| Topology | CuK, Inverting |
| Vin (Min) (V) | 2.7 |
| Vin (Max) (V) | 14 |
| Vout (Max) (V) | -1.23 |
| Vout (Min) (V) | -32 |
| Features | Light Load Efficiency |
| Switch current limit (Typ) (A) | 1.2 |
| Switching frequency (Min) (kHz) | 1400 |
| Switching frequency (Max) (kHz) | 1400 |
| Iq (Typ) (mA) | 1.8 |
| Iout (Max) (A) | 0.4 |
| Rating | Catalog |
- 1.4-MHz Switching Frequency
- Low RDS(ON) DMOS FET
- 1-mVp-p Output Ripple
- –5 V at 300 mA From 5-V Input
- Better Regulation Than a Charge Pump
- Uses Tiny Capacitors and Inductors
- Wide Input Range: 2.7 V to 14 V
- Low Shutdown Current: <1 μA
- 5-Pin SOT-23 Package
The LM2611 is a current mode, PWM inverting switching regulator. Operating from a 2.7-V to 4-V supply, it is capable of producing a regulated negative output voltage of up to &ndash(36 VIN(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 1.4 MHz, the inductors and output capacitor can be physically small and low cost. High efficiency is achieved through the use of a low RDS(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 as a small 5-pin, SOT-23 package and comes in two grades. Grade A has a 1.2-A current limit and 0.5-Ω RDS(ON), and Grade B has a 0.9-A current limit and 0.7-Ω RDS(ON).
