MAXREFDES1019
Reference Guide
描述
This document describes a circuit that uses three MAX17541G buck converters and one MAX17504 step-down DC-DC converter. The circuit is arranged so that each buck converter uses the same input with four separate outputs. Each output has a different power specification. The MAX17541G regulator and features are given first, followed by the MAX17504 features.
MAX17541G
The MAX17541G high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input. The converter can deliver up to 500mA and generates output voltages from 0.9V up to 0.92 x VIN. The feedback (FB) voltage is accurate to within ±1.7% over the -40°C to +125°C operating temperature range. The MAX17541G uses peak-current-mode control with pulse-width modulation (PWM) and operates with fixed 600kHz switching frequency at any load.
MAX17504
The MAX17504 is also a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs and operates over a 4.5V to 60V input. The converter can deliver up to 3.5A current. Output voltage is programmable from 0.9V to 0.9 x VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.1.%. The MAX17504 also features a peak-currentmode control architecture. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) control schemes. A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.
特征
MAX17541G
- Reduced Power Dissipation
- Peak Efficiency > 90%
- Shutdown Current = 0.9μA (typ)
- Operates Reliably in Adverse Industrial Environments
- Hiccup-Mode Current Limit, Sink Current Limit, and Autoretry Startup
- Built-In Output-Voltage Monitoring (Active-Low RESET Pin)
- Programmable EN/UVLO Threshold
- Adjustable Soft-Start and Prebiased Power-Up
- -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
MAX17504
- 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
- Peak Efficiency > 90%
- PFM and DCM Modes Enable Enhanced Light-Load Efficiency
- 2.8μA Shutdown Current
- Operates Reliably in Adverse Industrial Environments
- Hiccup Mode Overload Protection
- Adjustable Soft-Start and Prebiased Power-Up
- Built-In Output-Voltage Monitoring with RESET
- Programmable EN/UVLO Threshold
- -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
Enlarge
示意图
PCB布局
物料清单(BOM)
参数化
| 输入类型 | Vin(Min) | Vin(Max) | Iout(Max) | 单路/多路输出 | Vout(V) | Pout(W) | 隔离/非隔离 | 拓扑 |
|---|---|---|---|---|---|---|---|---|
| DC | 24 | 24 | 2 | - | -20.0 | 40 | Non-Isolated | Synchronous Buck |
参数化
| 输入类型 | DC |
| Vin(Min) | 24 |
| Vin(Max) | 24 |
| Iout(Max) | 2 |
| 单路/多路输出 | - |
| Vout(V) | -20.0 |
| Pout(W) | 40 |
| 隔离/非隔离 | Non-Isolated |
| 拓扑 | Synchronous Buck |
Maxim设备 (2)
器件号
|
名称
|
产品线
|
购买
|
设计套件和评估模块 |
|---|---|---|---|---|
| MAX17504 | 4.5V–60V、3.5A、高效率、同步降压DC-DC转换器，带内部补偿 | 开关稳压器 | 立即购买 | Design Kits |
| MAX17541G | 42V、500mA、超小尺寸、高效率、同步、降压型DC-DC转换器 | 开关稳压器 | 立即购买 | Design Kits |
Maxim设备 (2)
| 器件号
|
产品线
|
|---|---|
|
开关稳压器
4.5V–60V、3.5A、高效率、同步降压DC-DC转换器，带内部补偿
|
|
|
开关稳压器
42V、500mA、超小尺寸、高效率、同步、降压型DC-DC转换器
|
设计资料 (3)
| 标题
|
类型
|
尺寸
|
日期
|
|---|---|---|---|
 maxrefdes1019-pcb |
2MB | 2019-07-09 | |
| 6481_MAXREFDES1019_BOM |
356KB | 2019-07-09 | |
| MAXREFDES1019-schematic |
34KB | 2019-07-09 |
| 日期
|
类型
|
|---|---|
| 2019-07-09 |
(PDF, 2MB) |
| 2019-07-09 |
(PDF, 356KB) |
| 2019-07-09 |
(PDF, 34KB) |
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