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参数资料
| 型号： | MAX1973 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Smallest 1A, 1.4MHz Step-Down Regulators |
| 中文描述： | 尺寸最小的1A、1.4MHz降压型稳压器 |
| 文件页数： | 8/15页 |
| 文件大小： | 331K |
| 代理商： | MAX1973 |
M
Smallest 1A, 1.4MHz Step-Down Regulators
8
_______________________________________________________________________________________
Pin Description
NAME
PIN
MAX1973
MAX1974
FUNCTION
1
FBSEL
FBSEL
Feedback-Mode Selector. Connect FBSEL to GND to set the output voltage to 1.8V
(MAX1973) or 1V (MAX1974). Connect FBSEL to IN to set the output voltage to 2.5V
(MAX1973) or 1.5V (MAX1974). Leave FBSEL unconnected to set the output voltage
using a resistor-divider at FB.
Compensation. Connect a series RC network to GND. COMP is internally pulled to
GND when the device is in shutdown or in undervoltage lockout (see the
Compen-
sation Components
section).
2
COMP
COMP
3
FB
FB
Feedback Input. Connect to the output if a preset voltage is used, or to a resistor-
divider from the output to GND for an adjustable output voltage.
4
SS
SS
Soft-Start Pin and Reference Output. Bypass to GND with at least 0.01μF. Connect
0.1μF to GND for a soft-start ramp time of 6.25ms for the MAX1973, or 3.75ms for the
MAX1974. SS is internally pulled to GND when the device is shut down or in
undervoltage lockout.
Ground
Control Input 2. Controls enable/disable and voltage margining (see Table 1).
Power-OK Output. Open-drain output goes low when output is below 90% of nominal
output. POK is also low when the device is shut down or in undervoltage lockout.
Power Ground
Inductor Connection. Connect an inductor from LX to the output.
Input Supply Voltage. Input voltage range is 2.6V to 5.5V. Connect a 4.7μF capacitor
from IN to PGND.
Control Input 1. Controls Enable/Disable and voltage margining (see Table 1).
5
GND
CTL2
GND
—
6
—
POK
7
8
PGND
LX
PGND
LX
9
IN
IN
CTL1
—
10
—
ON
Enable Input. Connect to IN or drive high for normal operation. Drive low to put device
in shutdown.
MAX1974 WITH 100k
PULLUP RESISTOR
FROM POK TO IN, I
LOAD
= 100mA
MAX1974
POK AND INPUT VOLTAGE
V
POK
2V/div
0
20ms/div
V
IN
1V/div
V
OUT
2V/div
0
0
V
IN
= 5V, VOUT = 2.5V, I
OUT
= 800mA, -4% TO +4% TO -4%
MAX1973
VOLTAGE MARGIN STEP CHANGE RESPONSE
V
OUT
I
IN
1V/div
0
500mA/div
1ms/div
V
CTL1
V
CTL2
0
10V/div
0
10V/div
0
Typical Operating Characteristics (continued)
(Circuits of Figure 2, 3, and 4; T
A
= +25
°
C, unless otherwise noted.)
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1973EUB | Smallest 1A, 1.4MHz Step-Down Regulators |
| MAX1974EUB | Smallest 1A, 1.4MHz Step-Down Regulators |
| MAX1976ETT-T | Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN |
| MAX1976EZT-T | Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN |
| MAX1978 | Integrated Temperature Controllers for Peltier Modules |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1973EUB | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1973EUB+ | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1973EUB+T | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1973EUB-T | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1973EVKIT | 功能描述:直流/直流开关调节器 Evaluation Kit for the MAX1973 MAX1974 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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