LTM4604A
Low Voltage, 4A DC/DC
µModule Regulator with Tracking
FeaTures
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
DescripTion
The
LTM
®
4604A
is a complete 4A switch mode step-down
µModule
®
(micromodule) regulator with ±1.75% maximum
total output voltage error. Included in the package are the
switching controller, power FETs, inductor and all support
components. Operating over an input voltage range of
2.375V to 5.5V, the LTM4604A supports an output volt-
age range of 0.8V to 5V, set by a single resistor. This high
efficiency design delivers up to 4A continuous current
(5A peak). Only input and output capacitors are needed
to complete the design.
The 0.630mm LGA pads with 1.27mm pitch simplify
PCB layout by providing standard trace routing and via
placement. (The LTM4604A has smaller pads than the
LTM4604). The low profile package enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. 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 foldback current protec-
tion, thermal shutdown and a programmable soft-start
function. The LTM4604A is offered with SnPb (BGA) or
RoHS-compliant terminal finish.
Complete Standalone Power Supply
±1.75%
Max Total DC Output Error (–40°C to 125°C)
Wide Input Voltage Range: 2.375V to 5.5V
4A DC, 5A Peak Output Current
0.8V to 5V Output
Output Voltage Tracking
UltraFast
TM
Transient Response
Power Good Indicator
Current Mode Control
Current Foldback Protection, Parallel/Current Sharing
Up to 95% Efficiency
Programmable Soft-Start
Micropower Shutdown: I
Q
≤ 7µA
Overtemperature Protection
9mm × 15mm × 2.32mm LGA and
9mm × 15mm × 3.42mm BGA Packages
applicaTions
n
n
n
n
n
Telecom and Networking Equipment
Servers
Storage Cards
ATCA Cards
Industrial Equipment
L,
LT, LTC, LTM, Linear Technology, LTspice, µModule and the Linear logo are registered
trademarks and UltraFast and LTpowerCAD are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical applicaTion
3.3V to 2.5V/4A µModule Regulator
V
IN
3.3V
10µF
6.3V
EFFICIENCY (%)
100
95
90
85
80
75
70
65
4604A TA01a
Efficiency vs Output Current
V
IN
= 3.3V
V
OUT
= 2.5V
V
IN
PGOOD
COMP
GND
V
OUT
FB
V
IN
2.37k
LTM4604A
RUN/SS TRACK
V
OUT
2.5V
4A
22µF
6.3V
×2
0
1
3
OUTPUT CURRENT (A)
2
4
4604A TA01b
4604afc
For more information
www.linear.com/LTM4604A
1
LTM4604A
absoluTe MaxiMuM raTings
(Note 1)
V
IN
, PGOOD ................................................. –0.3V to 6V
COMP, RUN/SS, FB, TRACK ........................ –0.3V to V
IN
SW, V
OUT
...................................... –0.3V to (V
IN
+ 0.3V)
Internal Operating 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
TOP VIEW
TRACK
A
1
2
3
4
5
6
7
8
9
10
11
GND
V
OUT
BGA PACKAGE
66-PIN (15mm
×
9mm
×
3.42mm)
T
JMAX
= 125°C,
θ
JA
= 25°C/W,
θ
JC(BOTTOM)
= 7°C/W,
θ
JC(TOP)
= 50°C/W, WEIGHT = 1.1g
SW
RUN/
SS
GND
B
V
IN
COMP
FB
1
2
3
4
5
6
7
8
9
10
11
GND
V
OUT
LGA PACKAGE
66-PIN (15mm
×
9mm
×
2.32mm) 0.630mm PAD
T
JMAX
= 125°C,
θ
JA
= 25°C/W,
θ
JC(BOTTOM)
= 7°C/W,
θ
JC(TOP)
= 50°C/W, WEIGHT = 1.0g
SW
RUN/
SS
GND
C
D
E
PGOOD
F
G
A
B
V
IN
COMP
FB
TOP VIEW
TRACK
C
D
E
PGOOD
F
G
orDer inForMaTion
PART NUMBER
LTM4604AEV#PBF
LTM4604AIV#PBF
LTM4604AEY#PBF
LTM4604AIY#PBF
LTM4604AIY
PAD OR BALL FINISH
Au (RoHS)
Au (RoHS)
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
PART MARKING*
DEVICE
LTM4604AV
LTM4604AV
LTM4604AY
LTM4604AY
LTM4604AY
FINISH CODE
e4
e4
e1
e1
e0
PACKAGE
TYPE
LGA
LGA
BGA
BGA
BGA
MSL
RATING
3
3
3
3
3
TEMPERATURE RANGE
(SEE 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. *Device temperature grade is indicated by a label on the shipping
container. Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Terminal Finish 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:
http://www.linear.com/packaging
2
4604afc
For more information
www.linear.com/LTM4604A
LTM4604A
elecTrical characTerisTics
SYMBOL
V
IN(DC)
V
OUT(DC)
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Undervoltage Lockout
Threshold
Peak Input Inrush Current at
Start-Up
I
OUT
= 0A
I
OUT
= 0A, C
IN
= 10µF, C
OUT
= 22µF × 3,
RUN/SS = 0.01µF, V
OUT
= 1.5V
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 3.3V, No Switching
V
IN
= 3.3V, V
OUT
= 1.5V, Switching Continuous
V
IN
= 5V, No Switching
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 5V
V
IN
= 2.5V, V
OUT
= 1.5V, I
OUT
= 4A
V
IN
= 3.3V, V
OUT
= 1.5V, I
OUT
= 4A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 4A
V
IN
= 3.3V, V
OUT
= 1.5V (Note 3)
V
OUT
= 1.5V, V
IN
from 2.375V to 5.5V, I
OUT
= 0A
V
OUT
= 1.5V, 0A to 4A (Note 3)
V
IN
= 3.3V
V
IN
= 5V
I
OUT
= 0A
V
IN
= 3.3V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 4A, V
IN
= 5V, V
OUT
= 1.5V
V
OUT
= 1.5V, RUN/SS = 10nF, C
OUT
= 22µF × 3,
I
OUT
= 0A
V
IN
= 3.3V
V
IN
= 5V
C
OUT
= 22µF × 3, V
OUT
= 1.5V, I
OUT
= 1A Resistive Load,
TRACK = V
IN
and RUN/SS = Float
V
IN
= 3.3V
V
IN
= 5V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 22µF ×3 Ceramic
V
IN
= 5V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load
V
IN
= 5V, V
OUT
= 1.5V
V
IN
= 3.3V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
l
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
= 5V unless otherwise noted. See Figure 15.
PARAMETER
Input DC Voltage
Output Voltage, Total Variation C
IN
= 10µF, C
OUT
= 22µF × 3, R
FB
= 5.69k
with Line and Load
V
IN
= 2.375V to 5.5V, I
OUT
= 0A to 4A (Note 3)
CONDITIONS
l
l
MIN
2.375
1.482
1.474
1.75
TYP
1.5
1.5
2
MAX
5.5
1.518
1.522
2.3
UNITS
V
V
V
V
0.7
0.7
60
28
100
35
7
2.9
2.2
1.45
4
0.1
0.2
A
A
µA
mA
µA
mA
µA
A
A
A
A
%
I
Q(VIN NOLOAD)
Input Supply Bias Current
I
S(VIN)
Input Supply Current
Output Specifications
I
OUT(DC)
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
f
S
ΔV
OUT(START)
Output Ripple Voltage
Load Regulation Accuracy
l
l
Output Continuous Current
Range
Line Regulation Accuracy
0.3
0.3
10
12
1.25
0.6
0.6
%
%
mV
P-P
mV
P-P
MHz
Output Ripple Voltage
Frequency
Turn-On Overshoot
20
20
mV
mV
t
START
Turn-on Time
1.5
1.0
ms
ms
ΔV
OUT(LS)
t
SETTLE
I
OUT(PK)
Peak Deviation for Dynamic
Load Step
Settling Time for Dynamic
Load Step
Output Current Limit
25
10
8
8
mV
µs
A
A
4604afc
For more information
www.linear.com/LTM4604A
3
LTM4604A
elecTrical characTerisTics
SYMBOL
Control Section
V
FB
I
FB
V
RUN/SS
I
TRACK
V
TRACK(OFFSET)
V
TRACK(RANGE)
R
FBHI
PGOOD
ΔV
PGOOD
R
PGOOD
PGOOD Range
PGOOD Resistance
Open-Drain Pull-Down
±7.5
90
150
%
Ω
RUN/SS Pin On/Off Threshold
TRACK Pin Current
Offset Voltage
Tracking Input Range
Resistor Between V
OUT
and
FB Pins
TRACK = 0.4V
0
4.965
4.99
0.5
Voltage at FB Pin
I
OUT
= 0A, V
OUT
= 1.5V
l
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
= 5V unless otherwise noted. See Figure 15.
PARAMETER
CONDITIONS
MIN
0.793
0.788
TYP
0.8
0.8
0.2
0.65
0.2
30
0.8
5.015
0.8
MAX
0.807
0.808
UNITS
V
V
µA
V
µA
mV
V
kΩ
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 LTM4604A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4604AE 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 LTM4604AI is guaranteed to meet specifications over the
full 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
.
4
4604afc
For more information
www.linear.com/LTM4604A
LTM4604A
Typical perForMance characTerisTics
Efficiency vs Output Current
V
IN
= 2.5V
100
95
90
EFFICIENCY (%)
EFFICIENCY (%)
85
80
75
70
65
0
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.8V
1
3
OUTPUT CURRENT (A)
2
4
4604A G01
Efficiency vs Output Current
V
IN
= 3.3V
100
95
90
85
80
75
70
65
0
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.8V
1
3
OUTPUT CURRENT (A)
2
4
4604A G02
Efficiency vs Output Current
V
IN
= 5V
95
90
EFFICIENCY (%)
85
80
75
70
65
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.8V
0
1
2
3
OUTPUT CURRENT (A)
4
4604A G03
Minimum Input Voltage
at 4A Load
3.5
3.0
2.5
V
OUT
(V)
2.0
1.5
1.0
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
IN
(V)
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.8V
Load Transient Response
Load Transient Response
I
LOAD
2A/DIV
V
OUT
20mV/DIV
I
LOAD
2A/DIV
V
OUT
20mV/DIV
20µs/DIV
V
IN
= 5V
V
OUT
= 1.2V
,
C
OUT
= 4
×
22µF 6.3V CERAMICS
I
OUT
= 0A TO 2A
4604A G05
20µs/DIV
V
IN
= 5V
V
OUT
= 1.5V
,
C
OUT
= 4
×
22µF 6.3V CERAMICS
I
OUT
= 0A TO 2A
4604A G06
4604A G04
Load Transient Response
Load Transient Response
Load Transient Response
I
LOAD
2A/DIV
V
OUT
20mV/DIV
I
LOAD
2A/DIV
I
LOAD
2A/DIV
V
OUT
20mV/DIV
V
OUT
20mV/DIV
20µs/DIV
V
IN
= 5V
V
OUT
= 1.8V
C
OUT
= 3
×
22µF, 6.3V CERAMICS
I
OUT
= 0A TO 2A
4604A G07
20µs/DIV
V
IN
= 5V
V
OUT
= 2.5V
C
OUT
= 3
×
22µF, 6.3V CERAMICS
I
OUT
= 0A TO 2A
4604A G08
20µs/DIV
V
IN
= 5V
V
OUT
= 3.3V
C
OUT
= 2
×
22µF, 6.3V CERAMICS
I
OUT
= 0A TO 2A
4604A G09
4604afc
For more information
www.linear.com/LTM4604A
5
京公网安备 11010802033920号
EEWORLD
