LTM4622 Datasheet PDF - Linear Technology


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LTM4622
Linear Technology

Part Number LTM4622
Description Dual Ultrathin 2.5A Step-Down DC/DC uModule Regulator
Page 26 Pages

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LTM4622
Dual Ultrathin 2.5A
Step-Down DC/DC µModule Regulator
FEATURES
nn Complete Solution in <1cm2
nn Wide Input Voltage Range: 3.6V to 20V
nn 3.3V Input Compatible with VIN Tied to INTVCC
nn 0.6V to 5.5V Output Voltage
nn Dual 2.5A DC, 3A Peak Output Current
nn ±1.5% Maximum Total Output Voltage Regulation
Error Over Load, Line and Temperature
nn Current Mode Control, Fast Transient Response
nn External Frequency Synchronization
nn Multiphase Parallelable with Current Sharing
nn Output Voltage Tracking and Soft-Start Capability
nn Selectable Burst Mode® Operation
nn Overvoltage Input and Overtemperature Protection
nn Power Good Indicators
nn 6.25mm × 6.25mm × 1.82mm LGA Package
APPLICATIONS
nn General Purpose Point of Load Conversion
nn Telecom, Networking and Industrial Equipment
nn Medical Diagnostic Equipment
nn Test and Debug Systems
DESCRIPTION
The LTM®4622 is a complete dual 2.5A step-down switch-
ing mode µModule® (micromodule) regulator in a tiny
ultrathin 6.25mm × 6.25mm × 1.82mm LGA package.
Included in the package are the switching controller, power
FETs, inductor and support components. Operating over
an input voltage range of 3.6V to 20V, the LTM4622 sup-
ports an output voltage range of 0.6V to 5.5V, set by a
single external resistor. Its high efficiency design delivers
dual 2.5A continuous, 3A peak, output current. Only a few
ceramic input and output capacitors are needed.
The LTM4622 supports selectable Burst Mode operation
and output voltage tracking for supply rail sequencing. 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 input overvoltage, output
overcurrent and overtemperature protection.
The LTM4622 is RoHS compliant with Pb-free finish.
L, LT, LTC, LTM, µModule, Burst Mode, PolyPhase, Linear Technology and the Linear logo are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.5V and 1V Dual Output DC/DC Step-Down µModule Regulator
VIN
3.6V TO 20V
4.7µF
25V
PGOOD1 PGOOD2
VIN VOUT1
RUN1
RUN2 LTM4622 VOUT2
INTVCC
COMP1
SYNC/MODE
COMP2
TRACK/SS1
FB1
TRACK/SS2
FB2
FREQ
GND
VOUT1
47µF 1V, 2.5A
47µF
VOUT2
1.5V, 2.5A
40.2k 90.9k
4622 TA01a
1.5V Output Efficiency vs Load Current
95
90
85
80
75
70
65 VIN = 5V
60 VIN = 12V
0 0.5 1.0 1.5 2.0 2.5 3
LOAD CURRENT (A)
4622 TA01b
For more information www.linear.com/LTM4622
4622f
1



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LTM4622
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN.............................................................. –0.3V to 22V
VOUT.............................................................. –0.3V to 6V
PGOOD1, PGOOD2...................................... –0.3V to 18V
RUN1, RUN2..................................... –0.3V to VIN + 0.3V
INTVCC, TRACK/SS1, TRACK/SS2............. –0.3V to 3.6V
SYNC/MODE, COMP1, COMP2,
FB1, FB2................................................ –0.3V to INTVCC
Operating Internal Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range................... –55°C to 125°C
Peak Solder Reflow Body Temperature.................. 245°C
PIN CONFIGURATION
(See Pin Functions, Pin Configuration Table)
TOP VIEW
SYNC/
COMP2 GND MODE GND COMP1
PGOOD2 5
FB2
INTVCC
4
TRACK/SS2
VIN
3
RUN2 2
VIN
VOUT2 1
FREQ
PGOOD1
FB1
VIN
TRACK/SS1
RUN1
GVINND
VOUT1
ABCDE
LGA PACKAGE
25-LEAD (6.25mm × 6.25mm × 1.82mm)
TJMAX = 125°C, θJCtop = 17°C/W, θJCbottom = 11°C/W,
θJB + θBA = 22°C/W, θJA = 22°C/W,
WEIGHT = 0.21g
ORDER INFORMATION
PART NUMBER
LTM4622EV#PBF
LTM4622IV#PBF
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
PART MARKING*
DEVICE
FINISH CODE
LTM4622V
e4
LTM4622V
e4
PACKAGE
TYPE
LGA
LGA
MSL
RATING
3
3
TEMPERATURE RANGE
(Note 2)
–40°C to 125°C
–40°C to 125°C
Consult Marketing for parts specified with wider operating temperature
ranges. *Device temperature grade is indicated by a label on the shipping
container. Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Pb-free and Non-Pb-free Part Markings:
www.linear.com/leadfree
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures:
www.linear.com/umodule/pcbassembly
• LGA and BGA Package and Tray Drawings:
www.linear.com/packaging
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating temperature
the typical application
range (Note 2). Specified
shown in Figure 24.
as
each
individual
output
channel
at
TA
=
25°C,
VIN
=
12V,
unless
otherwise
noted
per
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Switching Regulator Section: per Channel
VIN
VIN_3.3
VOUT(RANGE)
VOUT(DC)
VRUN
Input DC Voltage
3.3V Input DC Voltage
Output Voltage Range
Output Voltage, Total Variation
with Line and Load
RUN Pin On Threshold
l 3.6
20
VIN = INTVCC = 3.3V
l 3.1 3.3 3.5
VIN = 3.6V to 20V
l 0.6
5.5
CIN = 22µF, COUT = 100µF Ceramic, RFB = 40.2k,
l 1.477 1.50 1.523
MODE = INTVCC,VIN = 3.6V to 20V, IOUT = 0A to 2.5A
RUN Threshold Rising
RUN Threshold Falling
1.20 1.27 1.35
0.97 1.00 1.03
V
V
V
V
V
V
IQ(VIN)
Input Supply Bias Current
VIN = 12V, VOUT = 1.5V, MODE = GND
VSIhNu=td1o2wVn,,
VROUUNT 1=
1.5V, MODE
= RUN2 = 0
=
INTVCC
11 mA
500 µA
45 µA
IS(VIN)
IOUT(DC)
ΔVOUT (Line)/VOUT
Input Supply Current
Output Continuous Current Range
Line Regulation Accuracy
VIN = 12V, VOUT = 1.5V, IOUT = 2.5A
VIN = 12V, VOUT = 1.5V (Note 3)
VOUT = 1.5V, VIN = 3.6V to 20V, IOUT = 0A
l0
l
0.35
2.5
0.01 0.1
A
A
%/V
4622f
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LTM4622
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating temperature
the typical application
range (Note 2).
shown in Figure
Specified
24.
as
each
individual
output
channel
at
TA
=
25°C,
VIN
=
12V,
unless
otherwise
noted
per
SYMBOL
PARAMETER
ΔVOUT (Load)/VOUT Load Regulation Accuracy
VOUT(AC)
Output Ripple Voltage
ΔVOUT(START)
Turn-On Overshoot
tSTART
Turn-On Time
ΔVOUTLS
Peak Deviation for Dynamic Load
tSETTLE
IOUTPK
VFB
IFB
RFBHI
ITRACK/SS
tSS
tON(MIN)
tOFF(MIN)
VPGOOD
Settling Time for Dynamic Load
Step
Output Current Limit
Voltage at FB Pin
Current at FB Pin
Resistor Between VOUT and FB
Pins
Track Pin Soft-Start Pull-Up
Current
Internal Soft-Start Time
Minimum On-Time
Minimum Off-Time
PGOOD Trip Level
RPGOOD
VINTVCC
VINTVCC Load Reg
fOSC
fSYNC
IMODE
PGOOD Pull-Down Resistance
Internal VCC Voltage
INTVCC Load Regulation
Oscillator Frequency
SYNC Capture Range
MODE Input Current
CONDITIONS
VOUT = 1.5V, IOUT = 0A to 2.5A
IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,
VOUT = 1.5V
IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,
VOUT = 1.5V
COUT = 100µF Ceramic, No Load, TRACK/SS = 0.01µF,
VIN = 12V, VOUT = 1.5V
Load: 0% to
Ceramic, VIN
50% to
= 12V,
0% of Full Load,
VOUT = 1.5V
COUT
=
100µF
Load: 0% to
Ceramic, VIN
50% to
= 12V,
0% of Full Load,
VOUT = 1.5V
COUT
=
100µF
VIN = 12V, VOUT = 1.5V
IOUT = 0A, VOUT = 1.5V
(Note 4)
l
l
TRACK/SS = 0V
10% to 90% Rise Time (Note 4)
(Note 4)
(Note 4)
VFVBFWB RithamRpeisnpgecNtetgoaStiveet Output
VFB Ramping Positive
1mA Load
VIN = 3.6V to 20V
ICC = 0mA to 50mA, VIN = 3.6V to 20V
With Respect to Set Frequency
MODE = INTVCC
MIN
3
0.592
60.00
3.1
TYP
0.2
5
30
2.5
100
20
4
0.60
60.40
1.4
400
20
45
–8
8
20
3.3
1.3
1
±30
–1.5
MAX
1.0
0.608
±30
60.80
700
–14
14
3.5
UNITS
%
mV
mV
ms
mV
µs
A
V
nA
µA
μs
ns
ns
%
%
Ω
V
%
MHz
%
µA
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 LTM4622 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4622E 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 LTM4622I 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 VIN, VOUT and TA.
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.
For more information www.linear.com/LTM4622
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LTM4622
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
at 5VIN
95
Efficiency vs Load Current
at 12VIN
95
Efficiency vs Load Current
at 3.3VIN
95
90 90
90
85 85
85
80 80
80
75 75
75
70
OUTPUT:
65
3.3V, 2MHz
1.8V, 1MHz
1.2V, 1MHz
60
0 0.5 1.0 1.5
2.5V, 1.5MHz
1.5V, 1MHz
1.0V, 1MHz
2.0 2.5 3
LOAD CURRENT (A)
4622 G01
Burst Mode Efficiency,
12VIN, 1.5VOUT
100
90 Burst Mode Operation
80
70
60
50 CCM
40
30
20
10
0
0.01
0.1
LOAD CURRENT (A)
1
4622 G03
1.5V Output Transient Response
70 OUTPUT:
5.0V, 2.5MHz
3.3V, 2MHz
65
2.5V, 1.5MHz
1.5V, 1MHz
1.8V, 1MHz
1.2V, 1MHz
60 1.0V, 1MHz
0 0.5 1.0 1.5 2.0 2.5 3
LOAD CURRENT (A)
4622 G02
1V Output Transient Response
70
OUTPUT:
65
2.5V, 1.5MHz
1.5V, 1MHz
60 1.0V, 1MHz
0 0.5 1.0 1.5
1.8V, 1MHz
1.2V, 1MHz
2.0 2.5 3
LOAD CURRENT (A)
4622 G02b
1.2V Output Transient Response
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
LOAD STEP
1A/DIV
VIN = 12V
20μs/DIV
4622 G04
VOUT = 1V
FS = 1MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
VIN = 12V
20µs/DIV
4622 G05
VOUT = 1.2V
FS = 1MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
1.8V Output Transient Response
2.5V Output Transient Response
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
VIN = 12V
20µs/DIV
4622 G06
VOUT = 1.5V
FS = 1MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
LOAD STEP
1A/DIV
LOAD STEP
1A/DIV
VIN = 12V
20µs/DIV
4622 G07
VOUT = 1.8V
FS = 1MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
VIN = 12V
20µs/DIV
4622 G08
VOUT = 2.5V
FS = 1.5MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
4622f
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