supply. Included in the package are the switching control-
ler, power FETs, inductor, and all support components.
Operating over an input voltage range of 4.5V to 20V, the
LTM4602 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 LTM4602 is packaged in a thermally enhanced, compact
(15mm
×
15mm) and low profile (2.8mm) over-molded
Land Grid Array (LGA) package suitable for automated as-
sembly by standard surface mount equipment. For the 4.5V
to 28V input range version, refer to the LTM4602HV.
L,
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.
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 20V
6A DC, 8A Peak Output Current
0.6V to 5V Output Voltage
1.5% Output Voltage Regulation
Ultrafast Transient Response
Current Mode Control
Pb-Free (e4) RoHS Compliant Package with Gold-
Pad Finish
Pin Compatible with the LTM4600
Up to 92% Efficiency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
See the LTM4602HV for Operation Up to 28V
IN
Small Footprint, Low Profile (15mm × 15mm ×
2.8mm) Surface Mount LGA Package
APPLICATIONS
n
n
n
n
Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
TYPICAL APPLICATION
6A μModule
TM
Power Supply with 4.5V to 20V Input
V
IN
4.5V TO 20V
V
IN
C
IN
V
OUT
LTM4602
V
OSET
PGND SGND
C
OUT
V
OUT
1.5V
6A
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
Efficiency vs Load Current
with 12V
IN
(FCB = 0)
R
SET
66.5k
4602 TA01a
0.8V
OUT
1.2V
OUT
1.5V
OUT
1.8V
OUT
2.5V
OUT
3.3V
OUT
3.3V
OUT
(950kHz)*
*950kHz INSTEAD OF 1.3MHz
INCREASES 3.3V EFFICIENCY 2%
2
4
6
LOAD CURRENT (A)
8
4602 TA01b
4602fa
1
LTM4602
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
f
ADJ
SV
IN
EXTV
CC
V
OSET
COMP
SGND
RUN/SS
FCB
PGOOD
PGND
TOP VIEW
FCB, EXTV
CC
, PGOOD, RUN/SS, V
OUT
.......... –0.3V to 6V
V
IN
, SV
IN
, f
ADJ
............................................ –0.3V to 20V
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
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 INFORMATION
LEAD FREE FINISH
LTM4602EV#PBF
LTM4602IV#PBF
PART MARKING*
LTM4602V
LTM4602V
PACKAGE DESCRIPTION
104-Lead (15mm
×
15mm
×
2.8mm) LGA
104-Lead (15mm
×
15mm
×
2.8mm) LGA
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
The
l
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
FCB = 0V
V
IN
= 5V or 12V, V
OUT
= 1.5V, I
OUT
= 0A
CONDITIONS
l
ELECTRICAL CHARACTERISTICS
MIN
4.5
1.478
1.470
TYP
MAX
20
UNITS
V
V
l
1.50
1.50
3.4
0.6
0.7
1.2
42
1.0
52
50
1.522
1.530
4
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
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
= 5V, V
OUT
= 1.5V, FCB = 5V
V
IN
= 5V, V
OUT
= 1.5V, FCB = 0V
Shutdown, RUN = 0.8V, V
IN
= 12V
V
A
A
mA
mA
mA
mA
μA
4602fa
I
Q(VIN)
Input Supply Bias Current
100
2
LTM4602
ELECTRICAL CHARACTERISTICS
SYMBOL
I
S(VIN)
PARAMETER
Input Supply Current
The
l
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
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
= 6 A
0
MIN
TYP
0.88
1.80
2.08
6
MAX
UNITS
A
A
A
A
Output Specifications
I
OUTDC
Output Continuous Current Range
V
IN
= 12V, V
OUT
= 1.5V
(See Output Current Derating Curves for
Different V
IN
, V
OUT
and T
A
)
Line Regulation Accuracy
Load Regulation Accuracy
V
OUT
= 1.5V, I
OUT
= 0A, FCB = 0V,
V
IN
= 4.5V to 20V
V
OUT
= 1.5V, I
OUT
= 0A to 6A, FCB = 0V,
V
IN
= 5V, V
IN
= 12V (Note 3)
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 0A, FCB = 0V
V
OUT
= 1.5V, I
OUT
= 6A, FCB = 0V
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 POSCAP
,
See Table 2
Load: 10% to 50% to 10% of Full Load
Output Voltage in Foldback
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V
V
RUN/SS
= 0V
V
RUN/SS
= 4V
EXTV
CC
= 0V, FCB = 0V
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
7.5
–7.5
0.57
EXTV
CC
= 5V, FCB = 0V, V
OUT
= 1.5V,
I
OUT
= 0A
l
l
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
fs
t
START
0.15
0.3
%
l
±0.25
±0.15
10
850
0.5
0.7
30
±0.5
±1.0
15
%
%
mV
P-P
kHz
ms
ms
mV
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Time
ΔV
OUTLS
Voltage Drop for Dynamic Load Step
t
SETTLE
I
OUTPK
Settling Time for Dynamic Load Step
Output Current Limit
25
9
9
0.591
0.8
–0.5
0.8
0.6
1.5
–1.2
1.8
100
16
100
0.6
–1
10
–10
2
0.15
0.4
0.63
–2
12.5
–12.5
0.609
2
–3
3
μs
A
A
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
PGOOD Output
ΔV
OSETH
ΔV
OSETL
ΔV
OSET(HYS)
V
PGL
Voltage at V
OSET
Pin
RUN ON/OFF Threshold
Soft-Start Charging Current
Soft-Start Discharging Current
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 LTM4602E 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 LTM4602I is guaranteed over the
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