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| 型号： | MAX8720EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/31页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL VID STP DWN 28-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，CPU GPU |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.28 V ~ 1.85 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-QSOP |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
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Dynamically Adjustable 6-Bit VID
Step-Down Controller
Pin Description
PIN
28 QSOP
36 THIN
QFN
NAME
FUNCTION
Battery Voltage-Sense Connection. Connect V+ to input power source. V+ is used only
1
33
V+
for PWM one-shot timing. DH on-time is inversely proportional to input voltage over a 2V
to 28V range.
Shutdown Control Input. Connect SHDN to V CC for normal operation. Connect SHDN to
2
34
SHDN
GND to put the controller into its shutdown state. Forcing SHDN to 12V to 15V disables
both the overvoltage-protection and undervoltage-protection circuits and clears the fault
latch. Do not connect SHDN to >15V.
Slew-Rate Adjustment Pin. Connect a resistor from TIME to GND to set the internal slew-
3
35
TIME
rate clock. A 470k ? to 22k ? resistor sets the clock from 38kHz to 818kHz, f SLEW =
150kHz x 120k ? / R TIME . To reduce inrush current, f SLEW = 150kHz x 120k ? / 4 x R TIME
during power-up and power-down transient.
4
1
FB
Fast Feedback Input. Connect FB to the junction of the external inductor and output-
capacitor node (Figure 1).
Feedback Remote-Sense Input. For nonvoltage-positioned circuits, connect FBS to V OUT
directly at the load. FBS internally connects to the integrator that fine tunes the DC output
5
2
FBS
voltage. For voltage-positioned circuits, connect FBS directly to FB near the IC to disable the
FBS remote-sense integrator amplifier. To disable all three integrator amplifiers, connect FBS
to V CC .
6
3
CC
Integrator Capacitor Connection. Connect a 47pF to 1000pF (47pF typ) capacitor from CC to
AGND to set the integration time constant. CC can be left open if FBS is connected to V CC .
Suspend-Mode Voltage-Select Input. S0 and S1 are four-level digital inputs that select the
7, 8
4, 5
S0, S1
suspend-mode VID code for the suspend-mode multiplexer inputs. If SUS is high, the
suspend-mode VID code is delivered to the DAC.
9
7
V CC
Analog Supply Input. Connect to the system supply voltage (+4.5V to +5.5V) through a series
10 ? resistor. Bypass V CC to analog ground with a 1μF or greater ceramic capacitor.
On-Time Selection Control Input. This is a four-level input that sets the K-factor to
determine DH on-time. Connect TON to the following pins for the indicated operation:
10
8
TON
GND = 1000kHz
REF = 550kHz
Open = 300kHz
V CC = 200kHz
2.0V Reference Voltage Output. Bypass REF to analog ground with a 0.22μF or greater
11
9
REF
ceramic capacitor. The reference can source up to 50μA for external loads. Loading REF
degrades output voltage accuracy according to the REF load regulation error.
Current-Limit Adjustment. The PGND–LX current-limit threshold defaults to 100mV if ILIM
is connected to V CC . In adjustable mode, the current-limit threshold voltage is 1/10th the
12
10
ILIM
voltage seen at ILIM over a 0.5V to 3.0V range. The logic threshold for switchover to the
100mV default value is approximately V CC - 1V. Connect ILIM to REF for a fixed 200mV
threshold.
10
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相关代理商/技术参数 |
参数描述 |
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| MAX8720ETX | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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| MAX8720ETX+T | 功能描述:DC/DC 开关控制器 Dyn Adj 6-Bit VID Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8720ETX-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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