参数资料
型号: LTC3814IFE-5#TRPBF
厂商: Linear Technology
文件页数: 18/30页
文件大小: 0K
描述: IC REG CTRLR BST PWM CM 16-TSSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1MHz
占空比: 90%
电源电压: 4.5 V ~ 55 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 带卷 (TR)
LTC3814-5
APPLICATIONS INFORMATION
Using the INTV CC Regulators
One, both or neither of these regulators can be used to
generate the 5.5V IC/driver supply depending on the
circuit requirements, available supplies, and the voltage
range of V IN or V OUT . Deriving the 5.5V supply from V IN
is more ef?cient, however deriving it from V OUT has the
advantage of maintaining regulation of V OUT when V IN
drops below the UV threshold. Four possible con?gurations
are shown in Figures 9a through 9d, and are described
as follows:
1. Figure 9a. If the V IN voltage or another low voltage
supply between 4.5V and 14V is available, the sim-
plest approach is to connect this supply directly to the
INTV CC and DRV CC pins. The internal regulators are
disabled by shorting NDRV and EXTV CC to INTV CC .
2. Figure 9b. If V IN(MAX) > 14V, an external NMOS con-
nected to the NDRV pin can be used to generate 5.5V
from V IN . V IN(MIN) must be > 4.5V + R NDRV ? 40μA + V T
NDRV
to keep INTV CC above the UV threshold and the BV DSS
of the external NMOS must be chosen to be greater
than V IN(MAX) . The EXTV CC regulator is disabled by
grounding the EXTV CC pin.
3. Figure 9c. If the V IN(MAX) < 14.7V and V IN is allowed to
fall below 4.2V without disrupting the boost converter
operation, use this con?guration. The INTV CC supply
is derived from V IN until the V OUT > 4.7V. Once INTV CC
is derived from V OUT , V IN can fall below the 4V UV
threshold without losing regulation of V OUT . Note that
in this con?guration, V IN must be > ~5V at least long
enough to start up the LTC3814-5 and charge V OUT >
4.7V. Also, since V OUT is connected to the EXTV CC pin,
this con?guration is limited to V OUT < 15V.
4. Figure 9d. Similar to con?guration 3 except that V OUT
is allowed to be >15V since V OUT is connected to an
external NMOS with appropriately rated BV DSS . V IN has
same start-up requirement as 3.
V IN
R NDRV
NDRV
INTV CC
LTC3814-5
+
+
4.5V to
14V
INTV CC
LTC3814-5
+
5.5V
EXTV CC
EXTV CC
(a) 4.2V to 14V
Supply Available
NDRV
V IN < 14.7V
(b) INTV CC from V IN ,
V IN > 14V
NDRV
R NDRV
V OUT
V IN < 14.7V
INTV CC
+
5.5V
INTV CC
+
5.5V
LTC3814-5
LTC3814-5
EXTV CC
(c) INTV CC from V OUT ,
V OUT ≤ 15V
V OUT ≤ 15V
EXTV CC
(d) INTV CC from V OUT ,
V OUT > 15V
38145 F09
Figure 9. Four Possible Ways to Generate INTV CC Supply
38145fc
18
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