Compact buck converter design from ONSEMI an alternate solution for LDOs producing larger current. Link here (PDF)
Low dropout, linear regulators, or LDOs, are typically used for post−regulation because they are easily implemented and provide a relatively noise−free power source. However, for higher currents, such as 1.0 A and above, LDOs take up a great deal of space and can dissipate too much power and thus heat. For low dropout applications where you need another voltage rail, and you already have a 5.0 V or 3.3 V rail, a simple PWM buck converter provides a more efficient choice than a linear regulator.