参数资料
| 型号： | LT1936HMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.4A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 31.3 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT1936
APPLICATIONS INFORMATION
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1% resis-
tors according to:
Inductor Selection and Maximum Output Current
A good ?rst choice for the inductor value is
L = 2.2 (V OUT + V D )
R1 = R2
V OUT
1.200
–1
where V D is the voltage drop of the catch diode (~0.4V)
and L is in μH. With this value the maximum output cur-
rent will be above 1.2A at all duty cycles and greater than
R2 should be 20k or less to avoid bias current errors.
Reference designators refer to the Block Diagram.
Input Voltage Range
The input voltage range for LT1936 applications depends
on the output voltage and the Absolute Maximum Ratings
of the V IN and BOOST pins.
The minimum input voltage is determined by either the
LT1936’s minimum operating voltage of ~3.45V or by its
maximum duty cycle. The duty cycle is the fraction of
1.4A for duty cycles less than 50% (V IN > 2 V OUT ). The
inductor’s RMS current rating must be greater than the
maximum load current and its saturation current should be
about 30% higher. For robust operation in fault conditions
(start-up or short circuit) and high input voltage (>30V),
the saturation current should be above 2.6A. To keep the
ef?ciency high, the series resistance (DCR) should be less
than 0.1Ω, and the core material should be intended for
high frequency applications. Table 1 lists several vendors
and suitable types.
Table 1. Inductor Vendors
time that the internal switch is on and is determined by
the input and output voltages:
VENDOR
Murata
URL
www.murata.com
PART SERIES
LQH55D
TYPE
Open
V IN SW D
DC =
V OUT + V D
– V + V
TDK
Toko
www.component.tdk.com
www.toko.com
SLF7045
SLF10145
D62CB
Shielded
Shielded
Shielded
D63CB
Shielded
where V D is the forward voltage drop of the catch diode
(~0.5V) and V SW is the voltage drop of the internal switch
(~0.5V at maximum load). This leads to a minimum input
voltage of:
Sumida
www.sumida.com
D75C
D75F
CR54
CDRH74
CDRH6D38
Shielded
Open
Open
Shielded
Shielded
V IN ( MIN ) =
V OUT + V D
DC MAX
– V D + V SW
CR75 Open
Of course, such a simple design guide will not always
V IN ( MAX ) =
– V D SW
V OUT + V D
with DC MAX = 0.87.
The maximum input voltage is determined by the absolute
maximum ratings of the V IN and BOOST pins and by the
minimum duty cycle DC MIN = 0.08:
+ V
DC MIN
Note that this is a restriction on the operating input voltage;
the circuit will tolerate transient inputs up to the absolute
maximum ratings of the V IN and BOOST pins.
result in the optimum inductor for your application. A
larger value provides a slightly higher maximum load
current and will reduce the output voltage ripple. If your
load is lower than 1.2A, then you can decrease the value
of the inductor and operate with higher ripple current. This
allows you to use a physically smaller inductor, or one
with a lower DCR resulting in higher ef?ciency. Be aware
that if the inductance differs from the simple rule above,
then the maximum load current will depend on input volt-
age. There are several graphs in the Typical Performance
Characteristics section of this data sheet that show the
maximum load current as a function of input voltage and
inductor value for several popular output voltages. Low
1936fd
8
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