input and output, 5A switching mode DC/DC power supply.
Included in the package are the switching controller, power
FETs, inductor and all support components. Operating
over an input voltage range of 5V to 36V, the LTM4612
supports an output voltage range of 3.3V to 15V, set by a
single resistor. Only bulk input and output capacitors are
needed to finish the design.
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.
The onboard input filter and noise cancellation circuits
achieve low noise coupling, thus effectively reducing the
electromagnetic interference (EMI)—see Figures 4 and 8.
Furthermore, the DC/DC μModule
TM
can be synchronized
with an external clock for reducing undesirable frequency
harmonics and allows PolyPhase
®
operation for high load
currents.
The LTM4612 is offered in a space saving and thermally
enhanced 15mm
×
15mm
×
2.8mm LGA package, which
enables utilization of unused space on the bottom of PC
boards for high density point-of-load regulation. The
LTM4612 is Pb-free and RoHS compliant.
, LT, LTC, LTM and PolyPhase 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.
Complete Low EMI Switch Mode Power Supply
CISPR 22 Class B Compliant
Wide Input Voltage Range: 5V to 36V
5A DC, 7A Peak Output Current
3.3V to 15V Output Voltage Range
Low Input and Output Referred Noise
Output Voltage Tracking and Margining
PLL Frequency Synchronization
±1.5%
Set Point Accuracy
Power Good Tracks with Margining
Current Foldback Protection (Disabled at Start-Up)
Parallel/Current Sharing
Ultrafast Transient Response
Current Mode Control
Programmable Soft-Start
Output Overvoltage Protection
–55°C to 125°C Operating Temperature Range
(LTM4612MPV)
Small Surface Mount Footprint, Low Profile
(15mm
×
15mm
×
2.8mm) LGA Package
APPLICATIONS
n
n
n
Telecom and Networking Equipment
Industrial and Avionic Equipment
RF Systems
TYPICAL APPLICATION
12V/5A Ultralow Noise μModule with 22V to 36V Input
V
IN
22V
TO 36V
CLOCK SYNC
2M
100k
V
IN
PLLIN
V
OUT
PGOOD
RUN LTM4612
COMP
V
FB
INTV
CC
DRV
CC
FCB
f
SET
MARG0
TRACK/SS
MARG1
V
D
MPGM
SGND
PGND
V
OUT
12V
5A
C
OUT
Efficiency vs Load Current at 12V Output
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
1
24V
IN
12V
OUT
28V
IN
12V
OUT
36V
IN
12V
OUT
2
3
4
OUTPUT CURRENT (A)
5
4612 TA01b
100pF
5.23k
MARGIN
CONTROL
392k
5% MARGIN
4612 TA01
C
IN
0.01μF
10μF
4612f
1
LTM4612
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
INTV
CC
PLLIN
TRACK/SS
RUN
COMP
MPGM
V
D
SGND
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
NC
NC
NC
FCB
TOP VIEW
INTV
CC,
DRV
CC
............................................. –0.3V to 6V
V
OUT
........................................................... –0.3V to 16V
PLLIN, FCB, TRACK/SS, MPGM, MARG0,
MARG1, PGOOD, f
SET
...........–0.3V to INTV
CC
+ 0.3V
RUN ............................................................. –0.3V to 5V
V
FB
, COMP ................................................ –0.3V to 2.7V
V
IN
, V
D
....................................................... –0.3V to 36V
Internal Operating Temperature Range (Note 2)
E and I Grades ...................................–40°C to 125°C
MP Grade...........................................–55°C to 125°C
Junction Temperature ........................................... 125°C
Storage Temperature Range...................–55°C to 125°C
A
V
IN
B
BANK 1
C
D
E
PGND
BANK 2
F
G
H
J
V
OUT
K
BANK 3
L
M
1 2 3 4 5 6 7 8 9 10 11 12
LGA PACKAGE
133-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
LTM4612EV#PBF
LTM4612IV#PBF
LTM4612MPV#PBF
TRAY
LTM4612EV#PBF
LTM4612IV#PBF
LTM4612MPV#PBF
PART MARKING*
LTM4612V
LTM4612V
LTM4612MPV
PACKAGE DESCRIPTION
133-Lead (15mm
×
15mm
×
2.8mm) LGA
133-Lead (15mm
×
15mm
×
2.8mm) LGA
133-Lead (15mm
×
15mm
×
2.8mm) LGA
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, unless otherwise noted. Per Typical Application
(front page) configuration.
CONDITIONS
l
MIN
5
11.89
11.89
TYP
MAX
36
UNITS
V
V
V
V
C
IN
= 10μF
×
3, C
OUT
= 300μF; FCB = 0
V
IN
= 24V, V
OUT
= 12V, I
OUT
= 0A
V
IN
= 36V, V
OUT
=12V, I
OUT
= 0A
I
OUT
= 0A
I
OUT
= 0A; C
IN
= 10μF
×
2, C
OUT
= 200μF;
V
OUT
= 12V
V
IN
= 24V
V
IN
= 36V
l
l
12.07
12.07
3.2
12.25
12.25
4.8
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Undervoltage Lockout Threshold
Input Inrush Current at Start-Up
0.6
0.7
A
A
4612f
2
LTM4612
ELECTRICAL CHARACTERISTICS
SYMBOL
I
Q(VIN)
PARAMETER
Input Supply Bias Current
The
l
denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, unless otherwise noted. Per Typical Application
(front page) configuration.
CONDITIONS
V
IN
= 36V, No Switching
V
IN
= 36V, V
OUT
= 12V, Switching Continuous
V
IN
= 24V, No Switching
V
IN
= 24V, V
OUT
= 12V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 36V
V
IN
= 36V, V
OUT
= 12V, I
OUT
= 5A
V
IN
= 24V, V
OUT
= 12V, I
OUT
= 5A
V
IN
= 36V, RUN > 2V, I
OUT
= 0A
V
IN
= 24V, V
OUT
= 12V (Note 4)
V
OUT
= 12V, FCB = 0V, V
IN
= 22V to 36V,
I
OUT
= 0A
V
OUT
= 12V, FCB = 0V, I
OUT
= 0A to 5A (Note 4)
V
IN
= 36V
V
IN
= 24V
I
OUT
= 0A,
C
IN
= 2
×
10μF X5R Ceramic and 1
×
100μF
Electrolytic, 1
×
10μF X5R Ceramic on V
D
Pins
V
IN
= 24V, V
OUT
= 5V
V
IN
= 24V, V
OUT
= 12V
I
OUT
= 0A,
C
OUT
= 2
×
22μF 2
×
47μF X5R Ceramic
,
V
IN
= 24V, V
OUT
= 5V
V
IN
= 24V, V
OUT
= 12V
I
OUT
= 1A, V
IN
= 24V, V
OUT
= 12V
C
OUT
= 200μF V
OUT
= 12V, I
OUT
= 0A
,
V
IN
= 36V
V
IN
= 24V
C
OUT
= 300μF V
OUT
= 12V, I
OUT
= 1A
,
Resistive Load
V
IN
= 36V
V
IN
= 24V
Load: 0% to 50% to 0% of Full Load
C
OUT
= 2
×
22μF Ceramic, 150μF Bulk
V
IN
= 24V, V
OUT
= 12V
C
OUT
= 200μF
V
IN
= 36V, V
OUT
= 12V
V
IN
= 24V, V
OUT
= 12V
I
OUT
= 0A, V
OUT
= 12V
V
SS/TRACK
= 0V
V
FCB
= 0V
(Note 3)
(Note 3)
l
l
l
l
MIN
TYP
4.5
57
3.5
48
50
1.85
2.72
MAX
UNITS
mA
mA
mA
mA
μA
A
A
I
S(VIN)
V
INTVCC
I
OUT(DC)
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
IN(AC)
Input Supply Current
Internal V
CC
Voltage
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
4.7
0
5
5.3
5
V
A
%
%
%
Output Specifications
0.05
0.3
0.3
0.3
0.6
0.6
Input Ripple Voltage
7.2
3.4
mV
P-P
mV
P-P
V
OUT(AC)
Output Ripple Voltage
17.5
12.5
940
20
20
mV
P-P
mV
P-P
kHz
mV
mV
f
S
ΔV
OUT(START)
Output Ripple Voltage Frequency
Turn-On Overshoot,
TRACK/SS = 10nF
Turn-On Time, TRACK/SS = Open
t
START
0.5
0.5
153
37
9
9
0.594
1
–1
0.57
0.6
1.5
–1.5
0.6
–1
50
250
0.606
1.9
–2
0.63
–2
100
400
ms
ms
mV
μs
A
A
V
V
μA
V
μA
ns
ns
4612f
ΔV
OUT(LS)
Peak Deviation for Dynamic Load
t
SETTLE
I
OUT(PK)
Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, V
IN
= 24V
Output Current Limit
Control Section
V
FB
V
RUN
I
SS / TRACK
V
FCB
I
FCB
t
ON(MIN)
t
OFF(MIN)
Voltage at V
FB
Pin
RUN Pin On/Off Threshold
Soft-Start Charging Current
Forced Continuous Threshold
Forced Continuous Pin Current
Minimum On-Time
Minimum Off-Time
3
LTM4612
ELECTRICAL CHARACTERISTICS
SYMBOL
R
PLLIN
I
DRVCC
R
FBHI
V
MPGM
V
MARG0
, V
MARG1
PGOOD
ΔV
FBH
ΔV
FBL
ΔV
FB(HYS)
V
PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V
FB
Rising
V
FB
Falling
V
FB
Returning
I
PGOOD
= 5mA
7
–7
10
–10
1.5
0.15
0.4
13
–13
%
%
%
V
PARAMETER
PLLIN Input Resistor
Current into DRV
CC
Pin
Resistor Between V
OUT
and V
FB
Pins
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 12V, I
OUT
= 1A
99.5
The
l
denotes the specifications which apply over the –40°C to 85°C
operating temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, unless otherwise noted. Per Typical Application
(front page) configuration.
CONDITIONS
MIN
TYP
50
22
100
1.18
1.4
30
100.5
MAX
UNITS
kΩ
mA
kΩ
V
V
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 LTM4612E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4612I is guaranteed to meet specifications over the
–40°C to 125°C internal operating temperature range. The LTM4612MP
is guaranteed and tested over the full –55°C to 125°C internal operating
temperature range. Note that the maximum ambient temperature is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 3:
100% tested at die level only.
Note 4:
See the Output Current Derating curves for different V
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FPGA/CPLD
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