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參數(shù)資料
| 型號(hào)： | LTC1626CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | LinCMOS(TM) Timer 8-PDIP |
| 中文描述： | 1.6 A SWITCHING REGULATOR, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 280K |
| 代理商： | LTC1626CS |
8
LTC1626
ESR
COUT
< 2R
SENSE
To avoid overheating, the output capacitor must be sized
to handle the ripple current generated by the inductor. The
worst-case RMS ripple current in the output capacitor is
given by:
I
RMS
<
150mV/2R
SENSE
(A
RMS
)
Generally, once the ESR requirements for C
OUT
have been
met, the RMS current rating far exceeds the I
RIPPLE
requirement.
In some surface mount applications, multiple capacitors
may have to be paralleled to meet the capacitance, ESR or
RMS current handling requirement of the application.
Aluminum electrolyte and dry tantalum capacitors are
both available in surface mount configurations. In the case
of tantalum, it is critical that the capacitors are surge tested
for use in switching power supplies. An excellent choice is
the AVX TPS series of surface mount tantalums, available
in case heights ranging from 2mm to 4mm. Other capaci-
tor types include Sanyo OS-CON, Nichicon PL series and
Sprague 595D series. Consult the manufacturer for other
specific recommendations.
When the capacitance of C
OUT
is made too small, the
output ripple at low frequencies will be large enough to trip
the voltage comparator. This causes Burst Mode opera-
tion to be activated when the LTC1626 would normally be
in continuous mode operation. The effect will be most
pronounced with low R
SENSE
values and can be improved
at higher frequencies.
Low-Battery Detection
The low-battery detector senses the input voltage through
an external resistive divider. This divided voltage connects
to the (–) input of a voltage comparator (LBI) and is
compared to an internal 1.25V reference voltage. Neglect-
ing LBI
input bias current, the following expression is used
for setting the trip voltage threshold:
V
R
R
LB TRIP
=
+
1 25 1
4
3
APPLICATIO
S I
FOR
ATIO
U
W
U
U
The LBO
is an N-channel open drain that goes low when
the battery voltage drops below the threshold voltage. In
shutdown, the comparator is disabled and LBO
is in the
high impedance state. Figure 4 is a schematic diagram
detailing the low-battery comparator connection and op-
eration.
+
–
LBI
R4
1%
R3
1%
C
0.01
μ
F
V
IN
1.25V
LBO
1626 F04
LTC1626
Figure 4. Low-Battery Comparator
Setting the Output Voltage
The LTC1626 develops a 1.25V reference voltage between
the feedback pin V
FB
and the signal ground as shown in
Figure 5. By selecting resistor R1, a constant current is
caused to flow through R1 and R2 which sets the desired
output voltage. The regulated output voltage is deter-
mined by:
V
R
R
OUT
=
+
1 25 1
2
1
R1 should be
≤
10k to ensure that sufficient current flows
through the divider to maintain accuracy and to provide a
minimum load for the regulator output at elevated
temperatures. (See Switch Leakage Current curve n Typi-
cal Performance Characteristics section.)
To prevent stray pickup, a 100pF capacitor is suggested
across R1, located close to the LTC1626.
100pF
R2
1%
R1
10k
1%
V
FB
SGND
V
OUT
1626 F05
LTC1626
Figure 5. Setting the Output Voltage
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