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PDF LTM4650A-1 Data sheet ( Hoja de datos )
| Número de pieza | LTM4650A-1 | |
| Descripción | Dual 25A or Single 50A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
LTM4650A-1
Dual 25A or Single 50A
DC/DC µModule Regulator
with 1% DC Accuracy
DESCRIPTION
nn Dual 25A or Single 50A Output
nn Input Voltage Range: 4.5V to 16V
nn Output Voltage Range: 0.6V to 5.5V
nn ±1% Maximum Total DC Output Error Over Line,
Load and Temperature
nn Higher Light Load Efficiency and Wider VOUT Range
Than LTM4650-1
nn Adjustable Control Loop Compensation
nn Differential Remote Sense Amplifier
nn Current Mode Control/Fast Transient Response
nn Multiphase Parallel Current Sharing Up to 300A
nn Internal Temperature Monitor
nn Adjustable Switching Frequency or Synchronization
nn Overcurrent Foldback Protection
nn Selectable Burst Mode® Operation, Pulse-Skipping
Mode Operation
nn Soft-Start/Voltage Tracking
nn Output Overvoltage Protection
nn 16mm × 16mm × 5.01mm BGA Package
APPLICATIONS
nn Telecom and Networking Equipment
nn Storage and ATCA Cards
nn Industrial Equipment
The LTM®4650A-1 is a dual 25A or single 50A output
switching mode step-down DC/DC µModule® (micromod-
ule) regulator with ±1% total DC output error. Included in
the package are the switching controllers, power FETs,
inductors and all supporting components. Operating from
an input voltage range of 4.5V to 16V, the LTM4650A-1
supports two outputs with an output voltage range of 0.6V
to 5.5V, each set by a single external resistor. Its high ef-
ficiency design delivers up to 25A continuous current for
each output. Only a few input and output capacitors are
needed. Adjustable control loop compensation allows for
fast transient response to minimize output capacitance
when powering FPGAs, ASICs, and processors.
Fault protection features include overvoltage and overcur-
rent protection. The LTM4650A-1 is offered in 16mm ×
16mm × 5.01mm BGA package.
LTM4650 Product Family Selection Table
LTM4650
LTM4650-1B
LTM6450-1A
RAVNINGE
4.5V to
15V
RVAONUGTE
IOUT
0.6V to
1.8V
25A × 2
LTM4650A 4.5V to 0.6V to
LTM4650A-1 16V
5.5V
COMPEN-
SATION
Internal
External
Internal
External
ACDCCUVROAUCTY
1.5%
0.8%
1%
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode, PolyPhase and
LTpowerCAD are registered trademarks of Analog Devices, Inc. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919,
5929620, 6100678, 6144194, 6177787, 6304066 and 6580258. Other patents pending.
TYPICAL APPLICATION
50A, 3.3V Output DC/DC µModule Regulator
INTVCC
VIN
4.5V TO 16V
22µF
25V
×4
4.7µF
120k
0.1µF
PINS UNUSED IN
THIS APPLICATION:
CLKOUT
EXTVCC
SW1
SW2
VOUTS2
INTVCC
RTH
CTH
10k
PGOOD
INTVCC
VIN
TEMP
TRACK1
TRACK2
fSET
COMP1
PGOOD1
LTM4650A-1
PGOOD2
VOUT1
VOUTS1
DIFFOUT
VFB1
VFB2
COMP2
RUN1
RUN2
PHASMD
SGND
VOUT2
DIFFP
DIFFN
GND MODE_PLLIN
4650a1 TA01a
100µF +
6.3V
470µF
6.3V
13.3k
100µF
6.3V
+
VOUT
3.3V/50A
470µF
6.3V
For more information www.linear.com/LTM4650A-1
3.3VOUT Efficiency vs IOUT
100
95
90
85
80
75
70 12 VIN, 3.3VOUT, 600kHz
5 VIN, 3.3VOUT, 600kHz
65
0 10 20 30 40 50
LOAD CURRENT (A)
4650a1 TA01b
4650a1f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
VIN = 5V
100
95
90
85
80
1.0VOUT, 300kHz
75
1.2VOUT, 400kHz
1.5VOUT, 400kHz
70
1.8VOUT, 500kHz
2.5VOUT, 500kHz
3.3VOUT, 600kHz
65
0 5 10 15 20 25
LOAD CURRENT (A)
4650a1 G01
1V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
Efficiency vs Output Current,
VIN = 12V
100
95
90
85
80 1.0VOUT, 300kHz
1.2VOUT, 400kHz
75 1.5VOUT, 400kHz
1.8VOUT, 500kHz
70
2.5VOUT, 500kHz
35..30VVOOUUTT,,
600kHz
750kHz
65
0 5 10 15 20 25
LOAD CURRENT (A)
4650a1 G02
1.2V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
LTM4650A-1
Burst Mode and Pulse-Skip Mode
Efficiency VIN=12V, VOUT = 1.2V,
fS = 400kHz
100
90
80
70
60
50
40
30
20
10
0
0.01
Burst Mode OPERATION
PULSE-SKIP MODE
CCM
0.1 1
LOAD CURRENT (mA)
10
4650a1 G03
1.5V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
VOUT(AC)
50mV/DIV
VOUT(AC)
50mV/DIV
VOUT(AC)
50mV/DIV
LOAD STEP
10A/DIV
LOAD STEP
10A/DIV
LOAD STEP
10A/DIV
100µs/DIV
12VIN, 1VOUT, 300kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G04
100µs/DIV
12VIN, 1.2VOUT, 400kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G05
100µs/DIV
12VIN, 1.5VOUT, 400kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G06
1.8V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
2.5V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
3.3V Dual Phase Single Output
Load Transient Response
(Ceramic Output Capacitor Only)
VOUT(AC)
50mV/DIV
VOUT(AC)
50mV/DIV
VOUT(AC)
50mV/DIV
LOAD STEP
10A/DIV
LOAD STEP
10A/DIV
LOAD STEP
10A/DIV
100µs/DIV
12VIN, 1.8VOUT, 500kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G07
100µs/DIV
12VIN, 2.5VOUT, 500kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G08
100µs/DIV
12VIN, 3.3VOUT, 600kHz,
DUAL PHASE SINGLE OUTPUT
25%, 12.5A LOAD STEP-UP AND
STEP-DOWN, 10A/μs SLEW RATE
COUT = 8× 220μF CERAMIC CAP
RTH = 3.32k, CTH = 6800pF, CFF = 68pF
4650a1 G09
For more information www.linear.com/LTM4650A-1
4650a1f
5
5 Page 
LTM4650A-1
OPERATION
Power Module Description
The LTM4650A-1 is a dual-output standalone nonisolated
switching mode DC/DC power supply with ±1% total DC
output error over line, load and temperature variation. It
can provide two 25A outputs or single 50A output with
few external input and output capacitors and setup com-
ponents. This module provides precisely regulated output
voltages programmable via external resistors from 0.6VDC
to 5.5VDC over 4.5V to 16V input voltages. The typical
application schematic is shown in Figure 34.
The LTM4650A-1 has dual integrated constant-frequency
current mode regulators and built-in power MOSFET
devices with fast switching speed. The typical switching
frequency is 300kHz to 750kHz depending on different
input and output conditions. For switching-noise sensi-
tive applications, it can be externally synchronized from
250kHz to 780kHz. A resistor can be used to program a
free run frequency on the fSET pin. See the Applications
Information section.
With current mode control, multi LTM4650A-1s can
be easily paralleled to provide up to 300A current with
guaranteed perfect current sharing. Also, with current
mode control, the LTM4650A-1 module is able to achieve
sufficient stability margins and a very fast ±3% output
transient response with a minimum number of output
capacitors, even with all ceramic output capacitors. This
makes LTM4650A-1 the best candidate when powering
FPGAs, ASICs and processors in terms of DC accuracy,
AC transient response, high output current and accuracy
current sharing. See Applications Information section.
Current mode control provides cycle-by-cycle fast current
limit and foldback current limit in an overcurrent condition.
Internal overvoltage and undervoltage comparators pull
the open-drain PGOOD outputs low if the output feedback
voltage exits a ±10% window around the regulation point.
As the output voltage exceeds 10% above regulation, the
bottom MOSFET will turn on to clamp the output voltage.
The top MOSFET will be turned off. This overvoltage protect
is feedback voltage referred.
Pulling the RUN pins below 1.1V forces the regulators into
a shutdown state, by turning off both MOSFETs. The TRACK
pins are used for programming the output voltage ramp and
voltage tracking during start-up or used for soft-starting
the regulator. See the Applications Information section.
The LTM4650A-1 has a built-in 10pF high frequency filter
cap from COMP to SGND for each output. An external RC
filtering circuit is required to achieve fast Type II control
loop compensation. Table 6 provides a guide line for
input, output capacitances and R-C values on COMP pin
for several operating conditions. The Linear Technology
µModule Power Design Tool (LTpowerCAD®) will be pro-
vided for transient and stability analysis. The VFB pin is
used to program the output voltage with a single external
resistor to ground. A differential remote sense amplifier is
available for sensing the output voltage accurately on one
of the outputs at the load point, or in parallel operation
sensing the output voltage at the load point.
High efficiency at light loads can be accomplished with
selectable Burst Mode operation or pulse-skipping opera-
tion using the MODE_PLLIN pin. These light load features
will accommodate battery operation. Efficiency graphs are
provided for light load operation in the Typical Performance
Characteristics section. See the Applications Information
section for details.
A general purpose temperature diode is included inside
the module to monitor the temperature of the module. See
the Applications Information section for details.
The switch pins are available for functional operation
monitoring and a resistor-capacitor snubber circuit can
be careful placed on the switch pin to ground to dampen
any high frequency ringing on the transition edges. See
the Applications Information section for details.
For more information www.linear.com/LTM4650A-1
4650a1f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4650A-1.PDF ] | |
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