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参数资料
| 型号： | MAX17082GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 46/48页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器， Intel IMVP-6+，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controllers for
IMVP-6+/IMVP-6.5 CPU Core Power Supplies
?+
V IN ( MIN ) = 2 × ?
?+
V IN ( MIN ) = 2 × ?
V FB - V DROOP + V DIS
? ? 1 - η TOTAL OF F ( MIN ) f SW ? ?
V IN ( MIN ) = η TOTAL ? ? +
Minimum Input-Voltage Requirements
and Dropout Performance
The output-voltage-adjustable range for continuous-
conduction operation is restricted by the nonadjustable
minimum off-time one-shot and the number of phases.
For best dropout performance, use the slower (200kHz)
on-time settings. When working with low input voltages,
the duty-factor limit must be calculated using worst-
case values for on- and off-times. Manufacturing toler-
ances and internal propagation delays introduce an
error to the on-times. This error is greater at higher fre-
quencies. Also, keep in mind that transient-response
performance of buck regulators operated too close to
dropout is poor, and bulk output capacitance must
often be added (see the V SAG equation in the
Multiphase Quick-PWM Design Procedure section.
The absolute point of dropout is when the inductor cur-
rent ramps down during the minimum off-time ( Δ I DOWN )
as much as it ramps up during the on-time ( Δ I UP ). The
ratio h = Δ I UP / Δ I DOWN is an indicator of the ability to
slew the inductor current higher in response to
increased load, and must always be greater than 1. As
h approaches 1, the absolute minimum dropout point,
the inductor current cannot increase as much during
each switching cycle and V SAG greatly increases
unless additional output capacitance is used.
A reasonable minimum value for h is 1.5, but adjusting
this up or down allows tradeoffs between V SAG , output
capacitance, and minimum operating voltage. For a
given value of h, the minimum operating voltage can be
calculated as:
? ?
h × t
V CHG - V DIS + V DROOP
where η TOTAL is the total number of out-of-phase
switching regulators, V FB is the voltage-positioning
droop, V DIS and V CHG are the parasitic voltage drops
in the discharge and charge paths (see the On-Time
One-Shot section), t OFF(MIN) is from the Electrical
Characteristics table. The absolute minimum input volt-
age is calculated with h = 1.
If the calculated V IN(MIN) is greater than the required
minimum input voltage, then reduce the operating fre-
quency or add output capacitance to obtain an accept-
able V SAG . If operation near dropout is anticipated,
calculate V SAG to be sure of adequate transient
response.
Dropout design example:
V FB = 1.4V
f SW = 300kHz
t OFF(MIN) = 400ns
V DROOP = 3mV/A x 30A = 90mV
V DIS = V CHG = 150mV (30A Load)
h = 1.5 and η TOTAL = 2:
? 1 . 4 V - 90 mV + 150 mV ?
? 1 - 2 × ( 0 . 4 μs × 1 . 5 × 3 00 kHz ) ?
150 mV - 150 mV + 90 mV = 4 . 96 V
Calculating again with h = 1 gives the absolute limit of
dropout:
? 1 . 4 V - 90 mV + 150 mV ?
? 1 - 2 × ( 0 . 4 μs × 1 . 0 × 3 00 kHz ) ?
150 mV - 150 mV + 90 mV = 4 . 07 V
Therefore, V IN must be greater than 4.1V, even with very
large output capacitance, and a practical input voltage
with reasonable output capacitance would be 5.0V.
Applications Information
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and clean, stable operation. The switching
power stage requires particular attention. If possible,
mount all the power components on the top side of the
board with their ground terminals flush against one
another. Refer to the MAX17082 evaluation kit specifi-
cation for a layout example and follow these guidelines
for good PCB layout:
? Keep the high-current paths short, especially at the
ground terminals. This is essential for stable, jitter-
free operation.
? Connect all analog grounds to a separate solid cop-
per plane, which connects to the GND pin of the
Quick-PWM controller. This includes the V CC , FB,
and GNDS bypass capacitors.
? Keep the power traces and load connections short.
This is essential for high efficiency. The use of thick
copper PCBs (2oz vs. 1oz) can enhance full-load
efficiency by 1% or more. Correctly routing PCB
traces is a difficult task that must be approached in
terms of fractions of centimeters, where a single m Ω
of excess trace resistance causes a measurable
efficiency penalty.
46
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17083ETG+ | 功能描述:直流/直流开关调节器 Low-Voltage Internal Switch Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX17083ETG+T | 功能描述:直流/直流开关调节器 Low-Voltage Internal Switch Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX17083EVKIT+ | 功能描述:电源管理IC开发工具 Low-Voltage Internal Switch Step-Down RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17085BETL+ | 功能描述:电池管理 Dual Main Step-Down Controller RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17085BETL+T | 功能描述:电池管理 Dual Main Step-Down Controller RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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