Datasheet > NB686

NB686

更新时间： 2024-12-01 17:01:55

品牌	Logo	应用领域
芯源 - MPS		/
页数	文件大小	规格书
23页	1558K
描述
4.5-26V宽输入电压、8A、低静态电流、大电流同步降压变换器，搭载 +/-1A LDO 和缓冲基准电压源

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中文翻译

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NB686 数据手册

NB686

28 V, 8 A, Low Iq, High Current

Synchronous Buck Converter

with +/- 1 A LDO and Bufferd Refference

DESCRIPTION

FEATURES

The NB686 provides a complete power supply

with the highest density for DDR3, DDR3L,

LPDDR3, and DDR4 memory. It integrates a

high-frequency, synchronous, rectified, step-

down, switch-mode converter (VDDQ) with a

1 A sink/source LDO (VTT) and buffered low

noise reference (VTTREF).



Wide 4.5 V to 28 V Operating Input Range

Compatible for IMVP8

135 μA Low Quiescent Current

8 A Continous Output Current

9A Peak Output Current

Selectable Ultrasonic Mode

Selectable 500 kHz/700 kHz Switching

Frequency

The NB686 operates at high efficiency over a

wide output current load range based on MPS

proprietary switching loss reduction technology

and internal low Ron power MOSFETs.



Built-In +/- 1 A VTTLDO

1% Buffered VTTREF Output

Adaptive COT for Fast Transient

DC Auto-Tune Loop

Stable with POSCAP and Ceramic Output

Capacitors

Over-Temperature Warning

Internal Soft Start

Output Discharge

Adaptive constant-on-time (COT) control mode

provides fast transient response and eases loop

stabilization. The DC auto-tune loop provides

good load and line regulation.



The VTT LDO provides 1 A sink/source current

capability and requires only 22 μF ceramic

capacitors. The VTTREF tracks VDDQ/2 with

excellent 1% accuracy.

OCL, OVP, UVP, and Thermal Shutdown

Latch-Off Re-set via EN or Power Cycle

QFN 3mm x 3mm Package

Full protection features include OC limit, OVP,

UVP, thermal shutdown, and over-temperature

warning (OTW).

APPLICATIONS



Laptop Computer

Networking Systems

Server

The converter requires a minimum number of

external components, and it is available in a QFN

3mm x 3mm package.

Distributed Power Systems

All MPS parts are lead-free, halogen-free, and adhere to the RoHS

directive. For MPS green status, please visit the MPS website under

Quality Assurance.

“MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

220 nF

V_IN

4.5 V-24 V

VDDQ

1.35 V/8 A

0.68 μH

VIN

OTW

BST

22 μF x 1

28 kΩ

DDR_VTT_CONTROL

EN2

22 μF x 3

22.1 kΩ

EN 2

NB686

VDDQ

100 kΩ

VTT

0.675 V/1 A

3V3

3.3 V

(Need external 3.3 V

power supply)

VTT

VTTS

22 μF

AGND

PGND

1 μF

VTTREF

MODE

220 nF

0 Ω

NB686 Rev. 1.02

7/26/2017

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

12 3 4 5 6 7...23

中文翻译

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与NB686相关器件

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NB6FAAH0-0-B	ETC	获取价格	N e u t r i k Â® P a r t N u m b e r G u i d
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NB6FBH0-0-B	ETC	获取价格	N e u t r i k Â® P a r t N u m b e r G u i d
NB6G	GLENAIR	获取价格	Military Standard Connector Index
NB6HQ14M	ONSEMI	获取价格	2.5V 5GHz / 6.5Gbps Differential Input to 1.8V / 2.5V 1:4 CML Clock / Data Fanout Buffer
NB6HQ14MMNG	ONSEMI	获取价格	2.5V 5GHz / 6.5Gbps Differential Input to 1.8V / 2.5V 1:4 CML Clock / Data Fanout Buffer
NB6HQ14MMNHTBG	ONSEMI	获取价格	2.5V 5GHz / 6.5Gbps Differential Input to 1.8V / 2.5V 1:4 CML Clock / Data Fanout Buffer
NB6HQ14MMNTXG	ONSEMI	获取价格	2.5V 5GHz / 6.5Gbps Differential Input to 1.8V / 2.5V 1:4 CML Clock / Data Fanout Buffer
NB6L11	ONSEMI	获取价格	2.5V / 3.3V MULTILEVEL INPUT TO DIFFERENTIAL LVPECL/LVNECL 1:2 CLOCK OR DATA FANOUT BUFFER
NB6L11_06	ONSEMI	获取价格	2.5 V/3.3 V Multilevel Input to Differential LVPECL/LVNECL 1:2 Clock or Data Fanout Buffer

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