|
|
PDF LTM4625 Data sheet ( Hoja de datos )
| Número de pieza | LTM4625 | |
| Descripción | 5A Step-Down DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTM4625 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
LTM4625
20VIN, 5A Step-Down DC/DC
µModule Regulator
FEATURES
nn Complete Solution in <1cm2 (Single-Sided PCB) or
0.5cm2 (Dual-Sided PCB)
nn Wide Input Voltage Range: 4V to 20V
nn Input Voltage Down to 2.375V with External Bias
nn 0.6V to 5.5V Output Voltage
nn 5A DC Output Current
nn ±1.5% Maximum Total DC Output Voltage Error
Over Line, Load and Temperature
nn Current Mode Control, Fast Transient Response
nn External Frequency Synchronization
nn Multiphase Parallel Current Sharing with
Multiple LTM4625s
nn Output Voltage Tracking
nn Selectable Discontinuous Mode
nn Power Good Indicator
nn Overvoltage, Overcurrent and Overtemperature
Protection
nn 6.25mm × 6.25mm × 5.01mm BGA Package
APPLICATIONS
nn Telecom, Datacom, Networking and
Industrial Equipment
nn Medical Diagnostic Equipment
nn Data Storage Rack Units and Cards
nn Test and Debug Systems
DESCRIPTION
The LTM®4625 is a complete 5A step-down switching
mode µModule (micromodule) regulator in a tiny 6.25mm
× 6.25mm × 5.01mm BGA package. Included in the pack-
age are the switching controller, power FETs, inductor and
support components. Operating over an input voltage range
of 4V to 20V or 2.375V to 20V with an external bias supply,
the LTM4625 supports an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers up to 5A continuous output current. Only
bulk input and output capacitors are needed.
The LTM4625 supports selectable discontinuous mode
operation and output voltage tracking for supply rail se-
quencing. 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 overvoltage, overcurrent
and overtemperature protection.
The LTM4625 is available with SnPb or RoHS compliant
terminal finish.
L, LT, LTC, LTM, µModule, 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
5A, 1.5V Output DC/DC µModule® Step-Down Regulator
VIN
4V TO 20V
10µF
0.1µF
CLKIN PHMODE CLKOUT
VIN VOUT
SVIN
RUN LTM4625
INTVCC
PGOOD
MODE
COMP
TRACK/SS
FB
FREQ
GND SGND
VOUT
1.5V
47µF 5A
40.2k
4625 TA01a
1.5V Output Efficiency vs Load Current
95
90
85
80
75
70
65 VIN = 5V
VIN = 12V
60
012345
LOAD CURRENT (A)
4625 TA01b
For more information www.linear.com/LTM4625
4625fa
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up with No Load Current
Start-Up with 5A Load Current
LTM4625
Short-Circuit with No Load
Applied
VOUT
0.5V/DIV
IIN
2A/DIV
VOUT
0.5V/DIV
IIN
2A/DIV
VOUT
0.5V/DIV
IIN
500mA/DIV
5ms/DIV
4625 G09
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
Short-Circuit with 5A Load
Applied
5ms/DIV
4625 G10
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
20µs/DIV
4625 G11
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Recovery from Short-Circuit with
No Load Applied
VOUT
0.5V/DIV
IIN
500mA/DIV
50µs/DIV
4625 G12
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
VOUT
0.5V/DIV
IIN
1A/DIV
20µs/DIV
4625 G13
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Steady-State Output Voltage
Ripple
Start Into Pre-Biased Output
VOUT
5mV/DIV
AC-COUPLED
1µs/DIV
4625 G14
VIN = 12V
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
20MHz BW
VIN
5V/DIV
VOUT
0.5V/DIV
5ms/DIV
4625 G15
VIN = 12V
VOUT = 1.5V WITH 0.75V PREBIASED VOLTAGE
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
For more information www.linear.com/LTM4625
4625fa
5
5 Page 
LTM4625
APPLICATIONS INFORMATION
0
CLKIN CLKOUT
+120
PHMODE
PHASE 1
0
CLKIN CLKOUT
PHMODE
PHASE 1
+90
120
CLKIN CLKOUT
+120
PHMODE
PHASE 3
INTVCC
90
CLKIN CLKOUT
PHMODE
PHASE 2
240
CLKIN CLKOUT
PHMODE
PHASE 5
+90
+180
180
CLKIN CLKOUT
+90
PHMODE
PHASE 3
(420)
60
CLKIN CLKOUT
+120
PHMODE
PHASE 2
270
CLKIN CLKOUT
PHMODE
PHASE 4
180
CLKIN CLKOUT
+120
PHMODE
PHASE 4
INTVCC
Figure 2. 4-Phase, 6-Phase Operation
300
CLKIN CLKOUT
PHMODE
PHASE 6
4625 F02
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 CYCLE (VOUT/VIN)
4625 F03
Figure 3. RMS Input Ripple Current to DC Load Current Ratio as a Function of Duty Cycle
of phases used (assuming that the input voltage is greater
than the number of phases used times the output voltage).
The output ripple amplitude is also reduced by the number
of phases used when all of the outputs are tied together
to achieve a single high output current design.
The LTM4625 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 the RUN, TRACK/SS, FB and COMP pins
of each paralleling channel together. Figure 23 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.
4625fa
For more information www.linear.com/LTM4625
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM4625.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 |