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LM2776 Datenblatt(PDF) 9 Page - Texas Instruments

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Teilenummer LM2776
Bauteilbeschribung  Switched Capacitor Inverter
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Hersteller  TI1 [Texas Instruments]
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LM2776 Datenblatt(HTML) 9 Page - Texas Instruments

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LM2776
EN
VIN
C1+
VOUT
GND
2 MHz
Osc.
Switch Array
Switch
Drivers
C1-
Current
Limit
Reference
9
LM2776
www.ti.com
SNVSA56A – MAY 2015 – REVISED FEBRUARY 2016
Product Folder Links: LM2776
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
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 of
−2.7 V to −5.5 V. The LM2776 uses three low-cost capacitors to provide
up to 200 mA of output current.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Input Current Limit
The LM2776 contains current limit circuitry that protects the device in the event of excessive input current and/or
output shorts to ground. The input current is limited to 400 mA (typical at VIN = 5.5 V) when the output is shorted
directly to ground. When the LM2776 is current limiting, power dissipation in the device is likely to be quite high.
In this event, thermal cycling is expected.
7.3.2 PFM Operation
To minimize quiescent current during light load operation, the LM2776 allows PFM or pulse-skipping operation.
By allowing the charge pump to switch less when the output current is less than 40 mA, the quiescent current
drawn from the power source is minimized. The frequency of pulsed operation is not limited and can drop into the
sub-1-kHz range when unloaded. As the load increases, the frequency of pulsing increases until it transitions to
constant frequency. The fundamental switching frequency of the LM2776 is 2 MHz.
7.3.3 Output Discharge
In shutdown, the LM2776 actively pulls down on the output of the device until the output voltage reaches GND. In
this mode, the current drawn from the output is approximately 1.85 mA.
7.3.4 Thermal Shutdown
The LM2776 implements a thermal shutdown mechanism to protect the device from damage due to overheating.
When the junction temperature rises to 150°C (typical), the part switches into shutdown mode. The LM2776
releases thermal shutdown when the junction temperature of the part is reduced to 130°C (typical).


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