troller, MOSFETs, inductor and all support components.
The device is housed in a small surface mount 15mm
×
15mm
×
2.82mm LGA package. Operating over an input
voltage range of 4.5V to 20V, the LTM4603 supports an
output voltage range of 0.6V to 5V as well as output volt-
age tracking and margining. The high efficiency design
delivers 6A continuous current (8A peak). Only bulk input
and output capacitors are needed to complete the design.
The low profile (2.82mm) and light weight (1.7g) package
easily mounts on the unused space on the back side of
PC boards for high density point of load regulation. The
µModule regulator can be synchronized with an external
clock for reducing undesirable frequency harmonics and
allows PolyPhase
®
operation for high load currents.
A high switching frequency and adaptive on-time current
mode architecture deliver a very fast transient response
to line and load changes without sacrificing stability. An
onboard remote sense amplifier can be used to accurately
regulate an output voltage independent of load current.
The onboard remote sense amplifier is not available in the
LTM4603-1. The LTM4603/LTM4603-1 are pin compatible
with the 12A LTM4601/LTM4601-1.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
n
n
n
n
n
n
n
n
n
n
n
n
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 20V
6A DC Typical, 8A Peak Output Current
0.6V to 5V Output Voltage
Output Voltage Tracking and Margining
Remote Sensing for Precision Regulation (LTM4603
Only)
Typical Operating Frequency: 1MHz
PLL Frequency Synchronization
1.5% Regulation
Current Foldback Protection (Disabled at Start-Up)
Pin Compatible with the LTM4601
Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
Ultrafast Transient Response
Current Mode Control
Up to 93% Efficiency at 5V
IN
, 3.3V
OUT
Programmable Soft-Start
Output Overvoltage Protection
Small Footprint, Low Profile (15mm
×
15mm
×
2.82mm) Surface Mount LGA Package
applications
n
n
n
n
Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
typical application
1.5V/6A Power Supply with 4.5V to 20V Input
V
IN
4.5V TO 20V
V
IN
PGOOD
ON/OFF
C
IN
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
CLOCK SYNC
TRACK/SS CONTROL
V
OUT
1.5V
6A
Efficiency vs Load Current with 12V
IN
100
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
45
40
4603 TA01a
100pF
MARGIN
CONTROL
40.2k
LTM4603
C
OUT
392k
5% MARGIN
PGND
f
SET
12V
IN
, 1.2V
OUT
12V
IN
, 1.5V
OUT
12V
IN
, 1.8V
OUT
12V
IN
, 2.5V
OUT
12V
IN
, 3.3V
OUT
12V
IN
, 5V
OUT
0
1
4
3
2
5
LOAD CURRENT (A)
6
7
4603 TA01b
4603fb
1
LTM4603/LTM4603-1
(Note 1)
absolute MaxiMuM ratings
pin conFiguration
INTV
CC
PLLIN
TRACK/SS
RUN
COMP
MPGM
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
LGA PACKAGE
118-LEAD (15mm
×
15mm
×
2.82mm)
T
JMAX
= 125°C,
θ
JA
= 15°C/W,
θ
JC
= 6°C/W
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS, WEIGHT = 1.7g
*LTM4603-1 ONLY
TOP VIEW
INTV
CC
, DRV
CC
, V
OUT_LCL
, V
OUT
(V
OUT
≤ 3.3V
with Remote Sense Amp)............................. –0.3V to 6V
PLLIN, TRACK/SS, MPGM, MARG0, MARG1,
PGOOD, f
SET
..............................–0.3V to INTV
CC
+ 0.3V
RUN ............................................................. –0.3V to 5V
V
FB
, COMP ................................................ –0.3V to 2.7V
V
IN
............................................................. –0.3V to 20V
V
OSNS+
, V
OSNS –
..........................–0.3V to INTV
CC
+ 0.3V
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range .................. –55°C to 125°C
V
IN
PGND
V
OUT
orDer inForMation
LEAD FREE FINISH
LTM4603EV#PBF
LTM4603IV#PBF
LTM4603EV-1#PBF
LTM4603IV-1#PBF
†
See Note 2.
TRAY
LTM4603EV#PBF
LTM4603IV#PBF
LTM4603EV-1#PBF
LTM4603IV-1#PBF
PART MARKING*
LTM4603V
LTM4603V
LTM4603V-1
LTM4603V-1
PACKAGE DESCRIPTION
118-Lead (15mm
×
15mm
×
2.82mm) LGA
118-Lead (15mm
×
15mm
×
2.82mm) LGA
118-Lead (15mm
×
15mm
×
2.82mm) LGA
118-Lead (15mm
×
15mm
×
2.82mm) LGA
TEMPERATURE RANGE
†
–40°C to 85°C
–40°C to 85°C
–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/
The
l
denotes the specifications which apply over the –40°C to 85°C
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page)
configuration.
SYMBOL
V
IN(DC)
V
OUT(DC)
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Undervoltage Lockout Threshold
Input Inrush Current at Start-Up
I
OUT
= 0A
I
OUT
= 0A. V
OUT
= 1.5V
V
IN
= 5V
V
IN
= 12V
3.2
0.6
0.7
4
V
A
A
4603fb
electrical characteristics
PARAMETER
Input DC Voltage
Output Voltage
CONDITIONS
l
MIN
4.5
1.478
1.478
TYP
MAX
20
UNITS
V
V
V
C
IN
= 10µF
×2,
C
OUT
= 2× 100µF X5R Ceramic
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 0A
l
l
1.5
1.5
1.522
1.522
2
LTM4603/LTM4603-1
The
l
denotes the specifications which apply over the –40°C to 85°C
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page)
configuration.
SYMBOL
I
Q(VIN,NOLOAD)
PARAMETER
Input Supply Bias Current
CONDITIONS
V
IN
= 12V, No Switching
V
IN
= 12V, 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
= 12V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 6A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 6A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 6A
No Load
V
IN
= 12V, V
OUT
= 1.5V (Note 5)
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
= 4.5V to 20V
V
OUT
= 1.5V, I
OUT
= 0A to 6A (Note 5)
V
IN
= 12V, with Remote Sense Amp
V
IN
= 12V, LTM4603-1
I
OUT
= 0A, C
OUT
= 2× 100µF X5R Ceramic
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 3A, V
IN
= 12V, V
OUT
= 1.5V
C
OUT
= 200µF V
OUT
= 1.5V, I
OUT
= 0A,
,
TRACK/SS = 10nF
V
IN
= 12V
V
IN
= 5V
C
OUT
= 200µF V
OUT
= 1.5V, TRACK/SS = Open,
,
I
OUT
= 1A Resistive Load
V
IN
= 12V
V
IN
= 5V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 2
×
22µF Ceramic, 470µF 4V
Sanyo POSCAP
V
IN
= 12V
V
IN
= 5V
l
electrical characteristics
MIN
TYP
3.8
25
2.5
43
22
MAX
UNITS
mA
mA
mA
mA
µA
A
A
A
I
S(VIN)
INTV
CC
I
OUTDC
∆V
OUT(LINE)
V
OUT
∆V
OUT(LOAD)
V
OUT
V
OUT(AC)
f
S
ΔV
OUT(START)
Input Supply Current
0.92
1.83
2.12
4.7
0
5
5.3
6
0.3
V
IN
= 12V, RUN > 2V
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
V
A
%
Output Specifications
l
l
0.25
0.5
10
10
1000
%
%
mV
P-P
mV
P-P
kHz
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Overshoot
20
20
mV
mV
t
START
Turn-On Time
0.5
0.5
ms
ms
ΔV
OUTLS
Peak Deviation for Dynamic Load
35
35
25
8
8
0
0
1
3
2
INTV
CC
– 1
INTV
CC
– 1
1.25
mV
mV
µs
A
A
V
V
mV
V/V
MHz
V/µs
4603fb
t
SETTLE
I
OUTPK
Settling Time for Dynamic Load Step Load: 0% to 50% to 10% of Full Load
V
IN
= 12V
Output Current Limit
C
OUT
= 2× 100µF X5R Ceramic
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
Remote Sense Amp (LTM4603 Only, Not Supported in the LTM4603-1) (Note 3)
V
OSNS+
, V
OSNS–
CM Range
DIFFV
OUT
Range
V
OS
AV
GBP
SR
Common Mode Input Voltage Range V
IN
= 12V, RUN > 2V
Output Voltage Range
Input Offset Voltage Magnitude
Differential Gain
Gain Bandwidth Product
Slew Rate
V
IN
= 12V, DIFFV
OUT
Load = 100k
3
LTM4603/LTM4603-1
The
l
denotes the specifications which apply over the –40°C to 85°C
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V, per typical application (front page)
configuration.
SYMBOL
R
IN
CMRR
Control Stage
V
FB
V
RUN
I
TRACK/SS
t
ON(MIN)
t
OFF(MIN)
R
PLLIN
I
DRVCC
R
FBHI
V
MPGM
V
MARG0
, V
MARG1
PGOOD Output
ΔV
FBH
ΔV
FBL
ΔV
FB(HYS)
V
PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V
FB
Rising
V
FB
Falling
V
FB
Returning (Note 4)
I
PGOOD
= 5mA
7
–7
10
–10
1.5
0.15
13
–13
3
0.4
%
%
%
V
Error Amplifier Input Voltage
Accuracy
RUN Pin On/Off Threshold
Soft-Start Charging Current
Minimum On Time
Minimum Off Time
PLLIN Input Resistance
Current into DRV
CC
Pin
Resistor Between V
OUT_LCL
and V
FB
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 1.5V, I
OUT
= 1A, DRV
CC
= 5V
60.098
V
TRACK/SS
= 0V
(Note 4)
(Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
l
electrical characteristics
PARAMETER
Input Resistance
Common Mode Rejection Ratio
CONDITIONS
V
OSNS+
to GND
MIN
TYP
20
100
MAX
UNITS
kW
dB
0.594
1
–1
0.6
1.5
–1.5
50
250
50
20
60.4
1.18
1.4
0.606
1.9
–2
100
400
27
60.702
V
V
µA
ns
ns
kW
mA
kW
V
V
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 LTM4603/LTM4603-1 is tested under pulsed load conditions
such that T
J
≈ T
A
. The LTM4603E/LTM4603E-1 are 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
LTM4603I/LTM4603I-1 are guaranteed over the –40°C to 85°C operating
temperature range.
Note 3:
Remote sense amplifier recommended for ≤3.3V output.
Note 4:
100% tested at wafer sort only.
Note 5:
See output current derating curves for different V
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