Datasheet > 电源电路 > 开关式稳压器或控制器> SP7651ER-L

SP7651ER-L

更新时间： 2024-01-28 05:08:27

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器
页数	文件大小	规格书
15页	1035K
描述
Wide Input Voltage Range 3Amp 900kHz Buck Regulator

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技术参数
数据手册

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SP7651ER-L 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	HVSON,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.66	其他特性：	ALSO OPERATES WITH 3V TO 20V SUPPLY
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	5.5 V
最小输入电压：	4.5 V	标称输入电压：	5 V
JESD-30 代码：	R-PDSO-N26	JESD-609代码：	e3
长度：	7 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	26
最高工作温度：	85 °C	最低工作温度：	-40 °C
最大输出电流：	5 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	HVSON	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1 mm
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	990 kHz	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	4 mm
Base Number Matches：	1

SP7651ER-L 数据手册

PIN DESCRIPTION

Pin #

ꢀ-3

Pin Name Description

Pgnd

Ground connection for the synchronous rectiﬁer

4,8,ꢀ9-2ꢀ

GND

Ground Pin. The control circuitry of the IC and lower power driver are refer-

enced to this pin. Return separately from other ground traces to the (-) terminal

of Cout.

Vfb

Feedback Voltage and Short Circuit Detection pin. It is the inverting input of the

Error Ampliﬁer and serves as the output voltage feedback point for the Buck

Converter. The output voltage is sensed and can be adjusted through an exter-

nal resistor divider. Whenever Vfb drops 0.25V below the positive reference, a

short circuit fault is detected and the IC enters hiccup mode.

COMP

Output of the Error Ampliﬁer. It is internally connected to the inverting input of

the PWM comparator. An optimal ﬁlter combination is chosen and connected

to this pin and either ground or Vfb to stabilize the voltage mode loop.

UVIN

UVLO input for Vin voltage. Connect a resistor divider between Vin and UVin to

set minimum operating voltage.

Soft Start. Connect an external capacitor between SS and GND to set the soft

start rate based on the ꢀ0µA source current. The SS pin is held low via a ꢀmA

(min) current during all fault conditions.

ꢀ0-ꢀ3

Vin

Input connection to the high side N-channel MOSFET. Place a decoupling

capacitor between this pin and Pgnd.

ꢀ4-ꢀ6,23-26

Connect an inductor between this pinand Vout

ꢀ7

ꢀ8

No Connect

BST

High side driver supply pin. Connect BST to the external boost diode and ca-

pacitor as shown in the Typical Application Circuit on page ꢀ. High side driver

is connected between BST pin and SWN pin.

Vcc

Input for external 5V bias supply

THEORY OF OPERATION

General Overview

that accurately sets the PWM frequency to

900kHz.

The SP7651 is a ﬁxed frequency, voltage

mode, synchronous PWM regulator opti-

mized for high efﬁciency. The part has been

designed to be especially attractive for split

plane applications utilizing 5V to power the

controller and 2.5V to 20V for step down

conversion.

The SP765ꢀ contains two unique control

features that are very powerful in distributed

applications.First,asynchronousdrivercon-

trol is enabled during startup, to prohibit the

low side NFET from pulling down the output

until the high side NFET has attempted to

turn on. Second, a 100% duty cycle timeout

ensuresthatthelowsideNFETisperiodically

enhanced during extended periods at 100%

dutycycle.Thisguaranteesthesynchronized

refreshing of the BST capacitor during very

large duty ratios.

TheheartoftheSP765ꢀisawidebandwidth

transconductance ampliﬁer designed to ac-

commodate Type II and Type III compensa-

tion schemes. A precision 0.8V reference,

present on the positive terminal of the error

ampliﬁer, permits the programming of the

output voltage down to 0.8V via the V_FBpin.

The output of the error ampliﬁer, COMP,

which is compared to a ꢀ.ꢀV peak-to-peak

ramp, is responsible for trailing edge PWM

control.Thisvoltageramp,andPWMcontrol

logic are governed by the internal oscillator

The SP765ꢀ also contains a number of

valuableprotectionfeatures.Programmable

UVLO allows the user to set the exact V_IN

value at which the conversion voltage can

Rev J: 3/ꢀ4/07

SP765ꢀ Wide Input Voltage Range 3A, 900kHz, Buck Regulator

1 2 345 6 7...15

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