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参数资料
| 型号： | MAX1714BEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
High-Speed Step-Down Controller
for Notebook Computers
Table 3. Operating Mode Truth Table
SHDN
0
1
1
SKIP
X
Below
AGND
V CC
DL
High
Switching
Switching
MODE
Shutdown
No Fault
Run (PWM),
Low Noise
COMMENTS
Low-power shutdown state. DL is forced to V DD , enforcing OVP. I CC < 1μA typ.
Test mode with OVP, UVP, and thermal faults disabled and latches cleared. Otherwise
normal operation, with automatic PWM/PFM switchover for pulse skipping at light loads
(Figure 6).
Low-noise operation with no automatic switchover. Fixed-frequency PWM action is
forced regardless of load. Inductor current reverses at light load levels. Low noise,
high I Q .
1
AGND Switching
Run
(PFM/PWM)
Normal operation with automatic PWM/PFM switchover for pulse skipping at light loads.
Best light-load efficiency.
Fault latch has been set by OVP, output UVLO, or thermal shutdown. Device will remain
1
X
High
Fault
in FAULT mode until V CC power is cycled, SKIP is forced below ground (Figure 6), or
SHDN is toggled.
2) Maximum load current . There are two values to con-
sider. The peak load current (I LOAD(MAX) ) determines
the instantaneous component stresses and filtering
requirements, and thus drives output capacitor selec-
tion, inductor saturation rating, and the design of the
current-limit circuit. The continuous load current
(I LOAD ) determines the thermal stresses and thus dri-
ves the selection of input capacitors, MOSFETs, and
other critical heat-contributing components. Modern
notebook CPUs generally exhibit:
I LOAD = I LOAD(MAX) · 80%
3) Switching frequency . This choice determines the
basic trade-off between size and efficiency. The opti-
mal frequency is largely a function of maximum input
voltage, due to MOSFET switching losses that are
proportional to frequency and V IN2 . The optimum fre-
quency is also a moving target, due to rapid improve-
ments in MOSFET technology that are making higher
frequencies more practical (Table 4).
4) Inductor operating point . This choice provides
trade-offs between size vs. efficiency. Low inductor
values cause large ripple currents, resulting in the
smallest size, but poor efficiency and high output rip-
ple. The minimum practical inductor value is one that
causes the circuit to operate at the edge of critical
conduction (where the inductor current just touches
zero with every cycle at maximum load). Inductor val-
ues lower than this grant no further size-reduction
benefit.
The MAX1714’s pulse-skipping algorithm initiates skip
mode at the critical conduction point. So, the inductor
operating point also determines the load-current value
at which PFM/PWM switchover occurs.
MAX1714
(GND)
AGND
SKIP
APPROXIMATELY
-0.65V
1.5mA
V FORCE
These four factors impact the component selection
process. Selecting components and calculating their
effect on the MAX1714’s operation is best done with a
spreadsheet. Using the formulas provided, calculate the
LIR (the ratio of the inductor ripple current to the
designed maximum load current) for both the minimum
and maximum input voltages. Maintaining an LIR within a
20% to 50% range is prudent. The use of a spreadsheet
allows quick evaluation of component selection.
( ) ARE FOR THE MAX1714B ONLY.
Figure 6. Disabling Over/Undervoltage Protection
(No-Fault Test Mode)
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1714BEEE+ | 功能描述:电流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE+T | 功能描述:电流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1714BEVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX1714B RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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