output Current
0.6V to 5V Output Voltage
1.5% Output Voltage Regulation
Ultrafast Transient Response
Current Mode Control
–55°C to 125°C Operating Temperature Range
(LTM4600HVMPV)
Pb-Free (e4) RoHS Compliant Package Gold-Pad
Finish
Up to 92% Efficiency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Small Footprint, Low Profile (15mm × 15mm ×
2.8mm) LGA Package
APPLICATIO S
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Telecom and Networking Equipment
Military and Avionics Systems
Industrial Equipment
Point of Load Regulation
Servers
TYPICAL APPLICATIO
Efficiency vs Load Current with 24V
IN
(FCB = 0)
100
10A μModule Power Supply with 4.5V to 28V Input
V
IN
C
IN
V
OUT
C
OUT
EFFICIENCY (%)
V
IN
4.5V TO 28V
ABSMAX
V
OUT
2.5V*
10A
90
80
70
60
50
40
30
0
2
4
6
LOAD CURRENT (A)
1.8V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
8
10
4600HV TA01b
LTM4600HV
V
OSET
PGND SGND
31.6k
4600hv TA01a
*REVIEW DE-RATING CURVE AT
THE HIGHER INPUT VOLTAGE
U
U
U
4600hvfc
1
LTM4600HV
ABSOLUTE
(Note 1)
AXI U RATI GS
FCB, EXTV
CC
, PGOOD, RUN/SS, V
OUT
.......... –0.3V to 6V
V
IN
, SV
IN
, f
ADJ
............................................ –0.3V to 28V
V
OSET
, COMP ............................................. –0.3V to 2.7V
Operating Temperature Range (Note 2)
E and I Grades ..................................... –40°C to 85°C
MP Grade........................................... –55°C to 125°C
Junction Temperature ........................................... 125°C
Storage Temperature Range................... –55°C to 125°C
f
ADJ
SV
IN
EXTV
CC
V
OSET
COMP
SGND
RUN/SS
FCB
PGOOD
ORDER INFORMATION
LEAD FREE FINISH
LTM4600HVEV#PBF
LTM4600HVIV#PBF
LTM4600HVMPV#PBF
TAPE AND REEL
LTM4600HVEV#TRPBF
LTM4600HVIV#TRPBF
LTM4600HVMPV#TRPBF
PART MARKING
LTM4600HVEV
LTM4600HVIV
LTM4600HVMPV
PACKAGE DESCRIPTION
104-Lead (15mm
×
15mm
×
2.8mm)
104-Lead (15mm
×
15mm
×
2.8mm)
104-Lead (15mm
×
15mm
×
2.8mm)
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. External C
IN
= 120μF, C
OUT
= 200μF/Ceramic per typical
application (front page) configuration.
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
CONDITIONS
AbsMax 28V for Tolerance on 24V Inputs
FCB = 0V
V
IN
= 5V or 12V, V
OUT
= 1.5V, I
OUT
= 0A
●
ELECTRICAL CHARACTERISTICS
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Under Voltage Lockout Threshold
Input Inrush Current at Startup
I
OUT
= 0A
I
OUT
= 0A, V
OUT
= 1.5V, FCB = 0
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
I
OUT
= 0A, EXTV
CC
Open
V
IN
= 12V, V
OUT
= 1.5V, FCB = 5V
V
IN
= 12V, V
OUT
= 1.5V, FCB = 0V
V
IN
= 24V, V
OUT
= 2.5V, FCB = 5V
V
IN
= 24V, V
OUT
= 2.5V, FCB = 0V
Shutdown, RUN = 0.8V, V
IN
= 12V
3.4
0.6
0.7
0.8
1.2
42
1.8
36
35
100
400
Input Supply Current
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 10A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 10A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 10A
V
IN
= 24V to 3.3V at 10A, EXTV
CC
= 5V
1.52
3.13
3.64
1.6
4
V
A
A
A
mA
mA
mA
mA
μA
ns
ns
A
A
A
A
4600hvfc
I
Q(VIN)
Input Supply Bias Current
Min On Time
Min Off Time
I
S(VIN)
2
U
W W
W
PIN CONFIGURATION
TOP VIEW
V
IN
PGND
V
OUT
LGA PACKAGE
104-LEAD (15mm
×
15mm
×
2.8mm)
T
JMAX
= 125°C,
θ
JA
= 15°C/W,
θ
JC
= 6°C/W,
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS, WEIGHT = 1.7g
MIN
4.5
1.478
1.470
TYP
MAX
28
1.522
1.530
UNITS
V
V
●
1.50
1.50
75
LTM4600HV
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. External C
IN
= 120μF, C
OUT
= 200μF/Ceramic per typical
application (front page) configuration.
SYMBOL
PARAMETER
Output Specifications
I
OUTDC
Output Continuous Current Range
(See Output Current Derating Curves for
Different V
IN
, V
OUT
and T
A
)
Line Regulation Accuracy
CONDITIONS
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 24V, V
OUT
= 2.5V (Note 3)
V
OUT
= 1.5V. FCB = 0V, I
OUT
= 0A,
V
IN
= 4.5V to 28V
V
OUT
= 1.5V. FCB = 0V, I
OUT
= 0A to 10A
V
IN
= 5V
V
IN
= 12V (Note 4)
V
IN
= 12V, V
OUT
= 1.5V, FCB = 0V, I
OUT
= 0A
FCB = 0V, I
OUT
= 5A, V
IN
= 12V, V
OUT
= 1.5V
●
ELECTRICAL CHARACTERISTICS
MIN
0
0
TYP
MAX
10
10
UNITS
A
A
%
ΔV
OUT(LINE)
0.15
0.3
V
OUT
ΔV
OUT(LOAD)
Load Regulation Accuracy
V
OUT
V
OUT(AC)
fs
t
START
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Time
●
10
850
0.5
0.7
36
±1
±1.5
15
%
%
mV
P-P
kHz
ms
ms
mV
ΔV
OUTLS
t
SETTLE
I
OUTPK
V
OUT
= 1.5V, I
OUT
= 1A
V
IN
= 12V
V
IN
= 5V
Voltage Drop for Dynamic Load Step
V
OUT
= 1.5V, Load Step: 0A/μs to 5A/μs
C
OUT
= 3 • 22μF 6.3V, 470μF 4V POSCAP,
See Table 2
Settling Time for Dynamic Load Step V
IN
= 12V Load: 10% to 90% to 10% of Full Load
Output Current Limit
Output Voltage in Foldback
V
IN
= 24V, V
OUT
= 2.5V
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V
●
25
17
17
17
0.591
0.594
0.8
–0.5
0.8
0.6
0.6
1.5
–1.2
1.8
100
16
100
0.57
0.6
–1
7.5
–7.5
10
–10
2
0.15
0.4
0.63
–2
12.5
–12.5
0.609
0.606
2
–3
3
μs
A
A
A
V
V
V
μA
μA
mV
mA
kΩ
V
μA
%
%
%
V
Control Stage
V
OSET
V
RUN/SS
I
RUN(C)/SS
I
RUN(D)/SS
V
IN
– SV
IN
I
EXTVCC
R
FBHI
V
FCB
I
FCB
ΔV
OSETH
ΔV
OSETL
ΔV
OSET(HYS)
V
PGL
Current into EXTV
CC
Pin
Resistor Between V
OUT
and V
OSET
Pins
Forced Continuous Threshold
Forced Continuous Pin Current
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V
FCB
= 0.6V
V
OSET
Rising
V
OSET
Falling
V
OSET
Returning
I
PGOOD
= 5mA
Voltage at V
OSET
Pin
RUN ON/OFF Threshold
Soft-Start Charging Current
Soft-Start Discharging Current
V
RUN/SS
= 0V
V
RUN/SS
= 4V
EXTV
CC
= 0V, FCB = 0V
EXTV
CC
= 5V, FCB = 0V, V
OUT
= 1.5V, I
OUT
= 0A
PGOOD Output
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 LTM4600HVE is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTM46000HVMP
is guaranteed and tested over the –55°C to 125°C temperature range.
For output current derating at high temperature, please refer to Thermal
Considerations and Output Current Derating discussion.
Note 3:
Refer to current de-rating curves and thermal application note.
Note 4:
Test assumes current derating versus temperature.
4600hvfc
3
LTM4600HV
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 21 for all curves)
Efficiency vs Load Current
with 5V
IN
(FCB = 0)
100
90
80
EFFICIENCY (%)
70
60
50
40
30
0
2
6
4
LOAD CURRENT (A)
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
8
10
4600hv G01
EFFICIENCY (%)
70
60
50
40
30
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
0
2
6
LOAD CURRENT (A)
4
8
10
4600hv G02
EFFICIENCY (%)
Efficiency vs Load Current
with Different FCB Settings
90
80
70
EFFICIENCY (%)
60
FCB = GND
50
40
30
20
0.1
V
IN
= 12V
V
OUT
= 1.5V
1
LOAD CURRENT (A)
10
4600hv G04
FCB > 0.7V
V
OUT
= 50mV/DIV
1.8V Transient Response
25μs/DIV
1.8V AT 5A/μs LOAD STEP
C
OUT
= 3 • 22μF 6.3V CERAMICS
470μF 4V SANYO POSCAP
C3 = 100pF
4
U W
Efficiency vs Load Current
with 12V
IN
(FCB = 0)
100
90
80
100
90
80
70
60
50
40
30
Efficiency vs Load Current
with 24V
IN
(FCB = 0)
1.8V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
0
2
6
LOAD CURRENT (A)
4
8
10
4600hv G03
1.2V Transient Response
1.5V Transient Response
I
OUT
= 5A/DIV
25μs/DIV
1.2V AT 5A/μs LOAD STEP
C
OUT
= 3 • 22μF 6.3V CERAMICS
470μF 4V SANYO POSCAP
C3 = 100pF
4600hv G05
25μs/DIV
1.5V AT 5A/μs LOAD STEP
C
OUT
= 3 • 22μF 6.3V CERAMICS
470μF 4V SANYO POSCAP
C3 = 100pF
4600hv G06
2.5V Transient Response
3.3V Transient Response
4600hv G07
25μs/DIV
2.5V AT 5A/μs LOAD STEP
C
OUT
= 3 • 22μF 6.3V CERAMICS
470μF 4V SANYO POSCAP
C3 = 100pF
4600hv G08
25μs/DIV
3.3V AT 5A/μs LOAD STEP
C
OUT
= 3 • 22μF 6.3V CERAMICS
470μF 4V SANYO POSCAP
C3 = 100pF
4600hv G09
4600hvfc
LTM4600HV
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 21 for all curves)
Start-Up, I
OUT
= 0A
V
OUT
(0.5V/DIV)
I
IN
(0.5A/DIV)
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 200μF
NO EXTERNAL SOFT-START CAPACITOR
Short-Circuit Protection,
I
OUT
= 0A
V
OUT
(0.5V/DIV)
I
IN
(0.2A/DIV)
V
OUT
(V)
20μs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 2× 200μF/X5R
NO EXTERNAL SOFT-START CAPACITOR
4600hv G12
V
OSET
vs Temperature
0.610
0.605
V
OSET
(V)
0.600
0.595
V
IN
= 12V
V
OUT
= 1.5V
I
OUT
= 10A
–25
5
35
65
TEMPERATURE (°C)
95
125
400μs/DIV
4600HV G16
0.590
–55
U W
Start-Up, I
OUT
= 10A
(Resistive Load)
V
OUT
(0.5V/DIV)
I
IN
(0.5A/DIV)
200μs/DIV
4600hv G10
200μs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 200μF
NO EXTERNAL SOFT-START CAPACITOR
4600hv G11
Short-Circuit Protection,
I
OUT
= 10A
5.5
5.0
V
OUT
(0.5V/DIV)
I
IN
(0.5A/DIV)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
IN
to V
OUT
Stepdown Ratio
f
ADJ
= OPEN
5V
3.3V
2.5V
1.8V
1.5V
1.2V
0.6V
0
5
10
15
V
IN
(V)
20
24
20μs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 2× 200μF/X5R
NO EXTERNAL SOFT-START CAPACITOR
4600hv G13
SEE FREQUENCY ADJUSTMENT DISCUSSION
FOR 12V
IN
TO 5V
OUT
AND 5V
IN
TO 3.3V
OUT
CONVERSION
4600HV G14
Start-Up Waveform, T
A
= –55°C
4600HV G15
4600hvfc
5
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