LTM4639
Low V 20A DC/DC
IN
µModule Step-Down Regulator
FEATURES
DESCRIPTION
The LTM®4639 is a complete 20A output high efficiency
switch mode step-down DC/DC µModule (micromodule)
regulator. Included in the package are the switching
controller, power FETs, inductor and compensation
components. Operating over an input voltage range from
2.375V to 7V, the LTM4639 supports an output voltage
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Complete 20A Switch Mode Power Supply
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2.375V to 7V Input Voltage Range (V < 4.5V,
IN
Need C
Bias)
PWR
n
n
0.6V to 5.5V Output Voltage Range
1.5ꢀ Maꢁimum Total DC Output Voltage Error
(–40°C to 125°C)
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Differential Remote Sense Amplifier for Precision
Regulation (V ≤ 3.3V)
range of 0.6V to 5.5V, set by a single external resistor.
Only a few input and output capacitors are needed.
OUT
n
n
n
n
n
n
n
n
n
n
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Current Mode Control/Fast Transient Response
Parallel Multiphase Current Sharing (Up to 80A)
Frequency Synchronization
Currentmodeoperationallowsprecisioncurrentsharingof
up to four LTM4639 regulators to obtain up to 80A output.
Highswitchingfrequencyandacurrentmodearchitecture
enable a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, multiphase/current sharing,
Burst Mode operation and output voltage tracking for
supply rail sequencing. A diode-connected PNP transistor
is included for use as an internal temperature monitor. For
up to 20V input operation, please see the LTM4637.
Selectable Pulse-Skipping or Burst Mode® Operation
Soft-Start/Voltage Tracking
Up to 88% Efficiency (3.3V , 1.5V
)
IN
OUT
Overcurrent Foldback Protection
Output Overvoltage Protection
Internal Temperature Monitor
Overtemperature Protection
15mm × 15mm × 4.92mm BGA Package
The LTM4639 is offered in a 15mm × 15mm × 4.92mm
BGA package. The LTM4639 is RoHS compliant.
L, LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology, the Linear logo are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210, 8163643.
APPLICATIONS
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Telecom Servers and Networking Equipment
Industrial Equipment
Medical Systems
High Ambient Temperature Systems
3.3V Input Systems
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TYPICAL APPLICATION
3.3V to 1.5V Efficiency
and Power Loss
3.3VIN, 1.5VOUT, 20A DC/DC µModule® Regulator
+5V BIAS
100
95
90
85
80
75
70
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.2µF
EFFICIENCY
1µF
V
IN
3.3V
22µF
6.3V
×4
C
COMPA
V
C
EXTV INTV PGOOD
IN PWR
CC
CC
V
1.5V
20A
180pF
OUT
COMPA
COMPB
TRACK/SS
RUN
V
OUT
OUT_LCL
0.1µF
5k
V
C
*
FF
100µF*
6.3V
×2
+
680µF*
2.5V
×2
180pF
DIFF_OUT
+
LTM4639
C
= 5V
PWR
FREQ = 400kHz
V
POWER LOSS
OSNS
f
SET
–
V
OSNS
100k
MODE_PLLIN
V
FB
GND OT_TEST
+
TEMP
R
**
C
*
0
2
4
6
8
10 12 14 16 18 20
FB
40.2k
BOT
22pF
–
TEMP
SGND
OUTPUT CURRENT (A)
4639 TA01b
* SEE TABLE 5
** SEE TABLE 1
4639 TA01a
4639f
1
For more information www.linear.com/LTM4639
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