MIC2210 Datasheet, PDF (9/12 Pages) Micrel Semiconductor – Dual Cap LDO with Open-Drain Driver

MIC2210
Functional Diagram
VIN
LDO1
EN1
OUT1
EN2
CBYP
SW
Reference
LDO2
Error
Comparator
OUT2
ERR
DRV
GND
NGND
MIC2210 Fixed Voltage Block Diagram
VIN
EN1
EN2
CBYP
SW
Reference
LDO1
LDO2
OUT1
ADJ1
Error
Comparator
OUT2
ADJ2
ERR
DRV
GND
NGND
MIC2210 Adjustable Voltage Block Diagram
Micrel
Functional Description
The MIC2210 is a high performance, low quiescent current
power management IC consisting of two µCap low dropout
regulators, an open-drain driver. The first regulator is capable
of sourcing 150mA at output voltages from 1.25V to 5V. The
second regulator is capable of sourcing 300mA of current at
output voltages from 1.25V to 5V. An open-drain driver com-
pletes the power management chipset, offering the capability
of driving LEDs for keypad backlighting in applications such
as cellphones.
Enable 1 and 2
The enable inputs allow for logic control of both output volt-
ages with individual enable inputs. The enable input is active
high, requiring 1.8V for guaranteed operation. The enable
input is CMOS logic and cannot by left floating.
Open-Drain Driver (DRV)
The drive (DRV) pin is an open-drain output capable of sinking
150mA of current. This output is controlled by a logic level
input, the switch (SW) pin. The switch pin is an active high
input and cannot be left floating.
Input Capacitor
Good bypassing is recommended from input to ground to
help improve AC performance. A 1µF capacitor or greater
located close to the IC is recommended.
November 2004
9
MIC2210