mode DC/DC power supply. Included in the package are
the switching controller, power FETs, inductors, and all
supporting components. Operating from an input voltage
range of 4.5V to 16V, the LTM4620 supports two outputs
each with an output voltage range of 0.6V to 2.5V, set by a
single external resistor. Its high efficiency design delivers
up to 13A continuous current for each output. Only a few
input and output capacitors are needed.
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring. High
switching frequency and a current mode architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include overvoltage and overcur-
rent protection. The power module is offered in a proprietary
space saving and thermally enhanced 15mm
×
15mm
×
4.41mm LGA package with integrated top-side heat sink.
The LTM4620 is RoHS compliant with a PB-free finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
applicaTions
n
n
n
ViDeo Techclip
Click and Learn
100A and 26A Thermal Performance
Current Sharing
Short-Circuit Protection
Typical applicaTion
26A, 1.2V Output DC/DC µModule
®
Regulator
INTV
CC
4.7µF
5k
PGOOD
EFFICIENCY (%)
MODE_PLLIN CLKOUT INTV
CC
V
IN
4.5V TO 16V
10k*
22µF
×4
25V
V
IN
120k
TEMP
RUN1
RUN2
TRACK1
5.1V*
0.1µF
TRACK2
f
SET
PHASMD
121k
SGND
GND
DIFFP
DIFFN
LTM4620
EXTV
CC
PGOOD1
V
OUT1
V
OUTS1
DIFFOUT
SW1
V
FB1
V
FB2
COMP1
COMP2
V
OUTS2
V
OUT2
SW2
PGOOD2
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL
V
OUT
1.2V AT 26A
40
60.4k
50
5V
IN
/500kHz
12V
IN
/500kHz
0 2 4 6 8 10 12 14 16 18 20 22 24 26
OUTPUT CURRENT (A)
4620 TA01b
1.2V Efficiency vs I
OUT
90
80
100µF
6.3V
+
470µF
6.3V
70
60
+
100µF
6.3V
PGOOD
470µF
6.3V
4620 TA01a
4620f
1
LTM4620
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
TEMP
M
L
K
J
V
IN
(Note 8) ............................................... –0.3V to 18V
V
SW1
, V
SW2
................................................... –1V to 18V
PGOOD1, PGOOD2, RUN1, RUN2,
INTV
CC
, EXTV
CC
........................................... –0.3V to 6V
MODE_PLLIN, f
SET
, TRACK1, TRACK2,
DIFFOUT, PHASMD................................ –0.3V to INTV
CC
V
OUT1
, V
OUT2
, V
OUTS1
, V
OUTS2
...................... –0.3V to 6V
DIFFP DIFFN .......................................... –0.3V to INTV
CC
,
COMP1, COMP2, V
FB1
, V
FB2
(Note 6) ....... –0.3V to 2.7V
INTV
CC
Peak Output Current ................................100mA
Internal Operating Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range................... –55°C to 125°C
Peak Package Body Temperature .......................... 250°C
EXTV
CC
V
IN
CLKOUT
SW1
PHASMD
MODE_PLLIN
TRACK1
V
FB1
V
OUTS1
H
G
RUN1
F
SGND
GND
E
D
C
B
A
1
2
3
4
5
COMP1 COMP2
SGND V
FB2
TRACK2
f
SET
SGND V
OUTS2
GND
INTV
CC
SW2
PGOOD1
PGOOD2
RUN2
DIFFOUT
DIFFP
DIFFN
V
OUT1
GND
6
7
8
9
V
OUT2
10
11
12
LGA PACKAGE
144-LEAD (15mm
×
15mm
×
4.41mm)
T
JMAX
= 125°C,
Θ
JA
= 7°C/W,
Θ
JCbottom
= 1.5°C/W,
Θ
JCtop
= 3.7°C/W,
Θ
JB
+
Θ
BA
≅
7°C/W
Θ
VALUES DEFINED PER JESD 51-12
orDer inForMaTion
LEAD FREE FINISH
LTM4620EV#PBF
LTM4620IV#PBF
TRAY
LTM4620EV#PBF
LTM4620IV#PBF
PART MARKING*
LTM4620V
LTM4620V
PACKAGE DESCRIPTION
144-Lead (15mm
×
15mm
×
4.41mm) LGA
144-Lead (15mm
×
15mm
×
4.41mm) LGA
TEMPERATURE RANGE
–40°C to 125°C
–40°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/
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted. Per the typical application in Figure 23.
SYMBOL
V
IN
V
OUT
V
OUT1(DC)
,
V
OUT2(DC)
Input Specifications
V
RUN1
, V
RUN2
RUN Pin On/Off Threshold
RUN Rising
1.1
1.25
150
1.40
V
mV
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis
PARAMETER
Input DC Voltage
Output Voltage
Output Voltage, Total Variation with
Line and Load
(Note 8)
C
IN
= 22µF
×
3, C
OUT
= 100µF
×
1 Ceramic,
470µF POSCAP V
OUT
= 1.5V
,
CONDITIONS
l
l
l
elecTrical characTerisTics
MIN
4.5
0.6
1.477
TYP
MAX
16
2.5
UNITS
V
V
V
1.5
1.523
4620f
2
LTM4620
elecTrical characTerisTics
SYMBOL
I
INRUSH(VIN)
I
Q(VIN)
PARAMETER
Input Inrush Current at Start-Up
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted. Per the typical application in Figure 23.
CONDITIONS
I
OUT
= 0A, C
IN
= 22µF ×3, C
SS
= 0.01µF
,
C
OUT
= 100µF ×3, V
OUT1
= 1.5V, V
OUT2
= 1.5V,
V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, Burst Mode Operation
V
IN
= 12V, V
OUT
= 1.5V, Pulse-Skipping Mode
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 13A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 13A
V
IN
= 12V, V
OUT
= 1.5V (Notes 7, 8)
V
OUT
= 1.5V, V
IN
from 4.5V to 16V
I
OUT
= 0A for Each Output,
For Each Output, V
OUT
= 1.5V, 0A to 13A
V
IN
= 12V (Note 7)
For Each Output, I
OUT
= 0A, C
OUT
= 100µF ×3/
X7R/Ceramic, 470µF POSCAP V
IN
= 12V,
,
V
OUT
= 1.5V, Frequency = 400kHz
V
IN
= 12V, V
OUT
= 1.5V, f
SET
= 1.25V (Note 4)
400
,
C
OUT
= 100µF/X5R/Ceramic, 470µF POSCAP
V
OUT
= 1.5V, I
OUT
= 0A V
IN
= 12V
C
OUT
= 100µF/X5R/Ceramic, 470µF POSCAP
,
No Load, TRACK/SS with 0.01µF to GND,
V
IN
= 12V
Load: 0% to 50% to 0% of Full Load
C
OUT
= 22µF ×3/X5R/Ceramic, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF 470µF POSCAP
,
V
IN
= 12V, V
OUT
= 1.5V
10
5
l
l
MIN
TYP
1
MAX
UNITS
A
Input Supply Bias Current
5
15
65
50
4.6
1.853
0
0.01
0.5
15
13
0.025
0.75
mA
mA
mA
µA
A
A
A
%/V
%
mV
P-P
kHz
780
kHz
mV
ms
I
S(VIN)
Output Specifications
I
OUT1(DC)
, I
OUT2(DC)
ΔV
OUT1(LINE)
/V
OUT1
ΔV
OUT2(LINE)
/V
OUT2
ΔV
OUT1
/V
OUT1
ΔV
OUT2
/V
OUT2
Input Supply Current
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
V
OUT1(AC)
, V
OUT2(AC)
Output Ripple Voltage
f
S
(Each Channel)
f
SYNC
(Each Channel)
ΔV
OUTSTART
(Each Channel)
t
START
(Each Channel)
ΔV
OUT(LS)
(Each Channel)
t
SETTLE
(Each Channel)
I
OUT(PK)
(Each Channel)
Control Section
V
FB1
, V
FB2
I
FB1
, I
FB2
V
OVL
TRACK1 (I),
TRACK2 (I)
UVLO
UVLO Hysteresis
t
ON(MIN)
R
FBHI1
, R
FBHI2
V
PGOOD1
, V
PGOOD2
Low
I
PGOOD
Minimum On-Time
Resistor Between V
OUTS1
, V
OUTS2
and V
FB1
, V
FB2
Pins for Each Output
PGOOD Voltage Low
PGOOD Leakage Current
Feedback Overvoltage Lockout
Track Pin Soft-Start Pull-Up Current
Undervoltage Lockout
Voltage at V
FB
Pins
Output Ripple Voltage Frequency
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
500
Peak Deviation for Dynamic Load
30
mV
Settling Time for Dynamic Load
Step
Output Current Limit
20
20
µs
A
I
OUT
= 0A, V
OUT
= 1.5V
(Note 6)
l
0.592
0.64
1
0.600
–5
0.66
1.25
3.3
3.9
0.6
90
0.606
–20
0.68
1.5
V
nA
V
µA
V
V
V
ns
l
TRACK1 (I),TRACK2 (I) Start at 0V
V
IN
Falling
V
IN
Rising
(Note 6)
60.05
I
PGOOD
= 2mA
V
PGOOD
= 5V
60.4
0.1
60.75
0.3
±5
kΩ
V
µA
4620f
3
LTM4620
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted. Per the typical application in Figure 23.
SYMBOL
V
PGOOD
PARAMETER
PGOOD Trip Level
CONDITIONS
V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
6V < V
IN
< 16V
I
CC
= 0mA to 50mA
EXTV
CC
Ramping Positive
I
CC
= 20mA, V
EXTVCC
= 5V
4.5
4.8
MIN
TYP
–10
10
5
0.5
4.7
50
200
f
SET
= 1.2V
f
SET
= 0V (Note 5)
f
SET
> 2.4V, Up to INTV
CC
450
210
700
9
PHASMD = GND
PHASMD = Float
PHASMD = INTV
CC
2
500
250
780
10
250
60
90
120
0.2
1
Measured at DIFFP Input
V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA
5V < V
IN
< 16V
90
2
I
DIFFOUT
= 300µA
I = 100µA
INTV
CC
– 1.4
3
0.6
–2.2
80
3
550
290
860
11
100
5.2
2
MAX
UNITS
%
%
V
%
V
mV
mV
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
V/V
kΩ
mV
dB
mA
V
MHz
V
mV/°C
elecTrical characTerisTics
INTV
CC
Linear Regulator
V
INTVCC
V
INTVCC
Load Regulation
V
EXTVCC
V
EXTVCC(DROP)
V
EXTVCC(HYST)
Frequency Nominal
Frequency Low
Frequency High
f
SET
R
MODE_PLLIN
CLKOUT
Internal V
CC
Voltage
INTV
CC
Load Regulation
EXTV
CC
Switchover Voltage
EXTV
CC
Dropout
EXTV
CC
Hysteresis
Nominal Frequency
Lowest Frequency
Highest Frequency
Frequency Set Current
MODE_PLLIN Input Resistance
Phase (Relative to V
OUT1
)
Clock High Output Voltage
Clock Low Output Voltage
Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
Diode Connected PNP
Temperature Coefficient
Oscillator and Phase-Locked Loop
CLK High
CLK Low
Differential Amplifier
A
V
Differential
Amplifier
R
IN
V
OS
PSRR Differential
Amplifier
I
CL
V
OUT(MAX)
GBW
V
TEMP
Temp Diode
TC
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 LTM4620 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4620E is guaranteed to meet specifications from
0°C to 125°C internal temperature. Specifications over the –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM4620I is guaranteed 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
impedance and other environmental factors.
Note 3:
Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4:
The switching frequency is programmable from 400kHz to 750kHz.
Note 5:
LTM4620 device is designed to operate from 400kHz to 750kHz
Note 6:
These parameters are tested at wafer sort.
Note 7:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 8:
Output current limitations. For 10V ≤ V
IN
≤ 16V, the 2.5V output
current needs to be limited to 10A/channel, switching frequency = 750kHz.
Derating curves apply. For 5V ≤ V
IN
≤ 9V, the 2.5V output current needs
to be limited to 12A/channel, switching frequency = 750kHz. Derating
curves apply. All other input and output combinations are 13A/channel
with recommended switching frequency included in the efficiency graphs.
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