LM2611  Product Folder

The LM2611 is a current mode, PWM inverting switching regulator. Operating from a 2.7 - 14V supply, it is capable of producing a regulated negative output voltage of up to -(36-V_IN(MAX)). The LM2611 utilizes an input and output inductor, which enables low voltage ripple and RMS current on both the input and the output. With a switching frequency of 1.4MHz, the inductors and output capacitor can be physically small and low cost. High efficiency is achieved through the use of a low R_DS(ON) FET.

The LM2611 features a shutdown pin, which can be activated when the part is not needed to lower the Iq and save battery life. A negative feedback (NFB) pin provides a simple method of setting the output voltage, using just two resistors. Cycle-by-cycle current limiting and internal compensation further simplify the use of the LM2611.

The LM2611 is available is a small SOT23-5 package. It comes in two grades:

	Grade A	Grade B
Current Limit	1.2A	0.9A
RDS(ON)	0.5	0.7

• 1.4MHz switching frequency
• Low R_DS(ON) DMOS FET
• 1mVp-p output ripple
• -5V at 300mA from 5V input
• Better regulation than a charge pump
• Uses tiny capacitors and inductors
• Wide input range: 2.7V to 14V
• Low shutdown current: <1uA
• 5-lead SOT-23 package

• MR Head Bias
• Digital camera CCD bias
• LCD bias
• GaAs FET bias
• Positive to negative conversion