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参数资料
| 型号： | MAX1572ETC130+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.3V .8A 12TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.3V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
Pin Description
PIN
1
2
3, 5, 11
4
6
7
8
9
10
12
—
NAME
RESET
SS
GND
OUT
EN2
PGND
LX
BATT
EN1
ABATT
Exposed
Paddle
FUNCTION
Active-Low RESET Output. Open-drain output with internal 14k ? pullup to OUT. RESET is driven LOW in
shutdown.
Soft-Start Control. Connect a capacitor from SS to GND to set the soft-start time. Use a 1000pF or larger
capacitor to eliminate inrush current during startup. With greater than 10μF total output capacitance, increase
C SS to C OUT /10,000 for soft-start. In shutdown, SS is discharged internally with 100 ? to GND.
Ground. Connect all ground pins to the exposed paddle.
Output Sense Input. Connect to the output of the regulator. In shutdown, OUT is discharged internally with
14k ? to GND.
Enable/Mode Control Input 2. See Table 1.
Power Ground. Connect to exposed paddle.
Inductor Connection. LX is high impedance in shutdown.
Supply Voltage Input. Connect to a 2.6V to 5.5V source. Connect a 10μF ceramic capacitor from BATT to GND.
Enable/Mode Control Input 1. See Table 1.
Analog Supply Input. Connect to BATT through a 10 ? resistor. Connect a 0.1μF capacitor from ABATT to GND.
Exposed Paddle. Connect to GND and PGND.
Table 1. Mode Select Truth Table
MODE
Shutdown
EN1
0
EN2
0
Pulse group
Pulse skip
Forced PWM
0
1
1
1
0
1
EN2
EN1
MODE
SELECT
CURRENT
CLOCK
2MHz
ABATT
BATT
10 ?
0.1 μ F
INPUT
2.6V TO 5.5V
A zero represents EN_ being driven low or connected to GND.
SENSE
A 1 represents EN_ being driven high or connected to BATT.
SLOPE
COMP
PWM
CONTROL
LX
10 μ F
OUTPUT
0.75V TO 2.5V
800mA
2.2 μ H
Detailed Description
Figure 1 is the functional diagram.
MAX1572
PGND
C OUT
PWM Control Scheme
The MAX1572 uses a 2MHz fixed-frequency, pulse-
width-modulated (PWM), current-mode control scheme.
RESET
RESET
TIMER
170ms
REFERENCE
EA
OUT
GND
The heart of the current-mode PWM controller is an
open-loop comparator that compares the error amp
THERMAL
voltage-feedback signal against the sum of the ampli-
fied current-sense signal and the slope compensation
ramp. At each rising edge of the internal clock, the
internal high-side P-channel MOSFET turns on until the
SHUTDOWN
SS
1000pF
PWM comparator trips. During this on-time, current
ramps up through the inductor, sourcing current to the
Figure 1. Functional Diagram
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1572ETC130+ | 功能描述:直流/直流开关转换器 800mA 2MHz PWM Step-Down w/Reset RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1572ETC130+T | 功能描述:直流/直流开关转换器 800mA 2MHz PWM Step-Down w/Reset RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1572ETC130-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1572ETC150 | 功能描述:直流/直流开关转换器 800mA 2MHz PWM Step-Down w/Reset RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1572ETC150+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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