and higher efficiency than the LTM4620. 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 LTM4620A supports two
outputs each with an output voltage range of 0.6V to 5.3V,
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, multiphase
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 over-
current protection. The power module is offered in a
proprietary space saving and thermally enhanced 15mm
×
15mm
×
4.41mm LGA package. The LTM4620A is
RoHS compliant.
n
n
n
n
n
n
n
n
n
n
Dual 13A or Single 26A Output
Wide Input Voltage Range: 4.5V to 16V
Output Voltage Range: 0.6V to 5.3V
±1.5% Maximum Total DC Output Error
Multiphase Current Sharing with Multiple
LTM4620As Up to 100A
Higher Efficiency and Wider V
OUT
Range Than LTM4620
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Overcurrent Foldback Protection
Frequency Synchronization
Internal Temperature Sensing Diode Output
Output Overvoltage Protection
Pin Compatible with the LTM4628 (Dual 8A) and
LTM4620 (Dual 13A)
15mm
×
15mm
×
4.41mm LGA Package
applicaTions
n
n
Telecom and Networking Equipment
Industrial Equipment
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical applicaTion
26A, 5V Output DC/DC µModule
®
Regulator
INTV
CC
4.7µF
V
OUT
MODE_PLLIN CLKOUT INTV
CC
10k*
22µF
25V
×4
V
IN
120k
TEMP
RUN1
RUN2
5.1V*
0.1µF INTV
CC
TRACK1
TRACK2
f
SET
PHASMD
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL
LTM4620A
INTV
CC
5k
PGOOD
100
5V Efficiency vs I
OUT
V
OUTS1
DIFFOUT
SW1
V
FB1
V
FB2
COMP1
COMP2
V
OUTS2
V
OUT2
SW2
PGOOD2
EFFICIENCY (%)
V
IN
7V TO 16V
EXTV
CC
PGOOD1
V
OUT1
100µF
6.3V
×2
220pF
95
90
8.25k
85
8V TO 5V EFF (650kHz)
12V TO 5V EFF (750kHz)
100µF
6.3V
×2
V
OUT
5V
26A
80
1
3
5 8 10 12 14 16 19 21 23
TOTAL OUTPUT CURRENT (A)
4620A TA01b
SGND
GND
DIFFP
DIFFN
PGOOD
4620A TA01a
4620af
For more information
www.linear.com/4620A
1
LTM4620A
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
(Mount on Top Side of PCB Only) ......................... 245°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
JBA
≅
7°C/W, weight = 3.037g
Θ
VALUES DEFINED PER JESD 51-12
orDer inForMaTion
LEAD FREE FINISH
LTM4620AEV#PBF
LTM4620AIV#PBF
TRAY
LTM4620AEV#PBF
LTM4620AIV#PBF
PART MARKING*
LTM4620AV
LTM4620AV
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. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted. Per the typical application in Figure 26.
SYMBOL
V
IN
V
OUT
V
OUT1(DC)
,
V
OUT2(DC)
Input Specifications
V
RUN1
, V
RUN2
I
INRUSH(VIN)
RUN Pin On/Off Threshold
Input Inrush Current at Start-Up
RUN Rising
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
1.1
1.25
150
1
1.40
V
mV
A
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,
220µF POSCAP
CONDITIONS
l
l
l
elecTrical characTerisTics
MIN
4.5
0.6
1.477
TYP
MAX
16
5.3
UNITS
V
V
V
1.5
1.523
4620af
2
For more information
www.linear.com/4620A
LTM4620A
elecTrical characTerisTics
SYMBOL
I
Q(VIN)
PARAMETER
Input Supply Bias Current
The
l
denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted. Per the typical application in Figure 26.
CONDITIONS
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 4.75V 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
10
5
5
30
l
l
MIN
TYP
5
15
65
50
4.6
1.853
MAX
UNITS
mA
mA
mA
µA
A
A
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
0
0.01
0.35
15
13
0.025
0.5
A
%/V
%
mV
P-P
kHz
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
FB
V
OVL
TRACK1 (I),
TRACK2 (I)
UVLO
UVLO Hysteresis
t
ON(MIN)
R
FBHI1
, R
FBHI2
V
PGOOD1
, V
PGOOD2
Low
I
PGOOD
V
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
PGOOD Trip Level
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
780
kHz
mV
mV
ms
ms
mV
Peak Deviation for Dynamic Load
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)
59.90
I
PGOOD
= 2mA
V
PGOOD
= 5V
V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
60.4
0.1
60.75
0.3
±5
kΩ
V
µA
%
%
4620af
–10
10
For more information
www.linear.com/4620A
3
LTM4620A
The
l
denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted. Per the typical application in Figure 26.
SYMBOL
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
PARAMETER
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
I = 100µA
l
elecTrical characTerisTics
INTV
CC
Linear Regulator
CONDITIONS
6V < V
IN
< 16V
I
CC
= 0mA to 50mA
EXTV
CC
Ramping Positive
I
CC
= 20mA, V
EXTVCC
= 5V
MIN
4.8
TYP
5
0.5
MAX
5.2
2
UNITS
V
%
V
4.5
4.7
50
200
100
mV
mV
Oscillator and Phase-Locked Loop
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
INTV
CC
– 1.4
3
0.6
2.2
80
3
550
290
860
11
kHz
kHz
kHz
µA
kΩ
Deg
Deg
Deg
V
V
V
kΩ
mV
dB
mA
V
MHz
V
mV/C
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
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 LTM4620A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4620AE 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
LTM4620AI 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:
The LTM4620A 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 5V output
current needs to be limited to 12A/channel, switching frequency = 750kHz.
Derating curves apply. For 7V ≤ V
IN
≤ 9V, the 5V output current needs
to be limited to 13A/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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