- 您现在的位置：买卖IC网 > PDF目录5131 > MAX8720EEI+ (Maxim Integrated Products)IC CNTRL VID STP DWN 28-QSOP PDF资料下载
参数资料
| 型号： | MAX8720EEI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/31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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
Dynamically Adjustable 6-Bit VID
Step-Down Controller
R1
10 ?
+5V BIAS
VID0
VID1
VID2
R2 TO R7
(6) 100k ?
C2
1 μ F
V CC
AGND*
D0
D1
MAX8720
D2
V DD
V+
BST
DH
LX
D BST
C BST
0.1 μ F
N H
C1
1 μ F
C IN
(2) 10 μ F
L1
0.8 μ H
INPUT (V IN )
7V TO 28V
OUTPUT
(V OUT )
VID3
VID4
D3
D4
DL
*PGND
N L
D L
C OUT
(3) 470 μ F
VID5
D5
+5V BIAS
R8
100k ?
4-LEVEL
SUSPEND
INPUTS
OPEN (300kHz)
S0
S1
TON
FB
FBS
GNDS
V CPU_SENSE
V GND_SENSE
CONNECT TO REMOTE-
SENSE POINTS
PGOOD
PWM
ON
SKIP
OFF
PGOOD
SUS
SKIP
SHDN
CC
REF
C CC
47pF
R ILIM1
100k ?
C REF
0.22 μ F
R TIME
100k ?
TIME
ILIM
R ILIM2
33.2k ?
*FOR THE MAX8720EEI, AGND AND PGND
REFER TO A SINGLE PIN DESIGNATED GND
Figure 1. MAX8720 Standard Application Circuit
Detailed Description
The MAX8720 is a constant-on-time, quick-PWM con-
troller with 6-bit VID inputs to dynamically set the output
voltage from 0.275V to 1.85V. The MAX8720 standard
application circuit (Figure 1) generates a low-voltage
1.25V/15A output typical of low-power CPU and GPU
core supplies in a notebook computer. The input sup-
ply range is 7V to 24V. See Table 1 for component
selections and Table 2 for component manufacturers.
5V Bias Supply (V CC and V DD )
The MAX8720 requires an external 5V bias supply in
addition to the battery. Typically, this 5V bias supply is
the notebook ’s 95%-efficient, 5V system supply.
Keeping the bias supply external to the IC improves
efficiency and eliminates the cost associated with the
5V linear regulator that would otherwise be needed to
supply the PWM circuit and gate drivers. If stand-alone
capability is needed, the 5V supply can be generated
with an external linear regulator.
The 5V bias supply must provide V CC (PWM controller)
and V DD (gate-drive power), so the maximum current
drawn is:
I BIAS = I CC + f SW (Q G(LOW) + Q G(HIGH) )
= 4mA to 40mA (typ)
where I CC is 800μA (typ), f SW is the switching frequency,
and Q G(LOW) and Q G(HIGH) are the MOSFET data
sheet’s total gate-charge specification limits at V GS = 5V.
V+ and V DD can be connected together if the input power
source is a fixed 4.5V to 5.5V supply. If the 5V bias supply
is powered up prior to the battery supply, the enable sig-
nal ( SHDN going from low to high) must be delayed until
the battery voltage is present to ensure startup.
Reference (REF)
The 2V reference is accurate to ±0.75% over tempera-
ture and load, making REF useful as a precision system
reference. Bypass REF to GND with a 0.22μF or greater
ceramic capacitor. The reference sources up to 100μA
and sinks 10μA to support external loads. Loading the
reference reduces the output voltages slightly, because
of the reference load regulation error.
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| GEC50DRXH-S734 | CONN EDGECARD 100PS DIP .100 SLD |
| 4564-682K | INDUCTOR RF 6.8mH 10% RADIAL |
| GCC19DRTS-S734 | CONN EDGECARD 38POS DIP .100 SLD |
| 4564-562K | INDUCTOR RF 5.6mH 10% RADIAL |
| MAX17004ETJ+ | IC PS CTRLR FOR NOTEBOOKS 32TQFN |
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 |
发布紧急采购，3分钟左右您将得到回复。