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Features
* * * * * * * * * *
Low Drop Out Voltage Regulator 4.5V Fixed Output Voltage 4.75V to 5.5V Supply Operation 30 mA Maximum Load Current Less Than 162 A (max) Quiescent Current Power-down Mode Consumption Less Than 1 A More Than 50 dB (Typical) PSRR at 1 kHz 60 VRMS Output Noise 0.35 m CMOS Technology Typical Application: Radio Frequency Synthesizer and Antenna Switch Controller Section Supply in Mobile Terminals
Description
RE028 is a Low Drop Out (LDO) voltage regulator macrocell with a fixed 4.5V output voltage, rated for loads up to 30 mA. It is designed to be integrated with other analog cells, digital logic, microcontrollers, DSP cores and memory blocks into system-onchip products. Furthermore, the RE028 is designed to supply radio frequency synthesizers and used as a controller for the antenna switch. The circuit consists of a PMOS pass device, an error amplifier and a feedback resistive 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 (bandgap voltage) is necessary for correct functionality. The target reference voltage is 1.231V, delivered, for example, by BG019. Current reference is generated inside the cell through a circuit supplied by a 2.5V 0.1V regulated input voltage on VSAUVC. Remote sense terminal VRADS provides regulation at the load by connecting it to the output terminal near a critical point to improve performance of the regulator (e.g., connecting them at the package pin by doublebonding, thus avoiding the bonding resistance influence). A ceramic capacitor of 2.2 F connected from VRAD to ground is needed as external compensation. Figure 1. Symbol(1)
Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE028 Fixed 4.5V 30 mA LDO Voltage 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. 2704B-PMGMT-03/03
1
Functional Diagram
Figure 2. Functional Diagram
VIN7 VSAUVC
ON7 ON7 IBIAS VBG ON7 Pass Device VRADC GND3 GND3 Current Sensing and Limiter R1 GND3 VRAD VRADS
ON7
R2
ON7
GND3
Pin Description
Pin Name VIN7 VRAD VRADS VRADC GND3 VSAUVC VBG ON7 I/O Power supply Analog output Analog input Analog output Ground Power supply Analog input Digital input Type External pad External pad External pad Internal pin Internal pin Internal pin Internal pin Internal pin Function Power supply Output voltage Sense voltage Output voltage Ground Power supply Voltage reference Enable command Value 4.75V to 5.5V 4.4V to 4.6V 4.4V to 4.6V 4.4V to 4.6V 0 2.5V 0.1V 1.231V 0 or VIN7
2
RE028 4.5V 30mA LDO Voltage Regulator
2704B-PMGMT-03/03
RE028 4.5V 30mA LDO Voltage Regulator
Absolute Maximum Ratings*
VIN .......................................................... -0.3V to 6.5V Digital Signals......................................... -0.3V to 5.5V Output Current..................................Internally Limited Junction Temperature ..........................-40C to 150C
*NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Specifications(1)
TJ = -20C to 125C, VIN7 = 4.75V to 5.5V unless otherwise specified, output capacitance = 2.2 F. Table 1. Electrical Specifications
Symbol VIN7 VSAUVC TJ VRAD IRAD IQQ VDC Parameter Operating supply voltage Auxiliary operating supply voltage Junction temperature range Output voltage Output current Quiescent current Line regulation VIN7 from 4.75V to 5.5V, IRAD = 30 mA VIN7 from 4.75V to 5.5V, IRAD = 30 mA, rise time = fall time = 5 s 10% to 90% of max IRAD 10% to 90% of max IRAD, rise time = fall time = 5 s @ 100 Hz @ 1 kHz VIN7 = 4.75V @ 20 kHz @ 100 kHz @ 100 Hz @ 1 kHz PSRR Power supply rejection ratio VIN7 = 5.1V @ 20 kHz @ 100 kHz @ 100 Hz @ 1 kHz VIN7 = 5.5V @ 20 kHz @ 100 kHz -60 -50 -20 -20 -70 -65 dB -45 -35 -65 -60 -50 -40 138 Condition Min 4.75 2.4 -20 4.4 4.5 Typ 5.1 2.5 Max 5.5 2.6 125 4.6 30 162 3 Unit V V C V mA A mV
VTRAN VDC VTRAN
Transient line regulation Load regulation Transient load regulation
35 3 17
mV mV mV
3
2704B-PMGMT-03/03
Table 1. Electrical Specifications (Continued)
Symbol VN TR ISD ICC Notes: Parameter Output noise (2) Rise time Shut down current Short-circuit current 1. Obtained by considering the parasitics of a TFBGA100 Package. 2. Obtained by using BG019 as reference voltage generator. 82 Condition Bandwidth: 10 Hz to 100 kHz IRAD = 30 mA 100% of IRAD, 10% to 90% of VRAD Min Typ 60 230 Max 80 300 1 100 Unit Vrms s A mA
4
RE028 4.5V 30mA LDO Voltage Regulator
2704B-PMGMT-03/03
RE028 4.5V 30mA LDO Voltage Regulator
Control Modes
All digital signals are referred to the supply voltage VIN7. Table 2. Truth Table
ON7 0 1 VRAD Power down (High-Z) Power on, VRAD = 4.5V
Application Example
A ceramic capacitor of 2.2 F with ESR between 20 m and 250 m connected from VRAD to ground is needed as external compensation.
Description Capacitor, CL Min 1.8 Typ 2.2 Max 2.6 Units F
Figure 3. Application Example
2.5V Regulator (e.g., RE031)
2.5V
VSAUVC VIN7
1.231V Bandgap (e.g., BG019)
VBG
Input Supply
VRAD ON7 Digital Core VRADC VRADS
CL
GND3
5
2704B-PMGMT-03/03
Typical Performance Characteristics (Conditions specified on page 8)
Static Line Regulation at Full Load
0.25
Static Load Regulation at Full Load and VIN7 = 5.1V
Output Voltage Change [mV]
5 5.25 5.5
Output Voltage Change [mV]
0.15
0.05
-0.05
-0.15
-0.25 4.75

Output Current [mA]
Input Voltage [V]
Transient Load Regulation for VIN7 = 5.1V
Transient Line Regulation at Full Load

Output Voltage [V]

Time [ms]
Output Voltage [V]

Time [ms]
6
RE028 4.5V 30mA LDO Voltage Regulator
2704B-PMGMT-03/03
RE028 4.5V 30mA LDO Voltage Regulator
Typical Performance Characteristics (Conditions specified on page 8)
Power Supply Rejection Ratio at Full Load and VIN7 = 5.1V

P o w e r S u p p ly R e je ctio n R a tio a t F u ll L o a d ve rsu s In p u t V o lta g e
F req = 100 k Hz
PSRR [dB]
P S R R [d B ]

)UHT
N+ ] )UHT N+ ]

)UHT +]
Frequency [Hz]
In p u t V o lta g e [V ]
O u tp u t No i se S p e c tru m a t F u l l L o a d L DO S ta rtu p a t F u ll L o a d a n d V IN7 = 5.1V a n d V I N7 = 5 .1 V
(
2 1
T im e [s]
O u tp u t No i se [V /sq rt(H z )]
(
Total output nois e 60 V R MS
V o lta g e [V ]
(
95$'
(
(

F re q u e n cy [Hz ]
7
2704B-PMGMT-03/03
Terminology
Line Regulation
Measures the maximum transient and DC variations of the output voltage of the LDO when the supply changes between two specified values with fixed load current; minimum rise time and fall time is 5 s. Figure 4. Line Regulation
5.5V
VIN7 4.75V 5 s VRAD VTRAN 5 s
VDC
Load Regulation
Measures the maximum transient and DC variations of the output voltage of the LDO when the load current changes between two specified values with fixed power supply; minimum rise time and fall time is 5 s. Figure 5. Load Regulation
90% of max IRAD IRAD 10% of max IRAD
5 s
5 s
VRAD
VTRAN
VDC
8
RE028 4.5V 30mA LDO Voltage Regulator
2704B-PMGMT-03/03
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2704B-PMGMT-03/03 0M

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