LTM4661
15V, 4A Step-Up
µModule Regulator
FEATURES
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DESCRIPTION
The
LTM
®
4661
is a synchronous step-up switching
mode µModule
®
(power module) regulator in a 6.25mm
× 6.25mm × 2.42mm BGA package. Included in the pack-
age are the switching controller, power FETs, inductor and
all support components. Operating over an input voltage
of 1.8V to 5.5V, down to 0.7V after start-up, the LTM4661
regulates an output voltage of 2.5V to 15V set by an exter-
nal resistor. It provides up to 4A switch current. Only bulk
input and output capacitors are needed.
The LTM4661 1MHz switching frequency and dual phase
single output architecture enable fast transient response
to line and load changes and a significant reduction of
output ripple voltage. It supports frequency synchroni-
zation, PolyPhase
®
operation and selectable Burst Mode
operation.
The LTM4661 features a true output disconnect during
shutdown and inrush current limit at start-up. It also has
short-circuit, overvoltage and overtemperature protection.
The LTM4661 is Pb-free and RoHS compliant.
All registered trademarks and trademarks are the property of their respective owners.
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Complete Solution in <1cm
2
(Single-Sided PCB) or
0.5cm
2
(Dual-Sided PCB)
Input Voltage Range: 1.8V to 5.5V, Down to 0.7V
After Start-Up
Output Voltage Range: 2.5V to 15V
4A Switch Current
Dual Phase Operation
±3% Maximum Total DC Output Voltage Regulation
Over Load, Line and Temperature
Output Disconnect in Shut Down
Inrush Current Limit
External Frequency Synchronization
Selectable Burst Mode
®
Operation
Output Overvoltage and Overtemperature Protection
6.25mm × 6.25mm × 2.42mm BGA package
APPLICATIONS
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RF Microwave Power Amplifiers
Battery Powered DC Motors
3.3V Bus Telecom Transceivers
TYPICAL APPLICATION
5V/2A DC/DC Step-Up µModule Regulator
Efficiency vs Output Current at 3.3V Input
100
FREQ
V
IN
3.3V
22µF ×2
6.3V
V
IN
SDB
MODE/SYNC
INTV
CC
2.2µF
GND
4661 TA01a
V
OUT
= 5V
COMP
22µF ×2
16V
R1
31.6k
EFFICIENCY (%)
V
OUT
5V/2A
95
90
85
80
75
70
LTM4661 V
OUT
FB
0
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
LOAD CURRENT (A)
2
4661 TA01b
Document Feedback
For more information
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1
Rev. A
LTM4661
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
OUT
(See Pin Functions, Pin Configuration Table)
V
IN
.............................................................. –0.3V to 6V
V
OUT
........................................................... –0.3V to 18V
COMP, FREQ ......................................... –0.3V to INTV
CC
SYNC/MODE, SDB ....................................... –0.3V to 6V
Operating Internal Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range .................. –55°C to 125°C
Peak Solder Reflow Body Temperature ................. 250°C
SDB
5
FB
GND
4
COMP
INTV
CC
3
FREQ
SYNC/MODE
2
GND
V
IN
1
C
D
E
BGA PACKAGE
25-Lead (6.25mm × 6.25mm × 2.42mm)
T
JMAX
= 125°C,
θ
JCtop
= 17°C/W,
θ
JCbottom
= 11°C/W,
θ
JB
+
θ
BA
= 22°C/W,
θ
JA
= 22°C/W
WEIGHT = 0.25g
A
B
ORDER INFORMATION
PART MARKING*
PART NUMBER
LTM4661EY#PBF
LTM4661IY#PBF
LTM4661IY
PAD OR BALL FINISH
SAC305 (RoHS)
SAC305 (RoHS)
SnPb (63/37)
DEVICE
LTM4661Y
LTM4661Y
LTM4661Y
FINISH CODE
e1
e1
e0
PACKAGE
TYPE
BGA
BGA
BGA
MSL
RATING
4
4
4
TEMPERATURE RANGE
(Note 2)
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
• Contact the factory for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures
•
LGA and BGA Package and Tray Drawings
2
Rev. A
For more information
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LTM4661
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
IN(MIN)
V
OUT(RANGE)
V
OUT(DC)
I
Q(VIN)
I
S(VIN)
I
OUT(DC)
ΔV
OUT
(Line)/V
OUT
V
OUT(AC)
ΔV
OUT(START)
t
START
ΔV
OUTLS
t
SETTLE
V
FB
I
FB
R
FBHI
Duty(MIN)
Duty(MAX)
SDB Input Voltage
I
SDB
V
INTVCC
f
OSC
SYNC Range
SYNC/MODE
I
SYNC/MODE
SDB Input Current
Internal V
CC
Voltage
Switching Frequency
SYNC Frequency Range
Sync Input High Voltage
Sync Input Low Voltage
SYNC/MODE = 5.5V
0.5
1.6
0.35
1
2
PARAMETER
Input DC Voltage
Minimum Start-Up Voltage
Output Voltage Range
Output Voltage, Total
R
FB
= 31.6k, SYNC/MODE = INTV
CC
Variation with Line and Load V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 0A to 2A
Input Supply Bias Current
V
IN
= 3.3V, V
OUT
= 5V, SYNC/MODE = INTV
CC
, I
OUT
= 5mA
V
IN
= 3.3V, V
OUT
= 5V, SYNC/MODE = GND, I
OUT
= 5mA
Shutdown, SDB = 0, V
IN
= 3.3V
Input Supply Current
Output Continuous Current
Range
Line Regulation Accuracy
Output Ripple Voltage
Turn-On Overshoot
Turn-On Time
Peak Deviation for Dynamic
Load
Settling Time for Dynamic
Load Step
Voltage at V
FB
Pin
Current at V
FB
Pin
Resistor Between V
OUT
and
V
FB
Pins
Minimum Duty Cycle
Maximum Duty Cycle
FB = 1.4V (Note 4)
FB = 1.0V (Note 4)
SDB Input High
SDB Input Low
SDB = 5.5V
V
IN
< 2.8V, V
OUT
> 5V
3.9
90
94
1.2
0.35
1
4.25
1
1.5
2
4.6
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 2A
V
IN
= 3.3V, V
OUT
= 5V (Note 3)
V
IN
= 3.3V, V
OUT
= 12V
V
OUT
= 12V, V
IN
= 1.8V to 5.5V, I
OUT
= 0A
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 0A to 2A
I
OUT
= 0A, C
OUT
= 2×22µF Ceramic
V
IN
= 3.3V, V
OUT
= 5V
I
OUT
= 0A, C
OUT
= 2×22µF Ceramic,
V
IN
= 3.3V, V
OUT
= 5V
C
OUT
= 2×22µF Ceramic,
No Load, V
IN
= 3.3V, V
OUT
= 5V
Load: 0% to 25% to 0% of Full Load
C
OUT
= 2×22µF Ceramic, V
IN
= 3.3V, V
OUT
= 5V
Load: 0% to 25% to 0% of Full Load
C
OUT
= 2×22µF Ceramic, V
IN
= 3.3V, V
OUT
= 5V
I
OUT
= 0A, V
IN
= 3.3V, V
OUT
= 5V, SYNC/MODE = INTV
CC
(Note 4)
99.5
l
l
l
The
l
denotes the specifications which apply over the specified internal
operating temperature range, otherwise specifications are at T
A
= 25°C (Note 2), V
IN
= 3.3V, per the typical application.
CONDITIONS
V
OUT
≥ 2.5V
V
OUT
= 0V
l
l
l
l
MIN
0.7
TYP
MAX
5.5
UNITS
V
V
V
mA
mA
µA
A
Switching Regulator Section: per Channel
1.6
2.5
4.85
5
10
8.5
0.5
3.7
0
0
0.1
0.1
3
30
10
200
500
1.17
1.2
1
100
1.23
50
100.5
0
2
0.7
0.5
2
1.8
15
5.15
A
A
%/V
%
mV
mV
ms
mV
uS
V
nA
kΩ
%
%
V
V
µA
V
MHz
MHz
V
V
µA
ΔV
OUT
(Load)/V
OUT
Load Regulation Accuracy
For more information
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3
Rev. A
LTM4661
ELECTRICAL CHARACTERISTICS
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 LTM4661 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4661E 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 LTM4661I is guaranteed to meet specifications over the
full –40°C to 125°C 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:
See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 4:
100% tested at wafer level.
Note 5:
The LTM4661 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 170°C when overtemperature shutdown is active.
Continuous operation above the specified maximum operation junction
temperature may result in device degradation or failure.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
V
IN
= 3.3V
93
91
89
EFFICIENCY (%)
EFFICIENCY (%)
87
85
83
81
79
77
75
73
0
V
OUT
= 5V, 2A DC
V
OUT
= 8V, 1A DC
V
OUT
= 12V, 0.65A DC
V
OUT
= 15V, 0.5A DC
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
LOAD CURRENT (A)
2
93
91
89
EFFICIENCY (%)
87
85
83
81
79
77
75
73
0
V
OUT
= 8V, 1.7A DC
V
OUT
= 12V, 1A DC
V
OUT
= 15V, 0.8A DC
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
LOAD CURRENT (A)
2
95
90
85
80
75
70
Efficiency vs Output Current,
V
IN
= 5V
100
Burst vs Continuous Mode
Efficiency, V
IN
= 3.3V
CONTINUOUS MODE
Burst Mode OPERATION
0
0.1
LOAD CURRENT (A)
1
4661 G03
4661 G01
4661 G02
5V Output Load Transient
Response
12V Output Load Transient
Response
V
OUT
(AC)
200mV/DIV
V
OUT
(AC)
200mV/DIV
LOAD STEP
500mA
TO 1A
500µs/DIV
V
IN
= 3.3V, V
OUT
= 5V
f
S
= 1MHz (DEFAULT)
500mA TO 1A LOAD STEP
C
OUT
= 2×22µF CERAMIC
4661 G04
LOAD STEP
200mA
TO 400mA
500µs/DIV
V
IN
= 3.3V, V
OUT
= 12V
f
S
= 1MHz (DEFAULT)
200mA TO 400mA LOAD STEP
C
OUT
= 2×22µF CERAMIC
4661 G05
4
Rev. A
For more information
www.analog.com
LTM4661
TYPICAL PERFORMANCE CHARACTERISTICS
Steady State Output Ripple
I
IN
200mA/DIV
V
IN
2V/DIV
V
OUT
(AC)
5mV/DIV
V
OUT
10V/DIV
SDB
2V/DIV
500µs/DIV
V
IN
= 3.3V,
V
OUT
= 5V
f
S
= 1MHz (DEFAULT)
C
OUT
= 2×22µF CERAMIC
4661 G06
Start-Up Waveform with No Load
Applied
500µs/DIV
V
IN
= 3.3V,
V
OUT
= 12V
f
S
= 1MHz (DEFAULT)
C
OUT
= 2×22µF CERAMIC
4661 G07
Start-Up Waveform with 0.5A
Load Applied
I
IN
200mA/DIV
V
IN
2V/DIV
V
OUT
10V/DIV
SDB
2V/DIV
500µs/DIV
V
IN
= 3.3V,
V
OUT
= 12V
f
S
= 1MHz (DEFAULT)
C
OUT
= 2×22µF CERAMIC
4661 G08
Short-Circuit Response
V
OUT
5V/DIV
I
IN
1A/DIV
500µs/DIV
V
IN
= 3.3V,
V
OUT
= 12V
f
S
= 1MHz (DEFAULT)
C
OUT
= 2×22µF CERAMIC
4661 G09
For more information
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5
Rev. A
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