FeaTures
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LTM4601/LTM4601-1
12A µModule Regulators
with PLL, Output Tracking
and Margining
DescripTion
The
LTM
®
4601
is a complete 12A step-down switch mode
DC/DC power supply with onboard switching controller,
MOSFETs, inductor and all support components. The
µModule
®
regulator is housed in small surface mount
15mm
×
15mm
×
2.82mm LGA and 15mm
×
15mm
×
3.42mm BGA packages. Operating over an input voltage
range of 4.5V to 20V, the LTM4601 supports an output
voltage range of 0.6V to 5V as well as output voltage
tracking and margining. The high efficiency design deliv-
ers 12A continuous current (14A peak). Only bulk input
and output capacitors are needed to complete the design.
The low profile and light weight package easily mounts
in unused space on the back side of PC boards for high
density point of load regulation. The µModule regulator
can be synchronized with an external clock for reducing
undesirable frequency harmonics and allows PolyPhase
®
operation for high load currents.
A high switching frequency and adaptive on-time current
mode architecture deliver a very fast transient response
to line and load changes without sacrificing stability. An
onboard differential remote sense amplifier can be used
to accurately regulate an output voltage independent of
load current. The onboard remote sense amplifier is not
available in the LTM4601-1.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks and UltraFast and LTpowerCAD are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210.
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Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 20V
12A DC Typical, 14A Peak Output Current
0.6V to 5V Output Voltage
Output Voltage Tracking and Margining
Parallel Multiple µModule Regulators for Current
Sharing
Differential Remote Sensing for Precision
Regulation (LTM4601 Only)
PLL Frequency Synchronization
±1.5% Regulation
Current Foldback Protection (Disabled at Start-Up)
SnPb or RoHS Compliant Finish
UltraFast™ Transient Response
Current Mode Control
Up to 95% Efficiency at 5V
IN
, 3.3V
OUT
Programmable Soft-Start
Output Overvoltage Protection
Small Footprint, Low Profile
(15mm
×
15mm
×
2.82mm) Surface Mount LGA and
(15mm
×
15mm
×
3.42mm) BGA Packages
applicaTions
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Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
Typical applicaTion
1.5V/12A Power Supply with 4.5V to 20V Input
V
IN
4.5V TO 20V
V
IN
PGOOD
ON/OFF
C
IN
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
R
SET
40.2k
4601 TA01a
Efficiency and Power Loss
vs Load Current
95
90
EFFICIENCY
5V
IN
4.0
3.5
12V
IN
3.0
2.5
12V
IN
5V
IN
2.0
1.5
POWER LOSS
1.0
0.5
CLOCK SYNC
TRACK/SS CONTROL
V
OUT
1.5V
12A
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
2
POWER LOSS (W)
100pF
MARGIN
CONTROL
LTM4601
C
OUT
R1
392k
5% MARGIN
PGND
f
SET
4
6
8
10
LOAD CURRENT (A)
12
14
4601 TA01b
4601fe
For more information
www.linear.com/LTM4601
1
LTM4601/LTM4601-1
(Note 1)
absoluTe MaxiMuM raTings
V
IN
............................................................. –0.3V to 20V
V
OSNS+
, V
OSNS –
..........................–0.3V to INTV
CC
+ 0.3V
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range .................. –55°C to 125°C
Reflow (Peak Body) Temperature .......................... 245°C
INTV
CC
, DRV
CC
, V
OUT_LCL
, V
OUT
(V
OUT
≤ 3.3V with
DIFFV
OUT
) .................................................... –0.3V to 6V
PLLIN, TRACK/SS, MPGM, MARG0, MARG1,
PGOOD, f
SET
..............................–0.3V to INTV
CC
+ 0.3V
RUN (Note 5) ............................................... –0.3V to 5V
V
FB
, COMP ................................................ –0.3V to 2.7V
pin conFiguraTion
TRACK/SS
INTV
CC
TRACK/SS
TOP VIEW
PLLIN
TOP VIEW
INTV
CC
MPGM
COMP
PLLIN
RUN
MPGM
f
SET
MARG0
MARG1
DRV
CC
PGND
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
V
OUT
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
BGA PACKAGE
118-LEAD (15mm
×
15mm
×
3.42mm)
COMP
RUN
V
IN
f
SET
MARG0
MARG1
DRV
CC
V
IN
PGND
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
V
OUT
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
LGA PACKAGE
118-LEAD (15mm
×
15mm
×
2.82mm)
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
*LTM4601-1 ONLY
T
JMAX
= 125°C,
θ
JA
= 15.5°C/W,
θ
JC
= 6.5°C/W,
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS
WEIGHT = 1.9g
*LTM4601-1 ONLY
orDer inForMaTion
PART NUMBER
LTM4601EV#PBF
LTM4601IV#PBF
LTM4601EV-1#PBF
LTM4601IV-1#PBF
LTM4601EY#PBF
LTM4601IY#PBF
LTM4601EY-1#PBF
LTM4601IY-1#PBF
LTM4601IY
LTM4601IY-1
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
SnPb (63/37)
PART MARKING*
DEVICE
LTM4601V
LTM4601V
LTM4601V-1
LTM4601V-1
LTM4601Y
LTM4601Y
LTM4601Y-1
LTM4601Y-1
LTM4601Y
LTM4601Y-1
FINISH CODE
e4
e4
e4
e4
e1
e1
e1
e1
e0
e0
PACKAGE
TYPE
LGA
LGA
LGA
LGA
BGA
BGA
BGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
3
3
3
3
3
TEMPERATURE RANGE
(Note 2)
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
4601fe
2
For more information
www.linear.com/LTM4601
LTM4601/LTM4601-1
orDer inForMaTion
Consult Marketing for parts specified with wider operating temperature
ranges. *Device temperature grade is indicated by a label on the shipping
container. Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Terminal Finish Part Marking:
www.linear.com/leadfree
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• LGA and BGA Package and Tray Drawings:
www.linear.com/packaging
The
l
denotes the specifications which apply over the –40°C to 85°C
temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page) configuration.
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
C
IN
= 10µF
×3,
C
OUT
= 200µF R
SET
= 40.2k
,
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 0A
I
OUT
= 0A
I
OUT
= 0A. V
OUT
= 1.5V
V
IN
= 5V
V
IN
= 12V
V
IN
= 12V, No Switching
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous
V
IN
= 5V, No Switching
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 12A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 12A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 12A
No Load
V
IN
= 12V, V
OUT
= 1.5V (Note 6)
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
from 4.5V to 20V
V
OUT
= 1.5V, 0A to 12A (Note 6)
V
IN
= 12V, with Remote Sense Amplifier
V
IN
= 12V (LTM4601-1)
I
OUT
= 0A, C
OUT
= 2× 100µF X5R Ceramic
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 5A, V
IN
= 12V, V
OUT
= 1.5V
C
OUT
= 200µF V
OUT
= 1.5V, I
OUT
= 0A,
,
TRACK/SS = 10nF
V
IN
= 12V
V
IN
= 5V
C
OUT
= 200µF V
OUT
= 1.5V, TRACK/SS = Open,
,
I
OUT
= 1A Resistive Load
V
IN
= 12V
V
IN
= 5V
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elecTrical characTerisTics
CONDITIONS
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MIN
4.5
1.478
1.478
TYP
MAX
20
UNITS
V
V
V
V
A
A
mA
mA
mA
mA
µA
A
A
A
1.5
1.5
3.2
0.6
0.7
3.8
38
2.5
42
22
1.81
3.63
4.29
1.522
1.522
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Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
I
Q(VIN,NOLOAD)
Undervoltage Lockout Threshold
Input Inrush Current at Start-Up
Input Supply Bias Current
I
S(VIN)
INTV
CC
I
OUTDC
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
f
S
ΔV
OUT(START)
Input Supply Current
V
IN
= 12V, RUN > 2V
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
4.7
0
5
5.3
12
0.3
V
A
%
Output Specifications
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0.25
1
20
18
850
%
%
mV
P-P
mV
P-P
kHz
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Overshoot
20
20
mV
mV
t
START
Turn-On Time
0.5
0.5
ms
ms
4601fe
For more information
www.linear.com/LTM4601
3
LTM4601/LTM4601-1
The
l
denotes the specifications which apply over the –40°C to 85°C
temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page) configuration.
SYMBOL
ΔV
OUTLS
PARAMETER
Peak Deviation for Dynamic Load
CONDITIONS
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 2
×
22µF Ceramic, 470µF 4V Sanyo
POSCAP
V
IN
= 12V
V
IN
= 5V
MIN
TYP
MAX
UNITS
elecTrical characTerisTics
35
35
25
17
17
0
0
1
3
2
INTV
CC
– 1
INTV
CC
– 1
1.25
mV
mV
µs
A
A
V
V
mV
V/V
MHz
V/µs
kW
dB
0.606
1.9
–2.0
100
400
25
60.702
V
V
µA
ns
ns
kW
mA
kW
V
V
13
–13
%
%
%
t
SETTLE
I
OUTPK
Settling Time for Dynamic Load Step Load: 0% to 50%, or 50% to 0% of Full Load
V
IN
= 12V
Output Current Limit
C
OUT
= 200µF Ceramic
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
Remote Sense Amp (Note 3) (LTM4601 Only, Not Supported in the LTM4601-1)
V
OSNS+
, V
OSNS–
CM Range
DIFFV
OUT
Range
V
OS
A
V
GBP
SR
R
IN
CMRR
Control Stage
V
FB
V
RUN
I
TRACK/SS
t
ON(MIN)
t
OFF(MIN)
R
PLLIN
I
DRVCC
R
FBHI
V
MPGM
V
MARG0
, V
MARG1
PGOOD Output
ΔV
FBH
ΔV
FBL
ΔV
FB(HYS)
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
V
FB
Rising
V
FB
Falling
V
FB
Returning
7
–7
10
–10
1.5
Error Amplifier Input Voltage
Accuracy
RUN Pin On/Off Threshold
Soft-Start Charging Current
Minimum On Time
Minimum Off Time
PLLIN Input Resistance
Current into DRV
CC
Pin
Resistor Between V
OUT_LCL
and V
FB
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 1.5V, I
OUT
= 1A, DRV
CC
= 5V
60.098
V
TRACK/SS
= 0V
(Note 4)
(Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
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Common Mode Input Voltage Range V
IN
= 12V, RUN > 2V
Output Voltage Range
Input Offset Voltage Magnitude
Differential Gain
Gain Bandwidth Product
Slew Rate
Input Resistance
Common Mode Rejection Mode
V
OSNS+
to GND
V
IN
= 12V, DIFFV
OUT
Load = 100k
20
100
0.594
1
–1.0
0.6
1.5
–1.5
50
250
50
18
60.4
1.18
1.4
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 LTM4601 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4601E/LTM4601E-1 are 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 LTM4601I/LTM4601I-1
are guaranteed over the –40°C to 85°C operating temperature range.
Note 3:
Remote sense amplifier recommended for ≤3.3V output.
Note 4:
100% tested at wafer level only.
Note 5:
Limit current into RUN pin to less than 1mA.
Note
6:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
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4601fe
For more information
www.linear.com/LTM4601
LTM4601/LTM4601-1
Typical perForMance characTerisTics
(See Figure 18 for all curves)
Efficiency vs Load Current
with 5V
IN
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
0
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5
10
15
4601 G01
Efficiency vs Load Current
with 12V
IN
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
10
5
LOAD CURRENT (A)
15
4601 G02
Efficiency vs Load Current
with 20V
IN
100
95
90
85
80
75
70
65
60
0
10
5
LOAD CURRENT (A)
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5.0V
OUT
15
4601 G03
LOAD CURRENT (A)
1.2V Transient Response
V
OUT
50mV/DIV
0A TO 6A
LOAD STEP
V
OUT
50mV/DIV
1.5V Transient Response
V
OUT
50mV/DIV
1.8V Transient Response
0A TO 6A
LOAD STEP
0A TO 6A
LOAD STEP
20µs/DIV
1.2V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G04
20µs/DIV
1.5V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G05
20µs/DIV
1.8V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G06
2.5V Transient Response
V
OUT
50mV/DIV
V
OUT
50mV/DIV
0A TO 6A
LOAD STEP
3.3V Transient Response
0A TO 6A
LOAD STEP
20µs/DIV
2.5V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G07
20µs/DIV
3.3V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G08
4601fe
For more information
www.linear.com/LTM4601
5
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