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參數(shù)資料
| 型號(hào)： | LM2787TPX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.01 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PBGA8 |
| 封裝： | SMD-8 |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大小： | 233K |
| 代理商： | LM2787TPX/NOPB |
LM2787
Low Noise Regulated Switched Capacitor Voltage
Inverter in micro SMD
General Description
The LM2787 CMOS Negative Regulated Switched Capacitor
Voltage Inverter delivers a very low noise adjustable output
for an input voltage in the range of +2.7V to +5.5V. Four low
cost capacitors are used in this circuit to provide up to 10mA
of output current. The regulated output for the LM2787 is
adjustable between 1.5V and 5.2V. The LM2787 operates
at 260 kHz (typical) switching frequency to reduce output
resistance and voltage ripple. With an operating current of
only 400 A (charge pump power efficiency greater than
90% with most loads) and 0.05 A typical shutdown current,
the LM2787 provides ideal performance for cellular phone
power amplifier bias and other low current, low noise nega-
tive voltage needs. The device comes in small 8-Bump micro
SMD and thin micro SMD packages.
Features
n
Inverts and regulates the input supply voltage
n
Small 8-Bump micro SMD and thin micro SMD
packages
n
91% typical charge pump power efficiency at 10mA
n
Low output ripple
n
Shutdown lowers Quiescent current to 0.05 A (typical)
Applications
n
Wireless Communication Systems
n
Cellular Phone Power Amplifier Biasing
n
Interface Power Supplies
n
Handheld Instrumentation
n
Laptop Computers and PDA’s
Typical Application Circuit and Connection Diagram
10131325
8-Bump micro SMD (Top View)
10131302
April 2003
LM2787
Low
Noise
Regulated
Switched
Capacitor
V
oltage
Inverter
in
micro
SMD
2003 National Semiconductor Corporation
DS101313
www.national.com
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