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LM2797MM-1.8 Datasheet

  • LM2797MM-1.8

  • 120mA High Efficiency Step-Down Switched Capacitor Voltage C...

  • 14頁

  • NSC

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LM2797/LM2798 120mA High Efficiency Step-Down Switched Capacitor Voltage Converter with
Voltage Monitoring
April 2003
LM2797/LM2798
120mA High Efficiency Step-Down Switched Capacitor
Voltage Converter with Voltage Monitoring
General Description
The LM2797/98 switched capacitor step-down DC/DC con-
verters efficiently produce a 120mA regulated low-voltage
rail from a 2.6V to 5.5V input. Fixed output voltage options of
1.5V, 1.8V, and 2.0V are available. The LM2797/98 uses
multiple fractional gain configurations to maximize conver-
sion efficiency over the entire input voltage and output cur-
rent ranges. Also contributing to high overall efficiency is the
extremely low supply current of the LM2797/98: 35碌A(chǔ) oper-
ating unloaded and 0.1碌A(chǔ) in shutdown.
Features of the LM2797/98 include input voltage and output
voltage monitoring. Pin BATOK provides battery monitoring
by indicating when the input voltage is above 2.85V (typ.).
Pin POK verifies that the output voltage is not more than 5%
(typ.) below the nominal output voltage of the part.
The optimal external component requirements of the
LM2797/98 solution minimize size and cost, making the part
ideal for Li-Ion and other battery powered designs. Two 1碌F
flying capacitors and two 10碌F bypass capacitors are all that
is required, and no inductors are needed.
The LM2797/98 also features short-circuit protection over-
temperature protection, and soft-start circuitry to prevent
excessive inrush currents. The LM2798 has a 400碌s turn-on
time. The turn-on time of the LM2797 is 100碌s.
Features
n
Output voltage options:
2.0V
鹵
5%, 1.8V
鹵
5%, and 1.5V
鹵
6%
n
120mA output current capability
n
Multi-Gain and Gain Hopping for Highest Possible
Efficiency - up to 90% Efficient
n
2.6V to 5.5V input range
n
Input and Output Voltage Monitoring (BATOK and POK)
n
Low operating supply current: 35碌A(chǔ)
n
Shutdown supply current: 0.1碌A(chǔ)
n
Thermal and short circuit protection
n
LM2798 turn-on time: 400碌s
LM2797 turn-on time: 100碌s
n
Available in an 10-Pin MSOP Package
Applications
n
n
n
n
n
Cellular Phones
Pagers
H/PC and P/PC Devices
Portable Electronic Equipment
Handheld Instrumentation
Typical Application Circuit
20044501
漏 2003 National Semiconductor Corporation
DS200445
www.national.com

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