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RE024 Datasheet

  • RE024

  • RE024 [Updated 2/03. 11 Pages] A dual mode Low Drop Out (LDO...

  • 11頁

  • ETC

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Features
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Dual Mode Low Drop Out Voltage Regulator
2.8V Fixed Output Voltage
3V to 5.5V Supply Operation
160 mA Maximum Load Current in Full Power Mode
Maximum Current Consumption 61 碌A(chǔ) in Full Power Mode and 12 碌A(chǔ) in Low Power Mode
Power-down Mode Consumption Less Than 1 碌A(chǔ)
More Than 70dB (Typical) PSRR at 1 KHz
70 碌V
RMS
Output Noise
0.35 碌m CMOS Technology
Typical Application: Baseband Memory Section Supply in Mobile Terminals
Description
RE024 is a dual mode Low Drop Out (LDO) voltage regulator macrocell with a fixed
2.8V output voltage, rated for loads up to 160 mA in full power mode and 5 mA in low
power mode. (Both modes can be selected by the LP2 signal.) It is designed to be
integrated with other analog cells, digital logic, microcontrollers, DSP cores and mem-
ory blocks into system-on-chip products.
The circuit consists of a PMOS pass device, an error amplifier and a feedback resis-
tive network, sized to achieve the required closed loop gain. These blocks make up
the regulating loop. An over-current and short circuit protection circuit has been
included to limit the output current delivered by the regulator, thus avoiding destruction
in case of a short circuit.
An external reference voltage V
BG
(bandgap voltage) is necessary for correct function-
ality. The target reference voltage is 1.231V delivered, for example, by BG019. Double
pads on the supply voltage V
BAT2C
/V
BAT2CC
and output voltage V
MEMA
/V
MEMAA
are used
to reduce the total output resistance. Current reference is generated inside the cell
through a circuit supplied by a 2.5V 鹵 0.1V of regulated input voltage on V
SAUVC
.
Remote sense terminal V
MEMS
provides regulation of the load by connecting it to the
output terminal near a critical point to improve performance of the regulator (e.g., con-
necting it to the package pin by double-bonding, thus avoiding the bonding resistance
influence). A ceramic capacitor of 2.2 碌F connected from V
MEMA
/V
MEMAA
to ground is
needed as external compensation.
A low-leakage current switch has been added to charge a second external capacitor
(2.2 碌F - 10 碌F) to V
MEMA
/V
MEMAA
. This voltage, called V
BACKUP
is used to guarantee
,
30 minutes of operation time for the internal system clock and calendar in backup
mode when the main battery is unplugged.
Figure 1.
Symbol
(1)
V
SAUVC
V
BG
V
BAT2C
V
BAT2CC
V
MEMA
ON2
LP2
BACKUPON
Embedded ASIC
Macrocell:
Power
Management for
Mobile
Terminals (PM)
RE024 2.8V
160 mA
Dual Mode LDO
Regulator
V
MEMAA
V
MEMS
V
BACKUP
V
MEMC
GND2
V
BACKUPC
Note:
1. Pin names are written as they appear on the user screen when the symbol is
opened in the design tool environment.
Rev. 2703B-PMGMT鈥?2/03
1

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