RE023 ATMEL | Alldatasheet
Document overview
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- PDF pages: 9
Technical content
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 µA (max) Quiescent Current
- Power-down Mode Consumption Less Than 1 µA
- More Than 60 dB (Typical) PSRR at 1 kHz
- 68µ VRMS Output Noise
- 0.35 µm 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-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 (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/VBAT2BB 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 VSAUVC. 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., con- necting them at the package pin by double-bonding, thus avoiding the bonding resistance influence). A ceramic capacitor of 2.2 µF connected from VANINTA/VANINTAA to ground is needed as external compensation. Figure 1. Symbol(1)
- Pin names are written as they appear on the user screen when the symbol is
opened in the design tool environment.
Figure 2. Functional Diagram
TJ = -20°C to 125°C, VBAT2B/VBAT2BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 µF. Table 1. Electrical Specifications
- Obtained by considering the parasitics of a TFBGA100 Package.
- Obtained by using BG019 as reference voltage generator.
Table 1. Electrical Specifications (Continued)
RE023 Fixed 2.6V 160mA LDO Voltage Regulator 2702B–PMGMT–02/03 Control Modes All digital signals are referred to the supply voltage VBAT2B/BAT2BB. Application Example A ceramic capacitor of 2.2 µF with ESR between 20 mΩ and 250 mΩ connected from VANINTA/VANINTAA to ground is needed as external compensation. Figure 3. Application Example Table 2. Truth Table Capacitor, CL 1.8 2.2 2.6 µF Digital Core 1.231V Bandgap (e.g., BG019) 2.5V 2.5V Regulator (e.g., RE031) VBAT2B VBAT2BB VANINTA VANINTAA VANINTS VSAUVC VBG ON1 VANINTC Battery Pack GND2 CL
RE023 Fixed 2.6V 160mA LDO Voltage Regulator 2702B–PMGMT–02/03 Typical Performance Characteristics (Conditions specified on page 8) Static Line Regulation at Full Load 3.5 4.5 5.5 Battery Voltage [V] Output Voltage Change [mV] S ta tic Loa d Re gula tion -10 100 120 140 160 Output Curre nt [m A] Output V olta ge Cha nge [m V ] V BAT = 3V V BAT = 4.25V V BAT = 5.5V Transient Line Regulation at Full Load 2.588 2.589 2.590 2.591 2.592 2.593 2.594 2.595 2.596 2.597 2.598 0.35 0.4 0.45 0.5 0.55 Time [ms] Output Voltage [V] Tra nsie nt Loa d Re gula tion 2.586 2.588 2.590 2.592 2.594 2.596 2.598 2.600 0.35 0.4 0.45 0.5 0.55 Tim e [m s] Output V olta ge [V ] V BAT = 3V V BAT = 4.25V V BAT = 5.5V
RE023 Fixed 2.6V 160mA LDO Voltage Regulator 2702B–PMGMT–02/03 Typical Performance Characteristics (Conditions specified on page 8) P ow e r S upply Re je ction Ra tio a t Full Loa d -65 -60 -55 -50 -45 -40 -35 -30 100 1000 10000 100000 Fre que ncy [Hz ] P S RR [dB] V BAT = 3V V BAT = 5.5V V BAT = 4.25V P ow e r S upply Re je ction Ra tio a t Full Loa d ve rsus Ba tte ry V olta ge -90 -80 -70 -60 -50 -40 -30 3.0 3.5 4.0 4.5 5.0 5.5 Ba tte ry V olta ge [V ] P S RR [dB] Freq = 100 Hz Freq = 1 kHz Freq = 20 kHz Freq = 100 kHz Output Noise S pe ctrum a t Full Loa d a nd V B AT = 4.25V 1.0E-14 1.0E-13 1.0E-12 1.0E-11 1.0E-10 100 1000 10000 100000 Fre que ncy [Hz] Output Noise [V/sqrt(Hz)] Total output noise 68 µ V R MS LDO S ta rtup a t Full Loa d for V B AT = 4.25V 0.5 1.5 2.5 3.5 4.5 100 Tim e [µs] V olta ge [V ] ON1 V AN IN T
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