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PDF LTM4623 Data sheet ( Hoja de datos )
| Número de pieza | LTM4623 | |
| Descripción | 3A Step-Down DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM4623 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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LTM4623
Ultrathin 20VIN, 3A Step-Down
DC/DC µModule Regulator
Features
n <2mm Height, Complete Solution in <1cm2
(Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
n Wide Input Voltage Range: 4V to 20V
n Input Voltage Down to 2.375V with External Bias
n 0.6V to 5.5V Output Voltage
n 3A DC Output Current
n ±1.5% Maximum Total DC Output Voltage Error
n Current Mode Control, Fast Transient Response
n Low EMI EN55022 Class B Compliant
n External Frequency Synchronization
n Multiphase Operation with Current Sharing
n Output Voltage Tracking
n Selectable Discontinuous Mode
n Power Good Indicator
n Overvoltage, Overcurrent and Overtemperature
Protection
n Ultrathin 6.25mm × 6.25mm × 1.82mm LGA Package
Applications
n PCIe and Backside PCB Mounting
n Telecom, Datacom, Networking and Industrial
Equipment
n Data Storage Rack Units and Cards
Description
The LTM®4623 is a complete 3A step-down switching
mode µModule (micromodule) regulator in a tiny ultrathin
6.25mm × 6.25mm× 1.82mmLGApackage.Includedinthe
package 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 LTM4623 supports an output voltage range
of 0.6V to 5.5V, set by a single external resistor. Its high
efficiency design delivers 3A continuous output current.
Only ceramic input and output capacitors are needed.
The LTM4623 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 LTM4623 is RoHS compliant with Pb free 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
3A, 1.5V Output DC/DC µModule® Step-Down Regulator
VIN
4V TO 20V
10µF
25V
0.1µF
CLKIN CLKOUT
VIN VOUT
SVIN
RUN LTM4623
INTVCC
PGOOD
MODE
COMP
PHMODE
FB
TRACK/SS
FREQ
GND SGND
VOUT
47µF
6.3V
1.5V
3A
40.2k
4623 TA01a
1.5V Output Efficiency vs Load Current
95
90
85
80
75
70
65 VIN = 5V
VIN = 12V
60
0 0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
4623 TA01b
For more information www.linear.com/LTM4623
4623f
1
1 page  
Typical Performance Characteristics
LTM4623
3.3V Output Transient Response
5V Output Transient Response
Start-Up with No Load Applied
VOUT
50mV/DIV
AC-COUPLED
VOUT
50mV/DIV
AC-COUPLED
IIN
0.5A/DIV
LOAD STEP
1A/DIV
VIN = 12V
VOUT = 3.3V
FREQ = 1MHz
20µs/DIV
4623 G10
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
LOAD STEP
1A/DIV
VIN = 12V
VOUT = 5V
FREQ = 1MHz
20µs/DIV
4623 G11
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE
FEED FORWARD CAP = 100pF
VOUT
0.5V/DIV
VIN = 12V
VOUT = 1.5V
FREQ = 1MHz
5ms/DIV
4623 G12
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
SOFT START = 0.1µF
Start-Up with 3A Load Applied
Short Circuit with No Load
Applied
Short Circuit with 3A Load
Applied
IIN
0.5A/DIV
VOUT
0.5V/DIV
VIN = 12V
VOUT = 1.5V
FREQ = 1MHz
5ms/DIV
4623 G13
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
SOFT START = 0.1µF
IIN
0.5A/DIV
VOUT
0.5V/DIV
IIN
0.5A/DIV
VOUT
0.5V/DIV
VIN = 12V
VOUT = 1.5V
FREQ = 1MHz
5ms/DIV
4623 G14
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
VIN = 12V
VOUT = 1.5V
FREQ = 1MHz
20µs/DIV
4623 G15
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
Short Circuit with 3A Load
Applied
IIN
0.5A/DIV
VOUT
0.5V/DIV
Output Ripple
VOUT
5mV/DIV
AC-COUPLED
Start into Pre-Biased Output
VIN
2V/DIV
VOUT
1V/DIV
PRE-BIASED VOUT = 2.5V
VIN = 12V
VOUT = 1.5V
FREQ = 1MHz
20µs/DIV
4623 G16
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
VIN = 12V
VOUT = 5V
FREQ = 1MHz
500ns/DIV
4623 G17
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
VIN = 12V
VOUT = 5V
FREQ = 1MHz
500ns/DIV
4623 G18
PRE-BIASED VOUT = 2.5V
INPUT CAPACITOR = 1 × 22µF CERAMIC CAP
OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP
For more information www.linear.com/LTM4623
4623f
5
5 Page 
LTM4623
Applications Information
0
CLKIN CLKOUT
+90
90
CLKIN CLKOUT
+90
180
CLKIN CLKOUT
+90
270
CLKIN CLKOUT
INTVCC/2
PHMODE
PHASE 1
INTVCC/2
PHMODE
PHASE 2
INTVCC/2
PHMODE
PHASE 3
INTVCC/2
PHMODE
PHASE 4
0
CLKIN CLKOUT
+120
120
CLKIN CLKOUT
+120
240
CLKIN CLKOUT
+180
(420)
60
CLKIN CLKOUT
+120
180
CLKIN CLKOUT
+120
PHMODE
PHASE 1
PHMODE
PHASE 3
INTVCC
PHMODE
PHASE 5
PHMODE
PHASE 2
PHMODE
PHASE 4
INTVCC
Figure 2. 4-Phase, 6-Phase Operation
300
CLKIN CLKOUT
PHMODE
PHASE 6
4623 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 FACTOR (VOUT/VIN)
4623 F03
Figure 3. RMS Input Ripple Current to DC Load Current Ratio as a Function of Duty Cycle
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 LTM4623 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 module together. Figure 26 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.
4623f
For more information www.linear.com/LTM4623
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM4623.PDF ] | |
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