MaxLinear-XRP6657.pdf资源-CSDN文库

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MaxLinear的XRP6657是一款高效同步降压直流到直流转换器，专为便携式电池供电的应用设计，能够提供高达1.5安培的电流。该器件在2.5伏至5.5伏的输入电压范围内工作，可调节输出电压低至0.6伏。XRP6657采用恒定的1.3兆赫脉宽调制（PWM）方案，确保了外部组件的小型化、低输出电压纹波以及固定频率噪声。在轻负载条件下，通过脉冲跳过模式（PSM）提升效率。 XRP6657具有低 dropout 模式，支持100%占空比操作，进一步减小了解决方案的体积。内置的电流模式内部补偿网络和同步开关消除了对外部肖特基二极管的需求。过流和过温保护功能确保在异常工作条件下的安全运行。该芯片封装在符合RoHS标准的环保无卤素6引脚超薄DFN封装中。 XRP6657适用于多种应用，包括： 1. 点负载电源 2. 机顶盒 3. 便携式媒体播放器 4. 硬盘驱动器其主要特性包括： 1. 保证1.5A输出电流 2. 固定1.3MHz频率的PWM操作，最高效率可达95% 3. 输入电压范围：2.5V至5.5V 4. 可调输出电压 5. 内部补偿网络 6. 不需要外部肖特基二极管 7. LDO操作：100%占空比 8. 空载时的静态电流仅为240μA 9. 关断电流仅为1μA 10. 软启动功能 11. 过流/过温保护 12. 环保无卤素的DFN-6封装典型的应用电路图展示了XRP6657如何在实际电路中部署。在设计使用XRP6657的电源转换系统时，需要考虑电感、输入和输出电容等关键组件的选择，以确保高效稳定的电源转换。绝对最大额定值是设备承受的压力等级，而非正常工作条件。在超过这些额定值的情况下使用器件可能会导致永久性损坏。因此，在实际应用中，必须确保工作条件始终在制造商指定的安全范围内。 MaxLinear的XRP6657是一款高效、紧凑且具有多重保护功能的同步降压转换器，适合对电源效率和尺寸有严格要求的便携式电子设备。其独特的特性，如内置补偿网络和无需外部肖特基二极管的设计，使得在减少系统复杂性的同时，提高了整体性能。

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November 2019

Rev. 1.5.1

1/12 Rev. 1.5.1

GENERAL DESCRIPTION

The XRP6657 is a high efficiency synchronous

step down DC to DC converter capable of

delivering up to 1.5 Amp of current and

optimized for portable battery-operated

applications.

Operating over an input voltage range of 2.5V

to 5.5V, it provides an adjustable regulated

output voltage down to 0.6V. The XRP6657

uses a constant 1.3 MHz frequency pulse width

modulation (PWM) scheme allowing for

compact external components, low output

voltage ripple and fixed frequency noise, while

Pulse Skip Mode (PSM) is used to improve

light load efficiency. A low dropout mode

provides 100% duty cycle operation.

The solution footprint is further reduced by a

current mode internal compensation network

and built-in synchronous switch removing the

need for an external Schottky. Over-current

and over-temperature protection insures safe

operations under abnormal operating

conditions.

The XRP6657 is available in a compact RoHS

compliant “green”/halogen free thin 6-pin DFN

package.

APPLICATIONS

• Point of Loads

• Set-Top Boxes

• Portable Media Players

• Hard Disk Drives

FEATURES

• Guaranteed 1.5A Output Current

− Fixed 1.3MHz Frequency PWM Operations

− Up to 95% efficiency

− Input Voltage: 2.5V to 5.5V

• Adjustable Output Voltage

• Internal Compensation Network

• No Schottky Diode Required

• LDO Operation: 100% Duty Cycle

• 240μA Quiescent Current (no load)

• 1μA Shutdown Current

• Soft Start Function

• Over-current/Over-temperature

Protection

• “Green”/Halogen Free DFN-6 Package

TYPICAL APPLICATION DIAGRAM

Fig. 1: XRP6657 Application Diagram

2/12 Rev. 1.5.1

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of

the device at these ratings or any other above those

indicated in the operation sections of the specifications

below is not implied. Exposure to absolute maximum

rating conditions for extended periods of time may affect

reliability.

Input Voltage V

....................................... -0.3V to 6.0V

EN, V

Voltage ........................................... -0.3V to V

SW Voltage ...................................... -0.3V to (V

+0.3V)

PMOS Switch Source Current (DC) .............................. 2A

NMOS Switch Sink Current (DC) ................................. 2A

Peak Switch Sink and Source Current ....................... 3.5A

Lead Temperature (Soldering, 10 sec) ................... 260°C

Storage Temp. Range T

STG

....................... -65ºC to 150°C

ESD Rating (HBM - Human Body Model) .................... 2kV

ESD Rating (MM - Machine Model) ........................... 200V

OPERATING RATINGS

Input Voltage Range V

............................... 2.5V to 5.5V

Ambient Temperature Range T

................. -40°C to 85°C

Junction Temperature Range T

................. -40°C to 125°C

Thermal Resistance θ

...................................... 10°C/W

Thermal Resistance θ

...................................... 55°C/W

Note 1: T

is a function of the ambient temperature T

and

power dissipation P

= T

+ P

x 55°C/W).

Note 2:XRP6657 has a build-in temperature protection

circuitry to avoid damages from overload conditions.

ELECTRICAL SPECIFICATIONS

Specifications are for an Operating Junction Temperature of T

= 25°C only; limits applying over the full Operating Ambient

Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical

correlation. Typical values represent the most likely parametric norm at T

= 25°C, and are provided for reference purposes

only. Unless otherwise indicated, V

= 5.0V, T

= 25°C.

Parameter Min. Typ. Max. Units Conditions

Feedback Current I

VFB

±100

Regulated Feedback Voltage V

0.588

0.600

0.612

= 25°C

0.585

0.600

0.615

•

-40°C ≤ T

≤ 85°C

Reference Voltage Line

Regulation ΔV

0.4 %/V • V

= 2.5V to 5.5V

Output Voltage Accuracy ΔV

OUT

-2.5

2.5

•

Output Over-Voltage Lockout

ΔV

OVL

20 50 80 mV ΔV

OVL

= V

OVL

- V

Output Voltage Line Regulation

ΔV

OUT

0.4 %/V • V

= 2.5V to 5.5V

Peak Inductor Current I

2.4 A

=3V, V

=0.5V or V

OUT

=90%,

duty cycle

<35%

Output Voltage Load Regulation

LOADREG

0.2 %/A I

OUT

=10mA to 1.5A

Quiescent Current I

240

340

µA

=0.5V or V

OUT

=90%

Shutdown Current I

SHTDWN

0.1

µA

=0V, V

=4.2V

Oscillator Frequency f

OSC

1.04

1.3

1.56

MHz

•

=0.6V or V

OUT

=100%

Minimum Duty Cycle D

MIN

20 %

RDS(ON) of PMOS R

PFET

0.18

Ω

=750mA

RDS(ON) of NMOS R

NFET

0.16

Ω

=-750mA

SW Leakage I

LSW

±1

µA

=0V, V

=0V or 5V, V

=5V

Enable Threshold V

1.2 V •

Shutdown Threshold V

0.4

•

EN Leakage Current I

±1

µA

•

Note 1: The Switch Current Limit is related to the Duty Cycle. Please refer to figure 29 for details.

Note 2: Dynamic quiescent current is higher due to the gate charge being delivered at the switching frequency.

Note 3: Reference Voltage Line Regulations is defined as

剩余11页未读，继续阅读

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