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PDF LTM4600HV Data sheet ( Hoja de datos )
| Número de pieza | LTM4600HV | |
| Descripción | High Efficiency DC/DC uModule | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4600HV
10A, 28VIN High Efficiency
DC/DC µModule
Features
n Complete Switch Mode Power Supply
n Wide Input Voltage Range: 4.5V to 28V
n 10A DC, 12A Peak Output Current
n Parallel Two µModule™ DC/DC Converters for 20A
Output Current
n 0.6V to 5V Output Voltage
n 1.5% Output Voltage Regulation
n Ultrafast Transient Response
n Current Mode Control
n –55°C to 125°C Operating Temperature Range
(LTM4600HVMPV)
n RoHS Compliant Package with Gold Pad Finish (e4)
n Up to 92% Efficiency
n Programmable Soft-Start
n Output Overvoltage Protection
n Optional Short-Circuit Shutdown Timer
n Small Footprint, Low Profile (15mm × 15mm ×
2.82mm) LGA Package
Applications
n Telecom and Networking Equipment
n Military and Avionics Systems
n Industrial Equipment
n Point of Load Regulation
n Servers
Description
The LTM®4600HV is a complete 10A, DC/DC step down
power supply with up to 28V input operation. Included
in the package are the switching controller, power FETs,
inductor, and all support components. Operating over
an input voltage range of 4.5V to 28V, the LTM4600HV
supports an output voltage range of 0.6V to 5V, set by a
single resistor. This high efficiency design delivers 10A
continuous current (12A peak), needing no heat sinks or
airflow to meet power specifications. Only bulk input and
output capacitors are needed to finish the design.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. High switching frequency and an
adaptive on-time current mode architecture enables a very
fast transient response to line and load changes without
sacrificing stability. Fault protection features include
integrated overvoltage and short circuit protection with
a defeatable shutdown timer. A built-in soft-start timer is
adjustable with a small capacitor.
The LTM4600HV is packaged in a compact (15mm ×
15mm) and low profile (2.82mm) over-molded Land Grid
Array (LGA) package suitable for automated assembly by
standard surface mount equipment. The LTM4600HV is
RoHS compliant.
L, LT, LTC, LTM, µModule and OPTI-LOOP are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Typical Application
10A µModule Power Supply with 4.5V to 28V Input
Efficiency vs Load Current with 24VIN (FCB = 0)
100
90
VIN
4.5V TO 28V
ABSMAX
VIN VOUT
CIN LTM4600HV COUT
VOUT
2.5V*
10A
VOSET
PGND SGND
31.6k
4600hv TA01a
*REVIEW DE-RATING CURVE AT
THE HIGHER INPUT VOLTAGE
80
70
60
50
40
30
0
1.8VOUT
2.5VOUT
3.3VOUT
5VOUT
2468
LOAD CURRENT (A)
10
4600HV TA01b
For more information www.linear.com/LTM4600HV
4600hvfe
1
1 page  
LTM4600HV
Typical Performance Characteristics (See Figure 21 for all curves)
Efficiency vs Load Current
with 5VIN (FCB = 0)
100
90
80
70
60
50
0.6VOUT
40
1.2VOUT
1.5VOUT
30 2.5VOUT
0 2 4 6 8 10
LOAD CURRENT (A)
4600hv G01
Efficiency vs Load Current
with Different FCB Settings
90
80 FCB > 0.7V
70
60
FCB = GND
50
40
30
20
0.1
VIN = 12V
VOUT = 1.5V
1
LOAD CURRENT (A)
10
4600hv G04
Efficiency vs Load Current
with 12VIN (FCB = 0)
100
90
80
70
60
50
40
30
0
0.6VOUT
1.2VOUT
1.5VOUT
2.5VOUT
3.3VOUT
2468
LOAD CURRENT (A)
10
4600hv G02
1.2V Transient Response
VOUT = 50mV/DIV
IOUT = 5A/DIV
25µs/DIV
1.2V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G05
Efficiency vs Load Current
with 24VIN (FCB = 0)
100
90
80
70
60
50 1.8VOUT
40
2.5VOUT
3.3VOUT
30 5VOUT
0 2 4 6 8 10
LOAD CURRENT (A)
4600hv G03
1.5V Transient Response
25µs/DIV
1.5V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G06
1.8V Transient Response
2.5V Transient Response
3.3V Transient Response
25µs/DIV
1.8V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G07
25µs/DIV
2.5V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G08
For more information www.linear.com/LTM4600HV
25µs/DIV
3.3V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G09
4600hvfe
5
5 Page 
LTM4600HV
applications information
in the PCB layout to minimize the trace inductance and
high frequency AC noise.
Output Capacitors
The LTM4600HV is designed for low output voltage ripple.
The bulk output capacitors COUT is chosen with low enough
effective series resistance (ESR) to meet the output voltage
ripple and transient requirements. COUT can be low ESR
tantalum capacitor, low ESR polymer capacitor or ceramic
capacitor (X5R or X7R). The typical capacitance is 200µF
if all ceramic output capacitors are used. The internally
optimized loop compensation provides sufficient stability
margin for all ceramic capacitors applications. Additional
output filtering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spike is required. Refer to Table 2 for an output capaci-
tance matrix for each output voltage droop, peak to peak
deviation and recovery time during a 5A/µs transient with
a specific output capacitance.
Fault Conditions: Current Limit and Over current
Foldback
The LTM4600HV has a current mode controller, which
inherently limits the cycle-by-cycle inductor current not
only in steady state operation, but also in transient.
To further limit current in the event of an over load condition,
the LTM4600HV provides foldback current limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN to VOUT step
down ratio that can be achieved for a given input voltage.
These constraints are shown in VIN to VOUT Step-Down
Ratio in the Typical Performance Characteristics section.
Note that additional thermal derating may apply. See the
Thermal Considerations and Output Current Derating sec-
tions of this data sheet.
Soft-Start and Latchoff with the RUN/SS pin
The RUN/SS pin provides a means to shut down the
LTM4600HV as well as a timer for soft-start and over-
current latchoff. Pulling the RUN/SS pin below 0.8V puts
the LTM4600HV into a low quiescent current shutdown
(IQ ≤ 75µA). Releasing the pin allows an internal 1.2µA
current source to charge up the timing capacitor CSS.
Inside LTM4600HV, there is an internal 1000pF capacitor
from RUN/SS pin to ground. If RUN/SS pin has an external
capacitor CSS_EXT to ground, the delay before starting is
about:
tDELAY
=
1.5V
1.2µA
• (CSS _EXT
+ 1000pF)
When the voltage on RUN/SS pin reaches 1.5V, the
LTM4600HV internal switches are operating with a clamp-
ing of the maximum output inductor current limited by
the RUN/SS pin total soft-start capacitance. As the RUN/
SS pin voltage rises to 3V, the soft-start clamping of the
inductor current is released.
For more information www.linear.com/LTM4600HV
4600hvfe
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTM4600HV.PDF ] | |
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