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PDF LTM4619 Data sheet ( Hoja de datos )
| Número de pieza | LTM4619 | |
| Descripción | Dual 26VIN 4A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Complete Standalone Power Supply
n Wide Input Voltage Range: 4.5V to 26.5V
(EXTVCC Available for VIN ≤ 5.5V)
n Dual 180° Out-of-Phase Outputs with 4A DC
Typical, 5A Peak Output Current for Each
n Dual Outputs with 0.8V to 5V VOUT Range
n Output Voltage Tracking
n ±1.5% Total DC Output Error
n Current Mode Control/Fast Transient Response
n Power Good
n Phase-Lockable Fixed Frequency 250kHz to 780kHz
n On Board Frequency Synchronization
n Parallel Current Sharing
n Selectable Burst Mode® Operation
n Output Overvoltage Protection
n Small Surface Mount Footprint, Low Profile
(15mm × 15mm × 2.8mm) LGA Package
APPLICATIONS
n Telecom and Networking Equipment
n Servers
n Storage Cards
n ATCA Cards
n Industrial Equipment
n Point of Load Regulation
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and μModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM4619www.DataSheet4U.com
Dual, 26VIN, 4A DC/DC
µModule Regulator
DESCRIPTION
The LTM®4619 is a complete dual 4A step-down switch-
ing mode DC/DC power supply. Included in the package
are the switching controller, power FETs, inductor, and all
support components. Operating over input voltage ranges
of 4.5V to 26.5V, the LTM4619 supports two outputs with
voltage ranges of 0.8V to 5V, each set by a single external
resistor. Its high efficiency design delivers 4A continuous
current (5A peak) for each output.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The two outputs are
interleaved with 180° phase to minimize the ripple noise and
reduce the I/O capacitors. The device supports frequency
synchronization and output voltage tracking for supply
rail sequencing. Burst Mode operation or pulse-skipping
mode can be selected for light load operations.
Fault protection features include overvoltage protection,
overcurrent protection and foldback current limit for
short-circuit protection.
The low profile package (2.8mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. The power module is offered in a
space saving and thermally enhanced 15mm × 15mm ×
2.8mm LGA package. The LTM4619 is Pb-free and RoHS
compliant.
TYPICAL APPLICATION
Dual 4A 3.3V/2.5V DC/DC μModule® Regulator
5.5V TO 26.5V
VOUT1
2.5V/4A
10μF 28k
s2
MODE/PLLIN INTVCC
VIN FREQ/PLLFLTR
VFB1
VFB2
22pF COMP1
COMP2
100μF
VOUT1
TK/SS1
LTM4619
VOUT2
TK/SS2
0.1μF RUN1
RUN2
PGOOD
SGND
EXTVCC
PGND
4619 TA01a
19.1k
22pF
0.1μF
VOUT2
3.3V/4A
100μF
Efficiency and Power Loss at 12V input
95 2.0
90 EFFICIENCY
85 1.5
80
75 1.0
70
POWER LOSS
65 0.5
60 2.5VOUT
3.3VOUT
55 0
0 0.5 1 1.5 2 2.5 3 3.5 4
LOAD CURRENT (A)
4619 TA01b
4619f
1
1 page  
LTM4619www.DataSheet4U.com
TYPICAL PERFORMANCE CHARACTERISTICS (Refer to Figures 18 and 19)
1.2V Output Transient Response
1.5V Output Transient Response
2.5V Output Transient Response
IOUT
1A/DIV
VOUT
50mV/DIV
IOUT
1A/DIV
VOUT
50mV/DIV
IOUT
1A/DIV
VOUT
50mV/DIV
100μs/DIV
6VIN 1.2VOUT AT 2A/μs LOAD STEP
f = 780kHz
COUT 2s 22μF, 6.3V X5R CERAMIC
COUT 1s 330μF, 6.3V SANYO POSCAP
4619 G04
100μs/DIV
6VIN 1.5VOUT AT 2A/μs LOAD STEP
f = 780kHz
COUT 2s 22μF, 6.3V X5R CERAMIC
COUT 1s 330μF, 6.3V SANYO POSCAP
4619 G05
100μs/DIV
6VIN 2.5VOUT AT 2A/μs LOAD STEP
f = 780kHz
COUT 2s 22μF, 6.3V X5R CERAMIC
COUT 1s 330μF, 6.3V SANYO POSCAP
4619 G06
3.3V Output Transient Response
Start-Up, IOUT = 0A
Start-Up, IOUT = 4A
IOUT
1A/DIV
VOUT
50mV/DIV
100μs/DIV
6VIN 3.3VOUT AT 2A/μs LOAD STEP
f = 780kHz
COUT 2s 22μF, 6.3V X5R CERAMIC
COUT 1s 330μF, 6.3V SANYO POSCAP
4619 G07
VIN
1V/DIV
IIN
0.5A/DIV
20ms/DIV
VIN = 12V, VOUT = 2.5V, IOUT = 0A
COUT = 2s 22μF 10V
AND 1s 100μF 6.3V CERAMIC CAPs
CSOFTSTART = 0.1μF
USE RUN PIN TO CONTROL START-UP
4619 G08
VIN
1V/DIV
IIN
0.5A/DIV
20ms/DIV
VIN = 12V, VOUT = 2.5V,
IOUT = 4A RESISTIVE LOAD
COUT = 2s 22μF 10V,
AND 1s 100μF 6.3V CERAMIC CAPs
CSOFTSTART = 0.1μF
USE RUN PIN TO CONTROL START-UP
4619 G09
Short Circuit, IOUT = 0A
VOUT
1V/DIV
IIN
0.5A/DIV
50μs/DIV
VIN = 12V, VOUT = 2.5V, IOUT = 0A
COUT = 2s 22μF 10V,
AND 1s 100μF 6.3V CERAMIC CAPs
4619 G10
Short Circuit, IOUT = 4A
VOUT
1V/DIV
IIN
0.5A/DIV
50μs/DIV
VIN = 12V, VOUT = 2.5V, IOUT = 4A
COUT = 2s 22μF 10V,
AND 1s 100μF 6.3V CERAMIC CAPs
4619 G11
4619f
5
5 Page 
LTM4619www.DataSheet4U.com
APPLICATIONS INFORMATION
Soft-Start and Tracking
The LTM4619 has the ability to either soft-start by itself
with a capacitor or track the output of another channel or
external supply. When one particular channel is configured
to soft-start by itself, a capacitor should be connected to
its TK/SS pin. This channel is in the shutdown state if its
RUN pin voltage is below 1.2V. Its TK/SS pin is actively
pulled to ground in this shutdown state.
Once the RUN pin voltage is above 1.2V, the channel pow-
ers up. A soft-start current of 1.3μA then starts to charge
its soft-start capacitor. Note that soft-start or tracking is
achieved not by limiting the maximum output current of
the controller but by controlling the output ramp voltage
according to the ramp rate on the TK/SS pin. Current
foldback is disabled during this phase to ensure smooth
soft-start or tracking. The soft-start or tracking range is
defined to be the voltage range from 0V to 0.8V on the
TK/SS pin. The total soft-start time can be calculated as:
tSOFT-START
=
0.8V • CSS
1.3µA
Output voltage tracking can be programmed externally
using the TK/SS pin. The master channel is divided down
with an external resistor divider that is the same as the
slave channel’s feedback divider to implement coincident
tracking. The LTM4619 uses an accurate 60.4k resistor
internally for the top feedback resistor. Figure 3 shows an
example of coincident tracking. Figure 4 shows the output
voltages with coincident tracking.
VSLAVE
=
⎛
⎝⎜
1+
R1⎞
R2 ⎠⎟
•
VTRACK
VTRACK is the track ramp applied to the slave’s TK/SS2
pin. VTRACK has a control range of 0V to 0.8V. When the
master’s output is divided down with the same resistor
values used to set the slave’s output, then the slave will
coincident track with the master until it reaches its final
value. The master will continue to its final value from the
slave’s regulation point.
Ratiometric modes of tracking can be achieved by select-
ing different divider resistors values to change the output
tracking ratio. The master output must be greater than the
slave output for the tracking to work. Master and slave
data inputs can be used to implement the correct resistors
values for coincident or ratio tracking.
VIN
5.5V TO
28V
VOUT1
3.3V
CIN
R3
19.1k
MODE/PLLIN INTVCC
VIN FREQ/PLLFLTR
C2
22pF
VFB1
VFB2
COMP1
COMP2
VOUT1 LTM4619 VOUT2
COUT1
C1
0.1μF
TK/SS1
RUN1
TK/SS2
RUN2
PGOOD
SGND
EXTVCC
PGND
4619 F03
C3
22pF
R4
28k
VOUT2
2.5V
COUT2
VOUT1
R1
60.4k
R2
28k
OUTPUT
VOLTAGE
MASTER OUTPUT
SLAVE OUTPUT
TIME
4619 F04
Figure 3. Example of Coincident Tracking
Figure 4. Coincident Tracking
4619f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM4619.PDF ] | |
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