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参数资料
| 型号： | LTC3526LEDC#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件页数： | 2/16页 |
| 文件大小： | 342K |
| 代理商： | LTC3526LEDC#TRM |
LTC3526L
10
3526lf
APPLICATIO S I FOR ATIO
WU
U
VIN > VOUT OPERATION
The LTC3526L will maintain voltage regulation even when
the input voltage is above the desired output voltage. Note
that the efciency is much lower in this mode, and the
maximum output current capability will be less. Refer to
the Typical Performance Characteristics.
SHORT-CIRCUIT PROTECTION
The LTC3526L output disconnect feature allows output
short circuit while maintaining a maximum internally set
current limit. To reduce power dissipation under short-
circuit conditions, the peak switch current limit is reduced
to 400mA (typical).
SCHOTTKY DIODE
Although not recommended, adding a Schottky diode from
SW to VOUT will improve efciency by about 2%. Note
that this defeats the output disconnect and short-circuit
protection features.
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3526L demands careful
attention to board layout. A careless layout will result in
reduced performance. Figure 1 shows the recommended
component placement. A large ground pin copper area
will help to lower the die temperature. A multilayer board
with a separate ground plane is ideal, but not absolutely
necessary.
COMPONENT SELECTION
Inductor Selection
The LTC3526L can utilize small surface mount chip induc-
tors due to their fast 1MHz switching frequency. Inductor
values between 3.3H and 6.8H are suitable for most
applications. Larger values of inductance will allow slightly
greater output current capability (and lower the Burst
Mode threshold) by reducing the inductor ripple current.
Increasing the inductance above 10H will increase com-
ponent size while providing little improvement in output
current capability.
The minimum inductance value is given by:
L
VV
V
Ripple V
IN MIN
OUT MAX
IN MIN
OUT
>
()
(
)
()
(
–
M
MAX)
where:
Ripple = Allowable inductor current ripple (amps peak-
peak)
VIN(MIN) = Minimum input voltage
VOUT(MAX) = Maximum output voltage
The inductor current ripple is typically set for 20% to
40% of the maximum inductor current. High frequency
ferrite core inductor materials reduce frequency depen-
dent power losses compared to cheaper powdered iron
types, improving efciency. The inductor should have
low ESR (series resistance of the windings) to reduce
the I2R power losses, and must be able to support the
Figure 1. Recommended Component Placement for Single Layer Board
+
SW
LTC3526L
1
GND
MINIMIZE
TRACE ON FB
AND SW
2
VIN
MULTIPLE VIAS
TO GROUND PLANE
VIN
VOUT
FB
SHDN
3526 F01
3
6
5
4
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