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参数资料
| 型号： | LT1316CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBK ADJ 0.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压，反激式 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 30 V |
| 输入电压： | 1.5 V ~ 12 V |
| 电流 - 输出： | 500mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1316
APPLICATIO N S I N FOR M ATIO N
Table 1 simplifies component selection for commonly
used input and output voltages. The methods used in
determining these values are discussed in more detail later
in this data sheet.
V OUT can be set using the equation:
During the portion of the switch cycle when Q1 is turned
off, current is forced through D1 to C1 causing output
voltage to rise. This switching action continues until
output voltage rises enough to overcome A1’s hysteresis.
Peak switch current is set by a resistor from the R SET pin
)
V OUT = 1.23
)
R2 + R 1
R2
V OUT
R1
R2
FB
to ground. Voltage at the R SET pin is forced to 0.5V by A4
and is used to set up a constant current through R5. This
current also flows through R3 which sets the voltage at the
positive input of comparator A2. When Q1 turns on, the
SW pin goes low and current ramps up at the rate V IN /L.
Current through Q2 is equal to Q1’s current divided by 200.
1316 EQF01
Table 1. R SET Resistor and Inductor Values
When current through Q2 causes the voltage drop across
R4 and R3 to be equal, A2 changes state and resets the
LOAD
R SET
PEAK SWITCH
oscillator, causing Q1 to turn off. Shutdown is accom-
V IN
2
2
2
2
5
5
5
5
V OUT
5
5
5
5
12
28
28
28
CURRENT
10mA
25mA
50mA
75mA
100mA
1mA
5mA
10mA
RESISTOR
36.8k
18.2k
10k
6.81k
6.81k
75k
22.1k
10k
INDUCTOR
100 μ H
68 μ H
47 μ H
33 μ H
82 μ H
100 μ H
100 μ H
100 μ H
CURRENT
80mA
165mA
320mA
500mA
490mA
56mA
140mA
270mA
plished by grounding the SHDN pin.
The low-battery detector A3 has its own 1.17V reference
and is always on. The open collector output device can sink
up to 500 μ A. Approximately 35mV of hysteresis is built
into A3 to reduce “buzzing” as the battery voltage reaches
the trip level.
Current Limit
During active mode when the part is switching, current in
Operation
To understand operation of the LT1316, first examine
Figure 1. Comparator A1 monitors FB voltage which is
V OUT divided down by resistor divider network R1/R2.
When voltage at the FB pin drops below the reference
voltage (1.23V), A1’s output goes high and the oscillator
is enabled. The oscillator has an off-time fixed at 2 μ s and
an on-time limited to 6.3 μ s. Power transistor Q1 is cycled
the inductor ramps up each switch cycle until reaching a
preprogrammed current limit. This current limit value
must be set by placing the appropriate resistor from the
R SET pin to ground. This resistance value can be found by
using Figure 3 to locate the desired DC current limit and
1000
on and off by the oscillator forcing current through the
inductor to alternately ramp up and down (see Figure 2).
100
V OUT
AC COUPLED
200mV/DIV
V SW
5V/DIV
INDUCTOR
CURRENT
100mA/DIV
10
10
R SET (k ? )
100
1316 F03
6
10 μ s/DIV
Figure 2. Switching Waveforms
1316 F02
Figure 3. DC Current Limit vs R SET Resistor
Note: DC Current is the Peak Switch Current if the Power
Transistor had Zero Turn-Off Delay
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1316IS8 | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:否 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 |
| LT1316IS8#PBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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 |
| LT1316IS8#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 500mA, SOIC-8 |
| LT1316IS8#TR | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:否 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 |
| LT1316IS8#TRPBF | 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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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