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RE029 Datasheet

  • RE029

  • RE029 [Updated 3/03. 11 Pages] A dual mode Low Drop Out (LDO...

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  • ETC

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Features
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Dual Mode Low Drop Out Voltage Regulator
1.8V Fixed Output Voltage
3V to 5.5V Supply Operation
80 mA Maximum Load Current in Full Power Mode
Maximum Current Consumption 36 碌A(chǔ) in Full Power Mode and 14 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
46 碌V
RMS
Output Noise
0.35 碌m CMOS Technology
Typical Application: Baseband Memory Section Supply in Mobile Terminals
Description
RE029 is a dual mode Low Drop Out (LDO) voltage regulator macrocell with a fixed
1.8V output voltage, rated for loads up to 80 mA in full power mode and 5 mA in low
power mode. (Both modes can be selected by the LP8 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
BAT1B
/V
BAT1BB
and output voltage V
MLVA
/V
MLVAA
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
MLVS
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
MLVA
/V
MLVAA
to ground is
needed as external compensation.
Figure 1.
Symbol
(1)
Embedded ASIC
Macrocell:
Power
Management for
Mobile
Terminals (PM)
RE029
1.8V 80 mA
Dual Mode LDO
Regulator
Note:
1. Pin names are written as they appear on the user screen when the symbol is
opened in the design tool environment.
Rev. 2705B鈥揚(yáng)MGMT鈥?3/03
1

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