LM2798MM-2.0 ,120mA High Efficiency Step-Down Switched Capacitor Voltage Converter with Voltage MonitoringFeaturesn Output voltage options:The LM2797/98 switched capacitor step-down DC/DC con-2.0V ± 5%, 1. ..
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LM2798MM-1.5-LM2798MM-1.8-LM2798MM-2.0
120mA High Efficiency Step-Down Switched Capacitor Voltage Converter with Voltage Monitoring
LM2797/LM2798
120mA High Efficiency Step-Down Switched Capacitor
Voltage Converter with Voltage Monitoring
General DescriptionThe LM2797/98 switched capacitor step-down DC/DC con-
verters efficiently producea 120mA regulated low-voltage
rail froma 2.6Vto 5.5V input. Fixed output voltage optionsof
1.5V, 1.8V, and 2.0V are available. The LM2797/98 uses
multiple fractional gain configurationsto maximize conver-
sion efficiency over the entire input voltage and output cur-
rent ranges. Also contributingto high overall efficiencyisthe
extremely low supply currentof the LM2797/98: 35µA oper-
ating unloaded and 0.1µAin shutdown.
Featuresof the LM2797/98 include input voltage and output
voltage monitoring. Pin BATOK provides battery monitoring indicating when the input voltageis above 2.85V (typ.).
Pin POK verifies thatthe output voltageisnot more than 5%
(typ.) belowthe nominal output voltageofthe part.
The optimal external component requirementsof the
LM2797/98 solution minimize size and cost, makingthe part
idealfor Li-Ion and other battery powered designs. Two 1µF
flying capacitors and two 10µF bypass capacitorsareall that required, andno inductors are needed.
The LM2797/98 also features short-circuit protection over-
temperature protection, and soft-start circuitryto prevent
excessive inrush currents. The LM2798 hasa 400µs turn-on
time. The turn-on timeofthe LM2797is 100µs.
Features Output voltage options:
2.0V± 5%, 1.8V± 5%, and 1.5V± 6% 120mA output current capability Multi-Gain and Gain Hoppingfor Highest Possible
Efficiency-upto 90% Efficient 2.6Vto 5.5V input range Input and Output Voltage Monitoring (BATOK and POK) Low operating supply current: 35µA Shutdown supply current: 0.1µA Thermal and short circuit protection LM2798 turn-on time: 400µs
LM2797 turn-on time: 100µs Availableinan 10-Pin MSOP Package
Applications Cellular Phones Pagers H/PC and P/PC Devices Portable Electronic Equipment Handheld Instrumentation
Typical Application CircuitApril 2003
LM2797/LM2798
120mA
High
Efficiency
Step-Down
Switched
Capacitor
oltage
Converter
oltage
Monitoring
