LTM4636
40A DC/DC µModule
Regulator
FeaTures
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DescripTion
The
LTM
®
4636
is a 40A step-down µModule (power
module) switching regulator with a stacked inductor as a
heat sink for quicker heat dissipation and cooler operation
in a small package. The exposed inductor permits direct
contact with airflow from any direction. The LTM4636
can deliver 40W (12V
IN
, 1V
OUT
, 40A, 200LFM) with only
40°C rise over the ambient temperature. Full-power 40W
is delivered, up to 83°C ambient and half-power 20W is
supported at 110°C ambient.
The LTM4636 operates at 92%, 90% and 88% efficiency,
delivering 15A, 30A and 40A, respectively, to a 1V load
(12V
IN
). The µModule regulator is scalable such that four
µModules in current sharing mode deliver 160W with only
40°C rise and 88% efficiency (12V
IN
, 1V
OUT
, 400LFM).
The LTM4636 is offered in a 16mm × 16mm × 7.07mm
BGA package.
L,
LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology, LTpowerCAD and the
Linear logo are registered 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, 8163643.
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Stacked Inductor Acts as Heat Sink
Wide Input Voltage Range: 4.7V to 15V
0.6V to 3.3V Output Voltage Range
±1.3% Total DC Output Voltage Error Over Line,
Load and Temperature (–40°C to 125°C)
Differential Remote Sense Amplifier for Precision
Regulation
Current Mode Control/Fast Transient Response
Frequency Synchronization
Parallel Current Sharing (Up to 240A)
Internal or External Compensation
88% Efficiency (12V
IN
, 1V
OUT
) at 40A
Overcurrent Foldback Protection
16mm
×
16mm
×
7.07mm BGA Package
applicaTions
n
n
Telecom Servers and Networking Equipment
Industrial Equipment and Medical Systems
Typical applicaTion
1V, 40A DC/DC µModule Regulator
V
IN
≤ 5.5V, TIE V
IN
, INTV
CC
AND PV
CC
TOGETHER, TIE RUNP TO GND.
V
IN
> 5.5V, THEN OPERATE AS SHOWN
100
PV
CC
INTV
CC
V
IN
INTV
CC
PV
CC
RUNC
LTM4636
RUNP
HIZREG
FREQ
TRACK/SS
MODE/PLLIN
SNSP1
SNSP2
PINS NOT USED IN THIS CIRCUIT:
CLKOUT, GMON, PGOOD, PHMODE, PWM,
SW, TEST1, TEST2, TEST3, TEST4, TMON
OPTIONAL TEMP MONITOR
COMPA
COMPB
TEMP
+
TEMP
–
V
FB
SGND PGND
7.5k
4636 TA01a
12V
IN
, 1V
OUT
Efficiency
vs Output Current
4.70V TO
15V
95
EFFICIENCY (%)
22µF
90
85
80
75
470µF
6.3V
×3
100µF
6.3V
×4
70
+
PV
CC
100µF
25V
22µF
16V
×5
15k
0.1µF
INTV
CC
34.8k
V
OUT
V
OUTS1+
1V
V
OUT
1V, 40A
+
V
OUTS1–
0
5
10 15 20 25 30
OUTPUT CURRENT (A)
35
40
4636 TA01b
4636f
For more information
www.linear.com/LTM4636
1
LTM4636
absoluTe MaxiMuM raTings
(Note 1)
V
IN
, SW, HZBREG, RUNP ........................... –0.3V to 16V
V
OUT
.......................................................... –0.3V to 3.5V
PGOOD, RUNC, TMON, PV
CC
, MODE/PLLIN, PHMODE,
FREQ, TRACK/SS, TEST1, TEST2, V
OUTS1–
, V
OUTS1+
,
SNSP1, SNSP2, TEST3, TEST4 ..... –0.3V to INTV
CC
(5V)
V
FB
, COMPA, COMPB (Note 7).................. –0.3V to 2.7V
PV
CC
Additional Output Current ................ 0mA to 50mA
Note: PWM, CLKOUT, and GMON are outputs only.
TEMP
+
, TEMP
–
.......................................... –0.3V to 0.8V
INTV
CC
Peak Output Current (Note 6) ....................20mA
Internal Operating Temperature Range
(Note 2).................................................. –40°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Reflow (Peak Body) Temperature .......................... 250°C
pin conFiguraTion
TOP VIEW
V
OUTS1–
V
OUTS1+
COMPB
1
A
B
TEST2
HIZREG
SNSP1
SNSP2
SGND
CLKOUT
TRACK/SS
RUNC
PGOOD
C
D
E
F
G
H
J
K
L
M
BGA PACKAGE
144-LEAD (16mm
×
16mm
×
7.07mm)
GND
V
IN
TEST3
V
FB
COMPA
INTV
CC
FREQ GND
TEST1
PWM TMON
GND
NC
GND
2
3
4
5
6
7
8
9
10
11
12
V
OUT
TEST4 (FLOAT PIN)
PHASMD
RUNP
PV
CC
TEMP
–
TEMP
+
GMON
MODE/PLLIN
SW
T
JMAX
= 125°C,
θ
JA
= 7.5°C/W,
θ
JCbottom
= 3°C/W,
θ
JCtop
= 15°C/W,
θ
JBA
= 12°C/W
θ
JA
= DERIVED FROM 95mm
×
76mm PCB WITH 6 LAYERS, WEIGHT = 3.95g
θ
VALUES DETERMINED PER JESD51-12
Note:
θ
JA
= (θ
JCbottom
+
θ
JBA
)||θ
JCtop
;
θ
JBA
is Board to Ambient
orDer inForMaTion
PART NUMBER
LTM4636EY#PBF
LTM4636IY#PBF
PAD OR BALL FINISH
SAC305 (RoHS)
http://www.linear.com/product/LTM4636#orderinfo
PART MARKING*
DEVICE
LTM4636
FINISH CODE
PACKAGE
TYPE
BGA
MSL
RATING
TEMPERATURE RANGE
(SEE NOTE 2)
–40°C to 125°C
–40°C to 125°C
•
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
•
This product is not recommended for second side reflow. For more
information, go to
www.linear.com/BGA-assy
•
Recommended BGA PCB Assembly and Manufacturing Procedures:
www.linear.com/BGA-assy
•
BGA Package and Tray Drawings:
www.linear.com/packaging
•
This product is moisture sensitive. For more information, go to:
www.linear.com/BGA-assy
4636f
2
For more information
www.linear.com/LTM4636
LTM4636
elecTrical characTerisTics
SYMBOL
V
IN
V
OUT
V
OUT(DC)
PARAMETER
Input DC Voltage
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 12V, per the Typical Application in Figure 20.
CONDITIONS
V
IN
≤ 5.5V, Tie V
IN
, INTV
CC
and PV
CC
Together, Tie RUNP
to GND
l
l
l
MIN
4.7
0.6
1.4805
TYP
MAX
15
3.3
1.5195
UNITS
V
V
V
V
OUT
Range
DC Output Voltage, Total
C
IN
= 22µF
×
5
Variation with Line and Load C
OUT
= 100µF
×
4 Ceramic, 470µF POSCAP
×
3
R
FB
= 40.2k, MODE_PLLIN = GND
V
IN
= 4.75V to 15V, I
OUT
= 0A to 40A (Note 4)
Input Specifications
RUNC Pin On Threshold
V
RUNC
Rising
V
RUNC
RUNC Pin On Hysteresis
V
RUNCHYS
RUNP Pin On Threshold
RUNP Pin Rising
V
RUNP
RUNP HYS
RUNP Pin Hysteresis
HIZREG
HIZREG Input Threshold
V
IN
= 12V, RUNC = 5V, RUNP = V
IN
, V
OUT
= 1.5V
HIZREG HYS
HIZREG Hysteresis
V
IN
= 12V, RUNC = 5V, RUNP = V
IN
, V
OUT
= 1.5V
Input Supply Bias Current
V
IN
= 12V, V
OUT
= 1.5V, Burst Mode Operation, I
OUT
= 0.1A
I
Q(VIN)
V
IN
= 12V, V
OUT
= 1.5V, Pulse-Skipping Mode, I
OUT
= 0.1A
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous, I
OUT
= 0.1A
Shutdown, RUN = 0, V
IN
= 12V
Input Supply Current
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 40A
I
S(VIN)
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 40A
Output Specifications
Output Continuous Current V
IN
= 12V, V
OUT
= 1.5V (Note 4)
I
OUT(DC)
Range
∆V
OUT
(Line)
Line Regulation Accuracy
V
OUT
= 1.5V, V
IN
from 4.75V to 15V
V
OUT
I
OUT
= 0A
∆V
OUT
(Load)
Load Regulation Accuracy
V
OUT
= 1.5V, I
OUT
= 0A to 40A, V
IN
= 12V (Note 4)
V
OUT
V
OUT(AC)
Output Ripple Voltage
I
OUT
= 0A, C
OUT
= 100µF
×
3 Ceramic, 470µF
×
3 POSCAP,
V
IN
= 12V, V
OUT
= 1.5V
∆V
OUT(START)
Turn-On Overshoot
C
OUT
= 100µF
×
4 Ceramic, 470µF
×
3 POSCAP,
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
= 12V, TRACK/SS = 0.1µF
t
START
Turn-On Time
C
OUT
= 100µF
×
3 Ceramic, 470µF
×
3 POSCAP,
No Load, TRACK/SS = 0.001µF, V
IN
= 12V
∆V
OUTLS
Peak Deviation for Dynamic Load: 0% to 50% to 0% of Full Load
Load
C
OUT
= 100µF
×
4 Ceramic, 470µF
×
3 POSCAP,
V
IN
= 12V, V
OUT
= 1.5V, CFF = 22pF
Settling Time for Dynamic
Load: 0% to 50% to 0% of Full Load, V
IN
= 5V,
t
SETTLE
Load Step
C
OUT
= 100µF
×
4 Ceramic, 470µF
×
3 POSCAP,
V
IN
= 12V, V
OUT
= 1.5V, CFF = 22pF
Output Current Limit
V
IN
= 12V, V
OUT
= 1.5V
I
OUTPK
V
IN
= 5V, V
OUT
= 1.5V
Control Section
Voltage at V
FB
Pin
I
OUT
= 0A, V
OUT
= 1.5V
V
FB
Current at V
FB
Pin
(Note 6)
I
FB
Feedback Overvoltage
Measure at V
OUTS1
V
OVL
Lockout
I
TRACK/SS
Track Pin Soft-Start Pull-Up TRACK/SS = 0V, Default 750µs Turn on with TRACK/SS
Current
Tied to INTV
CC
t
ON(MIN)
Minimum On-Time
(Note 3)
Resistor Between V
OUTS1
R
FBHI
and V
FB
Pins
1.5
1.1
l
0.7
1.22
150
0.8
60
2.3
0.8
16
23
105
30
14.7
5.66
1.35
0.9
V
mV
V
mV
V
V
mA
mA
mA
µA
A
A
A
%/V
%
mV
P-P
mV
ms
mV
µs
A
A
0
l
l
40
0.02
0.2
15
5
50
45
25
54
54
0.06
0.35
l
0.594
5
1.1
l
0.600
–30
7.5
1.35
100
4.99
0.606
–100
10
1.6
V
nA
%
µA
ns
kΩ
4636f
For more information
www.linear.com/LTM4636
3
LTM4636
elecTrical characTerisTics
SYMBOL
PARAMETER
Remote Sense Amplifier
V
FB
Differential Gain
A
V(VFB)
Gain Bandwidth Product
GBP V
FB
Path
General Control or Monitor Pins
I
TMON
I
TMON(SLOPE)
V
PGOOD
V
PGL
t
PGOOD
I
PGOOD(OFF)
V
PG1(HYST)
CONDITIONS
(Note 6)
(Note 5)
Temperature Monitor Current, T
J
= 25°C Into 25kΩ
Temperature Monitor Current, T
J
= 150°C Into 25kΩ
Temperature Monitor Current Slope, R
TMON
= 25kΩ
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
I
PGOOD
= 2mA
V
PGOOD
= 5V
38
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 12V, per the typical application in Figure 20.
MIN
TYP
1
4
40.3
58
0.144
–7.5
7.5
0.2
65
–2
2.5
44
MAX
UNITS
V/V
MHz
µA
µA
µA/°C
%
%
0.4
2
V
µs
µA
%
PGOOD Trip Level
PGOOD Voltage Low
V
PGOOD
High-to-Low Delay
PGOOD Leakage Current
PGOOD Trip Level
Hysteresis
INTV
CC
Linear Regulator
Internal V
CC
Voltage Source
V
INTVCC
V
INTVCC
Load Reg INTV
CC
Load Regulation
UVLO HYS
Controller UVLO Hysteresis
Drivers and Power
PV
CC(UVLO)
MOSFETs UVLO
PV
CC
UVLO Hysteresis
PV
CC(HYS)
Power Stage Bias
PV
CC
Oscillator and Phase-Locked Loop
Oscillator Frequency
f
OSC
V
PHSMD
= 0V
6V < V
IN
< 15V
I
CC
= 0mA to 10mA
(Note 6)
PV
CC
Rising
5.3
3.5
5.5
0.5
0.5
3.8
0.45
5.0
5.7
4.1
V
%
V
V
V
V
12V Input, PV
CC
Load = 50mm
R
FREQ
= 30.1kΩ
R
FREQ
= 47.5kΩ
R
FREQ
= 54.9kΩ
R
FREQ
= 75.0kΩ
Maximum Frequency
Minimum Frequency
V
FREQ
= 0.8V
210
540
625
945
1.2
19
250
600
750
1.05
20
250
2
1.2
0.2
5.2
90
90
120
60
180
290
660
825
1.155
0.2
21
l
l
I
FREQ
R
MODE/PLLIN
V
MODE/PLLIN
V
CLKOUT
PWM-CLKOUT
FREQ Pin Output Current
MODE_PLLIN Input
Resistance
PLLIN Input Threshold
Low Output Voltage
High Output Voltage
PWM to Clockout Phase Delay
kHz
kHz
kHz
MHz
MHz
MHz
µA
kΩ
V
V
V
V
Deg
Deg
Deg
Deg
Deg
V
V
V
MODE/PLLIN
Rising
V
MODE/PLLIN
Falling
Verified Levels
Measurements on CLKOUT
V
PHSMD
= 0V
V
PHSMD
= 1/4 INTV
CC
V
PHSMD
= Float
V
PHSMD
= 3/4 INTV
CC
V
PHSMD
= INTV
CC
I
LOAD
= 500µA
I
LOAD
= –500µA
5.0
PWM/PWMEN Outputs
PWM
PWM Output High Voltage
PWM Output Low Voltage
0.5
4636f
4
For more information
www.linear.com/LTM4636
LTM4636
elecTrical characTerisTics
SYMBOL
PARAMETER
Temperature Diode
Diode Forward Voltage
Diode V
F
TC
Temperature Coefficient
CONDITIONS
I = 100µA, TEMP
+
to TEMP
–
l
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 12V, per the typical application in Figure 20.
MIN
TYP
0.598
–2.0
MAX
UNITS
V
mV/°C
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 LTM4636 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4636E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the full –40°C to 125°C internal operating temperature range are
assured by design, characterization and correlation with statistical process
controls. The LTM4636I is guaranteed to meet specifications over the
full –40°C to 125°C internal operating temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 3:
The minimum on-time condition is specified for a peak-to-peak
inductor ripple current of ~40% of I
MAX
Load. (See the Applications
Information section)
Note 4:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 5:
Guaranteed by design.
Note 6:
100% tested at wafer level.
Typical perForMance characTerisTics
100
95
EFFICIENCY (%)
EFFICIENCY (%)
90
85
80
75
70
3.3V
OUT
, 500kHz
2.5V
OUT
, 500kHz
1.8V
OUT
, 450kHz
1.5V
OUT
, 425kHz
1.2V
OUT
, 300kHz
1V
OUT
, 300kHz
0
5
10 15 20 25 30
OUTPUT CURRENT (A)
35
40
Efficiency vs Load Current
with 5V
IN
100
95
Efficiency vs Load Current with
8V
IN
100
95
EFFICIENCY (%)
90
85
80
75
70
Efficiency vs Load Current with
12V
IN
90
85
80
75
70
3.3V
OUT
, 700kHz
2.5V
OUT
, 600kHz
1.8V
OUT
, 500kHz
1.5V
OUT
, 450kHz
1.2V
OUT
, 400kHz
1V
OUT
, 350kHz
0
5
10 15 20 25 30
OUTPUT CURRENT (A)
35
40
3.3V
OUT
, 750kHz
2.5V
OUT
, 650kHz
1.8V
OUT
, 600kHz
1.5V
OUT
, 550kHz
1.2V
OUT
, 400kHz
1V
OUT
, 350kHz
0
5
10 15 20 25 30
OUTPUT CURRENT (A)
35
40
4636 G01
4636 G02
4636 G03
Burst Mode Efficiency
vs Load Current
100
90
EFFICIENCY (%)
80
70
60
50
40
Burst Mode OPERATION
V
IN
12V
V
OUT
1.5V
50mV/DIV
50µs/DIV
10A/DIV
18A/µs
STEP
1V Transient Response
50mV/DIV
50µs/DIV
1.2V Transient Response
10A/DIV
18A/µs
STEP
4636 G05
4636 G06
12V TO 1V TRANSIENT RESPONSE
C
OUT
= 4 × 100µF CERAMIC, 3 × 470µF 2.5V
POSCAP 5m
,
C
FF
= 22pF SW FREQ = 400kHz
12V TO 1.2V TRANSIENT RESPONSE
C
OUT
= 4 × 100µF CERAMIC, 3 × 470µF 2.5V
POSCAP 5m
,
C
FF
= 22pF SW FREQ = 400kHz
C
COMP
= 100pF
0
1
2
3
4
OUTPUT CURRENT (A)
5
4636 G04
4636f
For more information
www.linear.com/LTM4636
5
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