are the switching controllers, power FETs, inductors and
all support components. The dual 4A DC/DC converters
operate over an input voltage range of 2.375V to 5.5V.
The LTM4614 supports output voltages ranging from
0.8V to 5V. The regulator output voltages are set by a
single resistor for each output. Only bulk input and output
capacitors are needed to complete the design.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation.
Additional features include overvoltage protection, foldback
overcurrent protection, thermal shutdown and programmable
soft-start. The power module is offered in a space saving and
thermally enhanced 15mm
×
15mm
×
2.82mm LGA pack-
age. The LTM4614 is RoHS compliant with Pb-free finish.
Different Combinations of Input and Output Voltages
NUMBER OF INPUTS
2
2 (Current Share,
Ex. 3.3V and 5V)
1
1
NUMBER OF OUTPUTS
2
1
2
1
I
OUT(MAX)
4A, 4A
8A
4A, 4A
8A, see LTM4608A
Dual 4A Output Power Supply
Input Voltage Range: 2.375V to 5.5V
4A DC Typical, 5A Peak Output Current Each
0.8V Up to 5V Output Each, Parallelable
±2%
Max Total DC Output Error (0°C ≤ T
J
≤ 125°C)
Output Voltage Tracking
Up to 95% Efficiency
Programmable Soft-Start
Short-Circuit and Overtemperature Protection
Power Good Indicators
Small and Very Low Profile Package:
15mm
×
15mm
×
2.82mm
applicaTions
n
n
n
Telecom and Networking Equipment
FPGA Power
SERDES and Other Low Noise Applications
L,
LT, LTC, LTM, µModule, 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. Protected by U.S. Patents including 5481178, 6580258,
6304066, 6127815, 6498466, 6611131, 6724174.
Typical applicaTion
Dual Output 4A DC/DC µModule Regulator
V
IN1
3.3V TO 5V
10µF
LTM4614
V
IN2
3.3V TO 5V
10µF
GND1
V
IN2
V
OUT2
FB2
5.76k
GND2
4614 F01a
Efficiency vs Output Current
91
89
V
IN
= 3.3V
V
IN1
V
OUT1
FB1
10k
100µF
EFFICIENCY (%)
V
OUT1
1.2V/4A
87
85
83
81
79
77
75
0
1
2
V
OUT
1.2V
V
OUT
1.5V
V
OUT2
1.5V/4A
100µF
3
4
4614 TA01b
LOAD CURRENT (A)
4614fb
1
LTM4614
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
RUN/SS1
M
L
K
J
H
G
F
E
D
C
(See Pin Functions, Pin Configuration Table)
TOP VIEW
PGOOD1
TRACK1 COMP1
FB1
V
IN1
, V
IN2
, PGOOD1, PGOOD2...................... –0.3V to 6V
COMP1, COMP2, RUN/SS1, RUN/SS2
FB1, FB2,TRACK1, TRACK2 ......................... –0.3V to V
IN
SW1, SW2, V
OUT1
, V
OUT2
.............. –0.3V to (V
IN
+ 0.3V)
Internal Operating Temperature Range
(Notes 2, 3) ............................................ –40°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Body Temperature, Solder Reflow ......................... 245°C
V
OUT1
V
IN1
SW1
GND1
V
OUT2
V
IN2
SW2
B
A
1
2
3
4
5
6
GND2
7
8
9
10
11
12
RUN/SS2
PGOOD2
TRACK2 COMP2
FB2
LGA PACKAGE
144-LEAD (15mm
×
15mm
×
2.82mm)
T
JMAX
= 125°C,
θ
JCbottom
= 2-3°C/W,
θ
JA
= 15°C/W,
θ
JCtop
= 25°C/W,
θ
Values Determined
Using a 4-Layer 95mm
×
76mm PCB, Weight = 1.7g
orDer inForMaTion
LEAD FREE FINISH
LTM4614EV#PBF
LTM4614IV#PBF
TRAY
LTM4614EV#PBF
LTM4614IV#PBF
PART MARKING*
LTM4614V
LTM4614V
PACKAGE DESCRIPTION
144-Lead (15mm
×
15mm
×
2.82mm) LGA
144-Lead (15mm
×
15mm
×
2.82mm) LGA
TEMPERATURE RANGE (Note 2)
–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 full internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted. Refer to Figure 1.
Specified as each channel (Note 5).
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
C
IN
= 22µF, C
OUT
= 100µF, R
FB
= 5.76k
V
IN
= 2.375V to 5.5V, I
OUT
= 0A to 4A (Note 4)
0°C ≤ T
J
≤ 125°C
l
elecTrical characTerisTics
CONDITIONS
l
MIN
2.375
TYP
MAX
5.5
UNITS
V
1.460
1.45
1.6
1.49
1.49
2
0.35
20
35
7
1.508
1.512
2.3
V
V
V
A
mA
mA
µA
4614fb
V
IN(UVLO)
I
INRUSH(VIN)
I
Q(VIN)
Undervoltage Lockout Threshold
Input Inrush Current at Start-Up
Input Supply Bias Current
I
OUT
= 0A
I
OUT
= 0A, C
IN
= 22µF, C
OUT
= 100µF, V
OUT
= 1.5V
V
IN
= 5.5V
V
IN
= 2.375V, V
OUT
= 1.5V, Switching Continuous
V
IN
= 5.5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 5V
12
2
LTM4614
elecTrical characTerisTics
SYMBOL
I
S(VIN)
I
OUT(DC)
∆V
OUT(LINE)
V
OUT
∆V
OUT(LOAD)
V
OUT
V
OUT(AC)
f
s
Output Ripple Voltage
Output Ripple Voltage Frequency
Load Regulation Accuracy
V
OUT
= 1.5V, 0A to 4A (Note 4), V
IN
= 2.375V to 5.5V
0°C ≤ T
J
≤ 125°C
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
= 5V unless otherwise noted. Refer to Figure 1.
Specified as each channel (Note 5).
PARAMETER
Input Supply Current
Output Continuous Current Range
Line Regulation Accuracy
CONDITIONS
V
IN
= 2.375V, V
OUT
= 1.5V, I
OUT
= 4A
V
IN
= 5.5V, V
OUT
= 1.5V, I
OUT
= 4A
V
IN
= 3.3V, V
OUT
= 1.5V (Note 4)
V
OUT
= 1.5V, V
IN
from 2.375V to 5.5V, I
OUT
= 0A
l
MIN
TYP
3.15
1.35
MAX
UNITS
A
A
0
0.1
4
0.3
A
%
0.7
1.2
12
1.25
1.25
1.5
%
%
mV
P-P
MHz
I
OUT
= 0A, C
OUT
= 100µF (X5R)
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 4A, V
IN
= 5V, V
OUT
= 1.5V
C
OUT
= 100µF, V
OUT
= 1.5V, RUN/SS = 10nF,
I
OUT
= 0A
V
IN
= 3.3V
V
IN
= 5V
C
OUT
= 100µF, V
OUT
= 1.5V, I
OUT
= 1A Resistive Load,
TRACK = V
IN
and RUN/SS = Float
V
IN
= 5V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF, V
IN
= 5V, V
OUT
= 1.5V
Load: 0% to 50% to 0% of Full Load,
V
IN
= 5V, V
OUT
= 1.5V
C
OUT
= 100µF
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V
l
∆V
OUT(START)
Turn-On Overshoot
20
20
mV
mV
t
START
∆V
OUT(LS)
t
SETTLE
I
OUT(PK)
V
FB
I
FB
V
RUN
I
TRACK
Turn-On Time
0.5
25
10
ms
mV
µs
Peak Deviation for Dynamic Load
Settling Time for Dynamic Load
Step
Output Current Limit
Voltage at FB Pin
8
0.792
0.788
0.6
0.8
0.8
0.2
0.75
0.2
30
0
4.96
4.99
±7.5
90
0.8
5.025
150
0.808
0.810
0.9
A
V
V
µA
V
µA
mV
V
kΩ
%
Ω
RUN Pin On/Off Threshold
TRACK Pin Current
TRACK = 0.4V
V
TRACK(OFFSET)
Offset Voltage
V
TRACK(RANGE)
Tracking Input Range
R
FBHI
∆V
PGOOD
R
PGOOD
Resistor Between V
OUT
and FB Pins
PGOOD Range
PGOOD Resistance
Open-Drain Pull-Down
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 LTM4614 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4614E 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 LTM4614I 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:
The IC has overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperatures
will exceed 125°C when overtemperature is activated. Continuous
overtemperature activation can impair long-term reliability.
Note 4:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 5:
Two channels are tested separately and the specified test
conditions are applied to each channel.
4614fb
3
LTM4614
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
4614 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
4614 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
4614 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)
4614 G04
Load Transient Response
Load Transient Response
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.8V
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
= 100µF, 6.3V CERAMICS
4614 G05
20µs/DIV
V
IN
= 5V
V
OUT
= 1.5V
C
OUT
= 100µF, 6.3V CERAMICS
4614 G06
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
= 100µF, 6.3V CERAMICS
4614 G07
20µs/DIV
V
IN
= 5V
V
OUT
= 2.5V
C
OUT
= 100µF, 6.3V CERAMICS
4614 G08
20µs/DIV
V
IN
= 5V
V
OUT
= 3.3V
C
OUT
= 100µF, 6.3V CERAMICS
4614 G09
4614fb
4
LTM4614
Typical perForMance characTerisTics
Start-Up
V
OUT
1V/DIV
V
OUT
1V/DIV
V
FB
(mV)
V
IN
= 5V
200µs/DIV
V
OUT
= 2.5V
C
OUT
= 100µF
4A LOAD
(0.01µF SOFT-START CAPACITOR)
4614 G11
Start-Up
806
804
802
V
FB
vs Temperature
I
IN
1A/DIV
I
IN
1A/DIV
800
798
V
IN
= 5V
200µs/DIV
V
OUT
= 2.5V
C
OUT
= 100µF
NO LOAD
(0.01µF SOFT-START CAPACITOR)
4614 G10
796
794
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
4614 G12
Current Limit Foldback
1.6
1.4
1.2
1.0
V
OUT
(V)
0.8
0.6
0.4
V
OUT
= 1.5V
V
IN
= 5V
0.2
V
IN
= 3.3V
V
IN
= 2.5V
0
4
5
3
I
IN
1A/DIV
V
OUT
0.5V/DIV
Short-Circuit Protection
1.5V Short, No Load
V
OUT
0.5V/DIV
I
IN
1A/DIV
Short-Circuit Protection
1.5V Short, 4A Load
20µs/DIV
4614 G14
100µs/DIV
4614 G15
7
6
OUTPUT CURRENT (A)
8
4614 G13
pin FuncTions
V
IN1
, V
IN2
(J1-J6, K1-K6); (C1-C6, D1-D6):
Power Input
Pins. Apply input voltage between these pins and GND
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
