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參數(shù)資料
| 型號： | LTM4612MPV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 940 kHz SWITCHING FREQ-MAX, PBGA133 |
| 封裝： | 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, MO-222, LGA-133 |
| 文件頁數(shù)： | 3/26頁 |
| 文件大?。?/td> | 5123K |
| 代理商： | LTM4612MPV#PBF |
LTM4612
4612fa
The typical LTM4612 application circuit is shown in
Figure 18. External component selection is primarily
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 Stepdown 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
Characteristic curve labeled “VIN to VOUT Step-Down
Ratio.” Note that additional thermal derating may be ap-
plied. See the Thermal Considerations and Output Current
Derating section in this data sheet.
Output Voltage Programming and Margining
ThePWMcontrollerhasaninternal0.6Vreferencevoltage.
As shown in the Block Diagram, a 100k internal feedback
resistor connects the VOUT and VFB pins together. Adding a
resistor, RFB, from the VFB pin to the SGND pin programs
the output voltage.
V
k R
R
OUT
FB
=
+
0 6
100
.
Table 1. RFB Standard 1% Resistor Values vs VOUT
VOUT (V)
3.3
5
6
8
10
12
14
15
RFB (kW) 22.1 13.7
11
8.06
6.34
5.23
4.42
4.12
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):
V
OUT MARGIN
OUT
(
)
%
=
100
Where %VOUT is the percentage of VOUT to be margined,
and VOUT(MARGIN) is the margin quantity in volts:
R
V
k
PGM
OUT
OUT MARGIN
=
0 6
1 18
10
.
.
(
)
Where RPGM is the resistor value to place on the MPGM
pin to ground.
applicaTions inForMaTion
Figure 2. Operating Frequency vs Output Voltage
The output margining will be ± margining of the value.
This is controlled by 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
Operating Frequency
The operating frequency of the LTM4612 is optimized to
achieve the compact package size and the minimum
output ripple voltage while still keeping high efficiency.
As shown in Figure 2, the frequency is linearly increased
with larger output voltages to keep the low output cur-
rent ripple. Figure 3 shows the inductor current ripple
DI
with different output voltages. In most applications, no
additional frequency adjusting is required.
Figure 3. Inductor Current Ripple vs Output Voltage
VOUT (V)
2
600
800
1200
8
12
4612 F02
400
4
6
10
14
16
200
1000
FREQUENCY
(kHz)
2
2.5
3.0
2.0
1.5
6
10
4
8
12
14
16
1.0
0.5
3.5
4612 F03
VIN = 36V
VIN = 28V
VIN = 20V
VOUT (V)
INDUCTOR
CURRENT
RIPPLE
I
(A)
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