參數(shù)資料
型號(hào)： LTC1434CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-SOIC -40 to 85
中文描述： 1.2 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 0.150 INCH, PLASTIC, SSOP-20
文件頁(yè)數(shù)： 10/20頁(yè)
文件大小： 379K
代理商： LTC1434CGN
10
LTC1433/LTC1434
APPLICATIO
S I
FOR
ATIO
U
Efficiency Considerations
Since there are two separate pins for the drain of the small
and large P-channel switch, we could utilize two induc-
tors to further enhance the efficiency of the regulator over
the low load current range. Figure 4 shows the circuit
connection.(Also refer to the Typical Applications sec-
tion.)
W
U
U
Figure 4. Using Two Inductors for Higher Low Current Efficiency
BSW
SSW
D1
D2
1433/34 F04
L2
L1
LTC1433/
LTC1434
To reduce core losses, the user can use a higher value
inductor on the small P-channel switch. Since this switch
only carries a small part of the overall current, the user can
still use a small physical size inductor without sacrificing
on copper losses. The Schottky diode can also be chosen
with a lower current rating. For the graph in Figure 5, a
Coilcraft DT1608C series inductor is used along with a
MBRS0520LT3 Schottky diode on the SSW pin. As can be
seen from Figure 5, the average efficiency gain over the
region where the small P-channel is on is about 3%.
LOAD CURRENT (A)
0.001
60
E
70
80
0.01
0.1
1
1433/34 F05
50
40
100
90
V
IN
= 5V
V
IN
= 9V
ONE 22
μ
H INDUCTOR
ON SSW AND BSW
100
μ
H ON SSW
22
μ
H ON BSW
V
OUT
= 3.3V
C
OSC
= 47pF
Figure 5. Efficiency Comparison Between Single Inductor
and Dual Inductor
Hence, the dual inductor configuration is good for the user
who requires as high an efficiency as possible at low load
while retaining constant frequency operation.
Output Voltage Programming
The LTC1433/LTC1434 family all have pin selectable out-
put voltage programming. The output voltage is selected
by the V
PROG
pin as follows:
V
PROG
= 0V
V
PROG =
V
IN
V
PROG
= Open (DC)
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= Adjustable
The LTC1433/LTC1434 family also has remote output
voltage sense capability. The top of the internal resistive
divider is internally connected to V
OSENSE
. For fixed output
voltage applications, the V
OSENSE
pin is connected to the
output voltage as shown in Figure 6
.
When using an
external resistive divider, the V
PROG
pin is left open DC and
the V
OSENSE
pin is connected to the feedback resistors as
shown in Figure 7. To prevent stray pickup, a 100pF
capacitor is suggested across R1 located close to the
LTC1433/LTC1434.
R1
R2
OPEN (DC)
1433/34 F07
100pF
V
OUT
V
PROG
SGND
LTC1433/
LTC1434
V
OSENSE
V
OUT
= 1.19V 1 +
R2
R1
(
)
Figure 7. LTC1433/LTC1434 Adjustable Applications
V
PROG
SGND
LTC1433/
LTC1434
1433/34 F06
C
OUT
V
OUT
GND: V
OUT
= 3.3V
V
IN
: V
OUT
= 5V
+
V
OSENSE
Figure 6. LTC1433/LTC1434 Fixed Output Applications
相關(guān)PDF資料
PDF描述
LTC1434I 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-SOIC -40 to 85
LTC1433 450mA, Low Noise Current Mode Step-Down DC/DC Converters(450mA,低噪聲，脈寬調(diào)制電流型，步降DC/DC變換器)
LTC1434 450mA, Low Noise Current Mode Step-Down DC/DC Converters(450mA,低噪聲，脈寬調(diào)制電流型，步降DC/DC變換器)
LTC1435A 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-TSSOP -40 to 85
LTC1435AC 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-TSSOP -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
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