Looks like the upcoming Intersil ISL6455 is an interesting
IC for handheld device powered by power-hungry MCUs like
ARM/MIPS/...

Not so sure if this IC is designed in Irvine CA or the=20
Research Triangle NC. Intersil is very strong in Desktop
VRM field but not so strong in the low power field.
AD, MAXIM, Linear Tech and TI seem to be stronger.

Regards,
Xiaofan


--------From Intersil Website----------------------
The ISL6455 is a highly integrated triple output regulator=20
which provides a single chip solution for FPGA's and wireless=20
chipset power management. The device integrates a high efficiency
 synchronous buck regulator (adjustable) with two ultra low noise=20
LDO regulators (adjustable). Either the ISL6455 or ISL6455A can=20
be selected based on whether 3.3V =B110% or 5V =B110% is required=20
as an input voltage.

...

Key Features=20
 =20
Fully Integrated Synchronous Buck Regulator + Dual LDO=20
PWM Output Voltage adjustable.=20
0.8V to 2.5V with ISL6455 (VIN =3D 3.3V)=20
0.8V to 3.3V with ISL6455A (VIN =3D 5.0V)=20
High Output Current 600mA=20
Dual LDO Adjustable Options=20
LDO1, 1.2V to VIN-0.3V (3.3Vmax) 300mA=20
LDO2, 1.2V to VIN-0.3V (3.3Vmax) 300mA=20
Ultra-Compact DC-DC converter design=20
Stable with small ceramic output capacitors & no load=20
High conversion efficiency=20
Low shutdown supply current=20
Low dropout voltage for LDOs=20
LDO1 150mV (typ.) at 300mA=20
LDO2 150mV (typ.) at 300mA=20
Low output voltage noise=20
<30=B5VRMS (typ.) for LDO2 (VCO Supply)=20
PG_LDO & PG_PWM ( PWM & LDO) Outputs=20
Extensive circuit protection and monitoring features=20
PWM Over voltage protection=20
Over current protection=20
Shutdown=20
Thermal shutdown=20
Integrated RESET output for microprocessor reset=20
Proven reference design for total WLAN system solution=20
QFN package=20
Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outlin=
e=20
Lead (Pb) - free packaging=20

Applications=20
 =20
WLAN Cards=20
PCMCIA, Cardbus32, MiniPCI Cards=20
Compact Flash Cards=20
Hand-Held Instruments=20

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