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PDF LTM4624 Data sheet ( Hoja de datos )
| Número de pieza | LTM4624 | |
| Descripción | 4A Step-Down DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM4624 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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LTM4624
14VIN, 4A Step-Down DC/DC
µModule Regulator
Features
n Complete Solution in <1cm2 (Single-Sided PCB) or
0.5cm2 (Dual-Sided PCB)
n Wide Input Voltage Range: 4V to 14V
n Input Voltage Down to 2.375V with External Bias
n 0.6V to 5.5V Output Voltage
n 4A DC, 5A Peak Output Current
n ±2% Total DC Output Voltage Error
n Current Mode Control, Fast Transient Response
n Output Voltage Tracking
n Selectable Discontinuous Mode
n Power Good Indicator
n Overvoltage, Overcurrent and Overtemperature
Protection
n 6.25mm × 6.25mm × 5.01mm BGA Package
Applications
n Telecom, Datacom, Networking and Industrial
Equipment
n Medical Diagnostic Equipment
n Data Storage Rack Units and Cards
n Test and Debug Systems
Description
The LTM®4624 is a complete 4A step-down switching mode
µModule® (micromodule) regulator in a tiny 6.25mm ×
6.25mm × 5.01mm BGA package. Included in the package
are the switching controller, power FETs, inductor and sup-
port components. Operating over an input voltage range of
4V to 14V or 2.375V to 14V with an external bias supply,
the LTM4624 supports an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers 4A continuous, 5A peak, output current.
Only bulk input and output capacitors are needed.
The LTM4624 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 LTM4624 is available with SnPb (BGA) 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.
Click to view associated TechClip Videos.
Typical Application
4A, 1.5V Output DC/DC µModule Step-Down Regulator
VIN
4V TO 14V
10µF
16V
0.1µF
VIN VOUT
SVIN
RUN LTM4624
INTVCC
PGOOD
MODE
COMP
TRACK/SS
FB
FREQ
GND SGND
VOUT
47µF
6.3V
1.5V
4A
40.2k
4624 TA01a
12VIN Efficiency vs Load Current
100
95
90
85
80
75
70 VOUT = 5V
65 VOUT = 3.3V
60
VOUT = 2.5V
VOUT = 1.5V
55
VOUT = 1.2V
VOUT = 1V
50
0 12 34
LOAD CURRENT (A)
4624 TA01b
For more information www.linear.com/LTM4624
4624fc
1
1 page  
Typical Performance Characteristics
Start-Up with No Load
Start-Up with 4A Load
LTM4624
Short-Circuit with No Load
IIN
0.1A/DIV
VOUT
0.5V/DIV
IIN
0.2A/DIV
VOUT
0.5V/DIV
IIN
0.5A/DIV
VOUT
0.5V/DIV
VIN = 12V
5ms/DIV
4624 G09
VOUT = 1.5V
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
VIN = 12V
5ms/DIV
4624 G10
VOUT = 1.5V
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
VIN = 12V
20µs/DIV
4624 G11
VOUT = 1.5V
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Short-Circuit with 4A Load
Recovery to No Load
from Short Circuit
Output Ripple
IIN
0.5A/DIV
VOUT
0.5V/DIV
VOUT
200mV/DIV
IOUT
20A/DIV
5mV/DIV
AC-COUPLED
VIN = 12V
20µs/DIV
4624 G12
VOUT = 1.5V
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
VIN = 12V
5µs/DIV
4624 G13
VOUT = 1V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 2× 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
VIN = 12V
500µs/DIV
4624 G14
VOUT = 1.5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC
CAPACITOR
OUTPUT CAPACITOR = 2× 47µF CERAMIC
CAPACITOR
SOFT-START CAPACITOR = 0.1µF
Start Into Pre-Bias Output
VIN
2V/DIV
VOUT
1V/DIV
12V Input to 1.8V Output,
50% Load Transient Response
VOUT
100mV/DIV
AC-COUPLED
LOAD STEP
2A/DIV
5V Input to 1.2V Output,
50% Load Transient Response
VOUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
VIN = 12V
1µs/DIV
4624 G15
VOUT = 5V
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 2× 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
VIN = 12V
50µs/DIV
4624 G16
VOUT = 1.8V
IOUT = 2A TO 4A, 1A/µs
OUTPUT CAPACITOR = 1× 47µF CERAMIC
VIN = 5V
50µs/DIV
4624 G17
VOUT = 1.2V
IOUT = 2A TO 4A, 1A/µs
OUTPUT CAPACITOR = 1× 47µF CERAMIC
For more information www.linear.com/LTM4624
4624fc
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5 Page 
LTM4624
Applications Information
Output voltage tracking can also be programmed externally
using the TRACK/SS pin. The output can be tracked up
and down with another regulator. Figure 2 and Figure 3
show an example waveform and schematic of ratiometric
tracking where the slave regulator’s output slew rate is
proportional to the master’s.
Since the slave regulator’s TRACK/SS is connected to
the master’s output through a RTR(TOP)/RTR(BOT) resistor
divider and its voltage used to regulate the slave output
voltage when TRACK/SS voltage is below 0.6V, the slave
MASTER OUTPUT
SLAVE OUTPUT
TIME
4624 F02
Figure 2. Output Ratiometric Tracking Waveform
VIN
4V TO 15V
10µF
16V
FREQ
VIN VOUT
SVIN
RUN LTM4624
INTVCC
MODE
TRACK/SS
FB
PGOOD
COMP
GND SGND
47µF
6.3V
VOUT(MA)
1.5V
4A
RFB(MA)
40.2k
RTR(TOP)
60.4k
RTR(BOT)
40.2k
10µF
16V
FREQ
VIN
SVIN
RUN
LTM4624
VOUT
INTVCC
MODE
TRACK/SS
FB
PGOOD
COMP
GND SGND
47µF
6.3V
VOUT(SL)
1.2V
4A
RFB(SL)
60.4k
4624 F03
Figure 3. Example Schematic of Ratiometric Output Voltage Tracking
For more information www.linear.com/LTM4624
4624fc
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11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM4624.PDF ] | |
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