max8893. MAX889, MAX168x and other have a VERY LIMITED CURRENT, because of their limited power dissipation to 471mW at 70C. This allows for around 40mA with MAX1680.Order , ships MAX889TESA+ – Charge Pump Switching Regulator IC Negative Adjustable -2.5V 1 Output 200mA 8-SOIC (0.154, 3.90mm Width) from Analog Devices