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参数资料
| 型号： | LTC3809IMSE-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 8/24页 |
| 文件大小： | 256K |
| 代理商： | LTC3809IMSE-1 |
LTC3809-1
16
38091fc
For most applications, a 59k resistor is suggested for RA.
In applications where minimizing the quiescent current is
critical, RA should be made bigger to limit the feedback
divider current. If RB then results in very high impedance,
it may be benecial to bypass RB with a 50pF to 100pF
capacitor CFF.
APPLICATIONS INFORMATION
Figure 3. Setting Output Voltage
LTC3809-1
VFB
VOUT
RB
CFF
RA
38091 F03
Once the controller is enabled, the start-up of VOUT is con-
trolled by the state of the TRACK/SS pin. If the TRACK/SS
pin is connected to VIN, the start-up of VOUT is controlled
by internal soft-start, which slowly ramps the positive
reference to the error amplier from 0V to 0.6V, allowing
VOUT to rise smoothly from 0V to its nal value. The default
internal soft-start time is around 0.74ms. The soft-start
time can be changed by placing a capacitor between the
TRACK/SS pin and GND. In this case, the soft-start time
will be approximately:
tC
mV
A
SS
=
μ
600
1
where 1μA is an internal current source which is always on.
When the voltage on the TRACK/SS pin is less than the
internal 0.6V reference, the LTC3809-1 regulates the VFB
voltage to the TRACK/SS pin voltage instead of 0.6V.
Therefore the start-up of VOUT can ratiometrically track
an external voltage VX, according to a ratio set by a resis-
tor divider at TRACK/SS pin (Figure 5a). The ratiometric
relation between VOUT and VX is (Figure 5c):
V
R
RR
OUT
X
TA
A
AB
TA
TB
=
+
Run and Soft-Start/Tracking Functions
The LTC3809-1 has a low power shutdown mode which is
controlled by the RUN pin. Pulling the RUN pin below 1.1V
puts the LTC3809-1 into a low quiescent current shutdown
mode (IQ = 9μA). Releasing the RUN pin, an internal 0.7μA
(at VIN = 4.2V) current source will pull the RUN pin up
to VIN, which enables the controller. The RUN pin can be
driven directly from logic as showed in Figure 4.
Figure 4. RUN Pin Interfacing
3.3V OR 5V
38091 F04
LTC3809-1
RUN
LTC3809-1
RUN
Figure 5a. Using the TRACK/SS Pin to Track VX
LTC3809-1
VFB
VOUT
VX
TRACK/SS
RB
RA
38091 F5a
RTB
RTA
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