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参数资料
| 型号： | MAX17083ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 5A 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 2.7 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
Low-Voltage, Internal Switch,
Step-Down Regulator
? f OSC ON ( MIN ) ?
For the MAX17083 system (IN) supply, ceramic capaci-
tors are preferred due to their resilience to inrush surge
currents typical of systems, and due to their low para-
sitic inductance, which helps reduce the high-frequen-
cy ringing on the IN supply when the internal MOSFETs
are turned off. Choose an input capacitor that exhibits
less than +10°C temperature rise at the RMS input cur-
rent for optimal circuit longevity.
BST Capacitors
The boost capacitor (C BST ) must be selected large
enough to handle the gate charging requirements of
the high-side MOSFETs. For these low-power applica-
tions, 0.1μF ceramic capacitors work well.
Applications Information
Duty-Cycle Limits
Minimum Input Voltage
The minimum input operating voltage (dropout voltage)
is restricted by the maximum duty-cycle specification
(see the Electrical Characteristics table). For the best
dropout performance, use the slowest switching fre-
quency setting (FREQ = GND). However, keep in mind
that the transient performance gets worse as the step-
Operation above this maximum input voltage results in
pulse skipping to avoid overcharging the output. At the
beginning of each cycle, if the output voltage is still
above the feedback threshold voltage, the controller
does not trigger an on-time pulse, effectively skipping a
cycle. This allows the controller to maintain regulation
above the maximum input voltage, but forces the con-
troller to effectively operate with a lower switching fre-
quency. This results in an input threshold voltage at
which the controller begins to skip pulses (V IN(SKIP) ):
? 1 ?
V IN ( SKIP ) = V OUT ? ?
t
where f OSC is the switching frequency selected by FREQ.
PCB Layout Guidelines
Careful PCB layout is critical to achieving 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.
Follow the MAX17083 Evaluation Kit layout and use the
following guidelines for good PCB layout:
down regulators approach the dropout voltage, so bulk
output capacitance must be added (see the voltage
sag and soar equations in the SMPS Design Procedure
section). The absolute point of dropout occurs when the
inductor current ramps down during the off-time
( Δ I DOWN ) as much as it ramps up during the on-time
( Δ I UP ). This results in a minimum operating voltage
defined by the following equation:
?
?
Keep the high-current paths short, especially at the
ground terminals. This practice is essential for sta-
ble, jitter-free operation.
Keep the power traces and load connections short.
This practice is essential for high efficiency. Using
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
V IN ( MIN ) = V OUT + V CHG + h ?
- 1 ? ( V OUT + V DIS )
?
?
1
D MAX
?
?
approached in terms of fractions of centimeters,
where a single milliohm of excess trace resistance
causes a measurable efficiency penalty.
where V CHG and V DIS are the parasitic voltage drops in
the charge and discharge paths, respectively. A rea-
sonable minimum value for h is 1.5, while the absolute
minimum input voltage is calculated with h = 1.
Maximum Input Voltage
The MAX17083 controller includes a minimum on-time
specification, which determines the maximum input
operating voltage that maintains the selected switching
frequency (see the Electrical Characteristics table).
?
?
When trade-offs in trace lengths must be made, it is
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
it is better to allow some extra distance between the
input capacitors and the high-side MOSFET than to
allow distance between the inductor and the low-
side MOSFET or between the inductor and the out-
put filter capacitor.
Route high-speed switching nodes (BST and LX)
away from sensitive analog areas (REF and FB).
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX17085BEVKIT+ | 制造商:Maxim Integrated Products 功能描述:STEP-DOWN REGULATOR - Boxed Product (Development Kits) |
| MAX17085GTL+ | 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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