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Features
* * * * * * * * *
Low-noise Low Drop Out Voltage Regulator 2.8V Fixed Output Voltage 3V to 5.5V Supply Operation 130 mA Maximum Load Current Power-down Mode Consumption Less Than 1 A More Than 70 dB (Typical) PSRR at 1 kHz 29 VRMS Output Noise 0.35 m CMOS Technology Typical Application: Radio Section Supply in Mobile Terminals
Description
RE027 is a Low Drop Out (LDO) voltage regulator macrocell with a fixed 2.8V output voltage, rated for loads up to 130 mA. It is designed to be integrated with other analog cells, digital logic, microcontrollers, DSP cores and memory blocks into system-onchip products. 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. Double pads on the supply voltage VBAT3B/VBAT3BB and output voltage VCRADIOA/VCRADIOAA are used to reduce the total output resistance. 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 VCRADIOS 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 double-bonding, thus avoiding the bonding resistance influence). A capacitor of 2.2 F connected from V CRADIOA/V CRADIOAA to ground is needed as external compensation. Figure 1. Symbol(1)
vbat3b vbat3bb
Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE027 Fixed 2.8V 130 mA Low-noise LDO Voltage Regulator
vsauvc vbg
vcradioa vcradioaa on6 vcradios
vcradioc
gnd3
Note:
1. Pin names are written as they appear on the user screen when the symbol is opened in the design tool environment.
Rev. 2701B-PMGMT-02/03
1
Functional Diagram
Figure 2. Functional Diagram
VBAT3B VSAUVC VBAT3BB
ON6 ON6 IBIAS VBG ON6 Pass Device VCRADIOC VCRADIOA GND3 GND3 Current Sensing and Limiter R1 GND3 VCRADIOAA VCRADIOS
ON6
R2
ON6
GND3
Pin Description
Pin Name VBAT3B VBAT3BB VCRADIOA VCRADIOAA VCRADIOS VCRADIOC GND3 VSAUVC VBG ON6 I/O Power supply Power supply Analog output Analog output Analog input Analog output Ground Power supply Analog input Digital input Type External pad External pad External pad External pad External pad Internal pin Internal pin Internal pin Internal pin Internal pin Function Power supply Power supply Output voltage Output voltage Sense voltage Output voltage Ground Power supply Voltage reference Enable command Value 3V to 5.5V 3V to 5.5V 2.75V to 2.85V 2.75V to 2.85V 2.75V to 2.85V 2.75V to 2.85V 0 2.5V 0.1V 1.231V 0V or VBAT3B/VBAT3BB
2
RE027 2.8V 130 mA LDO Voltage Regulator
2701B-PMGMT-02/03
RE027 2.8V 130 mA 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, VBAT3B/VBAT3BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 F. Table 1. Electrical Characteristics
Symbol VBAT3B/VBAT3BB VSAUVC Parameter Operating Supply Voltage Auxiliary Operating Supply Voltage Junction Temperature Range Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation Load Regulation Transient Load Regulation ICRADIOA/ICRADIOAA = 130 mA ICRADIOA/ICRADIOAA = 130 mA rise time = fall time = 5 s 10% - 90% of max ICRADIOA/ICRADIOAA; VBAT3B/VBAT3BB = 5.5V 10% - 90% of max ICRADIOA/ICRADIOAA; rise time = fall time = 5 s @100 Hz @1 kHz VBAT = 3V @20 kHz @100 kHz @100 Hz PSRR Power Supply Rejection Ratio at Full Load @1 kHz VBAT = 4.25V @20 kHz @100 kHz @100 Hz @1 kHz VBAT = 5.5V @20 kHz @100 kHz 195 2 2 2 2 -75 -75 -50 -40 -75 -75 -70 -55 -75 -75 -70 -55 Condition Min 3 2.4 -20 2.75 2.8 2.5 Typ Max 5.5 2.6 125 2.85 130 236 3 3 3 3 Unit V V C V mA A mV mV mV mV dB dB dB dB dB dB dB dB dB dB dB dB
TJ
VCRADIOA/ VCRADIOAA ICRADIOA/ ICRADIOAA IQQ VDC VTRAN VDC VTRAN
3
2701B-PMGMT-02/03
Table 1. Electrical Characteristics (Continued)
Symbol VN TR ISD ICC Notes: Parameter Output Noise Rise Time Shut Down Current Short-circuit Current Threshold 1. Obtained by considering the parasitics of a TFBGA100 Package. 2. Obtained by using BG019 as reference voltage generator.
(2)
Condition Bandwidth = 10 Hz to 100 kHz; output current = 130 mA 100% of ICRADIOA/ICRADIOAA; 10% - 90% of VCRADIOA/VCRADIOAA
Min
Typ 29
Max 37 50 1 460
Unit VRMS s A mA
4
RE027 2.8V 130 mA LDO Voltage Regulator
2701B-PMGMT-02/03
RE027 2.8V 130 mA LDO Voltage Regulator
Control Modes
All digital signals are referred to the supply voltage VBAT3B/BAT3BB. Table 2. Truth Table
ON6 0 1 VCRADIOA/VCRADIOAA Power down (High-Z) Power on, VCRADIOA/VCRADIOAA = 2.8V
Application Example
A ceramic capacitor of 2.2 F with ESR between 20 m and 250 m connected from VCRADIOA/VCRADIOAA to ground is needed for 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
VBAT3B VBAT3BB
1.231V Bandgap (e.g., BG019)
VBG VCRADIOA VCRADIOAA VCRADIOS
Battery Pack
CL
Digital Core
ON6
VCRADIOC GND3
5
2701B-PMGMT-02/03
Typical Performance Characteristics (Conditions specified on page 8)
Static Line Regulation at Full Load 0.10 Output Voltage Change [mV] 0.05 0.00 -0.05 -0.10 -0.15 -0.20 3 3.5 4 4.5 5 5.5 Battery Voltage [V]
3.5 3.0
O u tp u t V o lta g e C h a n g e [m V ] S ta tic L o a d R e g u la tio n
2.5 2.0 1.5 1.0 0.5 0.0 -0.5 V B A T = 3V -1.0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 V B A T = 4.25V V B A T = 5.5V
O u tp u t C u rre n t [m A ]
Transient Line Regulation at Full Load 2.802
Transient Load Regulation 2.806 2.805 Output Voltage [V]
Output Voltage [V]
2.801
2.804 2.803 2.802 2.801 2.800 2.799 VBAT = 4.25V VBAT = 5.5V VBAT = 3V
2.800
2.799
2.798 0.35
0.4
0.45 Time [ms]
0.5
0.55
2.798 0.35
0.4
0.45 Time [ms]
0.5
0.55
6
RE027 2.8V 130 mA LDO Voltage Regulator
2701B-PMGMT-02/03
RE027 2.8V 130 mA LDO Voltage Regulator
Typical Performance Characteristics (Conditions specified on page 8)
P o w e r S u p p ly R e je ctio n Ra tio a t F u ll L o a d
P o w e r S u p p ly R e je ctio n R a ti o a t F u ll L o a d ve rsu s B a tte ry V o lta g e
10 -30 -35 -40 -45
100
1000
10000
100000
3.0 -30 3.5 4.0 4.5 5.0 5.5
V B A T = 3V
-40 -50 -60
P S RR [d B]
PSRR [ d B]
-50 -55 -60 -65 -70 -75 -80
Fr e q [ Hz ]
-70 -80 -90 -100 -110 -120
B a tte ry V o lta g e [V ]
V B A T = 4.25V V B A T = 5.5V
F req = 1 k Hz F req = 20 k Hz F req = 100 k Hz
F req = 100 Hz
L D O S ta rtu p a t F u ll L o a d fo r V B AT = 4 . 25 V
O u tp u t N o ise S p e ctru m a t F u ll L o a d a n d V B AT = 4.25V
5 4.5 4 3.5
V o l ta g e [V ]
1.0E -11
O u tp u t N o ise [V /sq rt(H z )]
1.0E -12
Total Output Nois e 29 V R MS
3 2.5 2
O N6
1.0E -13
O utput V oltage 1.5 1 0.5 0 0 20 40
T i m e [ s]
1.0E -14
1.0E -15
60 80 100
10
100
1000
F re q [Hz ]
10000
100000
7
2701B-PMGMT-02/03
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
3.4V VBAT3B/VBAT3BB
3V 5 s
VCRADIOA/VCRADIOAA 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 ICRADIOA/ICRADIOAA ICRADIOA/ICRADIOAA 10% of max ICRADIOA/ICRADIOAA 5 s
5 s
VTRAN VCRADIOA/VCRADIOAA VDC
8
RE027 2.8V 130 mA LDO Voltage Regulator
2701B-PMGMT-02/03
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2701B-PMGMT-02/03 0M

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