Linear Technology LTM4637EV Demo Board, µModule Regulator, 4.5V ≤ VIN ≤ 20V, Vout = 1V to 1.8V @ 20A DC1872A DC1872A Datenbogen
Produktcode
DC1872A
LTM4637
1
4637fc
Typical applicaTion
DescripTion
20A DC/DC µModule
Step-Down Regulator
The
switch mode step-down DC/DC µModule (micromodule)
regulator. Included in the package are the switching control-
ler, power FETs, inductor and compensation components.
Operating over an input voltage range from 4.5V to 20V,
the LTM4637 supports an output voltage range of 0.6V
to 5.5V, set by a single external resistor. Only a few input
and output capacitors are needed.
Current mode operation allows precision current sharing
Current mode operation allows precision current sharing
of up to four LTM4637 regulators to obtain up to 80A
output. High switching frequency and a current mode
architecture 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 transis-
tor is available for use as an internal temperature monitor.
The LTM4637 is offered in 15mm
The LTM4637 is offered in 15mm
× 15mm × 4.32mm LGA
and 15mm
× 15mm × 4.92mm packages. The LTM4637
is available with SnPb (BGA) or RoHS compliant terminal
finish. The LTM4637 is pin compatible with the
a 15A DC/DC µModule regulator.
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.
12V
IN
, 1.2V
OUT
, 20A DC/DC µModule
®
Regulator
FeaTures
applicaTions
n
Complete 20A Switch Mode Power Supply
n
4.5V to 20V Input Voltage Range
n
0.6V to 5.5V Output Voltage Range
n
±1.5% Total DC Output Voltage Error
(–40°C to 125°C)
n
Differential Remote Sense Amplifier for Precision
Regulation for (V
OUT
≤ 3.3V)
n
Current Mode Control/Fast Transient Response
n
Parallel Current Sharing (Up to 80A)
n
Frequency Synchronization
n
Selectable Pulse-Skipping or Burst Mode
®
Operation
n
Soft-Start/Voltage Tracking
n
Up to 88% Efficiency (12V
IN
, 1.8V
OUT
)
n
Overcurrent Foldback Protection
n
Output Overvoltage Protection
n
Internal Temperature Monitor
n
Overtemperature Protection
n
15mm
× 15mm × 4.32mm LGA and
15mm
× 15mm × 4.92mm BGA Packages
n
SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish
n
Telecom Servers and Networking Equipment
n
Industrial Equipment
n
Medical Systems
n
High Ambient Temperature Systems
12V
IN
Efficiency vs Load Current
COMP
TRACK/SS
RUN
f
SET
MODE_PLLIN
TEMP
PGOOD
V
OUT
V
OUT_LCL
DIFF_OUT
V
OSNS
+
V
OSNS
–
VFB
LTM4637
V
IN
10k
R
FB
**
60.4k
22µF
16V
×4
0.1µF
100µF*
6.3V
×2
470µF
6.3V
×2
V
OUT
1.2V
20A
330pF
INTV
CC
2.2µF
EXTV
CC
* SEE TABLE 5
** SEE TABLE 1
4637 TA01a
V
IN
12V
SGND
GND
+
OUTPUT CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
100
2
10
14
4637 TA01b
75
95
8
18 20
4
6
12
16
1.2V
OUT
250kHz
CCM