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参数资料
| 型号： | MAX8720EEI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/31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： | 50 |
| 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： | 管件 |
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Dynamically Adjustable 6-Bit VID
Step-Down Controller
V CC(UVLO)
V CC
DL
V CC
DL
MODE
SHDN
PGOOD
V CPU
FORCED-PWM MODE
SOFT-STARTUP AND SHUTDOWN
1/4TH SLEW RATE SET BY R TIME
FORCED-PWM MODE
PWM
SHDN
PGOOD
V CPU
8x R TIME
CLOCKS
Figure 6. Soft-Startup and Soft-Shutdown
Soft-Startup and Soft-Shutdown ( SHDN )
When SHDN goes low, the MAX8720 enters low-power
shutdown mode. PGOOD goes low immediately. The
output voltage ramps down to 0V in 25mV steps at
1/4th the clock rate set by R TIME . The slow rampdown
of the output voltage results in smaller negative induc-
tor currents, eliminating negative voltages on the out-
D0
D1
D2
D3
D4
D5
6-BIT
CODE
0
SUS MUX
OUT
DAC
put. When the DAC reaches the 0V setting, DL goes
high, DH goes low, the reference is turned off, and the
supply current drops to approximately 10μA.
6-BIT
CODE
1
When SHDN goes high, the reference powers up, and
after the reference UVLO is passed, the DAC target is
evaluated and switching begins. The slew-rate controller
S0
S1
S0/S1
DECODER
IN OUT
SEL
ramps up from 0V in 25mV steps at 1/4th the clock rate
set by R TIME to the currently selected code value
(based on SUS). Full output current is available immedi-
ately. PGOOD goes high after the slew-rate controller
has terminated and the output voltage is in regulation.
Nominal Output Voltage Setting
The MAX8720 uses a multiplexer that selects from two
different inputs (Figure 7)—the VID DAC inputs or the
suspend-mode S0, S1 inputs. On startup, the MAX8720
slews the target voltage from ground to either the
decoded D0–D5 (SUS = low) voltage or the S0, S1 volt-
age (SUS = high).
SUS
Figure 7. Internal Multiplexers Functional Diagram
DAC Inputs (D0–D5)
The digital-to-analog converter (DAC) programs the out-
put voltage. It typically receives a preset digital code
from the CPU pins, which are either hardwired to GND
or left open-circuit. They can also be driven by digital
logic, general-purpose I/O, or an external mux. Do not
leave D0–D5 floating—use 1M ? or less pullup resistors
if the inputs may float. D0–D5 can be changed while the
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8720EEI+ | 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 |
| MAX8720EEI+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 |
| MAX8720EEI-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 |
| 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 |
| MAX8720ETX+ | 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 |
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