I do not know about 1.8V but I've seen some output ICs
with 5V/3.3V and dual push-pull. In fact we are using one
(4mmx4mm QFN) but it is not yet released yet to the public 
and it not meant to drive high current from the 5V and
3.3V (less than 50mA). The output is dual 100mA. It is
quite hot though.

There are quite some power ICs from company like Intersil
which provide high current drives to CPU core (ARM, MIPS
and similar) and have one or two LDOs integrated as well.
They can be quite small (<=6mmx6mm QFN with integrated 
MOSFET and SMPS control circuit). However I do not think 
they offer dual push-pull yet.

Regards,
Xiaofan

-----Original Message-----
From: William "Chops" Westfield 
Sent: Monday, October 03, 2005 12:05 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Low end LPC210x from US$1.47?!

>> Philips Offers fastest ARM7-based microcontrollers to date with
>> aggressive power management and Fast I/O capability Options

What you save in chip cost you spend on (dual) voltage regulators
and IO drivers (4mA IO ports, oh joy...)

So does anyone offer the "obvious" companion analog chip that has
3.3V and 1.8V regulators and a couple medium-current push-pull drivers?
(seems like the big packages designers put Vregs in to get sufficient
power dissipation ought to have plenty of pins left over for a couple
of drivers...)  Some of the circuits designed for cell phones look
pretty close, but not quite right...

BillW
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