LM2776_15 Datasheet, PDF (1/23 Pages) Texas Instruments – LM2776 Switched Capacitor Inverter

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LM2776 Switched Capacitor Inverter
LM2776
SNVSA56 – MAY 2015
1 Features
•1 Input Voltage: 2.7 V to 5.5 V
• 200-mA Output Current
• Inverts Input Supply Voltage
• Low-Current PFM Mode Operation
• 2-MHz Switching Frequency
• Greater than 90% Efficiency
• Current Limit and Thermal Protection
• No Inductors
2 Applications
• Operational Amplifier Power Supplies
• Interface Power Supplies
• Data Converter Supplies
• Audio Amplifier Power Supplies
• Portable Electronic Devices
2.7 V to 5.5 V
2.2 2F
Typical Application
LM2776
VIN
VOUT
-VIN @ up to 200mA
EN
C1+
2.2 2F
GND
C1-
1 2F
3 Description
The LM2776 CMOS charge-pump voltage converter
inverts a positive voltage in the range of 2.7 V to 5.5
V to the corresponding negative voltage. The LM2776
uses three low-cost capacitors to provide 200 mA of
output current without the cost, size, and
electromagnetic interference (EMI) related to
inductor-based converters.
With an operating current of only 100 μA and
operating efficiency greater than 90% at most loads,
the LM2776 provides ideal performance for battery-
powered systems requiring a high power negative
power supply.
The LM2776 has been placed in TI's 6-pin SOT-23 to
maintain a small form factor.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM2776
SOT (6)
2.90 mm x 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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Output Impedance vs Input Voltage
I_OUT = 100 mA
5.0
4.5
T_A = -40°C
T_A = 25°C
4.0
T_A = 85°C
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
D005
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.