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参数资料
| 型号： | MAX1572ETC075 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET |
| 中文描述： | 2.1 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, QCC12 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220WGGB, TQFN-12 |
| 文件页数： | 7/11页 |
| 文件大小： | 340K |
| 代理商： | MAX1572ETC075 |
M
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with
RESET
_______________________________________________________________________________________
7
Detailed Description
Figure 1 is the functional diagram.
PWM Control Scheme
The MAX1572 uses a 2MHz fixed-frequency, pulse-
width-modulated (PWM), current-mode control scheme.
The heart of the current-mode PWM controller is an
open-loop comparator that compares the error amp
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
PWM comparator trips. During this on-time, current
ramps up through the inductor, sourcing current to the
Pin Description
PIN
NAME
FUNCTION
1
RESET
Active-Low
RESET
Output. Open-drain output with internal 14k
pullup to OUT.
RESET
is driven LOW in
shutdown.
2
SS
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.
3, 5, 11
GND
Ground. Connect all ground pins to the exposed paddle.
4
OUT
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.
S up p y V ol ag e Inp ut. C onnect to a 2.6V to 5.5V sour ce. C onnect a 10μF cer am c cap aci or fr om BATT to G N D
Enable/Mode Control Input 1. See Table 1.
Anal og S up p y Inp ut. C onnect to BATT thr oug h a 10
r esi stor C onnect a 0.1μF cap aci or fr om ABATT to GN D
6
7
8
9
10
12
EN2
PGND
LX
BATT
EN1
ABATT
—
Exposed
Paddle
Exposed Paddle. Connect to GND and PGND.
Table 1. Mode Select Truth Table
MODE
EN1
0
0
1
1
EN2
0
1
0
1
Shutdown
Pulse group
Pulse skip
Forced PWM
A zero represents EN_ being driven low or connected to GND.
A 1 represents EN_ being driven high or connected to BATT.
BATT
CLOCK
2MHz
PWM
CONTROL
ABATT
LX
10
0.1
μ
F
10
μ
F
2.2
μ
H
C
OUT
PGND
GND
OUT
SS
EA
RESET
THERMAL
SHUTDOWN
REFERENCE
OUTPUT
0.75V TO 2.5V
800mA
INPUT
2.6V TO 5.5V
MAX1572
1000pF
SLOPE
COMP
RESET
TIMER
170ms
EN1
EN2
CURRENT
SENSE
MODE
SELECT
Figure 1. Functional Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1572ETC075+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1572ETC130 | 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 |
| 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 |
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