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LTM4649 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LTM4649은 전자 산업 및 응용 분야에서
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부품번호 LTM4649 기능
기능 10A Step-Down DC/DC uModule Regulator
제조업체 Linear Technology
로고 Linear Technology 로고


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LTM4649 데이터시트, 핀배열, 회로
LTM4649
10A Step-Down DC/DC
µModule Regulator
Features
n 10A DC Output Current
n Input Voltage Range: 4.5V to 16V
n Output Voltage Range: 0.6V Up to 3.3V
n No Heat Sink or Current Derating Up to 85°C
Ambient Temperature
n ±1.5% Total DC Voltage Output Error
n Multiphase Operation with Current Sharing
n Remote Sense Amplifier
n Built-In General Use Temperature Monitor
n Selectable Pulse-Skipping Mode/Burst Mode®
Operation for High Efficiency at Light Load
n Soft-Start/Voltage Tracking
n Protection: Output Overvoltage and Overcurrent
Foldback
n 9mm × 15mm × 4.92mm BGA Package
Applications
n Telecom, Networking and Industrial Equipment
n Point of Load Regulation
L, LT, LTC, LTM, Burst Mode, µModule, PolyPhase, Linear Technology and the Linear logo 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.
Description
The LTM®4649 is a complete 10A high efficiency switching
mode step-down DC/DC µModule® regulator in a 9mm ×
15mm × 4.92 BGA package. Included in the package are
the switching controller, power FETs, inductor, and all sup-
port components. Operating over an input voltage range
of 4.5V to 16V, the LTM4649 supports an output voltage
range of 0.6V to 3.3V, set by a single external resistor. This
high efficiency design delivers 10A continuous current.
Only bulk input and output capacitors are needed.
High switching frequency and a current mode architecture
enables a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, programmable multiphase
operation, spread spectrum, output voltage tracking for
supply rail sequencing.
Fault protection features include overvoltage protection,
overcurrent protection. The LTM4649 is offered in a small
thermally enhanced 9mm × 15mm × 4.92mm BGA pack-
age. The LTM4649 is available with SnPb (BGA) or RoHS
compliant terminal finish.
Typical Application
4.5V to 16V Input, 1.5V Output DC/DC
µModule Regulator
VIN
4.5V TO 16V
22µF
16V
×2
CLKIN
VIN
INTVCC
SW
FREQ
VOUT
VOUT_LCL
DIFFOUT
RUN LTM4649 DIFFP
MODE
DIFFN
PHMODE
TRACK/SS
VFB
COMP
TEMP
0.1µF GND
PGOOD
CLKOUT
100µF
6.3V
×2
VOUT
1.5V
10A
6.65k
4649 TA01a
Efficiency and Power Loss
at 12V and 5V Input
95 3.0
90 2.5
85 2.0
80 1.5
75 1.0
70
65
0
VIN = 12V 0.5
VIN = 5V
0
2 4 6 8 10
LOAD CURRENT (A)
4649 TA01b
Current Derating: 12V Input,
1.5VOUT, No Heat Sink
12
10
8
6
4
2
400LFM
200LFM
0LFM
0
0 20 40 60 80 100 120
AMBIENT TEMPERATURE (°C)
4649 TA01c
For more information www.linear.com/LTM4649
4649fa
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LTM4649 pdf, 반도체, 판매, 대치품
LTM4649
E lectrical Characteristics The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V per typical application.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
GBP Gain Bandwidth Product
3
CMRR
Common Mode Rejection
(Note 6)
60
IDIFFOUT
RIN
VPGOOD
DIFFOUT Current
Input Resistance
PGOOD Trip Level
VPGL PGOOD Voltage Low
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
VINTVCC Load Reg INTVCC Load Regulation
Oscillator and Phase-Locked Loop
Sourcing
DIFFP, DIFFN to GND
VFB With Respect to Set Output
VVFFBB
Ramping
Ramping
Negative
Positive
IPGOOD = 2mA
ICC = 0mA to 50mA
2
80
–10
10
0.1 0.3
4.8 5 5.2
0.9
fSYNC
fS
RMODE
VIH_CLKIN
VIL_CLKIN
SYNC Capture Range
Nominal Switching Frequency
Mode Input Resistance
Clock Input Level High
Clock Input Level Low
250 800
400 450 500
250
2.0
0.8
UNITS
MHz
dB
mA
%
%
V
V
%
kHz
kHz
V
V
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. Notes are automatically numbered when you apply
the note style.
Note 2: The LTM4649 is tested under pulsed load conditions such that TJ
TA. The LTM4649E is guaranteed to meet performance specifications over
the 0°C to 125°C internal operating temperature range. Specifications over
the –40°C to 125°C internal operating temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTM4649I is guaranteed to meet specifications over the –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 tested at wafer sort.
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.
4649fa
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LTM4649 전자부품, 판매, 대치품
LTM4649
Pin Functions
PACKAGE ROW AND COLUMN LABELING MAY VARY
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
LAYOUT CAREFULLY.
GND (A1-A5, A7-A11, B1, B9-B11, E1, F3, F5, G1-G7):
Ground Pins for Both Input and Output Returns. All ground
pins need to connect with large copper areas underneath
the unit.
TEMP (A6): Onboard Temperature Diode for Monitoring
the VBE Junction Voltage Change with Temperature. See
the Applications Information section.
CLKIN (B3): External Synchronization Input to Phase De-
tector Pin. A clock on this pin will enable synchronization
with forced continuous operation. See the Applications
Information section.
PHMODE (B4): This pin can be tied to GND, tied to INTVCC
or left floating. This pin determines the relative phases
between the internal controllers and the phasing of the
CLKOUT signal. See Table 2 in the Operation section.
MODE (B5): Mode Select Input. Connect this pin to IN-
TVCC to enable Burst Mode operation. Connect to ground
to enable forced continuous mode of operation. Floating
this pin will enable pulse-skipping mode.
NC (B7-B8, C3-C4): No Connection Pins. Either float these
pins or connect them to GND for thermal purpose.
VIN (C1, C8, C9, D1, D3-D5, D7-D9 and E8): Power Input
Pins. Apply input voltage between these pins and GND
pins. Recommend placing input decoupling capacitance
directly between VIN pins and GND pins.
VOUT (C10-C11, D10-D11, E9-E11, F9-F11, G10-G11):
Power Output Pins. Apply output load between these pins
and GND pins. Recommend placing output decoupling
capacitance directly between these pins and GND pins.
SW (C5): Switching Node of the Circuit. This pin is used
to check the switching frequency. Leave pin floating. A
resistor-capacitor snubber can be placed from SW to
PGND to eliminate high frequency switch node ringing.
See the Applications Information section.
PGOOD (C7): Output Voltage Power Good Indicator. Open-
drain logic output that is pulled to ground when the output
voltage is not within ±10% of the regulation point.
VOUT_LCL (G9): This pin is connected to the top of the
internal top feedback resistor for the output. When the
remote sense amplifier is used, connect the remote sense
amplifier output DIFFOUT to VOUT_LCL to drive the 10k top
feedback resistor. When the remote sense amplifier is not
used, connect VOUT_LCL to VOUT directly.
FREQ (E3): Frequency Set Pin. A 10µA current is sourced
from this pin. A resistor from this pin to ground sets a
voltage, that in turn, programs the operating frequency.
Alternatively, this pin can be driven with a DC voltage that
can set the operating frequency. See the Applications In-
formation section. The LTM4649 has an internal resistor
to program frequency to 450kHz.
TRACK/SS (E5): Output Voltage Tracking Pin and Soft-
Start Inputs. The pin has a 1.2µA pull-up current source.
A capacitor from this pin to ground will set a soft-start
ramp rate. In tracking, the regulator output can be tracked
to a different voltage. The different voltage is applied to
a voltage divider then the slave output’s track pin. This
voltage divider is equal to the slave output’s feedback
divider for coincidental tracking. See the Applications
Information section.
FB (E7): The Negative Input of the Error Amplifier. Internally,
this pin is connected to VOUT_LCL with a 10k precision
resistor. Different output voltages can be programmed
with an additional resistor between VFB and ground pins.
In PolyPhase operation, tying the VFB pins together allows
for parallel operation. See the Applications Information
section for details.
RUN (F1): Run Control Pin. A voltage above 1.25V will
turn on the module. Each RUN pin has a 1µA pull-up cur-
rent, once the RUN pin reaches 1.2V an additional 4.5µA
pull-up current is added to this pin.
For more information www.linear.com/LTM4649
4649fa
7

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