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| 型号： | LTC1574CS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK INV ADJ 16SOIC |
| 标准包装： | 50 |
| 类型： | 降压（降压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 4 V ~ 18.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 最高 200kHz |
| 电流 - 输出： | 340mA，600mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
LTC1574
LTC1574-3.3/LTC1574-5
APPLICATIO S I FOR ATIO
going into Pin 12 being negligible, the following expres-
sion is used for setting the trip limit:
difference between the absolute maximum voltage rating
and the output voltage. A maximum of 12V is specified in
V LBTRIP = 1 . 25 ? 1 +
R 3 ?
V IN
?
?
R4
R3
12
R 4 ?
?
LTC1574
–
+
Figure 4, giving the circuit 1.5V of headroom for V IN . Note
that the circuit can operate from a minimum of 4V,
making it ideal for a four NiCd cell application. For a
higher output current circuit, please refer to the Typical
Applications section.
INPUT VOLTAGE
4V TO 12V
1.25V
REFERENCE
1574 ? F02
Figure 2. Low-Battery Comparator
LTC1574 Adjustable Applications
The LTC1574 develops a 1.25V reference voltage between
the feedback terminal (Pin 10) and ground (see Figure 3).
12
11
6
5
V IN
LTC1574-5
LB IN SHDN
LB OUT V OUT
I PGM SW
GND
2, 4, 13, 15
7
10
3, 14
0.1 μ F
50 μ H**
+
+
47 μ F*
16V
× 2
47 μ F*
16V
× 2
V OUT
–5V
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:
* AVX TPSD476K016
** COILTRONICS CTX50-4
Figure 4. Positive-to-Negative 5V Converter
45mA
1574 ? F04
= 1 . 25 ? 1 +
R 1 ?
V OUT
?
?
R 2 ?
?
Low Noise Regulators
In some applications it is important not to introduce any
switching noise within the audio frequency range. Due to
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 LTC1574.
V OUT
the nature of the LTC1574 during Burst Mode TM operation,
there is a possibility that the regulator will introduce audio
noise at some load currents. To circumvent this problem,
a feed-forward capacitor can be used to shift the noise
spectrum up and out of the audio band. Figure 5 shows the
LTC1574
V FB
10
100pF
R2
R1
low noise connection with C2 being the feed-forward
capacitor. The peak-to-peak output ripple is reduced to
30mV over the entire load range. A toroidal surface mount
Burst Mode is a trademark of Linear Technology Corporation
1574 ? F03
Figure 3. LTC1574 Adjustable Configuration
5
V IN
+
100 μ F*
10V
V IN
5V
Inverting Applications
The LTC1574 can easily be set up for a negative output
voltage. If – 5V is desired, the LTC1574-5 is ideal for this
application as it requires the least components. Figure 4
12
11
6
LB IN
LB OUT
I PGM
LTC1574
SHDN
SW
V FB
GND
2, 4, 13, 15
7
3, 14
10
L1**
100 μ H
56k
33k
C2
6.8nF
+
V OUT
3.3V
425mA
100 μ F*
10V
shows the schematic for this application. Note that the
* AVX TPSD107K010
output voltage is now taken off the GND pins. Therefore,
the maximum input voltage is now determined by the
** COILTRONICS CTX100-4
Figure 5. Low Noise 5V to 3.3V Regulator
1574 ? F05
5
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