FEATURES
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LTM4602HV
6A, 28V
IN
High Efficiency
DC/DC µModule
DESCRIPTIO
The LTM
®
4602HV is a complete 6A, 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 LTM4602HV
supports an output voltage range of 0.6V to 5V, set by
a single resistor. This high efficiency design delivers 6A
continuous current (8A 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 LTM4602HV is packaged in a thermally enhanced, com-
pact (15mm
×
15mm) and low profile (2.8mm) over-molded
Land Grid Array (LGA) package suitable for automated
assembly by standard surface mount equipment. For the
4.5V to 20V input range version, refer to the LTM4602.
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 28V
6A DC, Typical 8A Peak Output Current
0.6V to 5V Output Voltage
1.5% Output Voltage Regulation
Ultrafast Transient Response
Parallel µModule™ DC/DC Converters
Current Mode Control
Pin Compatible with the LTM4600 and LTM4602
Up to 92% Efficiency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Pb-Free (e4) RoHS Compliant Package with Gold-Pad
Finish
Small Footprint, Low Profile (15mm × 15mm ×
2.8mm) LGA Package
APPLICATIO S
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Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
, LT, LTC 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. Protected by U.S. Patents including 5481178,
6100678, 6580258, 5847554, 6304066.
TYPICAL APPLICATIO
Efficiency vs Load Current with 24V
IN
(FCB = 0)
90
80
6A µModule Power Supply with 4.5V to 28V Input
V
IN
4.5V TO 28V
ABS MAX
V
IN
C
IN
V
OUT
C
OUT
V
OUT
2.5V
6A
EFFICIENCY (%)
70
60
50
40
30
20
10
1.2V
OUT
1.5V
OUT
1.8V
OUT
2.5V
OUT
3.3V
OUT
3.3V
OUT
(1MHz)
0
1
2
3
4
LOAD CURRENT (A)
5
6
LTM4602HV
V
OSET
PGND SGND
31.6k
4602HV TA01a
0
U
U
U
4602HV G03
4602hvf
1
LTM4602HV
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
f
ADJ
SV
IN
EXTV
CC
V
OSET
TOP VIEW
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) ... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range................... –55°C to 125°C
V
IN
COMP
SGND
RUN/SS
FCB
PGOOD
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
ORDER PART NUMBER
LTM4602HVEV#PBF
LTM4602HVIV#PBF
LGA PART MARKING*
LTM4602HVV
LTM4602HVV
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
The
●
denotes the specifications which apply over the –40°C to 85°C
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
MIN
4.5
1.478
1.470
TYP
MAX
28
1.522
1.530
4
UNITS
V
V
V
V
A
A
A
mA
mA
mA
mA
µA
ns
ns
A
A
A
A
4602hvf
●
1.50
1.50
3.4
0.6
0.7
0.8
1.2
42
1.8
36
50
100
400
0.88
1.50
2.08
0.98
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
I
Q(VIN)
Input Supply Bias Current
100
Min On Time
Min Off Time
I
S(VIN)
Input Supply Current
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 6A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 6A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 6A
V
IN
= 24V to 3.3V at 6A, EXTV
CC
= 5V
2
U
W
U
U
W W
W
LTM4602HV
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Output Specifications
I
OUTDC
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(0A-6A)
V
OUT
V
OUT(AC)
fs
t
START
ΔV
OUTLS
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Time
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
MIN
0
0
●
TYP
MAX
6
6
UNITS
A
A
%
Output Continuous Current Range
V
IN
= 12V, V
OUT
= 1.5V
(See Output Current Derating Curves for V
IN
= 24V, V
OUT
= 2.5V (Note 3)
Different V
IN
, V
OUT
and T
A
)
Line Regulation Accuracy
V
OUT
= 1.5V. FCB = 0V, I
OUT
= 0A,
V
IN
= 4.5V to 28V
Load Regulation Accuracy
V
OUT
= 1.5V. FCB = 0V, I
OUT
= 0A to 6A,
V
IN
= 5V, V
IN
= 12V (Note 4)
V
IN
= 12V, V
OUT
= 1.5V, FCB = 0V, I
OUT
= 0A
FCB = 0V, I
OUT
= 6A, V
IN
= 12V,
V
OUT
= 1.5V
V
OUT
= 1.5V, I
OUT
= 1A
V
IN
= 12V
V
IN
= 5V
V
OUT
= 1.5V, Load Step: 0A/µs to 3A/µs
C
OUT
= 22µF 6.3V, 330µF 4V Pos Cap,
See Table 2
Load: 10% to 90% to 10% of Full Load
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
0.15
●
±0.25
±0.5
10
800
±0.5
±1
15
%
%
mV
P-P
kHz
Voltage Drop for Dynamic Load Step
0.5
0.7
30
ms
ms
mV
t
SETTLE
I
OUTPK
Settling Time for Dynamic Load Step
V
IN
= 12V
Output Current Limit
25
µs
9
9
9
●
A
A
A
0.609
0.606
2
–3
3
V
V
V
µA
µA
mV
mA
kΩ
0.63
–2
12.5
–12.5
0.4
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
PGOOD Output
ΔV
OSETH
ΔV
OSETL
ΔV
OSET(HYS)
V
PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V
OSET
Rising
V
OSET
Falling
V
OSET
Returning
I
PGOOD
= 5mA
7.5
–7.5
10
–10
2
0.15
Current into EXTV
CC
Pin
Resistor Between V
OUT
and FB Pins
Forced Continuous Threshold
Forced Continuous Pin Current
V
FCB
= 0.6V
0.57
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
0.591
0.594
0.8
–0.5
0.8
0.6
0.6
1.5
–1.2
1.8
100
16
100
0.6
–1
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 LTM4602HVE 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 LTM4602HVI is
guaranteed and tested over the –40°C to 85°C temperature range.
Note 3:
Refer to current de-rating curves and thermal application note.
Note 4:
Test assumes current derating verses temperature.
4602hvf
3
LTM4602HV
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 22 for all curves)
Efficiency vs Load Current
with 5V
IN
(FCB = 0)
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
2
4
6
LOAD CURRENT (A)
8
4602HV G01
0.8V
OUT
1.2V
OUT
1.5V
OUT
1.8V
OUT
2.5V
OUT
3.3V
OUT
*
*FOR 5V TO 3.3V CONVERSION,
SEE FREQUENCY ADJUSTMENT
IN APPLICATIONS INFORMATION
60
50
40
30
20
10
0
0
2
4
6
LOAD CURRENT (A)
8
4602HV G02
EFFICIENCY (%)
Light Load Efficiency vs
Load Current with 12V
IN
(FCB > 0.7V, <5V)
100
90
80
EFFICIENCY (%)
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
LOAD CURRENT (A)
1
70
100
1.5V Transient Response
V
OUT
50mV/DIV
V
OUT
50mV/DIV
I
OUT
2A/DIV
20µs/DIV
1.5V AT 3A/µs LOAD STEP
C
OUT
= 22µF, 6.3V CERAMIC
330µF, 4V SANYO POS CAP
4602HV G06
4
U W
4602HV G15
Efficiency vs Load Current
with 12V
IN
(FCB = 0)
100
90
80
70
90
80
70
60
50
40
30
20
10
0
Efficiency vs Load Current
with 24V
IN
(FCB = 0)
0.8V
OUT
1.2V
OUT
1.5V
OUT
1.8V
OUT
2.5V
OUT
3.3V
OUT
3.3V
OUT
(950kHz)
1.2V
OUT
1.5V
OUT
1.8V
OUT
2.5V
OUT
3.3V
OUT
3.3V
OUT
(1MHz)
0
1
2
3
4
LOAD CURRENT (A)
5
6
4602HV G03
Efficiency vs Load Current
with Different FCB Settings
V
IN
= 12V
90 V
OUT
= 1.5V
FCB > 0.7V
80
1.2V Transient Response
V
OUT
50mV/DIV
I
OUT
2A/DIV
20µs/DIV
1.2V AT 3A/µs LOAD STEP
C
OUT
= 22µF, 6.3V CERAMIC
330µF, 4V SANYO POS CAP
4602HV G05
FCB = GND
60
50
40
30
20
0.1
1
LOAD CURRENT (A)
5
4602HV G04
1.8V Transient Response
V
OUT
50mV/DIV
2.5V Transient Response
I
OUT
2A/DIV
20µs/DIV
1.8V AT 3A/µs LOAD STEP
C
OUT
= 22µF, 6.3V CERAMIC
330µF, 4V SANYO POS CAP
4602HV G07
I
OUT
2A/DIV
20µs/DIV
2.5V AT 3A/µs LOAD STEP
C
OUT
= 22µF, 6.3V CERAMIC
330µF, 4V SANYO POS CAP
4602HV G08
4602hvf
LTM4602HV
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 22 for all curves)
3.3V Transient Response
V
OUT
50mV/DIV
I
OUT
2A/DIV
20µs/DIV
3.3V AT 3A/µs LOAD STEP
C
OUT
= 22µF, 6.3V CERAMIC
330µF, 4V SANYO POS CAP
4602HV G09
Short-Circuit Protection,
I
OUT
= 0A
V
OUT
0.5V/DIV
V
OUT
(V)
I
IN
0.5A/DIV
4602HV G12
20µs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 1
×
22µF, 6.3V X5R
330µF, 4V SANYO POS CAP
NO EXTERNAL SOFT-START CAPACITOR
U W
Start-Up, I
OUT
= 0A
Start-Up, I
OUT
= 6A
(Resistive Load)
V
OUT
0.5V/DIV
V
OUT
0.5V/DIV
I
IN
0.5A/DIV
4602HV G10
200µs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 1
×
22µF, 6.3V X5R
330µF, 4V SANYO POS CAP
NO EXTERNAL SOFT-START CAPACITOR
I
IN
0.5A/DIV
4602HV G11
500µs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 1
×
22µF, 6.3V X5R
330µF, 4V SANYO POS CAP
NO EXTERNAL SOFT-START CAPACITOR
Short-Circuit Protection,
I
OUT
= 6A
5.5
5.0
V
OUT
0.5V/DIV
4.5
4.0
3.5
I
IN
0.5A/DIV
4602HV G13
20µs/DIV
V
IN
= 12V
V
OUT
= 1.5V
C
OUT
= 1
×
22µF, 6.3V X5R
330µF, 4V SANYO POS CAP
NO EXTERNAL SOFT-START CAPACITOR
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
25 28
3.0
2.5
2.0
1.5
1.0
0.5
0
SEE FREQUENCY ADJUSTMENT DISCUSSION
FOR 12V
IN
TO 5V
OUT
AND 5V
IN
TO 3.3V
OUT
CONVERSION
4602HV G14
4602hvf
5
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