参数资料
| 型号： | LT1528CT |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/ADJ 3A TO220-5 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式和可调式 |
| 输出电压： | 3.3V，3.3 V ~ 14.15 V |
| 输入电压： | 3.9 V ~ 15 V |
| 电压 - 压降（标准）： | 0.57V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.2A |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 成形引线 |
| 供应商设备封装： | TO-220-5 |
| 包装： | 管件 |
LT1528
PIN FUNCTIONS
SHDN (Pin 4): This pin is used to put the device into
shutdown. In shutdown the output of the device is turned
off. This pin is active low. The device will be shut down if
the SHDN pin is actively pulled low. The SHDN pin current
with the pin pulled to ground will be 60μA. The SHDN pin
is internally clamped to 7V and – 0.6V (one V BE ). This al-
lows the SHDN pin to be driven directly by 5V logic or by
open collector logic with a pull-up resistor. The pull-up
resistor is only required to supply the leakage current of
the device is more than six inches away from the main
input ?lter capacitor. The LT1528 is designed to withstand
reverse voltages on the input pin with respect to ground
and the OUTPUT pin. In the case of reversed input, the
LT1528 will act as if there is a diode in series with its input.
There will be no reverse current ?ow into the LT1528 and
no reverse voltage will appear at the load. The device will
protect both itself and the load.
the open collector gate, normally several microamperes.
Pull-up current must be limited to a maximum of 5mA.
A curve of SHDN pin input current as a function of volt-
age appears in the Typical Performance Characteristics
section. If the SHDN pin is not used it can be left open
circuit. The device will be active output on if the SHDN
V IN
+
5
4
IN
SHDN
LT1528
GND
3
OUT
SENSE
1
2
R P
+
LOAD
pin is not connected.
V IN (Pin 5): Power is supplied to the device through the
input pin. The input pin should be bypassed to ground if
APPLICATIONS INFORMATION
R P
Figure 1. Kelvin Sense Connection
1528 F01
The LT1528 is a 3A low dropout regulator optimized for
microprocessor applications. Dropout voltage is only 0.6V
at 3A output current. With the SENSE pin shorted to the
OUTPUT pin, the output voltage is set to 3.3V. The device
operates with a quiescent current of 400μA. In shutdown,
the quiescent current drops to only 125μA. The LT1528
incorporates several protection features, including protec-
tion against reverse input voltages. If the output is held
at the rated output voltage when the input is pulled to
into the SENSE pin. The output voltage can be calculated
using the formula in Figure 2. The value of R1 should be
less than 330Ω to minimize errors in the output voltage
caused by the SENSE pin current. Note that in shutdown
the output is turned off and the divider current will be
zero. Curves of SENSE Pin Voltage vs Temperature and
SENSE Pin Current vs Temperature appear in the Typical
Performance Characteristics section.
ground, the LT1528 acts like it has a diode in series with
its output and prevents reverse current ?ow.
Adjustable Operation
V IN
5
4
IN
SHDN
LT1528
OUT
SENSE
1
2
R2
+
V OUT
) )
V OUT = 3.3V 1 + + (I SENSE )(R2)
The LT1528 can be used as an adjustable regulator with
an output voltage range of 3.3V to 14V. The output voltage
is set by the ratio of two external resistors as shown in
Figure 2. The device servos the output voltage to maintain
the voltage at the SENSE pin at 3.3V. The current in R1
is then equal to 3.3V/R1. The current in R2 is equal to
the sum of the current in R1 and the SENSE pin current.
GND
3
R2
R1
V SENSE = 3.3V
I SENSE = 130μA AT 25°C
OUTPUT RANGE = 3.3V TO 14V
R1
1528 F02
The SENSE pin current, 130μA at 25°C, ?ows through R2
Figure 2. Adjustable Operation
1528fb
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1528CT#PBF | 功能描述:IC REG LDO 3.3V/ADJ 3A TO220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LT1528CTPBF | 制造商:Linear Technology 功能描述:LDO Regulator 3.3V 3A Fast TO220-5 |
| LT1529 | 制造商:Linear Technology 功能描述: |
| LT1529-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown |
| LT1529-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown |
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