- 您现在的位置：买卖IC网 > PDF目录67758 > LTC3459EDCB#PBF (LINEAR TECHNOLOGY CORP) 0.09 A SWITCHING REGULATOR, PDSO6 PDF资料下载
参数资料
| 型号： | LTC3459EDCB#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.09 A SWITCHING REGULATOR, PDSO6 |
| 封装： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 12/12页 |
| 文件大小： | 216K |
| 代理商： | LTC3459EDCB#PBF |
LTC3459
9
3459fc
Very low operating quiescent current and synchronous
operation allow for greater than 85% conversion efciency
in many applications. Lower output voltages will result in
lower efciencies since the N- and P-channel RDS(ON)s
will increase. The switching frequency and output power
capability of the LTC3459 are also dependant on input and
output voltages.
Charging a SuperCap
SuperCaps have become a popular alternative to NiCd
batteries as back-up power sources in portable equip-
ment. Capacitance values of one farad and higher are
achievable in small package sizes with leakage currents
in the low microamps. SuperCaps are typically charged
at low currents for several minutes until they reach the
required back-up voltage.
TYPICAL APPLICATIONS
5V from Li-Ion Input
The LTC3459 is designed to control peak inductor current
when VIN is greater than or less than VOUT. This allows
current to be controlled during start-up in a boost applica-
tion, for example, or VOUT to be regulated below VIN when
powered from a fresh battery. Peak current control makes
the LTC3459 an ideal candidate for charging a back-up
source such as a SuperCap. Figure 5 shows an application
where the LTC3459 is used to charge a two-farad, 5V Su-
perCap from a 3.3V input. A NiCd battery could be charged
by the LTC3459 as well, but that application may require
additional circuitry for proper charge termination.
When VOUT is less than ~3.5V, the body of the internal
synchronous P-channel MOSFET rectier is connected to
VIN, and the SW pin rises a diode above VIN when current
is delivered to the load. While efciency is compromised
in this mode of operation, current to the SuperCap is
10V from 3.3V or 5V Input
SW
15μH*
VIN
1M
VOUT
5V
4.7μF
47pF
1μF
LTC3459
SHDN
VOUT
FB
Li-Ion
BATTERY
VIN
2.5V TO 4.2V
OFF ON
GND
332k
3459 TA04a
*COILCRAFT DO3314
+
ILOAD (mA)
60
EFFICIENCY
(%)
70
80
90
100
0.01
1
10
100
3459 TA04b
50
0.1
VOUT = 5V
VIN = 4.2V
VIN = 2.5V
SW
33μH*
VIN
2M
VOUT
10V
VIN
3.3V TO 5V
4.7μF
47pF
1μF
LTC3459
SHDN
VOUT
FB
OFF ON
GND
280k
3459 TA05a
*COILCRAFT DO3314
ILOAD (mA)
60
EFFICIENCY
(%)
70
80
90
100
0.01
1
10
100
3459 TA05b
50
0.1
VOUT = 10V
VIN = 3.3V
VIN = 5V
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3459ES6#PBF | 0.09 A SWITCHING REGULATOR, PDSO6 |
| LTC3520IUF#TRPBF | DUAL SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3520IUF#PBF | DUAL SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3539EDCB#PBF | 2.6 A SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3541EDD#TR | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3459EDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10V Micropower Synchronous Boost Converter |
| LTC3459EDCPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10V Micropower Synchronous Boost Converter |
| LTC3459EDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10V Micropower Synchronous Boost Converter |
| LTC3459EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10V Micropower Synchronous Boost Converter |
| LTC3459ES6 | 制造商:LINER 制造商全称:Linear Technology 功能描述:10V Micropower Synchronous Boost Converter in ThinSOT |
发布紧急采购，3分钟左右您将得到回复。