Datasheet > NB685A

NB685A

更新时间： 2024-12-01 17:02:15

品牌	Logo	应用领域
芯源 - MPS		/
页数	文件大小	规格书
23页	1544K
描述
4.5-26V宽输入电压、12A、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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数据手册

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NB685A 数据手册

NB685A

28 V, 12 A, Low Iq, High Current

Synchronous Buck Converter

with +/- 1 A LDO and Buffered Reference

DESCRIPTION

FEATURES

The NB685A provides a complete power supply

with the highest power density for DDR3,

DDR3L, LPDDR3, and DDR4 memory. It



Wide 4.5 V to 28 V Operating Input Range

Compatible for IMVP8

135 μA Low Quiescent Current

12 A Continous Output Current

13 A Peak Output Current

Selectable Ultrasonic Mode

Selectable 500 k/700 k Switching

Frequency

integrates

high-frequency, synchronous,

rectified, step-down, switch-mode converter

(VDDQ) with a 1 A sink/source LDO (VTT) and

buffered low noise reference (VTTREF).

The NB685A 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 a 22 μF ceramic

capacitor. The VTTREF tracks VDDQ/2 with

excellent 1% accuracy.

OCL, OVP, UVP, and Thermal Shutdown

Latch-Off Reset via EN or Power Cycle

QFN 3mm x 3mm Package

Full protection features include OC limit, OVP,

UVP, over-temperature warning (OTW), and

thermal shutdown.

APPLICATIONS



Laptop Computers

Networking Systems

Servers

The converter requires a minimum number of

external components and 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

VDDQ

V_IN

0.68 μH

1.35 V/10 A

4.5 V-24 V

OTW

VIN

BST

22 μF x 1

28 kΩ

DDR_VTT_CONTROL

EN2

22 μF x 3

22.1 kΩ

EN 2

NB685A

VDDQ

100 kΩ

VTT

0.675 V/1 A

3V3

3.3 V

VTT

(Needs external 3.3 V

power supply)

22 μF

VTTS

1 μF

AGND

PGND

VTTREF

MODE

220 nF

0 Ω

NB685A Rev. 1.02

7/6/2018

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NB685A相关器件

型号	品牌	获取价格	描述	数据表
NB686	MPS	获取价格	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
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
NB6FAH0-0-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
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

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