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参数资料
| 型号： | LT1110CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST ADJ 0.4A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 1 V ~ 30 V |
| 频率 - 开关： | 70kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LT1110
A PPLICATI
S I FOR ATIO
dissipation inside the LT1110. Output voltage is deter-
mined by
Converter” section with the following conservative ex-
pression for V SW :
V OUT = ? 1 +
(
)
R 1 ?
?
?
R 2 ?
? 220 mV .
( 23 )
V SW = V R 1 + V SAT ≈ 0 . 9 V . ( 24 )
R2 provides a current path to turn off Q1. R3 provides base
R3 programs switch current limit. This is especially im-
portant in applications where the input varies over a wide
range. Without R3, the switch stays on for a fixed time
each cycle. Under certain conditions the current in L1 can
build up to excessive levels, exceeding the switch rating
and/or saturating the inductor. The 220 ? resistor pro-
grams the switch to turn off when the current reaches
approximately 800mA. When using the LT1110 in step-
down mode, output voltage should be limited to 6.2V or
less. Higher output voltages can be accommodated by
inserting a 1N5818 diode in series with the SW2 pin
(anode connected to SW2).
drive to Q1. R4 and R5 set output voltage.
Inverting Configurations
The LT1110 can be configured as a positive-to-negative
converter (Figure 7), or a negative-to-positive converter
(Figure 8). In Figure 7, the arrangement is very similar to
a step-down, except that the high side of the feedback is
referred to ground. This level shifts the output negative. As
in the step-down mode, D1 must be a Schottky diode,
and ? V OUT ? should be less than 6.2V. More negative out-
put voltages can be accommodated as in the prior section.
+V IN
R3
Higher Current Step-Down Operation
Output current can be increased by using a discrete PNP
pass transistor as shown in Figure 6. R1 serves as a
+
C2
I LIM
V IN
LT1110
SW1
FB
current limit sense. When the voltage drop across R1
SW2
L1
equals a V BE , the switch turns off. For temperature com-
pensation a Schottky diode can be inserted in series with
GND
D1
1N5818
+
C1
R1
the I LIM pin. This also lowers the maximum drop across R1
to V BE – V D , increasing efficiency. As shown, switch
current is limited to 2A. Inductor value can be calculated
based on formulas in the “Inductor Selection Step-Down
Q1
R2
–V OUT
LT1110 ? TA03
Figure 7. Positive-to-Negative Converter
In Figure 8, the input is negative while the output is
positive. In this configuration, the magnitude of the input
V IN
25V
R1
0.3 ?
MJE210 OR
ZETEX ZTX789A
L1
V OUT
voltage can be higher or lower than the output voltage. A
level shift, provided by the PNP transistor, supplies proper
MAX
R2
220
polarity feedback information to the regulator.
L1 D1
C2
+
V IN
I L
SW1
R3
330
D1
1N5821
+
C1
+
C1
R1
+V OUT
LT1110
I LIM
V IN
2N3906
(
GND
SW2
FB
R4
R5
V OUT = 220mV
R4
1 + R5
)
+
C2
AO
LT1110
SW1
FB
GND
SW2
LT1110 ? TA16
Figure 6. Q1 Permits Higher-Current Switching.
–V IN
R2
V OUT =
( R1R2 ) 220mV + 0.6V
LT1110 ? TA04
LT1110 Functions as Controller.
Figure 8. Negative-to-Positive Converter
11
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