FEATURES
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LTM4601A/LTM4601A-1
12A µModule Regulators
with PLL, Output Tracking
and Margining
DESCRIPTION
The
LTM
®
4601A
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 a small surface mount
15mm
×
15mm
×
2.82mm LGA or 15mm
×
15mm
×
3.42mm BGA package. The LTM4601A LGA and BGA
packages are designed with redundant mounting pads to
enhance solder-joint strength for extended temperature
cycling endurance. Operating over an input voltage range
of 4.5V to 20V, the LTM4601A supports an output voltage
range of 0.6V to 5V as well as output voltage tracking
and margining. The high efficiency design delivers 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
on the back side of PC boards. The µModule regulator
can be synchronized with an external clock for reducing
undesirable frequency harmonics and allows PolyPhase
®
operation for high load currents.
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 LTM4601A-1.
L,
LT, LTC, LTM, µModule and PolyPhase are registered trademarks of Linear Technology
Corporation. 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, 6304066, 6476589, 6580258, 6677210, 6774611.
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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
Redundant Mounting Pads for Enhanced Solder-
Joint Strength
Parallel Multiple µModules for Current Sharing
Differential Remote Sensing for Precision
Regulation (LTM4601A Only)
PLL Frequency Synchronization
±1.5% Total DC Error
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
Enhanced (15mm
×
15mm
×
2.82mm) Surface Mount
LGA and (15mm
×
15mm
×
3.42mm) BGA Packages
APPLICATIONS
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Telecom and Networking Equipment
Servers
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
4601A TA01a
Efficiency and Power Loss
vs Load Current
95
90
V
OUT
1.5V
12A
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
2
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
100pF
MARGIN
CONTROL
POWER LOSS (W)
LTM4601A
C
OUT
R1
392k
5% MARGIN
PGND
f
SET
4
6
8
10
LOAD CURRENT (A)
12
14
4601A TA01b
4601afe
For more information
www.linear.com/LTM4601A
1
LTM4601A/LTM4601A-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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 ............................................................. –0.3V to 5V
V
FB
, COMP ................................................ –0.3V to 2.7V
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
Peak Solder Reflow Body Temperature ................. 245°C
PIN CONFIGURATION
TRACK/SS
TOP VIEW
INTV
CC
PLLIN
RUN
(See Table 5. Pin Assignment)
TRACK/SS
TOP VIEW
MPGM
COMP
INTV
CC
V
IN
MTP1
MTP2
INTV
CC
MTP3
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
DIFFV
OUT
/NC3*
MPGM
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
V
IN
MTP1
MTP2
INTV
CC
MTP3
PGND
PGND
V
OUT
V
OUT_LCL
V
OSNS–
/NC1*
BGA PACKAGE
133-LEAD (15mm
×
15mm
×
3.42mm)
V
OUT
T
JMAX
= 125°C,
θ
JA
= 15.5°C/W,
θ
JCbottom
= 6.5°C/W
θ
JA
DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERS
WEIGHT = 1.9g, *LTM4601A-1 ONLY
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, *LTM4601A-1 ONLY
LGA PACKAGE
133-LEAD (15mm
×
15mm
×
2.82mm)
ORDER INFORMATION
PART NUMBER
LTM4601AEV#PBF
LTM4601AIV#PBF
LTM4601AEV-1#PBF
LTM4601AIV-1#PBF
LTM4601AEY#PBF
LTM4601AEY-1#PBF
LTM4601AIY-1#PBF
LTM4601AIY#PBF
LTM4601AIY
LTM4601AIY-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
LTM4601AV
LTM4601AV
LTM4601AV-1
LTM4601AV-1
LTM4601AY
LTM4601AY-1
LTM4601AY-1
LTM4601AY
LTM4601AY
LTM4601AY-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
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
COMP
PLLIN
RUN
4601afe
2
For more information
www.linear.com/LTM4601A
LTM4601A/LTM4601A-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage, Total Variation with
Line and Load
Undervoltage Lockout Threshold
Input Inrush Current at Startup
C
IN
= 10µF
×3,
C
OUT
= 200µF, R
SET
= 40.2k
V
IN
= 5V to 20V, I
OUT
= 0A to 12A (Note 5)
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 5)
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
from 4.5V to 20V
V
OUT
= 1.5V, 0A to 12A (Note 5)
V
IN
= 12V, with Remote Sense Amplifier
V
IN
= 12V (LTM4601A-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
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 2
×
22µF Ceramic, 470µF 4V Sanyo
POSCAP
V
IN
= 12V
V
IN
= 5V
l
The
l
denotes the specifications which apply over the specified operating
temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page) configuration.
CONDITIONS
l
l
MIN
4.5
1.478
TYP
MAX
20
UNITS
V
V
V
A
A
mA
mA
mA
mA
µA
A
A
A
1.5
3.2
0.6
0.7
3.8
38
2.5
42
22
1.81
3.63
4.29
1.522
4
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
I
Q(VIN,NOLOAD)
Input Supply Bias Current
I
S(VIN)
INTV
CC
I
OUTDC
∆V
OUT(LINE)
V
OUT
∆V
OUT(LOAD)
V
OUT
V
OUT(AC)
f
S
∆V
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
l
l
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
ΔV
OUTLS
Peak Deviation for Dynamic Load
35
35
25
17
17
mV
mV
µs
A
A
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
4601afe
For more information
www.linear.com/LTM4601A
3
LTM4601A/LTM4601A-1
ELECTRICAL CHARACTERISTICS
SYMBOL
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
∆V
FBH
∆V
FBL
∆V
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
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
l
The
l
denotes the specifications which apply over the specified operating
temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page) configuration.
PARAMETER
CONDITIONS
MIN
0
0
1
3
2
V
OSNS+
to GND
20
100
0.594
1
–1
0.6
1.5
–1.5
50
250
50
18
60.4
1.18
1.4
25
60.702
0.606
1.9
–2
100
400
TYP
MAX
INTV
CC
– 1
INTV
CC
– 1
1.25
UNITS
V
V
mV
V/V
MHz
V/µs
kΩ
dB
V
V
µA
ns
ns
kΩ
mA
kΩ
V
V
Remote Sense Amp (Note 3) (LTM4601A Only, Not Supported in the LTM4601A-1)
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
IN
= 12V, DIFFV
OUT
Load = 100k
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 LTM4601A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4601AE/LTM4601AE-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
LTM4601AI/LTM4601AI-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:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
4601afe
4
For more information
www.linear.com/LTM4601A
LTM4601A/LTM4601A-1
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
with 5V
IN
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
5
10
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
15
4601A G01
(See Figure 18 for all curves)
Efficiency vs Load Current
with 20V
IN
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
15
4601A G02
100
95
90
85
80
75
70
65
60
55
50
Efficiency vs Load Current
with 12V
IN
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
0
10
5
LOAD CURRENT (A)
50
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5.0V
OUT
0
10
5
LOAD CURRENT (A)
15
4601A G03
LOAD CURRENT (A)
1.2V Transient Response
V
OUT
50mV/DIV
I
OUT
5A/DIV
V
OUT
50mV/DIV
1.5V Transient Response
V
OUT
50mV/DIV
1.8V Transient Response
I
OUT
5A/DIV
I
OUT
5A/DIV
20µs/DIV
1.2V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601A G04
20µs/DIV
1.5V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601A G05
20µs/DIV
1.8V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601A G06
2.5V Transient Response
V
OUT
50mV/DIV
V
OUT
50mV/DIV
I
OUT
5A/DIV
3.3V Transient Response
I
OUT
5A/DIV
20µs/DIV
2.5V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601A G07
20µs/DIV
3.3V AT 6A/µs LOAD STEP
C
OUT
= 3 • 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601A G08
4601afe
For more information
www.linear.com/LTM4601A
5
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