参数资料
型号: LT1307CMS8
厂商: Linear Technology
文件页数: 13/20页
文件大小: 0K
描述: IC REG BOOST 3.3V/5V 0.1A 8MSOP
标准包装: 50
类型: 升压(升压)
输出类型: 固定
输出数: 1
输出电压: 3.3V,5V
输入电压: 1 V ~ 5 V
PWM 型: 电流模式,混合
频率 - 开关: 600kHz
电流 - 输出: 100mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 管件
供应商设备封装: 8-MSOP
LT1307/LT1307B
APPLICATIO S I FOR ATIO
tions where small size is not critical, Panasonic HFQ series
aluminum electrolytic capacitors have been found to per-
V IN
form well.
Table 2. Vendor Telephone Numbers
SHDN
R2
400k
Q3
SHUTDOWN
CURRENT
VENDOR
Coilcraft
Marcon
Murata-Erie
Sumida
Tokin
AVX
Sprague
Coiltronics
COMPONENTS
Inductors
Capacitors
Inductors, Capacitors
Inductors
Capacitors
Capacitors
Capacitors
Inductors
TELEPHONE
(708) 639-6400
(708) 913-9980
(404) 436-1300
(847) 956-0666
(408) 432-8020
(207) 282-5111
(603) 224-1961
(407) 241-7876
200k
START-UP
CURRENT
Q2
Q1
1307 F13
Figure 13. Shutdown Circuit
LOW-BATTERY DETECTOR
The LT1307’s low-battery detector is a simple PNP input
Diodes
Most of the application circuits on this data sheet specify
the Motorola MBR0520L surface mount Schottky diode.
This 0.5A, low drop diode complements the LT1307 quite
well. In lower current applications, a 1N4148 can be used,
although efficiency will suffer due to the higher forward
drop. This effect is particularly noticeable at low output
voltages. For higher voltage output applications, such as
LCD bias generators, the extra drop is a small percentage
gain stage with an open collector NPN output. The nega-
tive input of the gain stage is tied internally to a 200mV
± 5% reference. The positive input is the LBI pin. Arrange-
ment as a low-battery detector is straightforward. Figure
14 details hookup. R1 and R2 need only be low enough in
value so that the bias current of the LBI pin doesn’t cause
large errors. For R2, 100k is adequate. The 200mV refer-
ence can also be accessed as shown in Figure 15.
3.3V
of the output voltage so the efficiency penalty is small. The
low cost of the 1N4148 makes it attractive wherever it can
be used. In through hole applications the 1N5818 is the all
R1
R2
LBI
+
V IN
LT1307
LBO
1M
TO PROCESSOR
around best choice.
100k
SHUTDOWN PIN
The LT1307 has a Shutdown pin (SHDN) that must be
200mV
INTERNAL
REFERENCE
GND
1307 F14
R1 =
V LB – 200mV
2 μ A
grounded to shut the device down or tied to a voltage equal
or greater than V IN to operate. The shutdown circuit is
shown in Figure 13.
Note that allowing SHDN to float turns on both the start-
Figure 14. Setting Low-Battery Detector Trip Point
up current (Q2) and the shutdown current (Q3) for V IN >
2V BE . The LT1307 doesn’t know what to do in this situation
and behaves erratically. SHDN voltage above V IN is al-
lowed. This merely reverse-biases Q3’s base emitter junc-
tion, a benign condition.
2N3906
V REF
200mV
10k
+
200k
10 μ F
LBO
LBI
V IN
LT1307
GND
1307 F15
Figure 15. Accessing 200mV Reference
1307fa
13
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LT1307CMS8#PBF 功能描述:IC REG BOOST 3.3V/5V 0.1A 8MSOP 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
LT1307CMS8#TR 功能描述:IC REG BOOST 3.3V/5V 0.1A 8MSOP 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
LT1307CMS8#TRPBF 功能描述:IC REG BOOST 3.3V/5V 0.1A 8MSOP 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
LT1307CN8 功能描述:IC REG BOOST 3.3V/5V 0.1A 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: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
LT1307CN8#PBF 功能描述:IC REG BOOST 3.3V/5V 0.1A 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: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