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参数资料
| 型号： | LTC1515CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压），切换电容（充电泵） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 2 V ~ 10 V |
| 频率 - 开关： | 650kHz |
| 电流 - 输出： | 50mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LTC1515 Series
APPLICATIO N S I N FOR M ATIO N
Output Voltage Selection
R OUT
–
The LTC1515-X versions have internal resistor networks
which set the output voltage. The 5/3 pin controls an
+
2V IN
+
V OUT
–
C OUT
I OUT
internal switch that shorts out a portion of the resistor
network to change the output voltage. A logic high on this
pin produces a 5V output and a low produces either a 3V
output or a 3.3V output.
The output voltage of the LTC1515 is selected using an
external resistor divider (see Figure 1). The output voltage
LT1515 ? F02
Figure 2. Step-Up Mode Equivalent Circuit
40
is determined using the following formula:
V OUT = (1.232V)[1 + (R1/R2)]
The total resistance of R1 and R2 should not exceed 2M,
otherwise excess ripple may appear at V OUT .
30
20
10
I OUT = 20mA
I OUT = 50mA
R1
1
2
SHDN
POR
V OUT
V IN
8
7
0
1
2
3
INPUT VOLTAGE (V)
4
5
3
FB
LTC1515
C1 +
6
LT1515 ? F03
R2
Figure 3. Step-Up Mode R OUT vs Input Voltage
C1 –
4
GND
5
LTC1515 ? F01
down mode, R OUT is internally adjusted to ensure that the
Figure 1. LTC1515 Output Voltage Selection
Maximum V OUT and I OUT Calculations for the LTC1515
The maximum output voltage and current available with
the LTC1515 can be calculated based on the effective
output resistance of the charge pump and the open circuit
output voltage. In step-up mode, the open circuit output
voltage is approximately 2V IN (see Figure 2). In step-down
mode, the open circuit output voltage equals V IN . The
relationship between R OUT and V IN in step-up mode is shown
in Figure 3.
The following formulas can be used to find the maximum
output voltage that may be programmed using the LTC1515
for a given minimum input voltage and output current
load.
Step-Up Mode: Max V OUT = (2)(Min V IN ) – (I OUT )(R OUT )
Step-Down Mode: Max V OUT = (Min V IN ) – (I OUT )(R OUT )
When V IN – (I OUT )(R OUT ) is less than the programmed
V OUT , the part will automatically switch from step-down
mode to step-up mode. In both step-up mode and step-
6
maximum output current rating can be met.
Capacitor Selection
For best performance, low ESR capacitors are recom-
mended for both C IN and C OUT to reduce noise and ripple.
The C IN and C OUT capacitors should be either ceramic or
tantalum and should be 10 μ F or greater. If the input source
impedance is very low (< 0.5 ? ) C IN may not be needed.
Increasing the size of C OUT to 22 μ F or greater will reduce
output voltage ripple — particularly with high V IN voltages
(8V or greater). A ceramic capacitor is recommended for
the flying capacitor C1 with a value of 0.1 μ F or 0.22 μ F.
Smaller values may be used in low output current
applications.
Output Ripple
Normal LTC1515 series operation produces voltage ripple
on the V OUT pin. Output voltage ripple is required for the
parts to regulate. Low frequency ripple exists due to the
hysteresis in the sense comparator and propagation de-
lays in the charge pump enable/disable circuits. High
frequency ripple is also present mainly from the ESR
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