LTM4625
20V
IN
, 5A Step-Down DC/DC
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4625
is a complete 5A step-down switching
mode µModule (micromodule) regulator in a tiny 6.25mm
× 6.25mm × 5.01mm BGA package. Included in the pack-
age 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 LTM4625 supports an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers up to 5A continuous output current. Only
bulk input and output capacitors are needed.
The LTM4625 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 LTM4625 is available with SnPb or RoHS compliant
terminal finish.
All registered trademarks and trademarks are the property of their respective owners.
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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
5A DC Output Current
±1.5% Maximum Total DC Output Voltage Error
Over Line, Load and Temperature
Current Mode Control, Fast Transient Response
External Frequency Synchronization
Multiphase Parallel Current Sharing with
Multiple LTM4625s
Output Voltage Tracking
Selectable Discontinuous Mode
Power Good Indicator
Overvoltage, Overcurrent and Overtemperature
Protection
6.25mm × 6.25mm × 5.01mm BGA Package
APPLICATIONS
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Telecom, Datacom, Networking and
Industrial Equipment
Medical Diagnostic Equipment
Data Storage Rack Units and Cards
Test and Debug Systems
TYPICAL APPLICATION
5A, 1.5V Output DC/DC µModule
®
Step-Down Regulator
V
IN
4V TO 20V
CLKIN PHMODE CLKOUT
V
IN
V
OUT
SV
IN
RUN
LTM4625
PGOOD
INTV
CC
MODE
COMP
FB
TRACK/SS
FREQ
GND
SGND
4625 TA01a
1.5V Output Efficiency vs Load Current
95
90
V
OUT
1.5V
47µF 5A
85
EFFICIENCY (%)
80
75
70
40.2k
65
60
0
1
3
LOAD CURRENT (A)
2
V
IN
= 5V
V
IN
= 12V
4
5
4625 TA01b
10µF
0.1µF
Rev D
Document Feedback
For more information
www.analog.com
1
LTM4625
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
RUN ........................................................... –0.3V to 22V
PGOOD, MODE, TRACK/SS, FREQ, PHMODE,
CLKIN.................................................... –0.3V to INTV
CC
Internal Operating Temperature Range
(Notes 2, 5) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Peak Solder Reflow Body Temperature ................. 245°C
V
IN
MODE
INTV
CC
GND
PGOOD
V
OUT
A
B
C
D
E
3
PHMODE
TRACK/SS 2
FB
COMP
1
BGA PACKAGE
25-LEAD (6.25mm 6.25mm 5.01mm)
T
JMAX
= 125°C, J
Ctop
= 17°C/W,
JCbottom
= 11°C/W,
JB
+
BA
= 22°C/W,
JA
= 22°C/W,
JA
DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERS
VALUES DETERMINED PER JESD51-12, WEIGHT = 0.5g
ORDER INFORMATION
PART NUMBER
LTM4625EY#PBF
LTM4625IY#PBF
LTM4625IY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
PART MARKING*
DEVICE
LTM4625Y
LTM4625Y
LTM4625Y
FINISH CODE
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
MSL
RATING
3
3
3
TEMPERATURE RANGE
(Note 2)
–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
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT
V
OUT(DC)
V
RUN
I
Q(SVIN)
I
S(VIN)
PARAMETER
Input DC Voltage
Output Voltage Range
Output Voltage, Total
Variation with Line and Load
RUN Pin On Threshold
Input Supply Bias Current
Switching Regulator Section: per Channel
SV
IN
= V
IN
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
= SV
IN
= 12V per the typical application shown on
the front page.
CONDITIONS
l
l
MIN
4
0.6
TYP
MAX
20
5.5
UNITS
V
V
C
IN
= 22µF, C
OUT
= 100µF Ceramic, R
FB
= 40.2k,
MODE = INTV
CC
, I
OUT
= 0A to 5A (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
= 5A
l
1.477
1.1
1.50
1.2
6
2
11
0.75
1.523
1.3
V
V
mA
mA
µA
A
Input Supply Current
Rev D
2
For more information
www.analog.com
LTM4625
ELECTRICAL CHARACTERISTICS
SYMBOL
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
I
PGOOD
V
PGL
V
INTVCC
f
OSC
PARAMETER
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
TRACK/SS = 0V
V
IN
Falling
V
IN
Hysteresis
(Note 4)
(Note 4)
V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
I
PGOOD
= 1mA
SV
IN
= 4V to 20V
3.1
–15
7
2.4
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
= SV
IN
= 12V per the typical application shown on
the front page.
CONDITIONS
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 5A
I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
I
OUT
= 0A, C
OUT
= 100µF Ceramic, 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
60.40
2.0
2.6
350
40
70
–10
10
0.02
3.2
1
–7
15
2
0.1
3.3
l
l
l
MIN
0
TYP
MAX
5
UNITS
A
%/V
%
mV
mV
ms
mV
µs
A
0.04
0.5
5
30
2.5
160
40
6
0.593
7
0.60
0.15
1.5
∆V
OUT
(Load)/V
OUT
Load Regulation Accuracy
0.607
±30
60.75
4
2.8
k
V
nA
µA
V
mV
ns
ns
%
%
µA
V
V
MHz
PGOOD Leakage
PGOOD Voltage Low
Internal V
CC
Voltage
Oscillator Frequency
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 LTM4625 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4625E 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 LTM4625I 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
For more information
www.analog.com
3
LTM4625
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
0
1
3.3V
OUT
1.8V
OUT
1.2V
OUT
3
LOAD CURRENT (A)
2
2.5V
OUT
1.5V
OUT
1V
OUT
4
5
4625 G01
Efficiency vs Load Current
from 5V
IN
95
90
85
Efficiency vs Load Current
from 12V
IN
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
5
4625 G02
DCM Mode Efficiency, V
OUT
= 1.5V
V
IN
= 5V
V
IN
= 12V
80
75
70
65
60
0
1
5V
OUT
2.5V
OUT
1.5V
OUT
1V
OUT
3
LOAD CURRENT (A)
2
3.3V
OUT
1.8V
OUT
1.2V
OUT
4
0
0.001
0.01
0.1
1
LOAD CURRENT (A)
10
4625 G03
1V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
V
IN
= 12V
20µs/DIV
V
OUT
= 1V
I
OUT
= 4A TO 5A, 1A/µs
OUTPUT CAPACITOR = 47µF CERAMIC
4625 G04
1.5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
V
IN
= 12V
20µs/DIV
V
OUT
= 1.5V
I
OUT
= 4A TO 5A, 1A/µs
OUTPUT CAPACITOR = 47µF CERAMIC
4625 G05
2.5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
20µs/DIV
V
IN
= 12V
V
OUT
= 2.5V
I
OUT
= 4A TO 5A, 1A/µs
OUTPUT CAPACITOR = 47µF CERAMIC
4625 G06
3.3V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
20µs/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 4A TO 5A, 1A/µs
OUTPUT CAPACITOR = 47µF CERAMIC
4625 G07
5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
20µs/DIV
V
IN
= 12V
V
OUT
= 5V
I
OUT
= 4A TO 5A, 1A/µs
OUTPUT CAPACITOR = 47µF CERAMIC
4625 G08
Rev D
4
For more information
www.analog.com
LTM4625
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up with No Load Current
Start-Up with 5A Load Current
Short-Circuit with No Load
Applied
V
OUT
0.5V/DIV
I
IN
2A/DIV
5ms/DIV
4625 G09
V
OUT
0.5V/DIV
I
IN
2A/DIV
5ms/DIV
4625 G10
V
OUT
0.5V/DIV
I
IN
500mA/DIV
20µs/DIV
4625 G11
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Short-Circuit with 5A Load
Applied
Recovery from Short-Circuit with
No Load Applied
V
OUT
0.5V/DIV
I
IN
500mA/DIV
50µs/DIV
4625 G12
V
OUT
0.5V/DIV
I
IN
1A/DIV
20µs/DIV
4625 G13
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Steady-State Output Voltage
Ripple
Start Into Pre-Biased Output
V
OUT
5mV/DIV
AC-COUPLED
V
IN
5V/DIV
V
OUT
0.5V/DIV
V
IN
= 12V
V
OUT
= 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
20MHz BW
1µs/DIV
4625 G14
V
IN
= 12V
V
OUT
= 1.5V WITH 0.75V PREBIASED VOLTAGE
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
5ms/DIV
4625 G15
Rev D
For more information
www.analog.com
5
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