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參數(shù)資料
| 型號： | LM3218SE |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, DSO8 |
| 封裝： | LTCC-8 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 4709K |
| 代理商： | LM3218SE |
March 18, 2008
LM3218
650 mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
General Description
The LM3218 is a DC-DC converter with inductor which is op-
timized for powering RF power amplifiers (PAs) from a single
Lithium-Ion cell. It steps down an input voltage in the range
from 2.7V to 5.5V to an adjustable output voltage of 0.8V to
3.6V. Output voltage is set by using a V
CON analog input to
control power levels and efficiency of the RF PA.
The LM3218 offers superior electrical performance for mobile
phones and similar RF PA applications with a reduced foot-
print (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM oper-
ation minimizes RF interference. A shutdown function turns
the device off and reduces battery consumption to 0.01 A
(typ.).
The LM3218 is available in an integrated inductor 8–pin LTCC
package. A high switching frequency (2 MHz typ.) allows use
of tiny surface-mount components. Only two small external
surface-mount components, two ceramic capacitors, are re-
quired. The overall board space is reduced up to 25% from
the typical discrete inductor solution.
Features
■ Includes 2.6 H Inductor in very small form factor (3mm x
2.5mm x 1.2mm)
■ 2 MHz (typ.) PWM Switching Frequency
■ Operates from a single Li-Ion cell (2.7V to 5.5V)
■ Adjustable Output Voltage (0.8V to 3.6V)
■ Fast Output Voltage Transient (0.8V to 3.4V in 25 s typ.)
■ 650 mA Maximum load capability
■ High Efficiency (95% typ. at 3.9 V
IN, 3.4 VOUT at 400 mA)
■ 8-pin LTCC Package
■ Current Overload Protection
■ Thermal Overload Protection
Applications
■ Cellular Phones
■ Hand-Held Radios
■ RF PC Cards
■ Battery-Powered RF Devices
Typical Application
30050401
FIGURE 1. LM3218 Typical Application
2008 National Semiconductor Corporation
300504
www.national.com
LM3218
650
mA
Miniature,
Adjustable,
Step-Down
DC-DC
Converter
with
Integrated
Inductor
for
RF
Power
Amplifiers
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PDF描述 |
|---|---|
| LM3350MWC | SWITCHED CAPACITOR CONVERTER, 1100 kHz SWITCHING FREQ-MAX, UUC |
| LM336BZ-5.0/NOPB | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
| LM336Z-2.5/T7 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.49 V, PBCY3 |
| LM336Z-5.0/T7 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
| LM336BZ-5.0/T7 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3218SEE/NOPB | 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(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3218SEX | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.7V to 5.5V 8-Pin LTCC T/R |
| LM3218SEX/NOPB | 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(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM321AH | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM221/LM321 Precision Preamplifiers |
| LM321H | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM221/LM321 Precision Preamplifiers |
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