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參數(shù)資料
| 型號： | LTC3525LESC6-3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, EIAJ, MO-203AB, SC-70, 6 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 487K |
| 代理商： | LTC3525LESC6-3#PBF |
LTC3525L-3
6
3525lfa
The LTC3525L-3 is a high performance Burst Mode op-
eration 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 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 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 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
rectifier is not enabled in this mode resulting in lower
efficiency and reduced output current capability.
The operating quiescent current is only 7A typical, allow-
ing the converter to maintain high efficiency 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. Although
SHDN can be driven above VIN or VOUT (up to the absolute
maximum rating) without damage, the LTC3525L-3 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 VIN or
VOUT. If the test mode is engaged, normal PWM switching
action is interrupted, which can cause undesirable opera-
tioninsomeapplications.Therefore,inapplicationswhere
SHDN may be driven above VIN, a resistor divider or other
means must be employed to keep the SHDN voltage below
(VIN + 0.4V) to prevent the possibility of the test mode
being engaged. Please refer to Figure 1 for two possible
implementations.
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
Astart-uposcillatorallowstheLTC3525L-3tostartwithin-
putvoltagesaslowas0.7V.Itremainsinstart-upmodeuntil
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.
LTC3525L-3
1M
VCNTRL
R
VIN
VCNTRL
SHDN
LTC3525L-3
1M
3525L F01
ZETEX ZC2811E
R > (VCNTRL/(VIN + 0.4) – 1) M
SHDN
Figure 1. Recommended Shutdown Circuits when Driving SHDN Above VIN
OPERATION
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