參數(shù)資料
型號(hào)： LTM4601AHVY
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PBGA133
封裝： 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, LGA-133
文件頁(yè)數(shù)： 2/30頁(yè)
文件大?。?/td> 519K
代理商： LTM4601AHVY
LTM4601AHV
10
4601ahvfb
The typical LTM4601AHV application circuits are shown in
Figures 19and20.Externalcomponentselectionisprimar-
ily determined by the maximum load current and output
voltage. Refer to Table 2 for specific external capacitor
requirements for a particular application.
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.
These constraints are shown in the Typical Performance
Characteristics curves labeled “VIN to VOUT Step-Down
Ratio”.Notethatadditionalthermalderatingmayapply.See
the Thermal Considerations and Output Current Derating
section of this data sheet.
Output Voltage Programming and Margining
ThePWMcontrollerhasaninternal0.6Vreferencevoltage.
As shown in the Block Diagram, a 1M and a 60.4k 0.5%
internal feedback resistor connects VOUT and VFB pins
together. The VOUT_LCL pin is connected between the 1M
and the 60.4k resistor. The 1M resistor is used to protect
against an output overvoltage condition if the VOUT_LCL
pin is not connected to the output, or if the remote sense
amplifier output is not connected to VOUT_LCL. In these
cases, the output voltage will default to 0.6V. Adding a
resistor RSET from the VFB pin to SGND pin programs
the output voltage:
VOUT = 0.6V
60.4k
+RSET
RSET
or equivalently:
RSET =
60.4k
VOUT
0.6V
1
Table 1. Standard 1% Resistor Values
RSET
(kΩ)
Open
60.4
40.2
30.1
25.5
19.1
13.3
8.25
VOUT
(V)
0.6
1.2
1.5
1.8
2
2.5
3.3
5
The MPGM pin programs a current that when multiplied
by an internal 10k resistor sets up the 0.6V reference ±
offset for margining. A 1.18V reference divided by the
RPGM resistor on the MPGM pin programs the current.
Calculate VOUT(MARGIN):
VOUT(MARGIN) =
%VOUT
100
VOUT
where %VOUT is the percentage of VOUT you want to
margin, and VOUT(MARGIN) is the margin quantity in volts:
RPGM =
VOUT
0.6V
1.18V
VOUT(MARGIN)
10k
where RPGM is the resistor value to place on the MPGM
pin to ground.
The margining voltage, VOUT(MARGIN), will be added or
subtracted from the nominal output voltage as determined
by the state of the MARG0 and MARG1 pins. See the truth
table below:
MARG1
MARG0
MODE
LOW
NO MARGIN
LOW
HIGH
MARGIN UP
HIGH
LOW
MARGIN DOWN
HIGH
NO MARGIN
Input Capacitors
LTM4601AHV module should be connected to a low AC
impedance DC source. Input capacitors are required to
be placed adjacent to the module. In Figure 20, the 10F
ceramic input capacitors are selected for their ability to
handle the large RMS current into the converter. An input
bulk capacitor of 100F is optional. This 100F capacitor
is only needed if the input source impedance is compro-
mised by long inductive leads or traces.
applicaTions inForMaTion
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