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 µA (max) Quiescent Current Power-down Mode Consumption Less Than 1 µA More Than 50 dB (Typical) PSRR at 1 kHz 60 µVRMS Output Noise 0.35 µm 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 µF connected from VRAD to ground is needed as external compensation. Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE028 Fixed 4.5V 30 mA LDO Voltage Regulator Figure 1. Symbol(1) 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 VRAD GND3 VRADS ON7 Current Sensing and Limiter R1 GND3 R2 ON7 GND3 Pin Description Pin Name I/O Type Function Value VIN7 Power supply External pad Power supply 4.75V to 5.5V VRAD Analog output External pad Output voltage 4.4V to 4.6V VRADS Analog input External pad Sense voltage 4.4V to 4.6V VRADC Analog output Internal pin Output voltage 4.4V to 4.6V GND3 Ground Internal pin Ground 0 VSAUVC Power supply Internal pin Power supply 2.5V ± 0.1V VBG Analog input Internal pin Voltage reference 1.231V ON7 Digital input Internal pin Enable command 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 *NOTICE: Digital Signals......................................... -0.3V to 5.5V Output Current..................................Internally Limited Junction Temperature ..........................-40°C to 150°C 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 = -20°C to 125°C, VIN7 = 4.75V to 5.5V unless otherwise specified, output capacitance = 2.2 µF. Table 1. Electrical Specifications Symbol Parameter VIN7 Condition Min Typ Max Unit Operating supply voltage 4.75 5.1 5.5 V VSAUVC Auxiliary operating supply voltage 2.4 2.5 2.6 V TJ Junction temperature range -20 125 °C VRAD Output voltage 4.4 4.6 V IRAD Output current 30 mA IQQ Quiescent current 162 µA ∆VDC Line regulation VIN7 from 4.75V to 5.5V, IRAD = 30 mA 3 mV ∆VTRAN Transient line regulation VIN7 from 4.75V to 5.5V, IRAD = 30 mA, rise time = fall time = 5 µs 35 mV ∆VDC Load regulation 10% to 90% of max IRAD 3 mV ∆VTRAN Transient load regulation 10% to 90% of max IRAD, rise time = fall time = 5 µs 17 mV 138 VIN7 = 4.75V PSRR Power supply rejection ratio 4.5 VIN7 = 5.1V VIN7 = 5.5V @ 100 Hz -60 @ 1 kHz -50 @ 20 kHz -20 @ 100 kHz -20 @ 100 Hz -70 @ 1 kHz -65 @ 20 kHz -45 @ 100 kHz -35 @ 100 Hz -65 @ 1 kHz -60 @ 20 kHz -50 @ 100 kHz -40 dB 3 2704B–PMGMT–03/03 Table 1. Electrical Specifications (Continued) Symbol Parameter Condition VN Output noise (2) TR Rise time ISD Shut down current ICC Short-circuit current Notes: 4 Min Typ Max Unit Bandwidth: 10 Hz to 100 kHz IRAD = 30 mA 60 80 µVrms 100% of IRAD, 10% to 90% of VRAD 230 300 µs 1 µA 100 mA 82 1. Obtained by considering the parasitics of a TFBGA100 Package. 2. Obtained by using BG019 as reference voltage generator. 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 Application Example ON7 VRAD 0 Power down (High-Z) 1 Power on, VRAD = 4.5V A ceramic capacitor of 2.2 µF with ESR between 20 mΩ and 250 mΩ connected from VRAD to ground is needed as external compensation. Description Min Typ Max Units Capacitor, CL 1.8 2.2 2.6 µF 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 VRADS CL Digital Core VRADC GND3 5 2704B–PMGMT–03/03 Typical Performance Characteristics (Conditions specified on page 8) Static Load Regulation at Full Load and VIN7 = 5.1V Static Line Regulation at Full Load Output Voltage Change [mV] Output Voltage Change [mV] 0.25 0.15 0.05 -0.05 -0.15 -0.25 4.75 5 5.25 5.5 Input Voltage [V] Output Current [mA] Transient Load Regulation for VIN7 = 5.1V Transient Line Regulation at Full Load Output Voltage [V] Output Voltage [V] Time [ms] 6 Time [ms] 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 P S R R [d B ] PSRR [dB] 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 a n d V I N7 = 5 .1 V L DO S ta rtu p a t F u ll L o a d a n d V IN7 = 5.1V O u tp u t No i se [V /sq rt(H z )] V o lta g e [V ] 2 1 95$' Total output nois e 60 µ V R MS T im e [µs] 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 µs. Figure 4. Line Regulation 5.5V VIN7 4.75V 5 µs 5 µs VRAD ∆VTRAN ∆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 µs. Figure 5. Load Regulation 90% of max IRAD IRAD 10% of max IRAD VRAD 5 µs 5 µs ∆VTRAN ∆VDC 8 RE028 4.5V 30mA LDO Voltage Regulator 2704B–PMGMT–03/03 Atmel Headquarters Atmel Operations Corporate Headquarters Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany TEL (49) 71-31-67-0 FAX (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France TEL (33) 2-40-18-18-18 FAX (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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