Datasheet > LM8850

LM8850

更新时间： 2024-01-01 01:09:04

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	1994K
描述
Evaluation Board Application Note working demonstration

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LM8850 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	VFBGA,
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	5.75	其他特性：	ALSO OPERATES IN PFM CONTROL TECHNIQUE, ALSO OPERATES IN ADJUSTABLE MODE FROM 3.6 TO 5.7V
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：	2.3 V	标称输入电压：	3.6 V
JESD-30 代码：	R-PBGA-B9	JESD-609代码：	e1
长度：	1.6045 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	9
最高工作温度：	85 °C	最低工作温度：	-40 °C
最大输出电流：	1.65 A	最大输出电压：	5.7 V
最小输出电压：	3.6 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	VFBGA	封装形状：	RECTANGULAR
封装形式：	GRID ARRAY, VERY THIN PROFILE, FINE PITCH	峰值回流温度（摄氏度）：	260
座面最大高度：	0.395 mm	表面贴装：	YES
切换器配置：	BOOST	最大切换频率：	2750 kHz
温度等级：	INDUSTRIAL	端子面层：	Tin/Silver/Copper (Sn/Ag/Cu)
端子形式：	BALL	端子节距：	0.5 mm
端子位置：	BOTTOM	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	1.564 mm	Base Number Matches：	1

National Semiconductor

Application Note 2119

John Woodward

LM8850 Evaluation Board

Application Note

March 30, 2011

where the converter is in PFM mode at light loads and switch-

es to PWM mode at heavy loads or in forced PWM mode.

Hysteretic PFM extends the battery life by reducing the qui-

escent current to 7µA (typ.) during light load and standby

conditions. Synchronous operation provides true shutdown

isolation and improves the efficiency at medium to full load

conditions.

General Description

The LM8850 evaluation board is a working demonstration of

a step-up DC-DC converter that has been optimized for use

with a super-capacitor. The super-capacitor protects a battery

from power surges and enables new high-power applications

in mobile device architectures. The LM8850 creates an ideal

rail from 3.6V to 5.7V from an input voltage range of 2.3V to

High switching frequency enables smaller passive compo-

nents. Internal compensation is used for a broader range of

inductor and output capacitor values to meet system demand

and achieve small system solution size.

5.5V, V_INmust be 10% lower than expected V_OUT

An I²C interface controlling multiple output voltage settings,

input current limits, and load currents up to 1A provides su-

perior user flexibility. The LM8850 operates in Auto mode,

Typical Application Circuit with Super-Capacitor

30150501

301505

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