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参数资料
| 型号： | LT3464ETS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 115MA TSOT23-8 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 34 V |
| 输入电压： | 2.3 V ~ 10 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 115mA |
| 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： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-8 |
LT3464
APPLICATIO S I FOR ATIO
300
7
6
7
6
250
1
8
V IN SW
OUT
CTRL
LT3464 CAP
SHDN
FB
GND
4
3
5
2
R2
R1
V OUT
1
8
V IN SW
OUT
CTRL
LT3464 CAP
SHDN
FB
GND
4
3
5
2
V OUT
R2
R1
3464 F01
200
150
100
50
0
0
5
10 15 20
COLLECTOR CURRENT (MA)
25
30
3464 F02
R 2 = R 1 ? OUT DROP – 1 ?
Figure 4. Feedback Connection Using the CAP Pin and the OUT Pin
Output Disconnect Considerations
THE LT3464 IS EQUIPPED WITH AN OUTPUT DISCONNECT THAT
ISOLATES THE LOAD FROM THE INPUT DURING SHUTDOWN. SEE THE
OPERATION SECTION FOR A FUNCTIONAL DIAGRAM. THE OUTPUT
DISCONNECT USES A PASS PNP COUPLED WITH CIRCUITRY THAT
VARIES THE BASE CURRENT SUCH THAT THE TRANSISTOR IS CONSIS-
TENTLY AT THE EDGE OF SATURATION, THUS YIELDING THE BEST
COMPROMISE BETWEEN V CE(SAT) AND LOW QUIESCENT CURRENT.
TO REMAIN STABLE, THIS CIRCUIT REQUIRES A BYPASS CAPACITOR
CONNECTED BETWEEN THE OUT PIN AND THE CAP PIN OR
BETWEEN THE OUT PIN AND GROUND. A CERAMIC CAPACITOR WITH
A VALUE OF AT LEAST 0.1 μ F IS A GOOD CHOICE.
THE PNP V CE(SAT) VARIES WITH LOAD CURRENT AS SHOWN IN
FIGURE 5. THIS VOLTAGE DROP (V DROP ) CAN BE ACCOUNTED FOR
WHEN USING THE CAP PIN AS THE FEEDBACK NODE BY SETTING
THE OUTPUT VOLTAGE ACCORDING TO THE FOLLOWING FORMULA:
? V + V ?
? V REF ?
Figure 5: Output Disconnect Voltage Drop (V DROP ) vs Current
INDEFINITE SHORT, BUT CARE MUST BE TAKEN TO AVOID EXCEEDING
THE MAXIMUM JUNCTION TEMPERATURE.
Inrush Current
WHEN V IN IS STEPPED FROM GROUND TO OPERATING VOLTAGE
WHILE THE OUTPUT CAPACITOR IS DISCHARGED, AN INRUSH CURRENT
WILL FLOW THROUGH THE INDUCTOR AND INTEGRATED SCHOTTKY
DIODE INTO THE OUTPUT CAPACITOR. CONDITIONS THAT INCREASE
INRUSH CURRENT INCLUDE A LARGER MORE ABRUPT VOLTAGE STEP AT
V IN , A LARGER OUTPUT CAPACITOR TIED TO THE CAP PIN, AND AN
INDUCTOR WITH A LOW SATURATION CURRENT.
WHILE THE INTERNAL DIODE IS DESIGNED TO HANDLE SUCH EVENTS,
THE INRUSH CURRENT SHOULD NOT BE ALLOWED TO EXCEED 1 AMP.
FOR CIRCUITS THAT USE OUTPUT CAPACITOR VALUES WITHIN THE
RECOMMENDED RANGE AND HAVE INPUT VOLTAGES OF LESS THAN
5V, INRUSH CURRENT REMAINS LOW, POSING NO HAZARD TO
THE DEVICE. IN CASES WHERE THERE ARE LARGE STEPS AT V IN
(MORE THAN 5V) AND/OR A LARGE CAPACITOR IS USED AT THE CAP
PIN, INRUSH CURRENT SHOULD BE MEASURED TO ENSURE SAFE
OPERATION.
IN ADDITION, THE DISCONNECT CIRCUIT HAS A BUILT IN CURRENT
LIMIT OF 25MA (MINIMUM) TO PROTECT THE CHIP DURING SHORT-
CIRCUIT. THIS FEATURE ALLOWS THE LT3464 TO TOLERATE AN
3464f
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3465 | 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
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| LT3465AES6#TR | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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