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| 型号： | LT3494EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.18A 8DFN |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 38 V |
| 输入电压： | 2.3 V ~ 16 V |
| PWM 型： | 混合物 |
| 电流 - 输出： | 180mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-DFN（3x2） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3494EDDB#TRMPBFDKR |
LT3494/LT3494A
APPLICATIONS INFORMATION
Capacitor Selection
The small size and low ESR of ceramic capacitors makes
them suitable for most LT3494/LT3494A applications. X5R
and X7R types are recommended because they retain their
capacitance over wider voltage and temperature ranges
than other types such as Y5V or Z5U. A 4.7μF input capaci-
tor and a 2.2μF to 10μF output capacitor are suf?cient for
most LT3494/LT3494A applications. Always use a capacitor
with a suf?cient voltage rating. Many capacitors rated at
1.500
1.250
1.000
0.750
0.500
0.250
2.2μF to 10μF, particularly 0805 or 0603 case sizes, have
0
0
.25
0.5 .75 1.0
1.25
1.5
R 1 = 182 ? ?
– 1 ? k Ω
greatly reduced capacitance when bias voltages are ap-
plied. Be sure to check actual capacitance at the desired
output voltage. Generally a 1206 size capacitor will be
adequate. A 0.22μF or 0.47μF capacitor placed on the
CAP node is recommended to ?lter the inductor current
while the larger 2.2μF to 10μF placed on the V OUT node
will give excellent transient response and stability. Table 2
shows a list of several capacitor manufacturers. Consult
the manufacturers for more detailed information and for
their entire selection of related parts.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER PHONE URL
Taiyo Yuden 408-573-4150 www.t-yuden.com
CTRL VOLTAGE (V)
3494 F01
Figure 1. CTRL to FB Transfer Curve
To set the maximum output voltage, select the values of
R1 according to the following equation:
? V OUT ( MAX ) ?
? 1 . 225 ?
When CTRL is used to override the internal reference,
the output voltage can be lowered from the maximum
value down to nearly the input voltage level. If the voltage
source driving the CTRL pin is located at a distance to the
LT3494/LT3494A, a small 0.1μF capacitor may be needed
AVX
Murata
Kemet
843-448-9411
814-237-1431
408-986-0424
www.avxcorp.com
www.murata.com
www.kemet.com
to bypass the pin locally.
Choosing a Feedback Node
Setting Output Voltage and
the Auxiliary Reference Input
The LT3494/LT3494A are equipped with both an internal
1.225V reference and an auxiliary reference input. This al-
lows the user to select between using the built-in reference
and supplying an external reference voltage. The voltage
at the CTRL pin can be adjusted while the chip is operat-
ing to alter the output voltage of the LT3494/LT3494A for
purposes such as display dimming or contrast adjustment.
The single feedback resistor may be connected to the V OUT
pin or to the CAP pin (see Figure 2). Regulating the V OUT
pin eliminates the output offset resulting from the voltage
drop across the output disconnect PMOS. Regulating the
CAP pin does not compensate for the voltage drop across
the output disconnect, resulting in an output voltage V OUT
that is slightly lower than the voltage set by the resistor
divider. Under most conditions, it is advised that the
feedback resistor be tied to the V OUT pin.
To use the internal 1.225V reference, the CTRL pin must be
1
8
C1
1
8
C1
held higher than 1.5V. When the CTRL pin is held between
0V and 1.5V, the LT3494 will regulate the output such that
the FB pin voltage is nearly equal to the CTRL pin voltage.
At CTRL voltages close to 1.225V, a soft transition occurs
between the CTRL pin and the internal reference. Figure 1
3
5
4
SW CAP
V CC V OUT
LT3494
SHDN FB
CTRL GND
7
6
2
R1
V OUT
C3
3
5
4
SW CAP
V CC V OUT
LT3494
SHDN FB
CTRL GND
7
6
2
R1
3494 F02
shows this behavior.
Figure 2. Feedback Connection Using the CAP Pin or the V OUT Pin
3494fb
8
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| LT3495BEDDB#TRMPBF | 功能描述:IC REG BOOST ADJ 0.65A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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