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参数资料
| 型号： | LTC3459ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ SOT23-6 |
| 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： | 2.5 V ~ 10 V |
| 输入电压： | 1.5 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3459
TYPICAL APPLICATIONS
Very low operating quiescent current and synchronous
operation allow for greater than 85% conversion ef?ciency
in many applications. Lower output voltages will result in
lower ef?ciencies since the N- and P-channel R DS(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.
The LTC3459 is designed to control peak inductor current
when V IN is greater than or less than V OUT . This allows
current to be controlled during start-up in a boost applica-
tion, for example, or V OUT to be regulated below V IN 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 V OUT is less than ~3.5V, the body of the internal
synchronous P-channel MOSFET recti?er is connected to
V IN , and the SW pin rises a diode above V IN when current
is delivered to the load. While ef?ciency is compromised
in this mode of operation, current to the SuperCap is
5V from Li-Ion Input
15μH*
100
V OUT = 5V
V IN
2.5V TO 4.2V
V IN
SW
V OUT
V OUT
5V
90
V IN = 4.2V
Li-Ion
BATTERY
+
1μF
OFF ON
LTC3459
SHDN
FB
1M
47pF
4.7μF
80
V IN = 2.5V
GND
*COILCRAFT DO3314
332k
3459 TA04a
70
60
50
0.01
0.1
1
10
100
10V from 3.3V or 5V Input
I LOAD (mA)
3459 TA04b
33μH*
100
V OUT = 10 V
V IN
3.3V TO 5V
V IN
SW
V OUT
V OUT
10V
90
V IN = 5V
LTC3459
2M
47pF
80
1μF
OFF ON
SHDN
FB
4.7μF
V IN = 3.3V
GND
*COILCRAFT DO3314
280k
3459 TA05a
70
60
50
0.01
0.1
1
10
100
I LOAD (mA)
3459 TA05b
3459fc
9
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