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| 型号： | MAX8720EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/31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
Table 1. Component Selection for
Table 2. Component Suppliers
Standard Applications
SUPPLIER
WEBSITE
COMPONENT
Input Voltage
Output Voltage
C IN Input Capacitor
C OUT Output Capacitor
N H High-Side MOSFET
N L Low-Side MOSFET
D L Schottky Rectifier
L1 Inductor
15A/300kHz
V IN = 7V to 24V
V OUT = 1.25V
(2) 10μF, 25V
TDK C3225X7R1E106M
AVX 12103D106M
Taiyo Yuden TMK325BJ106MM
(3) 470μF, 2.5V, 9m ? low-ESR
polymer capacitor
Sanyo 2R5TPE470M9
Siliconix SI7390DP
Siliconix SI7356DP
3A, 30V, 0.45V f
Nihon EC31QS03L
0.8μH, 20A, 4.9m ?
Sumida CDEP104-0R8MC-50
AVX
Central Semiconductor
Coiltronics
Fairchild Semiconductor
Kemet
Nihon
Panasonic
Sanyo
Siliconix (Vishay)
Sumida
Taiyo Yuden
TDK
TOKO
Table 3. K-Factor
www.avx.com
www.centralsemi.com
www.coiltronics.com
www.fairchildsemi.com
www.kemet.com
www.niec.co.jp
www.panasonic.com/industrial
www.secc.co.jp
www.vishay.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The quick-PWM control architecture is a pseudo-fixed-
frequency, constant-on-time, current-mode type with
voltage feed-forward (Figure 2). This architecture relies
on the output filter capacitor’s ESR to act as the cur-
TON SETTING
V CC
Open
REF
GND
TON FREQUENCY
(kHz)
200
300
550
1000
K-FACTOR (μs)
5 ±10
3.3 ±10
1.8 ±12.5
1.0 ±12.5
rent-sense resistor, so the output ripple voltage pro-
vides the PWM ramp signal. The control algorithm is
simple: the high-side switch on-time is determined sole-
ly by a one-shot whose period is inversely proportional
to input voltage and directly proportional to output volt-
age. Another one-shot sets a minimum off-time (400ns
typ). The on-time one-shot is triggered if the error com-
parator is low, the low-side switch current is below the
current-limit threshold, and the minimum off-time one-
shot has timed out.
On-Time One-Shot (TON)
The heart of the PWM core is the one-shot that sets the
high-side switch on-time. This fast, low-jitter, adjustable
one-shot includes circuitry that varies the on-time in
response to battery and output voltage. The high-side
switch on-time is inversely proportional to the battery
voltage as measured by the V+ input, and proportional
to the output voltage. This algorithm results in a nearly
constant switching frequency despite the lack of a
fixed-frequency clock generator. The benefits of a con-
stant switching frequency are twofold: first, the frequen-
cy can be selected to avoid noise-sensitive regions
such as the 455kHz IF band; second, the inductor rip-
ple-current operating point remains relatively constant,
resulting in easy design methodology and predictable
output voltage ripple.
On-Time = K (V OUT + 0.075V) / V IN
where K is set by the TON pin-strap connection and
0.075V is an approximation to accommodate the expect-
ed drop across the low-side MOSFET switch (Table 3).
The on-time one-shot has good accuracy at the operat-
ing points specified in the Electrical Characteristics
table (±10% at 200kHz and 300kHz, and ±12% at
550kHz and 1000kHz). On-times at operating points far
removed from the conditions specified in the Electrical
Characteristics table can vary over a wider range. For
example, the 1000kHz setting typically runs approxi-
mately 10% slower with inputs much greater than +5V
due to the very short on-times required.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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 |
| MAX8720EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX8720 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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