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参数资料
| 型号： | LTC3525LESC6-3TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封装： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 10/12页 |
| 文件大小： | 235K |
| 代理商： | LTC3525LESC6-3TRM |
LTC3525L-3
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OPERATIO
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The LTC3525L-3 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 efciency alternative to charge pump
designs. It is designed to start up from a single alkaline
or nickel cell, with input voltages as low as 0.7V typical
or 0.88V maximum, or from two or three cells (or a Li-ion
battery), with voltages as high as 4.5V. Once started, VIN
can be as low as 0.5V (depending on load current) and
maintain regulation. The output voltage is preset internally
to 3V. Peak switch current is 400mA minimum, providing
regulation with load currents up to 160mA, depending on
input voltage.
Synchronous rectication provides high efciency opera-
tion while eliminating the need for an external Schottky
diode. True output disconnect eliminates inrush current
at start-up, and allows VOUT to be disconnected from VIN,
for zero shutdown current.
The output disconnect feature also allows the LTC3525L-3
to maintain regulation with an input voltage equal to or
greater than VOUT. Note, however, that the synchronous
rectier is not enabled in this mode resulting in lower
efciency and reduced output current capability.
The operating quiescent current is only 7A typical, allow-
ing the converter to maintain high efciency at extremely
light loads.
Shutdown
The LTC3525L-3 is shut down by pulling SHDN below
0.3V, and made active by raising it above 0.88V. Note that
SHDN can be driven as high as 6V, however, if it is more
than 0.9V above the higher of VIN or VOUT, the SHDN input
current will increase from zero to 1.5A.
After the SHDN pin rises, there is a short delay before
switching starts. The delay is 20s to 120s, depending
on input voltage (see Typical Performance Characteristics
curve).
Start-Up
A start-up oscillator allows the LTC3525L-3 to start with in-
put voltages as low as 0.7V. It remains in start-up mode until
two conditions are met. VOUT must exceed VIN by at least
0.2V typical and either VIN or VOUT must be greater than
1.8V typical.
During startup, the synchronous rectier is not enabled,
and the internal P-channel synchronous rectier acts as
a follower, causing the peak voltage on SW to reach (VIN
+ 1V) typical. This limits inrush current by maintaining
control of the inductor current when VOUT is less than VIN.
To reduce power dissipation in the P-channel synchronous
rectier when the output is shorted, a foldback feature is
incorporated that reduces the peak inductor current when
VIN is more than 1.7V greater than VOUT.
相关PDF资料 |
PDF描述 |
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| LTC3525LESC6-3 | 0.45 A SWITCHING REGULATOR, PDSO6 |
| LTC3526BEDC-2 | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
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| LTC3526BEDC | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526LBEDC-2#PBF | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3526 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 2MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526B | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526B-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 2MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526BEDC | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm X 2mm DFN |
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