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LM2687

Features: `Inverts and regulates the input supply voltage`Small MSOP-8 package`91% typical charge pump power efficiency at 10mA`Low output ripple (1mV typical)`Shutdown lowers Quiescent current to 0.05 A (typical)Application`Wireless Communication Systems`Cellular Phone Power Amplifier Biasing`Int...

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SeekIC No. : 004395000 Detail

LM2687: Features: `Inverts and regulates the input supply voltage`Small MSOP-8 package`91% typical charge pump power efficiency at 10mA`Low output ripple (1mV typical)`Shutdown lowers Quiescent current to 0...

LM2687 Data Sheet

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Part Number:
LM2687
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

`Inverts and regulates the input supply voltage
`Small MSOP-8 package
`91% typical charge pump power efficiency at 10mA
`Low output ripple (1mV typical)
`Shutdown lowers Quiescent current to 0.05 A (typical)




Application

`Wireless Communication Systems
`Cellular Phone Power Amplifier Biasing
`Interface Power Supplies
`Handheld Instrumentation
`Laptop Computers and PDA's




Pinout

Connection Diagram




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VIN to GND or
GND to OUT)..................................................... + 5.8V
SD ..................................(GND − 0.3V) to (VIN + 0.3V)
VNEG and VOUT Continuous Output
Current ..............................................................10mA
VOUT Short-Circuit Duration to GND
(Note 2) .............................................................1 sec.
Continuous Power Dissipation (TA
= 25 ) (Note 3) .............................................600mW
TJMAX (Note 3) ...................................................150
qJA (Note 3) ..................................................250 /W
Operating Input Voltage Range ...............2.7V to 5.5V
Operating Output Current Range ...........0mA to 10mA
Operating Ambient ................................−40 to 85
Temp. Range
Operating Junction Temp. Range ..........−40 to 110
Storage Temperature.......................... −65 to 150
Lead Temp. (Soldering, 10 sec.) ..........................300
ESD Rating (Note 4)............................................... 2kV

Output Current 10 mA
Output Min -5.2 Volt
Output Max -1.5 Volt
Adjustable Output Yes
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Frequency Min 100 kHz
Frequency Max 100 kHz
Efficiency (peak) 91 %
Adj Switch Frequency No
On/Off Pin Yes
Quiescent Current 0.5 mA
Special Features Low noise
PWM Mode Inverter with LDO
Topology Switched capacitor inverter with LDO
Step-Down No
Step-Up No
Inverting Yes
RegType Switched Cap Regulator
Temperature Min -40 deg C
Temperature Max 105 deg C
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Description

The LM2687 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 LM2687 is adjustable between −1.5V and −5.2V. The LM2687 operates at 100 kHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 500 A (charge pump power efficiency greater than 90% with most loads) and 0.05 A typical shutdown current, the LM2687 provides ideal performance for cellular phone power amplifier bias and other low current, low noise negative voltage needs. The device comes in a small 8-pin MSOP package.






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