参数资料
型号: LTC1574CS#PBF
厂商: Linear Technology
文件页数: 4/8页
文件大小: 0K
描述: IC REG BUCK INV ADJ 16SOIC
标准包装: 50
类型: 降压(降压),反相
输出类型: 可调式
输出数: 1
输出电压: 可调
输入电压: 4 V ~ 18.5 V
PWM 型: 电流模式,混合
频率 - 开关: 最高 200kHz
电流 - 输出: 340mA,600mA
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 16-SOIC
产品目录页面: 1333 (CN2011-ZH PDF)
LTC1574
LTC1574-3.3/LTC1574-5
PI FU CTIO S
NC (Pins 1, 8, 9, 16): No Connection.
GND (Pins 2, 4, 13, 15): Ground.
SW (Pins 3, 14): Drain of P-Channel MOSFET Switch and
Cathode of Schottky Diode.
V IN (Pin 5): Input Supply Voltage. It must be decoupled
close to ground (Pin 4).
I PGM (Pin 6): This pin selects the current limit of the
P-channel switch. With I PGM = V IN , the current trip point is
600mA and with I PGM = 0V, the current trip point is
reduced to 340mA.
SHDN (Pin 7): Pulling this pin to ground keeps the internal
switch off and puts the LTC1574 in micropower shutdown.
APPLICATIO S I FOR ATIO
Operating Frequency and Inductor
Since the LTC1574 utilizes a constant off-time architecture,
its operating frequency is dependent on the value of V IN . The
frequency of operation can be expressed as:
V OUT or V FB (Pin 10): For the LTC1574, this pin connects
to the main voltage comparator input. On the LTC1574-5
and LTC1574-3.3, this pin goes to an internal resistive
divider which sets the output voltage.
LB OUT (Pin 11): Open drain of an N-Channel Pull-Down.
This pin will sink current when (Pin 12) LB IN goes below
1.25V.
LB IN (Pin 12): The (–) Input of the Low-Battery Voltage
Comparator. The (+) input is connected to a reference
voltage of 1.25V.
I PGM pin, the limit is either set to 340mA or 600mA. In
addition, the off-time of the switch is increased to allow the
inductor current to decay far enough to prevent any current
build-up (see Figure 1).
t OFF ? V IN + V D ?
f =
1 ? V IN ? V OUT ?
? ?
( Hz )
where t OFF = 4 μ s and V D is the voltage drop across the
internal Schottky diode. Note that the operating frequency
is a function of the input and output voltage.
Although the size of the inductor does not affect the fre-
I PGM = V IN
I PGM = 0
quency or inductor peak current, it does affect the ripple
current. The peak-to-peak ripple current is given by:
GND
I RIPPLE = 4 ? 10 ? 6 ? OUT D ?
? V + V ?
? L ?
( A P-P )
L = 100 μ H
V IN = 13.5V
20 μ s/DIV
1574 ? F01
When choosing a small inductor, core loss will increase due
to higher ripple current. Therefore, a low ESR output
capacitor has to be used.
Short-Circuit Protection
The LTC1574 is protected from output short circuits by its
internal current limit. Depending on the condition of the
4
Figure 1. Inductor Current with Output Shorted
Low-Battery Detector
The low-battery indicator senses the input voltage through
an external resistive divider. This divided voltage connects
to the “–” input of a voltage comparator (Pin 12) which is
compared with a 1.25V reference voltage. With the current
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