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參數資料
| 型號： | LM2621 |
| 文件頁數： | 5/10頁 |
| 文件大小： | 254K |
| 代理商： | LM2621 |
Typical Performance Characteristics
(Continued)
Detailed Description
OPERATING PRINCIPLE
The LM2621 is designed to provide step-up DC-DC voltage
regulation in battery-powered and low-input voltage sys-
tems. It combines a step-up switching regulator, N-channel
power MOSFET, built-in current limit, thermal limit, and volt-
age reference in a single 8-pin MSOP package . The switch-
ing DC-DC regulator boosts an input voltage between 1.2V
and 14V to a regulated output voltage between 1.24V and
14V. The LM2621 starts from a low 1.1V input and remains
operational down to 0.65V.
This device is optimized for use in cellular phones and other
applications requiring a small size, low profile, as well as low
quiescent current for maximum battery life during stand-by
and shutdown. A high-efficiency gated-oscillator topology of-
fers an output of up to 1A.
Additional features include a built-in peak switch current
limit, and thermal protection circuitry.
GATED OSCILLATOR CONTROL SCHEME
A unique gated oscillator control scheme enables the
LM2621 to have an ultra-low quiescent current and provides
a high efficiency over a wide load range. The switching fre-
quency of the internal oscillator is programmable using an
external resistor and can be set between 300 kHz and 2
MHz.
Peak Inductor Current vs
Load Current
DS100934-10
Maximum Load Current vs
Input Voltage
DS100934-11
DS100934-14
FIGURE 1. Functional Diagram
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2621_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Input Voltage, Step-Up DC-DC Converter |
| LM2621EVAL | 功能描述:EVALUATION BOARD FOR LM2621 RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2621EVAL/NOPB | 功能描述:電源管理IC開發工具 EVAL BOARDFOR LM2621 RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2621MM | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM2621MM | 制造商:Texas Instruments 功能描述:DC/DC UP CONVERTER ADJ SMD 2621 |
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