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參數(shù)資料
| 型號： | LTC1174HVCS8#TR-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大小： | 241K |
| 代理商： | LTC1174HVCS8#TR-5 |
9
LTC1174
LTC1174-3.3/LTC1174-5
Figure 3. Low-Battery Comparator
Figure 5. Positive-to-Negative 5V Converter
Figure 4. LTC1174 Adjustable Configuration
APPLICATIO S I FOR ATIO
WU
UU
LTC1174
–
+
1.25V
REFERENCE
R4
R3
3
VIN
1174 F03
LTC1174 Adjustable/Low Noise Applications
The LTC1174 develops a 1.25V reference voltage between
the feedback (Pin 1) terminal and ground (see Figure 4). By
selecting resistor R1, a constant current is caused to flow
through R1 and R2 to set the overall output voltage. The
regulated output voltage is determined by:
V
R
OUT =+
125 1
2
1
.
For most applications, a 30k resistor is suggested for R1.
To prevent stray pickup, a 100pF capacitor is suggested
across R1 located close to the LTC1174. Alternatively, a
capacitor across R2 can be used to increase the switching
frequency for low noise operation.
R2
R1
1
VOUT
1174 F04
100pF*
6.8nF**
*
**
ADJUSTABLE APPLICATIONS
LOW NOISE APPLICATIONS
LTC1174
VFB
Inverting Applications
The LTC1174 can easily be set up for a negative output
voltage. If – 5V is desired, the LTC1174-5 is ideal for this
application as it requires the least components. Figure 5
shows the schematic for this application. Note that the
output voltage is now taken off the GND pin. Therefore,
the maximum input voltage is now determined by the
3
SHUTDOWN
2
7
6
8
1
5
4
50
H**
VOUT
–5V
45mA
MBRS140T3
1174 F05
*
**
AVX TPSD476K016
COILTRONICS CTX50-4
INPUT VOLTAGE
4V TO 12V
0.1
F
47
F*
16V
×2
47
F*
16V
×2
LTC1174HV-5
LBIN
LBOUT
IPGM
GND
VIN
VOUT
SW
+
difference between the absolute maximum voltage rating
and the output voltage. A maximum of 12V is specified in
Figure 5, giving the circuit a 1.5V of headroom for VIN. Note
that the circuit can operate from a minimum of 4V, making
it ideal for a 4 NiCad cell application. For a higher output
current circuit, please refer to the Typical Applications
section.
Absolute Maximum Ratings and Latchup Prevention
The absolute maximum ratings specify that SW (Pin 5) can
never exceed VIN (Pin 6) by more than 0.3V. Normally this
situation should never occur. It could, however, if the
output is held up while the supply is pulled down. A con-
dition where this could potentially occur is when a battery
is supplying power to an LTC1174/LTC1174-3.3/
LTC1174-5 regulator and also to one or more loads in
parallel with the the regulator’s VIN. If the battery is dis-
connected while the LTC1174/LTC1174-3.3/LTC1174-5
regulator is supplying a light load and one of the parallel
circuits is a heavy load, the input capacitor of the LTC1174/
LTC1174-3.3/LTC1174-5 regulator could be pulled down
faster than the output capacitor, causing the absolute
maximum ratings to be exceeded. The result is often a
latchup which can be destructive if VIN is reapplied. Bat-
tery disconnect is possible as a result of mechanical stress,
bad battery contacts or use of a lithium-ion battery with
a built-in internal disconnect. The user needs to assess
his/her application to determine whether this situation
could occur. If so, additional protection is necessary.
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