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PDF LTM4620A Data sheet ( Hoja de datos )
| Número de pieza | LTM4620A | |
| Descripción | Dual 13A or Single 26A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4620A
Dual 13A or Single 26A
DC/DC µModule Regulator
Features
Description
n Dual 13A or Single 26A Output
n Wide Input Voltage Range: 4.5V to 16V
n Output Voltage Range: 0.6V to 5.3V
n ±1.5% Maximum Total DC Output Error
n Multiphase Current Sharing with Multiple
LTM4620As Up to 100A
n Higher Efficiency and Wider VOUT Range Than LTM4620
n Differential Remote Sense Amplifier
n Current Mode Control/Fast Transient Response
n Adjustable Switching Frequency
n Overcurrent Foldback Protection
n Frequency Synchronization
n Internal Temperature Sensing Diode Output
n Output Overvoltage Protection
n Pin Compatible with the LTM4628 (Dual 8A) and
LTM4620 (Dual 13A)
n 15mm × 15mm × 4.41mm LGA Package
The LTM®4620A is a complete dual 13A, or single 26A output
switchingmode DC/DC power supplywith widerVOUT range
and higher efficiency than the LTM4620. Included in the
package are the switching controller, power FETs, inductors
and all supporting components. Operating from an input
voltage range of 4.5V to 16V, the LTM4620A supports two
outputs each with an output voltage range of 0.6V to 5.3V,
set by a single external resistor. Its high efficiency design
delivers up to 13A continuous current for each output. Only
a few input and output capacitors are needed.
Thedevicesupportsfrequencysynchronization, multiphase
operation, Burst Mode® operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring. High
switching frequency and a current mode architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Applications
n Telecom and Networking Equipment
n Industrial Equipment
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Fault protection features include overvoltage and over-
current protection. The power module is offered in a
proprietary space saving and thermally enhanced 15mm
× 15mm × 4.41mm LGA package. The LTM4620A is
RoHS compliant.
Typical Application
26A, 5V Output DC/DC µModule® Regulator
VIN
7V TO 16V
10k*
22µF
25V 120k
×4
5.1V*
0.1µF INTVCC
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL
INTVCC
4.7µF
VOUT
INTVCC
5k
MODE_PLLIN
VIN
TEMP
RUN1
RUN2
TRACK1
TRACK2
fSET
PHASMD
CLKOUT INTVCC
LTM4620A
SGND GND
DIFFP
EXTVCC PGOOD1
VOUT1
VOUTS1
DIFFOUT
SW1
VFB1
VFB2
COMP1
COMP2
VOUTS2
VOUT2
SW2
PGOOD2
DIFFN
PGOOD
100µF
6.3V
×2
220pF
8.25k
PGOOD
100µF
6.3V
×2
4620A TA01a
VOUT
5V
26A
For more information www.linear.com/4620A
5V Efficiency vs IOUT
100
95
90
85
8V TO 5V EFF (650kHz)
12V TO 5V EFF (750kHz)
80
1 3 5 8 10 12 14 16 19 21 23
TOTAL OUTPUT CURRENT (A)
4620A TA01b
4620af
1
1 page  
Typical Performance Characteristics
Efficiency vs Output Current,
VIN = 5V
100
95
90
85
80
5V TO 1V (400kHz)
5V TO 1.2V (400kHz)
5V TO 1.5V (400kHz)
75 5V TO 1.8V (500kHz)
5V TO 2.5V (500kHz)
70 5V TO 3.3V (500kHz)
1 2.4 3.8 5.2 6.6 8.0 9.4 10.8 12.2
OUTPUT CURRENT (A)
4620A G01
12V to 1V Load Step Response
Efficiency vs Output Current,
VIN = 8V
100
95
90
85 8V TO 1V (400kHz)
8V TO 1.2V (400kHz)
80
8V TO 1.5V (500kHz)
8V TO 1.8V (600kHz)
8V TO 2.5V (650kHz)
75 8V TO 3.3V (700kHz)
8V TO 5V (750kHz)
70 TIE 5VOUT TO EXTVCC
1 2.4 3.8 5.2 6.6 8.0 9.4 10.8 12.2
OUTPUT CURRENT (A)
4620A G02
12V to 1.2V Load Step Response
LTM4620A
Efficiency vs Output Current,
VIN = 12V
100
95
90
85 12V TO 1V (400kHz)
12V TO 1.2V (400kHz)
80 12V TO 1.5V (500kHz)
12V TO 1.8V (600kHz)
12V TO 2.5V (650kHz)
75 12V TO 3.3V (700kHz)
12V TO 5V (750kHz)
70 TIE 5VOUT TO EXTVCC
1 2.4 3.8 5.2 6.6 8.0 9.4 10.8 12.2
OUTPUT CURRENT (A)
4620A G03
12V to 1.5V Load Step Response
20mV/DIV
20mV/DIV
50mV/DIV
5A/DIV
6A/µs STEP
5A/DIV
6A/µs STEP
5A/DIV
6A/µs STEP
50µs/DIV
CFF = 150pF
COUT = 2 × 470µF 9mΩ EACH POSCAP
1 × 100µF CERAMIC
4620A G04
50µs/DIV
CFF = 150pF
COUT = 2 × 470µF 9mΩ EACH POSCAP
1 × 100µF CERAMIC
4620A G05
50µs/DIV
CFF = 47pF
COUT = 220µF 9mΩ POSCAP
100µF CERAMIC
4620A G06
12V to 1.8V Load Step Response
12V to 2.5V Load Step Response
12V to 3.3V Load Step Response
50mV/DIV
5A/DIV
6A/µs STEP
50µs/DIV
CFF = 33pF
COUT = 220µF 9mΩ POSCAP
100µF CERAMIC
50mV/DIV
5A/DIV
6A/µs STEP
4620A G07
50µs/DIV
CFF = 100pF
COUT = 220µF 9mΩ POSCAP
100µF CERAMIC
100mV/DIV
5A/DIV
6A/µs STEP
4620A G08
50µs/DIV
CFF = 33pF
COUT = 100µF 15mΩ POSCAP
100µF CERAMIC
4620A G09
For more information www.linear.com/4620A
4620af
5
5 Page 
LTM4620A
Applications Information
The typical LTM4620A application circuit is shown in
Figure 26. External component selection is primarily
determined by the maximum load current and output
voltage. Refer to Table 5 for specific external capacitor
requirements for particular applications.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN and VOUT step-
down ratio that can be achieved for a given input voltage.
Each output of the LTM4620A is capable of 95% duty cycle
at 500kHz, but the VIN to VOUT minimum dropout is still
shown as a function of its load current and will limit output
current capability related to high duty cycle on the top side
switch. Minimum on-time tON(MIN) is another consideration
in operating at a specified duty cycle while operating at
a certain frequency due to the fact that tON(MIN) < D/fSW,
where D is duty cycle and fSW is the switching frequency.
tON(MIN) is specified in the electrical parameters as 90ns.
See Note 8 in the Electrical Characteristics section for
output current guideline.
Output Voltage Programming
The PWM controller has an internal 0.6V reference voltage.
As shown in the Block Diagram, a 60.4kΩ internal feedback
resistor connects between the VOUTS1 to VFB1 and VOUTS2
to VFB2. It is very important that these pins be connected
to their respective outputs for proper feedback regulation.
Overvoltage can occur if these VOUTS1 and VOUTS2 pins are
left floating when used as individual regulators, or at least
one of them is used in paralleled regulators. The output
voltage will default to 0.6V with no feedback resistor on
either VFB1 or VFB2. Adding a resistor RFB from VFB pin to
GND programs the output voltage:
resistors to the output. All of the VFB pins tie together with
one programming resistor as shown in Figure 2.
In parallel operation, the VFB pins have an IFB current of 20nA
maximum each channel. To reduce output voltage error due
to this current, an additional VOUTS pin can be tied to VOUT,
and an additional RFB resistor can be used to lower the total
Thevenin equivalent resistance seen by this current. For
example in Figure2,the total Thevenin equivalent resistance
of the VFB pin is (60.4k//RFB), which is 30.2k where RFB is
equal to 60.4k for a 1.2V output. Four phases connected
in parallel equates to a worse case feedback current of
4 • IFB = 80nA maximum. The voltage error is 80nA • 30.2k
= 2.4mV. If VOUTS2 is connected, as shown in Figure 2, to
VOUT, and another 60.4k resistor is connected from VFB2
to ground, then the voltage error is reduced to 1.2mV. If
the voltage error is acceptable then no additional connec-
tions are necessary. The onboard 60.4k resistor is 0.5%
accurate and the VFB resistor can be chosen by the user to
be as accurate as needed. All COMP pins are tied together
for current sharing between the phases. The TRACK pins
can be tied together and a single soft-start capacitor can
be used to soft-start the regulator. The soft-start equation
will need to have the soft-start current parameter increased
by the number of paralleled channels. See TRACK/Soft-
Start Pin section.
COMP1 LTM4620A
COMP2
VOUT1
VOUT2
TRACK1
TRACK2
60.4k
60.4k
VOUTS1
VOUTS2
VFB1
VFB2
4 PARALLELED OUTPUTS
FOR 1.2V AT 50A
OPTIONAL CONNECTION
VOUT
=
0.6V
•
60.4k + RFB
RFB
COMP1 LTM4620A
COMP2
VOUT1
VOUT2
OPTIONAL
RFB
60.4k
Table 1. VFB Resistor Table vs Various Output Voltages
VOUT 0.6V 1.0V 1.2V 1.5V 1.8V 2.5V 3.3V
RFB Open 90.9k 60.4k 40.2k 30.2k 19.1k 13.3k
5V
8.25k
For parallel operation of multiple channels the same feed-
back setting resistor can be used for the parallel design.
This is done by connecting the VOUTS1 to the output as
shown in Figure 2, thus tying one of the internal 60.4k
0.1µF
TRACK1
TRACK2
60.4k
60.4k
VOUTS1
VOUTS2
VFB1
VFB2
4620A F02
USE TO LOWER
TOTAL EQUIVALENT
RESISTANCE TO LOWER
IFB VOLTAGE ERROR
RFB
60.4k
Figure 2. 4-Phase Parallel Configurations
For more information www.linear.com/4620A
4620af
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4620A.PDF ] | |
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