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参数资料
| 型号： | LTC3525ESC6-3.3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V 0.4A SC70-6 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 0.85 V ~ 4.5 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 400mA |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SC-70-6 |
LTC3525-3/
LTC3525-3.3/LTC3525-5
OPERATION
R
The LTC3525 is a high performance Burst Mode operation
only, synchronous boost converter requiring only three
small external components. Its simplicity and small size
make it a high efficiency alternative to charge pump designs.
It is designed to start up from a single alkaline or nickel
cell, with input voltages as low as 1V, or from two or three
cells (or a Li-Ion battery), with voltages as high as 4.5V.
Once started, V IN can be as low as 0.5V (depending on
load current) and maintain regulation. The output voltage
is preset internally to either 3V, 3.3V or 5V. Peak switch
current is 400mA minimum, providing regulation with load
currents up to 150mA, depending on input voltage.
Synchronous rectification provides high efficiency opera-
tion while eliminating the need for an external Schottky
diode. True output disconnect eliminates inrush current
at start-up, and allows V OUT to be disconnected from V IN ,
for zero shutdown current.
The output disconnect feature also allows the LTC3525 to
maintain regulation with an input voltage equal to or greater
than V OUT . Note, however, that the synchronous rectifier
is not enabled in this mode resulting in lower efficiency
and reduced output current capability.
The operating quiescent current is only 7μA typical, allow-
ing the converter to maintain high efficiency at extremely
light loads.
Shutdown
The LTC3525 is shut down by pulling SHDN below 0.4V,
and made active by raising it above 1V. Although SHDN can
be driven above V IN or V OUT (up to the absolute maximum
rating) without damage, the LTC3525 has a proprietary test
mode that may be engaged if SHDN is held in the range
of 0.5V to 1V higher than the greater of V IN or V OUT . If
the test mode is engaged, normal PWM switching action
is interrupted, which can cause undesirable operation
in some applications. Therefore, in applications where
SHDN may be driven above V IN , a resistor divider or other
means must be employed to keep the SHDN voltage below
(V IN + 0.4V) to prevent the possibility of the test mode
being engaged. Please refer to Figure 1 for two possible
implementations.
LTC3525 V IN LTC3525
SHDN SHDN
3525 F01
V CNTRL
1M ZETEX ZC2811E
1M
V CNTRL
R > (V CNTRL /(V IN + 0.4) – 1) M
Figure 1
After the SHDN pin rises, there is a short delay before
switching starts. The delay is 20μs to 120μs, depending
on input voltage (see Typical Performance Characteristics
curve).
Start-Up
A start-up oscillator allows the LTC3525 to start with input
voltages as low as 1V. It remains in start-up mode until
two conditions are met. V OUT must exceed V IN by at least
0.2V typical and either V IN or V OUT must be greater than
1.8V typical.
During start-up, the synchronous rectifier is not enabled,
and the internal P-channel synchronous rectifier acts as
a follower, causing the peak voltage on SW to reach (V IN
+ 1V) typical. This limits inrush current by maintaining
control of the inductor current when V OUT is less than V IN .
To reduce power dissipation in the P-channel synchronous
rectifier when the output is shorted, a foldback feature is
incorporated that reduces the peak inductor current when
V IN is more than 1.7V greater than V OUT .
Normal Operation
Once V OUT has increased more than 0.2V typical above
V IN , and either voltage is above 1.8V, normal operation
begins, with synchronous rectification enabled. In this
mode, the internal N-channel MOSFET connected be-
tween SW and GND stays on until the inductor current
reaches a maximum peak value, after which it is turned
off and the P-channel synchronous rectifier is turned
on. It stays on, delivering current to the output, until the
inductor current has dropped below a minimum value at
3525fb
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3525ESC6-5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 |
| LTC3525ESC6-5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 5V 175mA SC-70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 400mA Synch, Boost Converter in SC70 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 5V, 175mA, SC-70-6, Primary Input Voltage:4.5V, No. of Outputs:1, Output Voltage:5V, Output Current:175mA, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3525ESC6-5#TR | 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 400mA Synch, Boost Converter in SC70 |
| LTC3525ESC6-5#TRM | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.85V to 4.5V 6-Pin SC-70 T/R |
| LTC3525ESC6-5#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 0.4A SC70-6 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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