AT73C239 Summary - Mature

Features
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Main Supply 3.0V to 3.6V
Independent 2.5V to 3.6V Auxiliary Supply for Backup Section
Internal State Machine for Startup
25 mA/1.8V-2.75V Linear Low Drop Out Regulator with High PSRR and Low Noise
(LDO1)
30 mA/1.5V-1.8V Linear Low Drop Out Regulator with High PSRR and Low Noise
(LDO2)
60 mA/1.23V-1.5V-1.8V Linear Low Drop Out Regulator with High PSRR (LDO3)
2 mA/1.2V-1.5V-1.8V Linear Low Drop Out Regulator with Very Low Quiescent Current
(LDO4)
HPBG Economic High Performance Voltage Reference for LDO Supply to RF Sections
LPBG Low Power Voltage Reference to LDO4 During Backup Battery Operation
Internal Oscillator Generates Internal Master Clock
Internal Reset Generator for Main Supply
Additional External Reset Input
Two Wire Interface (TWI) for Independent Activation and Output Voltage Programming
for Each LDO
Available in 3 x 3 x 0.9 mm 16-pin QFN Package
Applications: GPS Modules, WLAN Devices, Wireless Modules
1. Description
The AT73C239 is a 4-channel Power Supply Power Management Unit (PMU) available in a QFN 3 x 3 mm package. It is a fully integrated, low cost, combined Power
Management device for wireless modules, GPS and WLAN devices. It integrates four
Linear Low Drop Out (LDO) Regulators, three of which provide high-accuracy RF performance and one (LDO4) with very low quiescent current that is supplied by an
external backup battery. A Low Power Bandgap (LPBG) requiring no external capacitor for decoupling, is used as reference voltage for LDO4 and starts when VBAT is
present. LDO4 regulates output voltage with extremely low quiescent current, maximizing the lifetime of the backup battery. An Internal State Machine manages the
startup of the other LDOs in the order of LDO3 then LDO1 then LDO2. An economic
High Power Bandgap (HPBG) provides highly accurate, low noise voltage reference
to LDOs 1, 2, 3. HPBG operates in switching mode thereby decreasing its current consumption and becomes inactive when not directly supplied by VIN current. When the
RF LDOs are in idle mode, quiescent current is decreased to a minimum.
Power
Management for
Mobiles (PM)
AT73C239
4-channel Power
Management for
Wireless
Modules
Summary
The AT73C239 features a Two-wire Interface (TWI) to increase the efficiency of the
system by disabling LDOs when not needed.
6201AS–PMAAC–24-Oct-05
2. Block Diagram
Figure 2-1.
AT73C239 Functional Block Diagram
LDO1
VBG
HPBG
VDD1
VDD
3.0V-3.6V
VOUT
1.8V or 2.75V
GNDA/AVSS
ILOAD 25 mA
VO1
Internal Oscillator
XRESIN
LDO2
XRESO
Reset Generator
TWCK
TWI
TWD
State Machine
GNDD
VDD
3.0V-3.6V
VOUT
1.5V or 1.8V
ILOAD 30 mA
Fuse1
VDD2
VO2
Fuse2
VZAP
VMON
POR1
VBAT
VO4
POR1
VDD3
LDO4
LDO3
VDD
2.5V-3.6V
VDD
3.0V-3.6V
VOUT
1.2V or 1.5V or 1.8V
VOUT
1.23V or 1.5V or 1.8V
ILOAD 2 mA
ILOAD 60 mA
VO3
LPBG
2
AT73C239 Summary
6201AS–PMAAC–24-Oct-05
AT73C239 Summary
Revision History
Doc. Rev
Date
Comments
6201AS
01-Sep-05
First issue
Change Request Ref.
3
6201AS–PMAAC–24-Oct-05
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