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Features
* * * * * * * * * *
Low-noise Low Drop Out Voltage Regulator 2.6V Fixed Output Voltage 3V to 5.5V Supply Operation 160 mA Maximum Load Current Less Than 46 A (max) Quiescent Current Power-down Mode Consumption Less Than 1 A More Than 60 dB (Typical) PSRR at 1 kHz 68 VRMS Output Noise 0.35 m CMOS Technology Typical Application: Baseband Section Supply in Mobile Terminals
Description
RE023 is a Low Drop Out (LDO) voltage regulator macrocell with a fixed 2.6V output voltage, rated for loads up to 160 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 VBAT2B/V BAT2BB and output voltage VANINTA/VANINTAA 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 V SAUVC. Remote sense terminal VANINTS 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 ceramic capacitor of 2.2 F connected from VANINTA/VANINTAA to ground is needed as external compensation. Figure 1. Symbol(1)
vbat2b vbat2bb
Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE023 Fixed 2.6V 160 mA LDO Voltage Regulator
vsauvc vbg
vaninta vanintaa on1 vanints
vanintc
gnd2
Note:
1. Pin names are written as they appear on the user screen when the symbol is opened in the design tool environment.
Rev. 2702A-01/02
1
Functional Diagram
Figure 2. Functional Diagram
VBAT2B VSAUVC VBAT2BB
ON1 ON1 IBIAS VBG ON1 Pass Device VANINTC VANINTA GND2 GND2 Current Sensing and Limiter R1 GND2 VANINTAA VANINTS
ON1
R2
ON1
GND2
Pin Description
Pin Name VBAT2B VBAT2BB VANINTA VANINTAA VANINTS VANINTC GND2 VSAUVC VBG ON1 I/O Power supply Power supply Analog output Analog output Analog output 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 2.5V to 2.7V 2.5V to 2.7V 2.5V to 2.7V 2.5V to 2.7V 0 2.5V 0.1V 1.231V 0 or VBAT2B/VBAT2BB
2
RE023 2.6V 160 mA LDO Voltage Regulator
2702A-01/02
RE023 2.6V 160 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, VBAT2B/VBAT2BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 F. Table 1. Electrical Specifications
Symbol VBAT2B/VBAT2B
B
Parameter Operating Supply Voltage Auxiliary Operating Supply Voltage Junction Temperature Range Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation
Condition
Min 3 2.4 -20 2.5
Typ
Max 5.5
Unit V V C V mA A mV mV
VSAUVC
2.5
2.6 125
TJ
VANINTA/ VANINTAA IANINTA/ IANINTAA IQQ VDC VTRAN
2.6
2.7 160 46
VBAT2B/VBAT2BB: 3.4V to 3V; IANINTA/IANINTAA = 160 mA VBAT2B/VBAT2BB: 3.4V to 3V; IANINTA/IANINTAA = 160 mA rise time = fall time = 5 s 10% - 90% of max IANINTA/IANINTAA 10% - 90% of max IANINTA/IANINTAA; rise time = fall time = 5 s
0.2 3.6
0.235 6.9
VDC VTRAN
Load Regulation Transient Load Regulation
0.6 4.8
6.95 9.3
mV mV
3
2702A-01/02
Table 1. Electrical Specifications (Continued)
Symbol Parameter Condition @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 VN TR ISD ICC Notes: 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. Bandwidth: 10 Hz to 100 kHz; output current = 160 mA 100% of IANINTA/IANINTAA; 10% - 90% VANINTA/VANINTAA Min -70 -68 -46 -36 -64 -64 -50 -41 -59 -59 -50 -42 68 Typ Max -57 -55 -35 -26 -56 -56 -50 -41 -51 -51 -47 -40 81 70 1 400 Unit dB dB dB dB dB dB dB dB dB dB dB dB VRMS s A mA
4
RE023 2.6V 160 mA LDO Voltage Regulator
2702A-01/02
RE023 2.6V 160 mA LDO Voltage Regulator
Control Modes
All digital signals are referred to the supply voltage VBAT2B/BAT2BB. Table 2. Truth Table
ON1 0 1 VANINTA/VANINTAA Power down (High-Z) Power on, VANINTA/VANINTAA = 2.6V
Application Example
A ceramic capacitor of 2.2 F with ESR between 20 m and 250 m connected from VANINTA/VANINTAA 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
VBAT2B VBAT2BB
1.231V Bandgap (e.g., BG019)
VBG VANINTA VANINTAA ON1 VANINTS
Battery Pack
CL
Digital Core VANINTC
GND2
5
2702A-01/02
Typical Performance Characteristics (Conditions specified on page 8)
Static Line Regulation at Full Load 1
O u tp u t V o l ta g e C h a n g e [m V ] S ta ti c L o a d Re g u l a tio n
15
Output Voltage Change [mV]
10
0
5
-1
V BAT = 3V
0
V B AT = 4.25V
V BAT = 5.5V
-2
-5
-3 3 3.5 4 4.5 5 5.5 Battery Voltage [V]
-10 0 20 40 60 80 100 120 140 160
O u tp u t Cu rre n t [m A ]
Transient Line Regulation at Full Load 2.598 2.597 2.596 2.595 2.594 2.593 2.592 2.591 2.590 2.589 2.588 0.35 0.4 0.45 Time [ms] 0.5 0.55
2. 588 2. 586 0. 35
O u tpu t V ol ta ge [V ]
Tra nsi e n t L oa d R e gu la tio n
2. 600 2. 598
V BAT = 3V
2. 596 2. 594 2. 592 2. 590
V BA T = 4.25V
Output Voltage [V]
V BAT = 5.5V
0. 4
0. 45
Ti m e [m s]
0.5
0.55
6
RE023 2.6V 160 mA LDO Voltage Regulator
2702A-01/02
RE023 2.6V 160 mA LDO Voltage Regulator
Typical Performance Characteristics (Conditions specified on page 8)
P ow e r S u pp ly R e je ctio n R a tio a t Fu ll Lo a d
P o w e r S u p p ly R e je cti o n R a ti o a t F u l l L o a d ve rsu s Ba tte ry V o lta g e
10 -30
100
1000
10000
100000
3.0 -30
3.5
4.0
4.5
5.0
5.5
-35
-40
-40
P S R R [d B ]
P S R R [d B]
-45 -50 -55 -60 -65
V BAT = 4.25V V BAT = 3V
V BAT = 5.5V
-50
Freq = 1 k Hz
-60 -70 -80
Freq = 100 kHz Freq = 20 k Hz
Freq = 100 Hz
-90
Fre q u e n cy [H z ]
Ba tte ry V o lta g e [V ]
L DO S ta rtup a t F u ll L oa d fo r V B AT = 4 .25 V
O u tp u t N o i se 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 ol ta g e [V ]
1.0E -10
ON1
O u tp u t N o i se [V /sq rt(H z )]
1.0E -11
Total output nois e 68 V R MS
3 2.5 2 1.5 1 0.5 0 0 20 40
Ti m e [ s]
V A N IN T
1.0E -12
1.0E -13
1.0E -14
60 80 100
10
100
1000
F re q u e n cy [H z ]
10000
100000
7
2702A-01/02
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(5.4V)
VBAT2B/VBAT2BB 3V(5V) 5 s VANINTA/VANINTAA 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 IANINTA/IANINTAA IANINTA/IANINTAA 10% of max IANINTA/IANINTAA
5 s
5 s
VANINTA/VANINTAA
VTRAN
VDC
8
RE023 2.6V 160 mA LDO Voltage Regulator
2702A-01/02
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2702A-01/02/0M

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