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Linear Technology - 20A DC/DC uModule Step-Down Regulator

Numéro de référence LTM4639
Description 20A DC/DC uModule Step-Down Regulator
Fabricant Linear Technology 
Logo Linear Technology 





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LTM4639 fiche technique
LTM4639
FEATURES
Low VIN 20A DC/DC
µModule Step-Down Regulator
DESCRIPTION
n Complete 20A Switch Mode Power Supply
n 2.375V to 7V Input Voltage Range (VIN < 4.5V,
Need CPWR Bias)
n 0.6V to 5.5V Output Voltage Range
n ±1.5% Maximum Total DC Output Voltage Error
(–40°C to 125°C)
n Differential Remote Sense Amplifier for Precision
Regulation (VOUT ≤ 3.3V)
n Current Mode Control/Fast Transient Response
n Parallel Multiphase 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 (3.3VIN, 1.5VOUT)
n Overcurrent Foldback Protection
n Output Overvoltage Protection
n Internal Temperature Monitor
n Overtemperature Protection
n 15mm × 15mm × 4.92mm BGA Package
APPLICATIONS
n Telecom Servers and Networking Equipment
n Industrial Equipment
n Medical Systems
n High Ambient Temperature Systems
n 3.3V Input Systems
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
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 of
up to four LTM4639 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 transistor
is included for use as an internal temperature monitor. For
up to 20V input operation, please see the LTM4637.
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.
TYPICAL APPLICATION
3.3VIN, 1.5VOUT, 20A DC/DC µModule® Regulator
+5V BIAS
VIN
3.3V 22µF
6.3V
×4
CCOMPA
180pF
5k 0.1µF
100k
* SEE TABLE 5
** SEE TABLE 1
1µF 2.2µF
VIN CPWR EXTVCC INTVCC PGOOD
COMPA
VOUT
COMPB
TRACK/SS
RUN LTM4639
fSET
MODE_PLLIN
VOUT_LCL
DIFF_OUT
VOSNS+
VOSNS–
TEMP+
VFB
TEMPSGND GND OT_TEST
CFF*
180pF
100µF*+
6.3V
×2
VOUT
1.5V
20A
680µF*
2.5V
×2
RFB**
40.2k
CBOT*
22pF
4639 TA01a
For more information www.linear.com/LTM4639
3.3V to 1.5V Efficiency
and Power Loss
100 4.5
95
EFFICIENCY
4.0
3.5
90 3.0
2.5
85
2.0
80
CPWR = 5V
FREQ = 400kHz
75
POWER LOSS
1.5
1.0
0.5
70 0
0 2 4 6 8 10 12 14 16 18 20
OUTPUT CURRENT (A)
4639 TA01b
4639f
1

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