spectrum operation, output voltage tracking for supply
rail sequencing and voltage margining.
Fault protection features include overvoltage protection,
overcurrent protection and thermal shutdown. The power
module is offered in a compact and thermally enhanced
9mm
×
15mm
×
2.82mm LGA package. The LTM4608 is
RoHS compliant with Pb-free finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Complete Standalone Power Supply
±1.5%
Output Voltage Regulation
2.7V to 5.5V Input Voltage Range
8A DC, 10A Peak Output Current
0.6V Up to 5V Output
Output Voltage Tracking and Margining
Power Good Tracking and Margining
Multiphase Operation
Parallel Current Sharing
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Overcurrent/Thermal Shutdown Protection
Small Surface Mount Footprint, Low Profile
(9mm
×
15mm
×
2.82mm) LGA Package
applicaTions
n
n
n
Telecom, Networking and Industrial Equipment
Storage Systems
Point of Load Regulation
For easier board layout and PCB assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4608A.
Typical applicaTion
2.7V to 5.5V Input to 1.8V Output DC/DC µModule
®
Regulator
100
CLKIN
95
EFFICIENCY (%)
V
IN
2.7V TO 5.5V
10µF
V
IN
SV
IN
SW
RUN
PLLLPF
TRACK
LTM4608
CLKIN
V
OUT
FB
I
TH
I
THM
PGOOD
MGN
4608 TA01a
Efficiency vs Load Current
V
OUT
1.8V
100µF
4.87k
V
IN
= 3.3V
90
V
IN
= 5V
85
80
75
70
V
OUT
= 1.8V
0
2
4
6
LOAD CURRENT (A)
8
10
4608 TA01b
PGOOD
CLKOUT GND SGND
4608fd
1
LTM4608
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
A
1
2
3
4
5
6
7
8
9
10
11
GND
V
OUT
CNTRL
SW
B
C
V
IN
D
E
F
G
GND
CNTRL GND
V
IN
, SV
IN
...................................................... –0.3V to 6V
CLKOUT ....................................................... –0.3V to 2V
PGOOD, PLLLPF, CLKIN, PHMODE, MODE .. –0.3V to V
IN
I
TH
, I
THM
, RUN, FB, TRACK, MGN, BSEL..... –0.3V to V
IN
V
OUT
, V
SW
..................................... –0.3V to (V
IN
+ 0.3V)
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range .................. –55°C to 125°C
For easier board layout and PCB assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4608A.
LGA PACKAGE
68-LEAD (15mm × 9mm × 2.82mm)
T
JMAX
= 125°C,
θ
JA
= 25°C/W,
θ
JCbottom
= 7°C/W,
θ
JCtop
= 50°C/W, WEIGHT = 1.0g
orDer inForMaTion
LEAD FREE FINISH
LTM4608EV#PBF
LTM4608IV#PBF
PART MARKING*
LTM4608V
LTM4608V
PACKAGE DESCRIPTION
68-Lead (15mm
×
9mm
×
2.82mm) LGA
68-Lead (15mm
×
9mm
×
2.82mm) LGA
TEMPERATURE RANGE (NOTE 2)
–40°C to 85°C
–40°C to 85°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/
elecTrical characTerisTics
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
The
l
denotes the specifications which apply over the full operating
temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted. See Figure 1.
CONDITIONS
l
MIN
2.7
TYP
MAX
5.5
UNITS
V
C
IN
= 10µF
×
1, C
OUT
= 100µF Ceramic,
100µF POSCAP, R
FB
= 6.65k, MODE = 0V
V
IN
= 2.7V to 5.5V, V
OUT
= 1.5V, I
OUT
= 0A
l
1.475
1.468
2.05
1.85
1.49
1.49
2.2
2.0
1.505
1.512
2.35
2.15
V
V
V
V
Input Specifications
V
IN(UVLO)
Undervoltage Lockout Threshold
SV
IN
Rising
SV
IN
Falling
4608fd
2
LTM4608
elecTrical characTerisTics
SYMBOL
I
Q(VIN)
PARAMETER
Input Supply Bias Current
The
l
denotes the specifications which apply over the full operating
temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted. See Figure 1.
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(VIN)
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 Specifications
I
OUT(DC)
Output Continuous Current Range V
OUT
= 1.5V
V
IN
= 3.3V, 5.5V
(See Output Current Derating
Curves for Different V
IN
, V
OUT
V
IN
= 2.7V
and T
A
)
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
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
1.3
0.75
10
10
100
15
l
0
0
0.1
8
5
0.2
A
A
%/V
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
f
S
f
SYNC
ΔV
OUT(START)
t
START
ΔV
OUT(LS)
t
SETTLE
I
OUT(PK)
l
l
0.3
0.3
10
1.5
0.75
0.75
%
%
mV
P-P
Output Ripple Voltage
Switching Frequency
SYNC Capture Range
Turn-On Overshoot
1.7
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, 100µF 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
l
10
µs
8
11
13
0.592
0.589
0.596
0.596
90
0.2
0.600
0.603
A
A
A
V
V
µs
µA
1.7
1.5
V
V
Control Section
V
FB
SS Delay
I
FB
V
RUN
RUN Pin On/Off Threshold
RUN Rising
RUN Falling
1.4
1.3
Voltage at FB Pin
Internal Soft-Start Delay
1.55
1.4
4608fd
3
LTM4608
elecTrical characTerisTics
SYMBOL
TRACK
PARAMETER
Tracking Threshold (Rising)
Tracking Threshold (Falling)
Tracking Disable Threshold
Resistor Between V
OUT
and FB
Pins
PGOOD Range
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
4
9
14
–4
–9
–14
The
l
denotes the specifications which apply over the full operating
temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted. See Figure 1.
CONDITIONS
RUN = V
IN
RUN = 0V
9.95
MIN
TYP
0.57
0.18
V
IN
– 0.5
10
±10
5
10
15
–5
–10
–15
6
11
16
–6
–11
–16
10.05
MAX
UNITS
V
V
V
kΩ
%
%
%
%
%
%
%
R
FBHI
ΔV
PGOOD
%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 LTM4608E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTM4608I is guaranteed over the
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