|
|
PDF LTM4622 Data sheet ( Hoja de datos )
| Número de pieza | LTM4622 | |
| Descripción | Dual Ultrathin 2.5A Step-Down DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTM4622 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
LTM4622
Dual Ultrathin 2.5A
Step-Down DC/DC µModule Regulator
FEATURES
nn Complete Solution in <1cm2
nn Wide Input Voltage Range: 3.6V to 20V
nn 3.3V Input Compatible with VIN Tied to INTVCC
nn 0.6V to 5.5V Output Voltage
nn Dual 2.5A DC, 3A Peak Output Current
nn ±1.5% Maximum Total Output Voltage Regulation
Error Over Load, Line and Temperature
nn Current Mode Control, Fast Transient Response
nn External Frequency Synchronization
nn Multiphase Parallelable with Current Sharing
nn Output Voltage Tracking and Soft-Start Capability
nn Selectable Burst Mode® Operation
nn Overvoltage Input and Overtemperature Protection
nn Power Good Indicators
nn 6.25mm × 6.25mm × 1.82mm LGA Package
APPLICATIONS
nn General Purpose Point of Load Conversion
nn Telecom, Networking and Industrial Equipment
nn Medical Diagnostic Equipment
nn Test and Debug Systems
DESCRIPTION
The LTM®4622 is a complete dual 2.5A step-down switch-
ing mode µModule® (micromodule) regulator in a tiny
ultrathin 6.25mm × 6.25mm × 1.82mm LGA package.
Included in the package are the switching controller, power
FETs, inductor and support components. Operating over
an input voltage range of 3.6V to 20V, the LTM4622 sup-
ports an output voltage range of 0.6V to 5.5V, set by a
single external resistor. Its high efficiency design delivers
dual 2.5A continuous, 3A peak, output current. Only a few
ceramic input and output capacitors are needed.
The LTM4622 supports selectable Burst Mode operation
and output voltage tracking for supply rail sequencing. Its
high switching frequency and current mode control enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include input overvoltage, output
overcurrent and overtemperature protection.
The LTM4622 is RoHS compliant with Pb-free finish.
L, LT, LTC, LTM, µModule, Burst Mode, PolyPhase, Linear Technology and 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.
TYPICAL APPLICATION
1.5V and 1V Dual Output DC/DC Step-Down µModule Regulator
VIN
3.6V TO 20V
4.7µF
25V
PGOOD1 PGOOD2
VIN VOUT1
RUN1
RUN2 LTM4622 VOUT2
INTVCC
COMP1
SYNC/MODE
COMP2
TRACK/SS1
FB1
TRACK/SS2
FB2
FREQ
GND
VOUT1
47µF 1V, 2.5A
47µF
VOUT2
1.5V, 2.5A
40.2k 90.9k
4622 TA01a
1.5V Output Efficiency vs Load Current
95
90
85
80
75
70
65 VIN = 5V
60 VIN = 12V
0 0.5 1.0 1.5 2.0 2.5 3
LOAD CURRENT (A)
4622 TA01b
For more information www.linear.com/LTM4622
4622f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
3.3V Output Transient Response
5V Output Transient Response
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
VIN = 12V
20µs/DIV
4622 G09
VOUT = 3.3V
FS = 2MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
LOAD STEP
1A/DIV
VIN = 12V
VOUT = 5V
20µs/DIV
4622 G10
FS = 2.5MHz
OUTPUT CAPACITOR = 1 × 47µF CERAMIC
LOAD STEP = 1.25A TO 2.5A
LTM4622
Start-Up with No Load Current
Applied
SW
10V/DIV
VOUT
1V/DIV
RUN
10V/DIV
VIN = 12V
VOUT = 1.8V
20ms/DIV
4622 G11
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
SOFT-START CAP = 0.1µF
Start-Up with 2.5A Load Current
Applied
SW
10V/DIV
Short-Circuit with No Load
Current Applied
SW
10V/DIV
Short-Circuit with 2.5A Load
Current Applied
SW
10V/DIV
VOUT
1V/DIV
RUN
10V/DIV
VIN = 12V
200ms/DIV
VOUT = 1.8V
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
4622 G12
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
SOFT-START CAP = 0.1µF
VOUT
1V/DIV
IIN
2A/DIV
VIN = 12V
VOUT = 1.8V
20µs/DIV
4622 G13
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
Recover from Short-Circuit with
No Load Current Applied
Steady-State Output Voltage
Ripple
SW
10V/DIV
VOUT
1V/DIV
IIN
2A/DIV
VOUT
10mV/DIV
AC-COUPLED
SW
5V/DIV
VIN = 12V
20µs/DIV
VOUT = 1.8V
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
4622 G15
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
VIN = 12V
1µs/DIV
4622 G16
VOUT = 1.8V
FS = 1MHz
INPUT CAPACITOR = 1 × 22µF
OUTPUT CAPACITOR = 1 × 22µF + 1 × 47µF CERAMIC
VOUT
1V/DIV
IIN
500mA/DIV
VIN = 12V
VOUT = 1.8V
20µs/DIV
4622 G14
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
Start-Up into Pre-Biased Output
SW
10V/DIV
VOUT
1V/DIV
RUN
10V/DIV
VIN = 12V
VOUT = 1.8V
50ms/DIV
4622 G17
IFNSP=U1TMCHAzPACITOR = 1 × 22µF
OUTPUTCAPACITOR=1×22µF+1×47µF CERAMIC
For more information www.linear.com/LTM4622
4622f
5
5 Page 
LTM4622
APPLICATIONS INFORMATION
The LTM4622 device is an inherently current mode con-
trolled device, so parallel modules will have very good
current sharing. This will balance the thermals on the
design. Please tie RUN, TRACK/SS, FB and COMP pin of
each paralleling channel together. Figure 28 shows an
example of parallel operation and pin connection.
INPUT RMS Ripple Current Cancellation
Application Note 77 provides a detailed explanation of
multiphase operation. The input RMS ripple current can-
cellation mathematical derivations are presented, and a
graph is displayed representing the RMS ripple current
reduction as a function of the number of interleaved phases.
Figure 3 shows this graph.
Soft-Start and Output Voltage Tracking
The TRACK/SS pin provides a means to either soft-start
the regulator or track it to a different power supply. A
capacitor on the TRACK/SS pin will program the ramp rate
of the output voltage. An internal 1.4µA current source
will charge up the external soft-start capacitor towards
INTVCC voltage. When the TRACK/SS voltage is below
0.6V, it will take over the internal 0.6V reference voltage
to control the output voltage. The total soft-start time
can be calculated as:
tSS
=
0.6
•
CSS
1.4µA
where CSS is the capacitance on the TRACK/SS pin. Current
foldback and force continuous mode are disabled during
the soft-start process.
The LTM4622 has internal 400μs soft-start time when
TRACK/SS leave floating.
Output voltage tracking can also be programmed externally
using the TRACK/SS pin. The output can be tracked up and
0.60
1-PHASE
0.55
2-PHASE
3-PHASE
4-PHASE
0.50 6-PHASE
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
DUTY FACTOR (VOUT/VIN)
4622 F03
Figure 3. Input RMS Current Ratios to DC Load Current as a Function of Duty Cycle
For more information www.linear.com/LTM4622
4622f
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM4622.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTM4620 | Dual 13A or Single 26A DC/DC iModule Regulator |  Linear |
| LTM4620A | Dual 13A or Single 26A DC/DC uModule Regulator | Linear Technology |
| LTM4622 | Dual Ultrathin 2.5A Step-Down DC/DC uModule Regulator | Linear Technology |
| LTM4623 | 3A Step-Down DC/DC uModule Regulator | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |