LTM4623
Ultrathin 20V
IN
, 3A Step-Down
DC/DC µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4623
is a complete 3A step-down switching
mode µModule (micromodule) regulator in a tiny ultrathin
6.25mm
×
6.25mm
×
1.82mm LGA and 6.25mm
×
6.25mm
×
2.42mm BGA packages. Included in the package are the
switching controller, power FETs, inductor and support
components. Operating over an input voltage range of
4V to 20V or 2.375V to 20V with an external bias supply,
the LTM4623 supports an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers 3A continuous output current. Only ceramic
input and output capacitors are needed.
The LTM4623 supports selectable discontinuous mode
operation and output voltage tracking for supply rail se-
quencing. Its high switching frequency and current mode
control enable a very fast transient response to line and
load changes without sacrificing stability.
Fault protection features include overvoltage, overcurrent
and overtemperature protection.
The LTM4623 is available with SnPb (BGA) or RoHS
compliant terminal finish.
All registered trademarks and trademarks are the property of their respective owners.
n
<2mm Height, Complete Solution in <1cm
2
(Single-Sided PCB) or 0.5cm
2
(Dual-Sided PCB)
Wide Input Voltage Range: 4V to 20V
Input Voltage Down to 2.375V with External Bias
0.6V to 5.5V Output Voltage
3A DC Output Current
±1.5% Maximum Total DC Output Voltage Error
Current Mode Control, Fast Transient Response
Low EMI EN55022 Class B Compliant
External Frequency Synchronization
Multiphase Operation with Current Sharing
Output Voltage Tracking
Selectable Discontinuous Mode
Power Good Indicator
Overvoltage, Overcurrent and Overtemperature Pro-
tection
Ultrathin (6.25mm
×
6.25mm
×
1.82mm) LGA Package
and (6.25mm
×
6.25mm
×
2.42mm) BGA Package
APPLICATIONS
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PCIe and Backside PCB Mounting
Telecom, Datacom, Networking and Industrial
Equipment
Data Storage Rack Units and Cards
TYPICAL APPLICATION
3A, 1.5V Output DC/DC µModule
®
Step-Down Regulator
V
OUT
1.5V
47µF 3A
6.3V
1.5V Output Efficiency vs Load Current
95
90
10µF
25V
EFFICIENCY (%)
V
IN
4V TO 20V
0.1µF
CLKIN
CLKOUT
V
IN
V
OUT
SV
IN
RUN
LTM4623
PGOOD
INTV
CC
MODE
COMP
FB
PHMODE
TRACK/SS
FREQ
GND SGND
4623 TA01a
85
80
75
70
40.2k
65
60
0
0.5
1
2
1.5
LOAD CURRENT (A)
V
IN
= 5V
V
IN
= 12V
2.5
3
4623 TA01b
Rev D
Document Feedback
For more information
www.analog.com
1
LTM4623
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
CLKOUT
CLKIN
SV
IN
SGND
FREQ
RUN
5
4
(See Pin Functions, Pin Configuration Table)
V
IN
, SV
IN
.................................................... –0.3V to 22V
V
OUT
.................................................–0.3V to SV
IN
or 6V
RUN ........................................................... –0.3V to 22V
INTV
CC
...................................................... –0.3V to 3.6V
PGOOD, MODE, TRACK/SS, FREQ,
PHMODE, CLKIN .................................. –0.3V to INTV
CC
Internal Operating Junction Temperature Range
(Notes 2, 5) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Peak Solder Reflow Body Temperature ................. 260°C
V
IN
MODE
INTV
CC
GND
PGOOD
V
OUT
3
PHMODE
TRACK/SS 2
FB
COMP
1
A
B
C
D
E
LGA PACKAGE 25-LEAD (6.25mm
×
6.25mm
×
1.82mm)
BGA PACKAGE 25-LEAD (6.25mm
×
6.25mm
×
2.42mm)
T
JMAX
= 125°C,
θ
JCtop
= 17°C/W,
θ
JCbottom
= 11°C/W,
θ
JB
+
θ
BA
= 22°C/W,
θ
JA
= 22°C/W,
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS
θ
VALUES DETERMINED PER JESD51-12, WEIGHT = 0.5g
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4623EV#PBF
LTM4623IV#PBF
LTM4623EY#PBF
LTM4623IY#PBF
LTM4623IY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4623V
LTM4623V
LTM4623Y
LTM4623Y
LTM4623Y
FINISH CODE
e4
e4
e1
e1
e0
PACKAGE
TYPE
LGA
LGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
TEMPERATURE RANGE
(Note 2)
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
• Consult Marketing for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures
•
LGA and BGA Package and Tray Drawings
Rev D
2
For more information
www.analog.com
LTM4623
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT(RANGE)
V
OUT(DC)
V
RUN
I
Q(SVIN)
I
S(VIN)
I
OUT(DC)
∆V
OUT
(Line)/V
OUT
V
OUT(AC)
∆V
OUT(START)
t
START
∆V
OUTLS
t
SETTLE
I
OUTPK
V
FB
I
FB
R
FBHI
I
TRACK/SS
V
IN(UVLO)
t
ON(MIN)
t
OFF(MIN)
V
PGOOD
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage, Total
Variation with Line and Load
RUN Pin On Threshold
Input Supply Bias Current
C
IN
= 22µF, C
OUT
= 100µF Ceramic, R
FB
= 40.2k,
MODE = INTV
CC
, I
OUT
= 0A to 3A (Note 3)
–40°C to 125°C
V
RUN
Rising
V
IN
= 12V, V
OUT
= 1.5V, MODE = INTV
CC
V
IN
= 12V, V
OUT
= 1.5V, MODE = GND
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 3A
V
IN
= 12V, V
OUT
= 1.5V
V
OUT
= 1.5V, V
IN
= 4V to 20V, I
OUT
= 0A
V
OUT
= 1.5V, I
OUT
= 0A to 3A
I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
I
OUT
= 0A, C
OUT
= 100µF Ceramic, TRACK/SS = 0.01µF,
V
IN
= 12V, V
OUT
= 1.5V
C
OUT
= 100µF Ceramic, No Load, TRACK/SS = 0.01µF,
V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 12V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V, –40°C to 125°C
(Note 4)
60.05
TRACK/SS = 0V
V
IN
Falling, SV
IN
= V
IN
V
IN
Hysteresis, SV
IN
= V
IN
(Note 4)
(Note 4)
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
–15
7
2.4
60.40
2
2.6
350
40
70
–10
10
–7
15
l
l
l
The
l
denotes the specifications which apply over the full internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= SV
IN
= 12V per the typical application shown on
the front page.
CONDITIONS
SV
IN
= V
IN
l
l
MIN
4
0.6
TYP
MAX
20
5.5
UNITS
V
V
l
1.477
1.1
1.50
1.2
6
2
11
0.5
1.523
1.3
V
V
mA
mA
µA
A
Input Supply Current
Output Continuous Current
Range
Line Regulation Accuracy
Output Ripple Voltage
Turn-On Overshoot
Turn-On Time
Peak Deviation for Dynamic
Load
Settling Time for Dynamic
Load Step
Output Current Limit
Voltage at FB Pin
Current at FB Pin
Resistor Between V
OUT
and
FB Pins
Track Pin Soft-Start Pull-Up
Current
V
IN
Undervoltage Lockout
Minimum On-Time
Minimum Off-Time
PGOOD Trip Level
0
0.04
0.5
5
30
2.5
80
40
3.5
0.592
5
0.60
3
0.15
1.5
A
%/V
%
mV
mV
ms
mV
µs
A
∆V
OUT
(Load)/V
OUT
Load Regulation Accuracy
0.606
±30
60.75
4
2.8
k
V
nA
µA
V
mV
ns
ns
%
%
Rev D
For more information
www.analog.com
3
LTM4623
ELECTRICAL CHARACTERISTICS
SYMBOL
I
PGOOD
V
PGL
V
INTVCC
V
INTVCC
Load Reg
f
OSC
PARAMETER
PGOOD Leakage
PGOOD Voltage Low
Internal V
CC
Voltage
INTV
CC
Load Regulation
Oscillator Frequency
I
PGOOD
= 1mA
SV
IN
= 4V to 20V
I
CC
= 0mA to 20mA
FREQ = OPEN
3.1
0.02
3.3
0.5
1
The
l
denotes the specifications which apply over the full internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= SV
IN
= 12V per the typical application shown on
the front page.
CONDITIONS
MIN
TYP
MAX
2
0.1
3.4
UNITS
µA
V
V
%
MHz
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 LTM4623 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4623E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4623I 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:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 4:
100% tested at wafer level.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Rev D
4
For more information
www.analog.com
LTM4623
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
with 5V
IN
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
0
V
OUT
= 3.3V, 2MHz
V
OUT
= 2.5V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 1.0V
1
2
LOAD CURRENT (A)
3
4623 G01
Efficiency vs Load Current
with 12V
IN
95
90
85
EFFICIENCY (%)
80
75
70
65
60
0
1
V
OUT
= 5V, 2MHz
V
OUT
= 3.3V, 2MHz
V
OUT
= 2.5V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 1.0V
2
LOAD CURRENT (A)
3
4623 G02
95
90
85
EFFICIENCY (%)
80
75
70
65
60
Efficiency vs Load Current
with 16V
IN
V
OUT
= 5V, 2MHz
V
OUT
= 3.3V, 2MHz
V
OUT
= 2.5V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 1.0V
0
1
2
LOAD CURRENT (A)
3
4623 G03
DCM Mode Efficiency with 12V
IN,
1.5V
OUT
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
0.1
LOAD CURRENT (A)
1
DCM
1.0V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
V
OUT
50mV/DIV
AC-COUPLED
1.2V Output Transient Response
CCM
LOAD STEP
1A/DIV
4623 G05
V
IN
= 12V
20µs/DIV
V
OUT
= 1.0V
FREQ = 1MHz
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
LOAD STEP
1A/DIV
4623 G06
V
IN
= 12V
20µs/DIV
V
OUT
= 1.2V
FREQ = 1MHz
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
4623 G03
1.5V Output Transient Response
1.8V Output Transient Response
2.5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4623 G07
V
IN
= 12V
20µs/DIV
V
OUT
= 1.5V
FREQ = 1MHz
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
V
OUT
50mV/DIV
AC-COUPLED
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4623 G08
V
IN
= 12V
20µs/DIV
V
OUT
= 1.8V
FREQ = 1MHz
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
4623 G09
V
IN
= 12V
20µs/DIV
V
OUT
= 2.5V
FREQ = 1MHz
OUTPUT CAPACITOR = 1
×
47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
LOAD STEP
1A/DIV
Rev D
For more information
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5
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