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PDF LTM4630A Data sheet ( Hoja de datos )
| Número de pieza | LTM4630A | |
| Descripción | Dual 18A or Single 36A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4630A
Dual 18A or Single 36A
DC/DC µModule Regulator
Features
n Dual 18A or Single 36A Output
n Input Voltage Range: 4.5V to 15V
n Output Voltage Range: 0.6V to 5.3V
n ±1.5% Maximum Total DC Output Error Over Line,
Load and Temperature
n Higher Light Load Efficiency and Wider VOUT Range
Than LTM4630
n Differential Remote Sense Amplifier
n Current Mode Control/Fast Transient Response
n Multiphase Parallel Current Sharing Up to 144A
n Internal Temperature Monitor
n Pin Compatible with the LTM4620A (Dual 13A,
Single 26A) and LTM4630 (Dual 18A, Single 36A)
n Adjustable Switching Frequency or Synchronization
n Overcurrent Foldback Protection
n Selectable Burst Mode® Operation, Pulse Skipping
Mode Operation
n Soft-Start/Voltage Tracking
n Output Overvoltage Protection
n 16mm × 16mm × 4.41mm LGA Package
Applications
n Telecom and Networking Equipment
n Storage and ATCA Cards
n Industrial Equipment
Description
The LTM®4630A is a dual 18A or single 36A output switch-
ing mode step-down DC/DC µModule® (micromodule)
regulator with wider VOUT range and higher efficiency
than LTM4630. Included in the package are the switch-
ing controllers, power FETs, inductors and all supporting
components. Operating from an input voltage range of
4.5V to 15V, the LTM4630A supports two outputs each
with an output voltage range of 0.6V to 5.3V, each set by a
single external resistor. Its high efficiency design delivers
up to 18A continuous current for each output. Only a few
input and output capacitors are needed. The LTM4630A
is pin compatible with the LTM4620 and LTM4620A (dual
13A, single 26A) and the LTM4630 (dual 18A, single 36A).
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring. High
switching frequency and a current mode architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include overvoltage and
overcurrent protection. The LTM4630A is offered in 16mm
× 16mm × 4.41mm LGA package.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks 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
INTVCC
4.7µF
VIN
4.5V TO 15V
22µF
25V 120k
×4
0.1µF
PINS UNUSED IN
THIS APPLICATION:
CLKOUT
EXTVCC
SW1
SW2
VOUTS2
75k
10k
PGOOD
INTVCC
VIN
TEMP
TRACK1
TRACK2
fSET
RUN1
RUN2
PHASMD
SGND
PGOOD1
LTM4630A
PGOOD2
VOUT1
VOUTS1
DIFFOUT
VFB1
VFB2
COMP1
COMP2
VOUT2
DIFFP
DIFFN
GND MODE_PLLIN
4630A TA01a
100µF +
6.3V
60.4k
100µF
6.3V
470µF
6.3V
+
VOUT
470µF
6.3V
For more information www.linear.com/LTM4630A
1E.ff2iVciOeUnTcyanvds 3IO.U3TVOUT
100
95
90
85
80
75 12 VIN, 1.2VOUT, 300kHz
70
12 VIN, 3.3VOUT, 600kHz
5 VIN, 1.2VOUT, 300kHz
5 VIN, 3.3VOUT, 500kHz
65
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630A TA01b
4630af
1
1 page  
Electrical Characteristics
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 LTM4630A is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4630AE 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
LTM4630AI 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.
LTM4630A
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 300kHz to 750kHz.
Note 5: LTM4630A device is designed to operate from 300kHz to 750kHz
Note 6: These parameters are tested at wafer sort.
Note 7: See Table 1 for Peak Current and Thermal Design Power (TDP)
current for different VIN and VOUT. See output current derating curve for
different ambient temperature.
Typical Performance Characteristics
Efficiency vs Output Current,
VIN = 5V
100
98
96
94
92
90
88
86
84
82 0.9VOUT, 300kHz
80
78
76
74
72
70
1.0VOUT, 300kHz
1.2VOUT, 300kHz
1.5VOUT, 300kHz
1.8VOUT, 300kHz
23..53VVOOUUTT,,
400kHz
500kHz
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630A G01
Efficiency vs Output Current,
VIN = 12V
100
98
96
94
92
90
88
86
84 0.9VOUT, 300kHz
82 1.0VOUT, 300kHz
80 1.2VOUT, 300kHz
78
76
74
72
70
1.5VOUT, 400kHz
1.8VOUT, 400kHz
235..V53OVVUOOTUU, TT7,,056000k00HkkzHHzz
0 2 4 6 8 10 12 14 16
LOAD CURRENT (A)
18
4630A G02
Burst Mode and Pulse-Skip Mode
fESff=ic3ie0n0ckyHVzIN=12V, VOUT = 1.2V,
95
90
Burst Mode OPERATION
85 PULSE-SKIP MODE
80
75
CCM
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0.01 0.1 1 10
LOAD CURRENT (A)
4630A G04
1V Dual Phase Single Output
Load Transient Response
1.2V Dual Phase Single Output
Load Transient Response
VOUT(AC)
20mV/DIV
LOAD STEP
10A/DIV
50µs/DIV
4630A G05
12VIN, 1VOUT, 300kHz, DUAL PHASE SINGLE
OUTPUT SETUP 9A LOAD STEP UP AND STEP
DOWN, 9A/µs SLEW RATE COUT = 2 • 220µF
POSCAP + 4 • 100µF CERAMIC CAPS
VOUT(AC)
20mV/DIV
LOAD STEP
10A/DIV
50µs/DIV
4630A G06
12VIN, 1.2VOUT, 300kHz, DUAL PHASE SINGLE
OUTPUT SETUP 9A LOAD STEP UP AND STEP
DOWN, 9A/µs SLEW RATE COUT = 2 • 220µF
POSCAP + 4 • 100µF CERAMIC CAPS
For more information www.linear.com/LTM4630A
4630af
5
5 Page 
LTM4630A
Applications Information
The typical LTM4630A application circuit is shown in
Figure 31. External component selection is primarily
determined by the maximum load current and output
voltage. Refer to Table 6 for specific external capacitor
requirements for particular applications.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN and VOUT step-
down ratio that can be achieved for a given input voltage.
Each output of the LTM4630A is capable of 98% duty
cycle, but the VIN to VOUT minimum dropout is still shown
as a function of its load current and will limit output cur-
rent capability related to high duty cycle on the top side
switch. Minimum on-time tON(MIN) is another consideration
in operating at a specified duty cycle while operating at
a certain frequency due to the fact that tON(MIN) < D/fSW,
where D is duty cycle and fSW is the switching frequency.
tON(MIN) is specified in the electrical parameters as 90ns.
Output Voltage Programming
The PWM controller has an internal 0.6V reference voltage.
As shown in the Block Diagram, a 60.4kΩ internal feedback
resistor connects between the VOUTS1 to VFB1 and VOUTS2
to VFB2. It is very important that these pins be connected
to their respective outputs for proper feedback regulation.
Overvoltage can occur if these VOUTS1 and VOUTS2 pins are
left floating when used as individual regulators, or at least
one of them is used in paralleled regulators. The output
voltage will default to 0.6V with no feedback resistor on
either VFB1 or VFB2. Adding a resistor RFB from VFB pin to
GND programs the output voltage:
VOUT
=
0.6V
•
60.4k +RFB
RFB
For parallel operation of multiple channels the same feed-
back setting resistor can be used for the parallel design.
This is done by connecting the VOUTS1 to the output as
shown in Figure 2, thus tying one of the internal 60.4k
resistors to the output. All of the VFB pins tie together with
one programming resistor as shown in Figure 2.
COMP1 LTM4630A
COMP2
VOUT1
VOUT2
TRACK1
TRACK2
60.4k
60.4k
VOUTS1
VOUTS2
VFB1
VFB2
0.1µF
COMP1 LTM4630A
COMP2
VOUT1
VOUT2
TRACK1
TRACK2
60.4k
60.4k
VOUTS1
VOUTS2
VFB1
VFB2
4630A F02
4 PARALLELED OUTPUTS
FOR 1.2V AT 70A
OPTIONAL CONNECTION
OPTIONAL
RFB
60.4k
USE TO LOWER
TOTAL EQUIVALENT
RESISTANCE TO LOWER
IFB VOLTAGE ERROR
RFB
60.4k
Figure 2. 4-Phase Parallel Configurations
Table 1. FREQ Resistor, VFB Resistor, Output Current vs Various Output Voltages
VOUT
0.9V 1V 1.2V
1.5V
1.8V
RFB
121k 90.9k 60.4k
40.2k
30.2k
VIN
4.5V to 4.5V to 4.5V to 4.5V to 10V to 4.5V to 10V to
15V 15V 15V 9V 15V 9V 15V
2.5V
19.1k
4.5V to 10V to
9V 15V
3.3V
13.3k
4.5V to 10V to
9V 15V
5V
8.25k
7V to 10V to
9V 15V
FREQ
300kHz 300kHz 300kHz 300kHz 400kHz 300kHz 400kHz 400kHz 500kHz 500kHz 600kHz 600kHz 700kHz
RFREQ
Peak Output Current
75k 75k 75k 75k 90.9k 75k 90.9k 90.9k 121k 121k 140k 140k 162k
18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A
TDP Output Current (0 LFM) 18A 18A 18A 18A 16A 18A 16A 17A 15A 16A 14A 15A 13A
TDP Output Current
(200LFM or 400LPM)
18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A 18A
*TDP is Thermal Design Power at no airflow and no heat sink. Any design beyond TDP current may consider airflow or heat sink. See Current Derating
curve for different TA and airflow.
For more information www.linear.com/LTM4630A
4630af
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4630A.PDF ] | |
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