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PDF LTM4630-1 Data sheet ( Hoja de datos )
| Número de pieza | LTM4630-1 | |
| Descripción | Dual 18A or Single 36A uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4630-1
Dual 18A or Single 36A
µModule Regulator with
0.8% DC and 3% Transient Accuracy
FEATURES
nn ±0.8% Maximum Total DC Output Error Over Line,
Load and Temperature (LTM4630-1A)
nn ±3% Transient Output Error with Minimum Output
Capacitance
nn Dual 18A or Single 36A Output
nn 4.5V to 15V Input, 0.6V to 1.8V Output Voltage Range
nn Differential Remote Sense Amplifier
nn Current Mode Control/Fast Transient Response
nn Current Sharing Up to 144A
nn 16mm × 16mm × 5.01mm BGA Package
APPLICATIONS
nn FPGA, ASIC, µProcessor Core Voltage Regulation
nn Information, Communication Systems
DESCRIPTION
The LTM®4630-1A/LTM4630-1B are dual 18A or single 36A
output step-down µModule® (micromodule) regulators with
±0.8% (LTM4630-1A) and ±1.5% (LTM4630-1B) total DC
output error, respectively, with ±3% transient output error.
Included in the package are the switching controller, power
FETs,inductors,andallsupportingcomponents.Externalcom-
pensationallowsforfasttransientresponsetominimizeoutput
capacitance when powering FPGAs, ASICs, and processors.
With synchronized multiphase parallel current sharing, four
LTM4630-1 devices can deliver up to 144A. The LTM4630-1
is offered in a 16mm × 16mm × 5.01 BGA package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066 and 6580258.
Other patents pending.
TYPICAL APPLICATION
36A, 1.2V Output DC/DC µModule Regulator
VIN
4.5V TO 15V
22µF
25V
×4
0.1µF
121k
INTVCC
4.7µF
10k
PGOOD
121k
3.75k
2200pF
CLKOUT INTVCC EXTVCC PGOOD2 PGOOD1
VIN VOUT1
TEMP
VOUT2
RUN1
DIFFP
RUN2
DIFFN
TRACK1
TRACK2
LTM4630-1
DIFFOUT
VOUTS1
fSET
PHASMD
COMP1
COMP2
VOUTS2
VFB1
VFB2
SGND GND MODE_PLLIN
46301 TA01a
220µF
4V
×5
VOUT
1.2V
36A
33pF
60.4k
1.2V Output Efficiency, fSW = 500kHz
95
VIN = 5V
90
85 VIN = 12V
80
75
70
65
0 4 8 12 16 20 24 28 32 36
OUTPUT CURRENT (A)
46301 TA01b
25% Load Step Transient Response, ±3% Output Regulation Window. 12VIN, 1.2VOUT, 36A with 5x 220μF Ceramic Cap
VOUT
20mV/DIV
AC-COUPLED
LOAD STEP
4A/DIV
65mV
50µs/DIV
9A STEP
46301 TA01c
*SEE DEMO CIRCUIT
DC2081A-B
For more information www.linear.com/LTM4630-1
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1 page  
LTM4630-1
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output
unless otherwise noted. Per the typical application in Figure 25.
channel.
TA
=
25°C
(Note
2),
VIN
=
12V
and
VRUN1,
VRUN2
at
5V
SYMBOL
PARAMETER
Differential Amplifier
AV Differential
Amplifier
Gain
RIN
VOS
PSRR Differential
Amplifier
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
ICL
VOUT(MAX)
GBW
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
VTEMP
TC
Diode Connected PNP
Temperature Coefficient
CONDITIONS
Measured at DIFFP Input
VDIFFP = VDIFFOUT = 1.5V, IDIFFOUT = 100µA
5V < VIN < 15V
IDIFFOUT = 300µA
I = 100µA
MIN TYP MAX UNITS
1 V/V
80
3
90
kΩ
mV
dB
INTVCC – 1.4
l
3
3
0.6
–2.2
mA
V
MHz
V
mV/C
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTM4630-1 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4630E-1 is guaranteed to meet specifications from
0°C to 125°C internal temperature. Specifications over the –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM4630I-1 is guaranteed over the full –40°C to 125°C internal operating
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4: The switching frequency is programmable from 400kHz to 750kHz.
Note 5: LTM4630-1 device is designed to operate from 400kHz to 750kHz
Note 6: These parameters are tested at wafer sort.
Note 7: See output current derating curves for different VIN, VOUT and TA.
For more information www.linear.com/LTM4630-1
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5 Page 
LTM4630-1
OPERATION
Power Module Description
The LTM4630-1 is a dual-output standalone nonisolated
switching mode DC/DC power supply with ±0.8% total DC
output error over line, load and temperature variation. It
can provide two 18A outputs or single 36A output with
few external input and output capacitors and setup com-
ponents. This module provides precisely regulated output
voltages programmable via external resistors from 0.6VDC
to 1.8VDC over 4.5V to 15V input voltages. The typical
application schematic is shown in Figure 25.
The LTM4630-1 has dual integrated constant-frequency
current mode regulators and built-in power MOSFET
devices with fast switching speed. The typical switching
frequency is 500kHz. For switching-noise sensitive ap-
plications, it can be externally synchronized from 400kHz
to 780kHz. A resistor can be used to program a free run
frequency on the FSET pin. See the Applications Informa-
tion section.
With current mode control, multi LTM4630-1s can be easily
paralleled to provide up to 144A current with guaranteed
perfect current sharing. Also, with current mode control,
the LTM4630-1 module is able to achieve sufficient stability
margins and a very fast ±3% output transient response
with a minimum number of output capacitors, even with
all ceramic output capacitors.
This makes LTM4630-1 the best candidate when powering
FPGAs, ASICs and processors in terms of DC accuracy,
AC transient response, high output current and accuracy
current sharing. See Applications Information section.
Current mode control provides cycle-by-cycle fast current
limit and foldback current limit in an overcurrent condition.
Internal overvoltage and undervoltage comparators pull
the open-drain PGOOD outputs low if the output feedback
voltage exits a ±10% window around the regulation point.
As the output voltage exceeds 10% above regulation, the
bottom MOSFET will turn on to clamp the output voltage.
The top MOSFET will be turned off. This overvoltage protect
is feedback voltage referred.
Pulling the RUN pins below 1.1V forces the regulators into
a shutdown state, by turning off both MOSFETs. The TRACK
pins are used for programming the output voltage ramp and
voltage tracking during start-up or used for soft-starting
the regulator. See the Applications Information section.
The LTM4630-1 has a built-in 10pF high frequency filter
cap from COMP to SGND for each output. An external RC
filtering circuit is required to achieve fast Type II control
loop compensation. Table 4 provides a guide line for input,
output capacitances and RC comp values for several oper-
ating conditions. The Linear Technology µModule Power
Design Tool (LTpowerCAD™) will be provided for transient
and stability analysis. The VFB pin is used to program the
output voltage with a single external resistor to ground.
A differential remote sense amplifier is available for sens-
ing the output voltage accurately on one of the outputs at
the load point, or in parallel operation sensing the output
voltage at the load point.
High efficiency at light loads can be accomplished with
selectable Burst Mode operation or pulse-skipping
operation using the MODE_PLLIN pin. These light load
features will accommodate battery operation. Efficiency
graphs are provided for light load operation in the Typical
Performance Characteristics section. See the Applications
Information section for details.
A general purpose temperature diode is included inside
the module to monitor the temperature of the module. See
the Applications Information section for details.
The switch pins are available for functional operation
monitoring and a resistor-capacitor snubber circuit can
be careful placed on the switch pin to ground to dampen
any high frequency ringing on the transition edges. See
the Applications Information section for details.
For more information www.linear.com/LTM4630-1
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4630-1.PDF ] | |
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