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| 型号： | LT1073CN8-12 |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV 12V .4A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 12V |
| 输入电压： | 1 V ~ 30 V |
| 频率 - 开关： | 19kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
LT1073
APPLICATIO S I FOR ATIO
Table 1. Component Selection for Step-Up Converters
INPUT
BATTERY
OUTPUT
OUTPUT
INDUCTOR
INDUCTOR
CAPACITOR
VOLTAGE (V)
1.55-1.25
1.30-1.05
1.55-1.25
1.30-1.05
3.1-2.1
3.1-2.1
3.3-2.5
3.1-2.1
3.1-2.1
3.3-2.5
4.5-5.5
4.5-5.5
4.5-5.5
TYPE
Single Alkaline
Single Ni-Cad
Single Alkaline
Single Ni-Cad
Two Alkaline
Two Alkaline
Lithium
Two Alkaline
Two Alkaline
Lithium
TTL Supply
TTL Supply
TTL Supply
VOLTAGE (V)
3
3
5
5
5
5
5
12
12
12
12
12
24
CURRENT (MIN)
60mA
20mA
30mA
10mA
80mA
25mA
100mA
25mA
5mA
30mA
90mA
22mA
35mA
VALUE ( μ H)
82
180
82
180
120
470
150
120
470
150
220
1000
220
PART NUMBER
G GA10-822K, CB 7300-12
G GA10-183K, CB 7300-16
G GA10-822K, CB 7300-12
G GA10-183K, CB 7300-16
G GA10-123K, CB 7300-14
G GA10-473K, CB 7300-21
G GA40-153K, CB 6860-15
G GA10-123K, CB 7300-14
G GA10-473K, CB 7300-21
G GA10-153K, CB 7300-15
G GA40-223K, CB 6860-17
G GA10-104K, CB 7300-25
G GA40-223K, CB 6860-17
VALUE ( μ F)
150
47
100
22
470
150
470
220
100
220
470
100
150
NOTES
*
*
*
*
*
*
G = GOWANDA
CB = CADDELL-BURNS
*Add 68 ? from I LIM to V IN
Measuring Input Current at Zero or Light Load
Obtaining meaningful numbers for quiescent current and
efficiency at low output current involves understanding
how the LT1073 operates. At very low or zero load current,
LT1073. The circuit must be “booted” by shorting V2 to
V SET . After the LT1073 output voltage has settled, discon-
nect the short. Input voltage is V2 and average input
current can be calculated by this formula:
the device is idling for seconds at a time. When the output
voltage falls enough to trip the comparator, the power
switch comes on for a few cycles until the output voltage
I IN =
V 2 – V1
100 ?
100 ?
LTC1050
V1
V2
risessufficientlytoovercomethecomparatorhysteresis.
When the power switch is on, inductor current builds up
to hundreds of milliamperes. Ordinary digital multimeters
are not capable of measuring average current because of
bandwidth and dynamic range limitations. A different
approach is required to measure the 100 μ A off-state and
500mA on-state currents of the circuit.
1M ?
12V
1 μ F*
–
LT1073
CIRCUIT
+ +
1000 μ F
V SET *NONPOLARIZED 1073 F01
Figure 1. Test Circuit Measures No-Load
Quiescent Current of LT1073 Converter
Quiescent current can be accurately measured using the
circuit in Figure 1. V SET is set to the input voltage of the
6
Inductor Selection
A DC/DC converter operates by storing energy as mag-
netic flux, in an inductor core and then switching this
energy into the load. Since it is flux, not charge, that is
stored, the output voltage can be higher, lower, or oppo-
site in polarity to the input voltage by choosing an appro-
priate switching topology. To operate as an efficient energy
transfer element, the inductor must fulfill three require-
ments. First, the inductance must be low enough for the
inductor to store adequate energy under the worst-case
condition of minimum input voltage and switch ON time.
The inductance must also be high enough so that maxi-
mum current ratings of the LT1073 and inductor are not
exceeded at the other worst-case condition of maximum
input voltage and ON time. Additionally, the inductor core
must be able to store the required flux, i.e., it must not
saturate. At power levels generally encountered with
LT1073-based designs, small axial-lead units with
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|---|---|
| LT1073CN8-12#PBF | 功能描述:IC REG BUCK BST INV 12V .4A 8DIP 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1073CN8-5 | 功能描述:IC REG BUCK BST INV 5V 0.4A 8DIP 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1073CN85#PBF | 制造商:Linear Technology 功能描述:LT1073CN85#PBF |
| LT1073CN8-5#PBF | 功能描述:IC REG BUCK BST INV 5V 0.4A 8DIP 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1073CN85PBF | 制造商:Linear Technology 功能描述:LT1073CN85PBF |
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