switch mode DC/DC power regulator system in a 15mm
×
15mm surface mount LGA package. Included in the package
are the switching controller, power FETs, inductor and all
support components. Operating from an input voltage
range of 2.7V to 5.5V, the LTM4616 supports two outputs
within a voltage range of 0.6V to 5V, each set by a single
external resistor. This high efficiency design delivers up
to 8A continuous current (10A peak) for each output. Only
bulk input and output capacitors are needed, depending
on ripple requirement. The part can also be configured for
a 2-phase single output at up to 16A.
The low profile package (2.82mm) enables utilization
of unused space on the back side of PC boards for high
density point-of-load regulation.
Fault protection features include overvoltage protection,
overcurrent protection and thermal shutdown. The power
module is offered in a space saving and thermally enhanced
15mm
×
15mm
×
2.82mm LGA package. The LTM4616 is
Pb-free and RoHS compliant.
Different Combinations of Input and Output
Number of Inputs
2
2
1
1
Number of Outputs
2
1
2
1
I
OUT
(MAX)
8A, 8A
16A
8A, 8A
16A
■
■
■
■
■
■
■
■
■
■
■
■
Complete Dual DC/DC Regulator System
Input Voltage Range: 2.7V to 5.5V
Dual 8A Outputs, or Single 16A Output with a 0.6V
to 5V Range
Output Voltage Tracking and Margining
±1.75% Total DC Output Error (–40°C to 125°C)
Current Mode Control/Fast Transient Response
Power-Good Tracking and Margining
Overcurrent/Thermal Shutdown Protection
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Multiphase Operation
Selectable Burst Mode
®
Operation
Output Overvoltage Protection
Gold-Pad Finish Allows Soldering with Pb and Pb-
Free Solder Paste
Small Surface Mount Footprint, Low Profile
(15mm
×
15mm
×
2.82mm) LGA Package
APPLICATIONS
■
■
■
Telecom, Networking and Industrial Equipment
Storage and ATCA, PCI Express Cards
Battery Operated Equipment
L,
LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
μModule 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 DC/DC μModule™ Regulator
V
IN1
5V
V
IN1
10μF
V
OUT1
FB1
LTM4616
ITHM1
V
IN2
3.3V TO 5V
V
IN2
V
OUT2
FB2
10μF
ITHM2
GND1
GND2
4616 TA01a
Efficiency vs Load Current
95
5V
IN
3.3V
OUT
V
OUT1
3.3V/8A
90
EFFICIENCY (%)
5V
IN
2.5V
OUT
85
2.21k
100μF
V
OUT2
2.5V/8A
3.09k
100μF
80
75
70
0
2
4
6
LOAD CURRENT (A)
8
4616 TA01b
4616fa
1
LTM4616
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
IN2
M
L
K
J
V
IN1
, SV
IN1
, V
IN2
, SV
IN2
................................ –0.3V to 6V
CLKOUT1, CLKOUT2 .................................... –0.3V to 2V
PGOOD1, PLLLPF1, CLKIN1, PHMODE1,
MODE1, PGOOD2, PLLLPF2, CLKIN2,
PHMODE2, MODE2................................. –0.3V to V
IN
I
TH1
, I
THM1
, RUN1, FB1, TRACK1, MGN1,
BSEL1, I
TH2
, I
THM2
, RUN2, FB2, TRACK2,
MGN2, BSEL2 ......................................... –0.3V to V
IN
V
OUT1
, V
OUT2
, SW1, SW2............................ –0.3V to V
IN
Internal Operating Temperature Range
(Note 2) .............................................–40°C to 125°C
Junction Temperature ........................................... 125°C
Storage Temperature Range...................–55°C to 125°C
SGND2 & CONTROL
V
OUT2
GND2
H
G
F
SW2,
I/O & CONTROL
SGND1 & CONTROL
V
IN1
E
D
C
B
A
1
2
3
4
5
6
7
8
9
10
11
12
V
OUT1
GND1
SW1, I/O & CONTROL
LGA PACKAGE
144-LEAD (15mm
×
15mm
×
2.8mm)
T
JMAX
= 125°C,
θ
JP
= 2°C/W,
θ
JC
= 16°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTM4616EV#PBF
LTM4616IV#PBF
TRAY
LTM4616EV#PBF
LTM4616IV#PBF
PART MARKING*
LTM4616V
LTM4616V
PACKAGE DESCRIPTION
144-Lead (15mm
×
15mm
×
2.82mm) LGA
144-Lead (15mm
×
15mm
×
2.82mm) LGA
INTERNAL TEMPERATURE RANGE
–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
●
denotes the specifications which apply over the –40°C to 125°C
internal operating temperature range. T
A
= 25°C, V
IN
= 5V unless otherwise noted. Per the typical application in Figure 18. Specified
as each channel (Note 3).
SYMBOL
V
IN1(DC),
V
IN2(DC)
PARAMETER
Input DC Voltage
C
IN
= 10μF × 1, C
OUT
= 100μF Ceramic,
100μF POSCAP R
FB
= 6.65k
,
V
IN
= 2.7V to 5.5V,
I
OUT
= I
OUT(DC)MIN
to I
OUT(DC)MAX
(Note 4)
SV
IN
Rising
SV
IN
Falling
CONDITIONS
●
ELECTRICAL CHARACTERISTICS
MIN
2.7
1.472
●
TYP
MAX
5.5
UNITS
V
V
V
V
V
V
OUT1(DC)
, V
OUT2(DC)
Output Voltage, Total Variation
with Line and Load
1.49
1.49
2.2
2.0
1.508
1.516
2.35
2.15
1.464
2.05
1.85
Input Specifications
V
IN1(UVLO)
,
V
IN2(UVLO)
Undervoltage Lockout Threshold
4616fa
2
LTM4616
ELECTRICAL CHARACTERISTICS
SYMBOL
I
Q(VIN1, VIN2)
PARAMETER
Input Supply Bias Current
The
●
denotes the specifications which apply over the –40°C to 125°C
internal operating temperature range. T
A
= 25°C, V
IN
= 5V unless otherwise noted. Per the typical application in Figure 18. Specified
as each channel (Note 3).
CONDITIONS
V
IN
= 3.3V, V
OUT
= 1.5V, No Switching, Mode = V
IN
V
IN
= 3.3V, V
OUT
= 1.5V, No Switching, Mode = 0V
V
IN
= 3.3V, V
OUT
= 1.5V, Switching Continuous
V
IN
= 5V, V
OUT
= 1.5V, No Switching, Mode = V
IN
V
IN
= 5V, V
OUT
= 1.5V, No Switching, Mode = 0V
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 5V
MIN
TYP
400
1.15
55
450
1.3
75
1
4.5
2.93
MAX
UNITS
μA
mA
mA
μA
mA
mA
μA
A
A
I
S(VIN1, VIN2)
Output Specifications
I
OUT1(DC),
I
OUT2(DC)
Input Supply Current
V
IN
= 3.3V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 8A
Output Continuous Current Range V
OUT
= 1.5V
(Note 4)
V
IN
= 3.3V, 5.5V
V
IN
= 2.7V
Line Regulation Accuracy
Load Regulation Accuracy
V
OUT
= 1.5V, V
IN
from 2.7V to 5.5V, I
OUT
= 0A
V
OUT
= 1.5V (Note 4)
V
IN
= 3.3V, 5.5V, I
LOAD
= 0A to 8A
V
IN
= 2.7V, I
LOAD
= 0A to 5A
I
OUT
= 0A, C
OUT
= 100μF X5R Ceramic, V
IN
= 5V,
V
OUT
= 1.5V
I
OUT
= 8A, V
IN
= 5V, V
OUT
= 1.5V
C
OUT
= 100μF, V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 3.3V
V
IN
= 5V
C
OUT
= 100μF, V
OUT
= 1.5V, V
IN
= 5V,
I
OUT
= 1A Resistive Load, Track = V
IN
●
0
0
0.1
8
5
0.25
A
A
%/V
ΔV
OUT1(LINE)
/V
OUT1
ΔV
OUT2(LINE)
/V
OUT2
ΔV
OUT1(LOAD)
/V
OUT1
ΔV
OUT2(LOAD)
/V
OUT2
●
●
0.3
0.3
10
1.25
0.75
10
10
100
20
1.5
0.5
0.5
%
%
mV
P-P
V
OUT1(AC)
, V
OUT2(AC)
Output Ripple Voltage
f
S1,
f
S2
f
SYNC1,
f
SYNC2
ΔV
OUT1(START),
ΔV
OUT2(START)
t
START1,
t
START2
ΔV
OUT1(LS),
ΔV
OUT2(LS)
t
SETTLE1,
t
SETTLE2
I
OUT1(PK),
I
OUT2(PK)
Switching Frequency
SYNC Capture Range
Turn-On Overshoot
1.75
2.25
MHz
MHz
mV
mV
μs
mV
Turn-On Time
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100μF Ceramic x2, 470μF POSCAP
,
V
IN
= 5V, V
OUT
= 1.5V
Settling Time for Dynamic Load
Step
Output Current Limit
Load: 0% to 50% to 0% of Full Load, V
IN
= 5V,
V
OUT
= 1.5V, C
OUT
= 100μF
C
OUT
= 100μF
V
IN
= 2.7V, V
OUT
= 1.5V
V
IN
= 3.3V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 0A, V
OUT
= 1.5V, V
IN
= 2.7V to 5.5V
0.590
0.587
10
μs
8
11
13
0.596
0.596
90
0.2
0.602
0.606
A
A
A
V
V
μs
μA
1.7
1.5
V
V
V
V
V
Control Section
FB1, FB2
SS Delay
I
FB
V
RUN1,
V
RUN2
TRACK1, TRACK2
RUN Pin On/Off Threshold
Tracking Threshold (Rising)
Tracking Threshold (Falling)
Tracking Disable Threshold
RUN Rising
RUN Falling
RUN = V
IN
RUN = 0V
1.4
1.3
Voltage at FB Pin
Internal Soft-Start Delay
●
1.55
1.4
0.57
0.18
V
IN
– 0.5
4616fa
3
LTM4616
ELECTRICAL CHARACTERISTICS
SYMBOL
R
FBHI1,
R
FBHI2
PARAMETER
Resistor Between V
OUT
and FB
Pins
Output Voltage Margining
Percentage
MGN = V
IN
, BSEL = 0V
MGN = V
IN
, BSEL = V
IN
MGN = V
IN
, BSEL = Float
MGN = 0V, BSEL = 0V
MGN = 0V, BSEL = V
IN
MGN = 0V, BSEL = Float
The
●
denotes the specifications which apply over the –40°C to 125°C
internal operating temperature range. T
A
= 25°C, V
IN
= 5V unless otherwise noted. Per the typical application in Figure 18. Specified
as each channel (Note 3).
CONDITIONS
MIN
9.95
TYP
10
±10
4
9
14
–4
–9
–14
5
10
15
–5
–10
–15
6
11
16
–6
–11
–16
MAX
10.05
UNITS
kΩ
%
%
%
%
%
%
%
ΔV
PGOOD1,
ΔV
PGOOD2
PGOOD Range
%Margining
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 LTM4616E 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 LTM4616I is guaranteed to meet specifications over the full
internal operating temperature range. Note that the maximum ambient
temperature is determined by specific operating conditions in conjunction
with board layout, the rated package thermal resistance and other
environmental factors.
Note 3:
Two channels are tested separately and the same testing
conditions are applied to each channel.
Note 4:
See Output Current Derating curves for different V
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