PRELIMINARY
CM9107
Triple-Output LDO for WLAN
Features
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3.0V to 3.6V input voltage range
Preset output voltage with excellent line and load
regulation
LDO1 = 1.80V/500mA, ±1.5% max load regulation
LDO2 = 2.84V/300mA, ±1% max load regulation
LDO3 = 2.84V/200mA, ±1% max load regulation
Low output noise (<30µVrms for LDO3)
Low dropout voltage; 135mV (typ.) for LDO2 at
300mA, and 110mV (typ.) for LDO3 at 200mA.
Low quiescent current, < 600µA typical
Integrated microprocessor RESET circuit with
adjustable RESET delay (2.5ms per
-
nF of C
T
)
Logic controlled shutdown
Power good signal
Built-in power up and power down sequence con
trol between LDO1 and LDO2
Over-temperature and over-current protection
TQFN-16, RoHS compliant lead-free package
Product Description
The CM9107 is a triple-output, low noise, low dropout
(LDO) linear regulator with an integrated microproces
sor reset circuit. It is designed for use with wireless
local-area network chipsets. It has an input voltage
range of 3.0V to 3.6V, and supplies a 500mA, 1.80V
preset output (LDO1); a 300mA, 2.84V output (LDO2),
and a 200mA, low noise output of 2.84V (LDO3). The
CM9107 has excellent line and load regulation over the
operating temperature range.
The CM9107 LDOs features low dropout voltage by
using efficient P-channel MOSFETs for each output. It
also features a power good signal (active high) when
all three LDOs are in regulation. It provides two shut
down control pins, LDO1 and LDO2 power sequencing,
plus short-circuit and over-temperature shutdown pro
tection.
The CM9107 also provides a microprocessor RESET
circuit with RST and RST outputs. The RESET signal
is asserted when the V
IN
supply voltage drops below
2.63V, remaining asserted for the adjustable RESET
delay period, controlled by an external capacitor on the
CT pin.
The CM9107 is packaged in a 16-pin TQFN (4mm x
4mm) package. It can operate over the industrial tem
perature range of –40°C to 85°C.
Applications
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Wireless LAN 802.11 chipset power supply
Wireless LAN cards
Wireless instrumentation
Typical Application
3.0V to 3.6V
10uF
C
IN
16
RST
15
PGOOD
VIN3
14
VIN
13
1 RST
2
0.01uF
C
T
CT
12
VO1
11
C
o1
1.8V, 500mA
Baseband
3.3uF
2.84V, 300mA
C
o2
3.3uF
Processor/
MAC
CM9107
GND3
CB1
10
VO2
CC2
9
C
b
0.033uF
Analog
Circuitry
3 SHDN
4 SHDN3
CC3
VO3
5
6
7
8
2.84V, 200mA
VCO
GND
C
o3
3.3uF
©
2006 California Micro Devices Corp. All rights reserved.
07/11/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.cmd.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
