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PDF LTM4636-1 Data sheet ( Hoja de datos )
| Número de pieza | LTM4636-1 | |
| Descripción | 40A uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4636-1
40A µModule Regulator
with Overvoltage/
Overtemperature Protection
Features
Description
nn Overtemperature, Input/Output Overvoltage
Protection
nn Trips Upstream Power Source or Circuit Breaker
nn Stacked Inductor Acts as Heat Sink
nn Wide Input Voltage Range: 4.7V to 15V
nn 0.6V to 3.3V Output Voltage Range
nn ±1.3% Total DC Output Voltage Error (–40°C to 125°C)
nn Differential Remote Sense Amplifier for Precision
Regulation
nn Current Mode Control/Fast Transient Response
nn Frequency Synchronization
nn Parallel Current Sharing (Up to 240A)
nn 88% Efficiency (12VIN, 1VOUT) at 40A
nn Overcurrent Foldback Protection
nn Overtemperature Shutdown
nn 16mm × 16mm × 7.07mm BGA Package
Applications
The LTM®4636-1 is a 40A step-down µModule® (power
module) switching regulator with stacked inductor as a
heat sink for heat dissipation and cooler operation in a
small package. The LTM4636-1 detects overtemperature
and input/output overvoltage conditions and can trip an up-
stream power supply or circuit breaker to protect itself and
its load. The exposed inductor as a heat sink permits direct
contact with airflow from any direction. The LTM4636-1
can deliver 40W (12VIN, 1VOUT, 40A, 200LFM) with only
40°C rise over the ambient temperature. Full-power 40W
is delivered up to 83°C ambient and half-power 20W is
supported at 110°C ambient.
The LTM4636-1 operates at 92%, 90% and 88% efficiency
delivering 15A, 30A and 40A, respectively, to a 1V load
(12VIN). The µModule regulator is scalable where four
in current sharing deliver 160W with only 40°C rise and
88% efficiency (12VIN, 1VOUT, 400LFM). The LTM4636-1
is offered in 16mm × 16mm × 7.07mm BGA package.
nn Telecom Servers and Networking Equipment
nn Industrial Equipment and Medical Systems
L, LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology, the Linear logo are
registered trademarks 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, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210, 8163643.
Typical Application
1V, 40A DC/DC µModule Regulator
UPSTREAM
BIAS
4.5V TO 5.5V RANGE
BIAS
VSYS
4.7V
TO
15V
REGULATOR
HOT SWAP
CIRCUIT
BREAKER
VIN ≤ 5.5V, TIE VIN AND PVCC
TOGETHER, TIE RUNP TO GND.
VIN > 5.5V, THEN OPERATE AS SHOWN
+
100µF
25V
22µF
16V
×5
0.1µF
PVCC
15k
VIN
RUNC
RUNP
INTVCC
INTVCC
PVCC
BIAS PVCC
OTP_SET
OVP_SET
61.9k
22µF 86.6k
OPTIONAL CROWBAR
INTVCC HIZREG
CROWBAR
OPTIONAL OVERTEMPERATURE
AND OVERVOLTAGE FAULT SIGNAL
OVER_TEMP
OVP_TRIP
0.01µF 100k
34.8k
PINS NOT USED IN THIS CIRCUIT:
CLKOUT, GMON, PGOOD, PHMODE, PWM,
FREQ LTM4636-1
TRACK/SS
MODE/PLLIN
SNSP1
SNSP2
COMPA
COMPB
VOUT
VOUTS1+
VOUTS1–
VFB
1V
+ 470µF
6.3V
×3
SW, TEST1, TEST2, TEST3, TMON
TEMP+ TEMP– SGND PGND
7.5k
OPTIONAL TEMP MONITOR
46361 TA01a
See the LTM4636 for simpler circuit and fewer features.
VOUT
1V, 40A
100µF
6.3V
×4
For more information www.linear.com/LTM4636-1
1325V0IkNH,z1vVsOOUTutEpfufitcCieunrcreynatt
100
95
90
85
80
75
70
0
5 10 15 20 25 30 35 40
OUTPUT CURRENT (A) 46361 TA01b
46361f
1
1 page  
LTM4636-1
E lectrical Characteristics The l denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 12V, per the typical application in Figure 20.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
VPHSMD = 0V
RRFFRREEQQ
=
=
30.1kΩ
47.5kΩ
RFREQ = 54.9kΩ
RFREQ = 75.0kΩ
Maximum Frequency
Minimum Frequency
210
540
625
945
l 1.2
l
250 290
600 660
750 825
1.05 1.155
0.2
kHz
kHz
kHz
MHz
MHz
MHz
IFREQ
RMODE/PLLIN
FREQ Pin Output Current
MODE_PLLIN Input
Resistance
VFREQ = 0.8V
19 20 21
250
µA
kΩ
VMODE/PLLIN
VCLKOUT
PLLIN Input Threshold
Low Output Voltage
High Output Voltage
VMODE/PLLIN Rising
VMODE/PLLIN Falling
Verified Levels
Measurements on CLKOUT
2V
1.2 V
0.2 V
5.2 V
PWM-CLKOUT
PWM to Clockout Phase Delay
PWM/PWMEN Outputs
VPHMODE = 0V
VVPPHHMMOODDEE
=
=
1Fl/o4aItNTVCC
VPHMODE = 3/4 INTVCC
VPHMODE = INTVCC
90 Deg
90 Deg
120 Deg
60 Deg
180 Deg
PWM
PWM Output High Voltage
PWM Output Low Voltage
Temperature Diode
Diode VF
TC
Diode Forward Voltage
Temperature Coefficient
ILOAD = 500µA
ILOAD = –500µA
I = 100µA, TEMP+ to TEMP–
5.0 V
0.5 V
0.598
l –2.0
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 LTM4636-1 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4636-1E is guaranteed to meet performance
specifications over the 0°C to 125°C internal operating temperature
range. Specifications over the full –40°C to 125°C internal operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTM4636-1I is guaranteed to meet
specifications 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 resistance and
other environmental factors.
Note 3: The minimum on-time condition is specified for a peak-to-peak
inductor ripple current of ~40% of IMAX Load. (See the Applications
Information section)
Note 4: See output current derating curves for different VIN, VOUT and TA.
Note 5: Guaranteed by design.
Note 6: 100% tested at wafer level.
For more information www.linear.com/LTM4636-1
46361f
5
5 Page 
LTM4636-1
Decoupling Requirements TA = 25°C. Use Figure 1 configuration.
SYMBOL
CIN
PARAMETER
External Input Capacitor Requirement
(VIN = 4.70V to 16V, VOUT = 1.5V)
CONDITIONS
IOUT = 40A, 6 × 22µF Ceramic X7R Capacitors
(See Table 4)
MIN TYP MAX UNITS
100 µF
COUT
External Output Capacitor Requirement
(VIN = 4.70V to 16V, VOUT = 1.5V)
IOUT = 40A (See Table 4)
1000 µF
Operation
Power Module Description
The LTM4636-1 is a high efficiency regulator that can
provide a 40A output with few external input and output
capacitors. This module provides precisely regulated output
voltages programmable via external resistors from 0.6V DC
to 3.3V DC over a 4.70V to 15V input range. The Typical
Application schematic with protection is shown in Figure 20.
The LTM4636-1 has an integrated constant-frequency
current mode regulator, power MOSFETs, 0.18µH induc-
tor, protection circuitry, 5V regulator and other supporting
discrete components. The switching frequency range is
from 250kHz to 770kHz, and the typical operating frequency
is 400kHz. For switching noise-sensitive applications, it
can be externally synchronized from 250kHz to 800kHz,
subject to minimum on-time limitations and limiting the
inductor ripple current to less than 40% of maximum
output current.
A single resistor is used to program the frequency. See
the Applications Information section.
With current mode control and internal feedback loop
compensation, the LTM4636-1 module has sufficient sta-
bility margins and good transient performance with a wide
range of output capacitors, even with all ceramic output
capacitors. An option has been provided for external loop
compensation. LTpowerCAD™ can be used to optimize
the external compensation option. See the Applications
Information section.
Current mode control provides cycle-by-cycle fast current
limit in an overcurrent condition. An internal overvoltage
monitor feedback pin referred will attempt to protect the
output voltage in the event of an overvoltage >10%. The
top MOSFET is turned off and the bottom MOSFET is
turned on until the output is cleared.
Pulling the RUNC pin below 1.1V forces the regulator con-
troller into a shutdown state. The TRACK/SS pin is used for
programming the output voltage ramp and voltage tracking
during start-up. See the Applications Information section.
Optional internal overvoltage protection and overtem-
perature functions can be used to protect from power
MOSFET failures, input and output overvoltage and over-
temperature conditions. These two features can be used
to trip off and retry an input circuit breaker in the event
of either/or both an overvoltage and overtemperature
fault. The OVP_TRIP, OVER_TEMP, TMON, OVP_SET,
CROWBAR and OTP_SET pins are all used to support these
two features. These features can be implemented along
with an input circuit breaker to protect expensive systems
boards, processors and FPGA devices from damage. See
the Applications Information section.
The LTM4636-1 is internally compensated to be stable
over all operating conditions. Table 5 provides a guideline
for input and output capacitances for several operating
conditions. LTpowerCAD is available for transient and
stability analysis. This tool can be used to optimize the
regulators loop response.
A remote sense amplifier is provided for accurately sensing
output voltages at the load point.
Multiphase operation can be easily employed with the
internal clock source or a synchronization clock applied
to the MODE/PLLIN input using an external clock source,
and connecting the CLKOUT pins. See the Applications
Information section. Review Figure 4.
High efficiency at light loads can be accomplished with
selectable Burst Mode operation using the MODE_PLLIN
pin. These light load features will accommodate battery
operation. Efficiency graphs are provided for light load op-
eration in the Typical Performance Characteristics section.
46361f
For more information www.linear.com/LTM4636-1
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4636-1.PDF ] | |
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