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参数资料
| 型号： | LTC3632IMS8E#TRPBF |
| 厂商： | LINEAR INTEGRATED SYSTEMS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.06 A SWITCHING REGULATOR, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 5/20页 |
| 文件大小： | 247K |
| 代理商： | LTC3632IMS8E#TRPBF |
LTC3632
13
3632f
APPLICATIONS INFORMATION
The resistive divider allows the VFB pin to sense a fraction
of the output voltage as shown in Figure 6.
VFB
LTC3632
GND
VOUT
R2
3632 F06
R1
Figure 6. Setting the Output Voltage
To minimize the no-load supply current, resistor values in
the megohm range should be used. The increase in supply
current due to the feedback resistors can be calculated
from:
ΔI
V
RR
V
VIN
OUT
IN
=
+
12
Run Pin with Programmable Hysteresis
The LTC3632 has a low power shutdown mode controlled
by the RUN pin. Pulling the RUN pin below 0.7V puts the
LTC3632 into a low quiescent current shutdown mode
(IQ ~ 3μA). When the RUN pin is greater than 1.2V, the
controller is enabled. Figure 7 shows examples of con-
gurations for driving the RUN pin from logic.
LTC3632
RUN
4.7M
VIN
3632 F07
LTC3632
RUN
VSUPPLY
Figure 7. RUN Pin Interface to Logic
The RUN pin can alternatively be congured as a precise
undervoltage lockout (UVLO) on the VIN supply with a
resistive divider from VIN to ground. The RUN pin com-
parator nominally provides 10% hysteresis when used in
this method; however, additional hysteresis may be added
with the use of the HYST pin. The HYST pin is an open-
drain output that is pulled to ground whenever the RUN
comparator is not tripped. A simple resistive divider can
be used as shown in Figure 8 to meet specic VIN voltage
requirements.
Specic values for these UVLO thresholds can be computed
from the following equations:
Ri
g V UVLO Threshold
V
R
IN
sin
.
=+
121
1
2
=+
+
Fall g V UVLO Threshold
V
R
RR
IN
in
.
110
1
2
3
The minimum value of these thresholds is limited to the
internal VIN UVLO thresholds that are shown in the Electri-
cal Characteristics table. The current that ows through
this divider will directly add to the shutdown, sleep and
active current of the LTC3632, and care should be taken to
minimize the impact of this current on the overall efciency
of the application circuit. Resistor values in the megohm
range may be required to keep the impact on quiescent
shutdown and sleep currents low. Be aware that the HYST
pin cannot be allowed to exceed its absolute maximum
rating of 6V. To keep the voltage on the HYST pin from
exceeding 6V, the following relation should be satised:
V
R
RR
R
V
IN MAX
()
3
12
3
6
++
<
The RUN pin may also be directly tied to the VIN supply
for applications that do not require the programmable
undervoltage lockout feature. In this conguration, switch-
ing is enabled when VINsurpassestheinternalundervoltage
lockout threshold.
Soft-Start
The internal 0.75ms soft-start is implemented by ramping
both the effective reference voltage from 0V to 0.8V and the
peak current limit set by the ISET pin (10mA to 50mA).
RUN
LTC3632
HYST
VIN
R2
R1
R3
3632 F08
Figure 8. Adjustable Undervoltage Lockout
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