FEATURES
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LTM4603/LTM4603-1
6A DC/DC µModule
with PLL, Output Tracking
and Margining
DESCRIPTIO
The LTM
®
4603 is a complete 6A step-down switch mode
DC/DC power supply with onboard switching controller,
MOSFETs, inductor and all support components. The
µModule
TM
is housed in a small surface mount 15mm
×
15mm
×
2.8mm LGA package. Operating over an input
voltage range of 4.5 to 20V, the LTM4603 supports an
output voltage range of 0.6V to 5V as well as output voltage
tracking and margining. The high efficiency design deliv-
ers 6A continuous current (8A peak). Only bulk input and
output capacitors are needed to complete the design.
The low profile (2.8mm) and light weight (1.73g) package
easily mounts on the unused space on the back side of
PC boards for high density point of load regulation. The
µModule 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.
, LT, LTC, LTM and PolyPhase 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.
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 ×
2.8mm) Surface Mount LGA Package
APPLICATIO S
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Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
TYPICAL APPLICATIO
V
IN
4.5V TO 20V
V
IN
PGOOD
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
Efficiency vs Load Current with 12V
IN
1.00
0.95
CLOCK SYNC
TRACK/SS CONTROL
EFFICIENCY (%)
0.90
0.85
V
OUT
1.5V
6A
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0
4603 TA01a
4603 TA01b
1.5V/6A Power Supply with 4.5V to 20V Input
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
f
SET
100pF
MARGIN
CONTROL
13.3k
ON/OFF
C
IN
LTM4603
C
OUT
392k
5% MARGIN
PGND
U
1
U
U
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
4
3
2
5
OUTPUT CURRENT (A)
6
7
4603f
1
LTM4603/LTM4603-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
INTV
CC
PLLIN
TRACK/SS
RUN
COMP
MPGM
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–
.................................. 0V to INTV
CC
– 1V
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
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
´
2.8mm)
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
ORDER PART NUMBER
LTM4603EV#PBF
LTM4603IV#PBF
LTM4603EV-1#PBF
LTM4603IV-1#PBF
LGA PART MARKING*
LTM4603V
LTM4603V
LTM4603V-1
LTM4603V-1
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
●
MIN
4.5
TYP
MAX
20
UNITS
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
I
OUT
= 0A
I
OUT
= 0A. V
OUT
= 1.5V
V
IN
= 5V
V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, No Switching
V
IN
= 12V, V
OUT
= 1.5V, Switching
Continuous
V
IN
= 5V, V
OUT
= 1.5V, No Switching
V
IN
= 5V, V
OUT
= 1.5V, Switching
Continuous
Shutdown, RUN = 0, V
IN
= 12V
●
●
1.478
1.478
1.5
1.5
3.2
0.6
0.7
3.8
25
2.5
43
22
1.522
1.522
4
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
Undervoltage Lockout Threshold
Input Inrush Current at Startup
V
A
A
mA
mA
mA
mA
µA
4603f
I
Q(VIN,NOLOAD)
Input Supply Bias Current
2
U
V
V
W
U
U
W W
W
LTM4603/LTM4603-1
ELECTRICAL CHARACTERISTICS
SYMBOL
I
S(VIN)
PARAMETER
Input Supply Current
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
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
4.7
0
MIN
TYP
0.85
1.78
2.034
5
5.3
6
MAX
UNITS
A
A
A
V
A
INTV
CC
Output Specifications
I
OUTDC
V
IN
= 12V, RUN > 2V
Output Continuous Current Range
V
IN
= 12V, V
OUT
= 1.5V
(See Output Current Derating Curves
for Different V
IN
, V
OUT
and T
A
)
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
= 4.5V to 20V
V
OUT
= 1.5V, I
OUT
= 0A to 6A
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
= 2×, 100µF/X5R/Ceramic,
V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 12V
V
IN
= 5V
C
OUT
= 2×, 100µF/X5R/Ceramic,
V
OUT
= 1.5V, I
OUT
= 1A Resisitive 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
●
V
OUT(NOM)
– V
OUT(ΔLINE)
Line Regulation Accuracy
V
OUT(NOM)
V
OUT(NOM)
– V
OUT(ΔLOAD)
Load Regulation Accuracy
V
OUT(NOM)
V
OUT(AC)
Output Ripple Voltage
0.3
%
●
●
0.25
0.5
10
10
1000
%
%
mV
P-P
mV
P-P
kHz
f
S
ΔV
OUT(START)
Output Ripple Voltage Frequency
Turn-On Overshoot,
TRACK/SS = 10nF
20
20
mV
mV
t
START
Turn-On Time, TRACK/SS = Open
0.5
0.7
ms
ms
ΔV
OUTLS
Peak Deviation for Dynamic Load
35
35
25
8
8
0
0
1
3
2
INTV
CC
– 1
INTV
CC
1.25
mV
mV
µs
A
A
V
V
mV
V/V
MHz
V/µs
kΩ
dB
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
R
IN
CMRR
Common Mode Input Voltage Range V
IN
= 12V, RUN > 2V
Output Voltage Range
Input Offset Voltage Magnitude
Differential Gain
Gain Bandwidth Product
Slew Rate
Input Resistance
Common Mode Rejection Ratio
V
OSNS+
to GND
V
IN
= 12V, DIFF OUT Load = 100k
20
100
4603f
3
LTM4603/LTM4603-1
The
●
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
SYMBOL
Control Stage
V
FB
V
RUN
I
SS/TRACK
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
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
and V
FB
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 1.5V, I
OUT
= 1A,
Frequency = 1MHz, DRV
CC
= 5V
60.098
V
SS/TRACK
= 0V
(Note 4)
(Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
●
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
0.594
1
–1
TYP
0.6
1.5
–1.5
50
250
50
18
60.4
1.18
1.4
MAX
0.606
1.9
–2
100
400
25
60.702
UNITS
V
V
µA
ns
ns
kΩ
mA
kΩ
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 LTM4603E/LTM4603-1 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 LTM4603E/LTM4603-1
are guaranteed and tested over the –40°C to 85°C temperature range.
Note 3:
Remote sense amplifier recommended for ≤3.3V output.
Note 4:
100% tested at wafer level only.
4603f
4
LTM4603/LTM4603-1
TYPICAL PERFOR A CE CHARACTERISTICS
(See Figure 18 for all curves)
Efficiency vs Load Current
with 5V
IN
1.00
0.95
0.90
EFFICIENCY (%)
0.85
EFFICIENCY (%)
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0
1
5V
IN
, 0.6V
OUT
5V
IN
, 1.2V
OUT
5V
IN
, 1.5V
OUT
5V
IN
, 1.8V
OUT
5V
IN
, 2.5V
OUT
5V
IN
, 3.3V
OUT
4
3
2
5
OUTPUT CURRENT (A)
6
7
4603 G01
EFFICIENCY (%)
1.2V Transient Response
LOAD STEP
1A/DIV
V
OUT
50mV/DIV
25µs/DIV
1.2V AT 3A/µs LOAD STEP
C
OUT
: 1x 22µF, 6.3V CERAMIC
1x 330µF, 4V SANYO POSCAP
2.5V Transient Response
LOAD STEP
1A/DIV
V
OUT
50mV/DIV
25µs/DIV
2.5V AT 3A/µs LOAD STEP
C
OUT
: 1x 22µF, 6.3V CERAMIC
1x 330µF, 4V SANYO POSCAP
U W
Efficiency vs Load Current
with 12V
IN
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0
1
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
4
3
2
5
OUTPUT CURRENT (A)
6
7
4603 G02
Efficiency vs Load Current
with 20V
IN
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0
1
20V
IN
, 1.5V
OUT
20V
IN
, 1.8V
OUT
20V
IN
, 2.5V
OUT
20V
IN
, 3.3V
OUT
20V
IN
, 5V
OUT
4
3
2
5
OUTPUT CURRENT (A)
6
7
4603 G03
1.5V Transient Response
1.8V Transient Response
LOAD STEP
1A/DIV
LOAD STEP
1A/DIV
V
OUT
50mV/DIV
V
OUT
50mV/DIV
4603 G04
25µs/DIV
1.5V AT 3A/µs LOAD STEP
C
OUT
: 1x 22µF, 6.3V CERAMIC
1x 330µF, 4V SANYO POSCAP
4603 G05
25µs/DIV
1.8V AT 3A/µs LOAD STEP
C
OUT
: 1x 22µF, 6.3V CERAMIC
1x 330µF, 4V SANYO POSCAP
4603 G06
3.3V Transient Response
LOAD STEP
1A/DIV
V
OUT
50mV/DIV
4603 G07
25µs/DIV
3.3V AT 3A/µs LOAD STEP
C
OUT
: 1x 22µF, 6.3V CERAMIC
1x 330µF, 4V SANYO POSCAP
4603 G08
4603f
5
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