FEATURES
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LTM4601/LTM4601-1
12A DC/DC µModules
with PLL, Output Tracking
and Margining
DESCRIPTIO
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
TM
is housed in a small surface mount 15mm
×15mm ×
2.8mm LGA package. Operating over an input
voltage range of 4.5 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 delivers
12A continuous current (14A peak). Only bulk input and
output capacitors are needed to complete the design.
The low profile (2.8mm) and light weight (1.7g) pack-
age easily mounts in unused space on the back side of
PC boards for high density point of load regulation. The
µModule 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.
, LTC, LT 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.
Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589,
6774611, 6677210
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 µModules for Current Sharing
Differential Remote Sensing for Precision
Regulation (LTM4601 Only)
PLL Frequency Synchronization
±1.5% Regulation
Current Foldback Protection (Disabled at Start-Up)
Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
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 ×
2.8mm) Surface Mount LGA Package
APPLICATIO S
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Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
TYPICAL APPLICATIO
V
IN
4.5V TO 20V
V
IN
PGOOD
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
1.5V/12A Power Supply with 4.5V to 20V Input
95
CLOCK SYNC
TRACK/SS CONTROL
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
f
SET
R
SET
40.2k
4601 TA01a
Efficiency and Power Loss
vs Load Current
4.0
EFFICIENCY
90
V
OUT
1.5V
12A
85
EFFICIENCY (%)
80
75
70
65
60
POWER LOSS
55
50
0
2
4
6
8
10
OUTPUT CURRENT (A)
12
14
1.0
0.5
12V
IN
5V
IN
2.0
1.5
5V
IN
3.5
12V
IN
3.0
2.5
100pF
MARGIN
CONTROL
ON/OFF
C
IN
LTM4601
C
OUT
R1
392k
5% MARGIN
PGND
U
U
U
POWER LOSS (W)
4601 TA01b
4601f
1
LTM4601/LTM4601-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
INTV
CC
PLLIN
TRACK/SS
RUN
COMP
MPGM
TOP VIEW
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
– 1V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range................... –55°C to 125°C
V
IN
PGND
V
OUT
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
LGA PACKAGE
118-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
*LTM4601-1 ONLY
ORDER PART NUMBER
LTM4601EV#PBF
LTM4601IV#PBF
LTM4601EV-1#PBF
LTM4601IV-1#PBF
LGA PART MARKING*
LTM4601V
LTM4601V
LTM4601V-1
LTM4601V-1
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
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
4.5
1.478
1.478
TYP
MAX
20
UNITS
V
V
V
V
A
A
mA
mA
mA
mA
µA
A
A
A
4601f
C
IN
= 10µF
×3,
C
OUT
= 200µF
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, V
OUT
= 1.5V, No Switching
V
IN
= 12V, V
OUT
= 1.5V, Switching
Continuous
V
IN
= 5V, V
OUT
= 1.5V, No Switching
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, VIN = 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
●
●
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
4
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Undervoltage Lockout Threshold
Input Inrush Current at Startup
I
Q(VIN,NOLOAD)
Input Supply Bias Current
I
S(VIN)
Input Supply Current
2
U
W
U
U
W W
W
LTM4601/LTM4601-1
ELECTRICAL CHARACTERISTICS
SYMBOL
INTV
CC
I
OUTDC
ΔV
OUT(LINE)
V
OUT(MIN)
ΔV
OUT(0A-12A)
V
OUT(MIN)
V
OUT(AC)
Output Ripple Voltage
Load Regulation Accuracy
V
OUT
= 1.5V, 0A to 12A
V
IN
= 12V, 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
V
IN
= 12V
V
IN
= 5V
C
OUT
= 200µF, V
OUT
= 1.5V, I
OUT
= 1A
Resisitive 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
●
●
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.
PARAMETER
V
IN
= 12V, RUN > 2V
CONDITIONS
No Load
MIN
4.7
0
TYP
5
MAX
5.3
12
UNITS
V
A
Output Specifications
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
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
from 4.5V to 20V
●
0.3
%
0.25
1
20
18
850
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
0.7
ms
ms
ΔV
OUTLS
Peak Deviation for Dynamic Load
35
35
25
17
17
0
0
1
3
2
INTV
CC
– 1
INTV
CC
1.25
mV
mV
µs
A
A
V
V
mV
V/V
MHz
V/µs
kΩ
dB
0.606
1.9
–2.0
100
V
V
µA
ns
4601f
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, Table 2
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
SS/TRACK
t
ON(MIN)
Error Amplifier Input Voltage
Accuracy
RUN Pin On/Off Threshold
Soft-Start Charging Current
Minimum On Time
V
SS/TRACK
= 0V
(Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
●
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, DIFF OUT Load = 100k
20
100
0.594
1
–1.0
0.6
1.5
–1.5
50
3
LTM4601/LTM4601-1
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.
SYMBOL
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
13
–13
%
%
%
PARAMETER
Minimum Off Time
PLLIN Input Resistance
Current into DRV
CC
Pin
Resistor Between V
OUT
and V
FB
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 1.5V, I
OUT
= 1A, Frequency = 850kHz,
DRV
CC
= 5V
60.098
CONDITIONS
(Note 4)
MIN
TYP
250
50
18
60.4
1.18
1.4
25
60.702
MAX
400
UNITS
ns
kΩ
mA
kΩ
V
V
ELECTRICAL CHARACTERISTICS
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 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 and tested over the –40°C to 85°C temperature range.
Note 3:
Remote sense amplifier recommended for ≤3.3V output.
Note 4:
100% tested at wafer level only.
4601f
4
LTM4601/LTM4601-1
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 18 for all curves)
Efficiency vs Load Current
with 5V
IN
100
95
90
EFFICIENCY (%)
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 (%)
OUTPUT CURRENT (A)
1.2V Transient Response
V
OUT
50mV/DIV
I
OUT
5A/DIV
V
OUT
50mV/DIV
20
µ
s/DIV
1.2V AT 6A/
µ
s LOAD STEP
C
OUT
= 3 • 22
µ
F 6.3V CERAMICS
470
µ
F 4V SANYO POSCAP
C3 = 100pF
2.5V Transient Response
V
OUT
50mV/DIV
V
OUT
50mV/DIV
I
OUT
5A/DIV
20
µ
s/DIV
2.5V AT 6A/
µ
s LOAD STEP
C
OUT
= 3 • 22
µ
F 6.3V CERAMICS
470
µ
F 4V SANYO POSCAP
C3 = 100pF
U W
Efficiency vs Load Current
with 12V
IN
100
95
90
85
80
75
70
65
60
55
50
0
10
5
OUTPUT CURRENT (A)
15
4601 G02
Efficiency vs Load Current
with 20V
IN
100
95
90
85
80
75
70
65
60
0
10
5
OUTPUT CURRENT (A)
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5.0V
OUT
15
4601 G03
0.6V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
5V
OUT
1.5V Transient Response
V
OUT
50mV/DIV
1.8V Transient Response
I
OUT
5A/DIV
I
OUT
5A/DIV
4601 G04
20
µ
s/DIV
1.5V AT 6A/
µ
s LOAD STEP
C
OUT
= 3 • 22
µ
F 6.3V CERAMICS
470
µ
F 4V SANYO POSCAP
C3 = 100pF
4601 G05
20
µ
s/DIV
1.8V AT 6A/
µ
s LOAD STEP
C
OUT
= 3 • 22
µ
F 6.3V CERAMICS
470
µ
F 4V SANYO POSCAP
C3 = 100pF
4601 G06
3.3V Transient Response
I
OUT
5A/DIV
20
µ
s/DIV
3.3V AT 6A/
µ
s LOAD STEP
C
OUT
= 3 • 22
µ
F 6.3V CERAMICS
470
µ
F 4V SANYO POSCAP
C3 = 100pF
4601 G07
4601 G08
4601f
5
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