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PDF LTM4633 Data sheet ( Hoja de datos )
| Número de pieza | LTM4633 | |
| Descripción | Triple 10A Step-Down DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
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LTM4633
Triple 10A Step-Down
DC/DC µModule Regulator
Features
Description
n Three Independent 10A DC Output Current Regulator
Channels
n Input Voltage Range: 4.7V to 16V
n 2.375V to 16V with External 5V Bias
n VOUT1,2 Voltage Range: 0.8V to 1.8V
n VOUT3 Voltage Range: 0.8V to 5.5V
n ±1.5% Maximum Total DC Output Error
n Current Mode Control/Fast Transient Response
n Frequency Synchronization
n Output Overvoltage and Overcurrent Protection
n Multiphase Operation with Current Sharing
on VOUT1 and VOUT2
n General Purpose Temperature Monitors
n Soft-Start/Voltage Tracking
n Power Good Monitors
n 15mm × 15mm × 5.01mm BGA Package
Applications
n Telecom, Networking and Industrial Equipment
n High Density Point of Load Regulation
The LTM®4633 µModule® (micromodule) regulator com-
bines three complete 10A switching mode DC/DC con-
verters into one small package. Included in the package
are the switching controllers, power FETs, inductors, and
most support components. The LTM4633’s three regula-
tors operate from 4.7V to 16V input rail(s) or 2.375V to
16V with an external 5V bias. The VOUT1 and VOUT2 output
range is 0.8V to 1.8V, while the VOUT3 output range is 0.8V
to 5.5V. Each output is set by one external resistor.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, multiphase parallel operation
of VOUT1 and VOUT2, soft-start and output voltage tracking
for supply rail sequencing.
Fault protection features include overvoltage protection,
overcurrent protection and temperature monitoring. The
power module is offered in a space saving, thermally
enhanced 15mm × 15mm × 5.01mm BGA package. The
LTM4633 is RoHS compliant with Pb-free finish.
L, LT, LTC, LTM, µModule, PolyPhase, Burst Mode, Linear Technology and the Linear logo are
registered trademarks and PowerPath and LTpowerCAD are 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,
6580258 and 8163643. Other patents pending.
Typical Application
12V Input to 1.0V, 1.5V and 3.3V Output Regulator
12VIN
13.3k
VIN1 VIN2
CNTL_PWR
RUN1
RUN2
RUN3
TK/SS1
TK/SS2
TK/SS3
VIN3
EXTVCC
INTVCC FREQ/PLLLPF
PGOOD12
PGOOD3
VOUT1
LTM4633
VFB1
VOUT2
VFB2
10k
242k
69.8k
MODE/PLLIN GND SGND
VOUT3
VFB3
19.1k
4633 TA01a
10k
4.7µF
6.3V
1.0V
10A
1.5V
10A
3.3V
10A
For more information www.linear.com/LTM4633
Efficiency vs Load Current
95
90
85
80
75 12VIN, 3.3V OUTPUT
12VIN, 1.5V OUTPUT
12VIN, 1V OUTPUT
70
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
4633 TA01b
4633f
1
1 page  
Typical Performance Characteristics
LTM4633
5V Input Efficiency
98
96
94
92
90
88
86
84
82
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
4633 G01
5VIN TO 3.3V (700kHz)
5VIN TO 2.5V (700kHz)
5VIN TO 1.8V (700kHz)
5VIN TO 1.5V (700kHz)
5VIN TO 1.2V (700kHz)
5VIN TO 1V (700kHz)
8V Input Efficiency
98
96
94
92
90
88
86
84
82
80
78
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
4633 G02
8VIN TO 5V (700kHz)
8VIN TO 3.3V (700kHz)
8VIN TO 2.5V (700kHz)
8VIN TO 1.8V (700kHz)
8VIN TO 1.5V (700kHz)
8VIN TO 1.2V (700kHz)
8VIN TO 1V (700kHz)
12V Input Efficiency
98
96
94
92
90
88
86
84
82
80
78
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (A)
4633 G03
12VIN TO 5V (700kHz)
12VIN TO 3.3V (700kHz)
12VIN TO 2.5V (700kHz)
12VIN TO 1.8V (700kHz)
12VIN TO 1.5V (700kHz)
12VIN TO 1.2V (700kHz)
12VIN TO 1V (700kHz)
Light Load Efficiency
90
80
70
60
50
40
30
20 12V TO 1.5V CONT MODE
12V TO 1.5V PULSE SKIP
10 12V TO 1.5V Burst Mode
OPERATION
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD CURRENT (A)
4633 G17
12V to 1.5V Load Step Response
12V to 1V Load Step Response
VOUT
50mV/DIV
IOUT
2A/DIV
40µs/DIV
4633 G04
CFF = 220pF, 0A TO 5A LOAD STEP AT 5A/µs
COUT = 2 × 100µF CERAMIC, 1 × 470µF POSCAP
12V to 1.8V Load Step Response
12V to 1.2V Load Step Response
VOUT
50mV/DIV
IOUT
2A/DIV
40µs/DIV
4633 G05
CFF = 220pF, 0A TO 5A LOAD STEP AT 5A/µs
COUT = 2 × 100µF CERAMIC, 1 × 470µF POSCAP
12V to 2.5V Load Step Response
VOUT
50mV/DIV
VOUT
50mV/DIV
VOUT
100mV/DIV
IOUT
2A/DIV
40µs/DIV
4633 G06
CFF = 220pF, 0A TO 5A LOAD STEP AT 5A/µs
COUT = 2 × 100µF CERAMIC, 1 × 470µF POSCAP
IOUT
2A/DIV
40µs/DIV
4633 G07
CFF = 220pF, 0A TO 5A LOAD STEP AT 5A/µs
COUT = 2 × 100µF CERAMIC, 1 × 470µF POSCAP
IOUT
2A/DIV
50µs/DIV
4633 G08
CFF = 100pF, 0A TO 5A LOAD STEP AT 5A/µs
COUT = 2 × 100µF CERAMIC
For more information www.linear.com/LTM4633
4633f
5
5 Page 
LTM4633
Applications Information
The typical LTM4633 application circuit is shown in Fig-
ure 16. External component selection is primarily deter-
mined by the maximum load current and output voltage.
Refer to Table 5 for specific external capacitor requirements
for particular applications.
VIN to VOUT Step-Down Ratios
There are restrictions in the VIN to VOUT step-down ratio
that can be achieved for a given input voltage. The VIN to
VOUT minimum dropout is a function of load current and
at very low input voltage and high duty cycle applications
output power may be limited as the internal top power
MOSFET is not rated for 10A operation at higher ambient
temperatures. At very low duty cycles the minimum 90ns
on-time must be maintained. See the Frequency Adjust-
ment section and temperature derating curves.
Output Voltage Programming
The PWM controller has an internal 0.8V ±1% reference
voltage. As shown in the Block Diagram, a 60.4k preci-
sion internal feedback resistor connects the VOUT and VFB
pins together.
The output voltage will default to 0.8V with no feedback
resistor. Adding a resistor RFB from VFB to ground pro-
grams the output voltage:
VOUT
=
0.8V
•
60.4k +RFB
RFB
,
RFB
=
48.32k
VOUT – 0.8V
Table 1. VFB Resistor Table vs Various Output Voltages
VOUT(V) 0.8 1.0 1.2 1.5 1.8 2.5 3.3
RFB (kΩ) Open 242 121 69.8 48.7 28.7 19.1
5.0
11.5
For parallel operation of VOUT1 and VOUT2, the following
equation can be used to solve for RFB:
60.4k
RFB
=
2
VOUT
0.8V
–1
In the parallel operation the following pins should be tied
together, VFB1 and VFB2 pins, COMP1 and COMP2 pins,
TK/SS1 and TK/SS2, and RUN1 and RUN2.
Input Capacitors
The LTM4633 module should be connected to a low AC
impedance DC source. Additional input capacitors are
needed for the RMS input ripple current rating. The ICIN(RMS)
equation which follows can be used to calculate the input
capacitor requirement for each channel. Typically 22µF
X7R ceramics are a good choice with RMS ripple current
ratings of ~2A each. A 47µF to 100µF surface mount alu-
minum electrolytic capacitor can be used for more input
bulk capacitance. This bulk input capacitor is only needed
if the input source impedance is compromised by long
inductive leads, traces or not enough source capacitance.
If low impedance power planes are used, then this bulk
capacitor is not needed.
For a buck converter, the switching duty cycle can be
estimated as:
D=
VOUT
VIN
Without considering the inductor ripple current, for each
output, the RMS current of the input capacitor can be
estimated as:
ICIN(RMS)
=
IOUT(MAX )
η%
•
D • (1– D)
(1)
In the previous equation, η% is the estimated efficiency
of the power module in decimal form (0.nn) for a given
VOUT-to-VIN ratio.
The selection of CIN is simplified by the 3-phase architec-
ture and its impact on the worst-case RMS current draw
occurs when only one channel is operating. This is true
when the three channels are powered from a common
VIN. The channel with the highest duty cycle D peaking at
0.5 and maximum load current needs to be used in the
For more information www.linear.com/LTM4633
4633f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4633.PDF ] | |
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