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 µA More Than 70 dB (Typical) PSRR at 1 kHz 29 µVRMS Output Noise 0.35 µm 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 µF connected from V CRADIOA/V CRADIOAA to ground is needed as external compensation. Figure 1. Symbol(1) vsauvc vbg Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE027 Fixed 2.8V 130 mA Low-noise LDO Voltage Regulator vbat3b vbat3bb vcradioa vcradioaa on6 vcradioc Note: vcradios gnd3 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 VBAT3BB VSAUVC ON6 ON6 IBIAS VBG ON6 Pass Device VCRADIOC VCRADIOA GND3 VCRADIOAA VCRADIOS GND3 ON6 Current Sensing and Limiter R1 GND3 R2 ON6 GND3 Pin Description Pin Name I/O Type Function Value VBAT3B Power supply External pad Power supply 3V to 5.5V VBAT3BB Power supply External pad Power supply 3V to 5.5V VCRADIOA Analog output External pad Output voltage 2.75V to 2.85V VCRADIOAA Analog output External pad Output voltage 2.75V to 2.85V VCRADIOS Analog input External pad Sense voltage 2.75V to 2.85V VCRADIOC Analog output Internal pin Output voltage 2.75V to 2.85V 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 ON6 Digital input Internal pin Enable command 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 *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, VBAT3B/VBAT3BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 µF. Table 1. Electrical Characteristics Symbol Parameter Condition Max Unit VBAT3B/VBAT3BB Operating Supply Voltage 3 5.5 V VSAUVC Auxiliary Operating Supply Voltage 2.4 2.6 V TJ Junction Temperature Range -20 125 °C VCRADIOA/ VCRADIOAA Output Voltage 2.75 2.85 V ICRADIOA/ ICRADIOAA Output Current 130 mA IQQ Quiescent Current 195 236 µA ∆VDC Line Regulation ICRADIOA/ICRADIOAA = 130 mA 2 3 mV ∆VTRAN Transient Line Regulation ICRADIOA/ICRADIOAA = 130 mA rise time = fall time = 5 µs 2 3 mV ∆VDC Load Regulation 10% - 90% of max ICRADIOA/ICRADIOAA; VBAT3B/VBAT3BB = 5.5V 2 3 mV ∆VTRAN Transient Load Regulation 10% - 90% of max ICRADIOA/ICRADIOAA; rise time = fall time = 5 µs 2 3 mV VBAT = 3V PSRR Power Supply Rejection Ratio at Full Load VBAT = 4.25V VBAT = 5.5V Min Typ 2.5 2.8 @100 Hz -75 dB @1 kHz -75 dB @20 kHz -50 dB @100 kHz -40 dB @100 Hz -75 dB @1 kHz -75 dB @20 kHz -70 dB @100 kHz -55 dB @100 Hz -75 dB @1 kHz -75 dB @20 kHz -70 dB @100 kHz -55 dB 3 2701B–PMGMT–02/03 Table 1. Electrical Characteristics (Continued) Symbol Parameter Condition (2) VN Output Noise TR Rise Time ISD Shut Down Current ICC Short-circuit Current Threshold Notes: 4 Min Bandwidth = 10 Hz to 100 kHz; output current = 130 mA 100% of ICRADIOA/ICRADIOAA; 10% - 90% of VCRADIOA/VCRADIOAA Typ Max Unit 29 37 µ VRMS 50 µs 1 µA 460 mA 1. Obtained by considering the parasitics of a TFBGA100 Package. 2. Obtained by using BG019 as reference voltage generator. 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 Application Example ON6 VCRADIOA/VCRADIOAA 0 Power down (High-Z) 1 Power on, VCRADIOA/VCRADIOAA = 2.8V A ceramic capacitor of 2.2 µF with ESR between 20 mΩ and 250 mΩ connected from VCRADIOA/VCRADIOAA to ground is needed for 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 VBAT3B VBAT3BB 1.231V Bandgap (e.g., BG019) VBG Battery Pack VCRADIOA VCRADIOAA VCRADIOS Digital Core CL ON6 VCRADIOC GND3 5 2701B–PMGMT–02/03 Typical Performance Characteristics (Conditions specified on page 8) Static Line Regulation at Full Load S ta tic L o a d R e g u la tio n 3.5 3.0 0.05 O u tp u t V o lta g e C h a n g e [m V ] Output Voltage Change [mV] 0.10 0.00 -0.05 -0.10 -0.15 2.5 2.0 1.5 V B A T = 4.25V 1.0 0.5 V B A T = 5.5V 0.0 -0.5 V B A T = 3V -0.20 -1.0 3 3.5 4 4.5 5 5.5 0 10 20 30 40 Battery Voltage [V] 50 60 70 80 90 100 110 120 130 O u tp u t C u rre n t [m A ] Transient Load Regulation Transient Line Regulation at Full Load 2.806 2.802 2.801 Output Voltage [V] Output Voltage [V] 2.805 2.800 2.799 2.804 2.803 2.802 VBAT = 3V VBAT = 5.5V 2.801 2.800 2.799 VBAT = 4.25V 2.798 0.35 0.4 0.45 Time [ms] 6 0.5 0.55 2.798 0.35 0.4 0.45 0.5 0.55 Time [ms] 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 10 100 1000 10000 100000 3.0 -30 -35 4.0 4.5 5.0 5.5 -40 V B A T = 3V -40 -50 -45 -60 -50 -55 P S RR [d B] PSRR [ d B] 3.5 -30 V B A T = 4.25V -60 V B A T = 5.5V -65 -70 F req = 1 k Hz -80 -90 F req = 20 k Hz F req = 100 k Hz -100 -70 -110 -75 F req = 100 Hz -120 -80 B a tte ry V o lta g e [V ] Fr e q [ Hz ] 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 L D O S ta rtu p a t F u ll L o a d fo r V B AT = 4 . 25 V 1.0E -11 5 O u tp u t N o ise [V /sq rt(H z )] 4.5 4 V o l ta g e [V ] 3.5 O N6 3 2.5 2 O utput V oltage 1.5 1 Total Output Nois e 29 µ V R MS 1.0E -12 1.0E -13 1.0E -14 0.5 1.0E -15 0 0 20 40 60 T i m e [ µ s] 80 100 10 100 1000 10000 100000 F re q [Hz ] 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 µs. Figure 4. Line Regulation 3.4V VBAT3B/VBAT3BB 3V 5 µs 5 µs VCRADIOA/VCRADIOAA ∆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 ICRADIOA/ICRADIOAA ICRADIOA/ICRADIOAA 10% of max ICRADIOA/ICRADIOAA 5 µs 5 µs ∆VTRAN VCRADIOA/VCRADIOAA ∆VDC 8 RE027 2.8V 130 mA LDO Voltage Regulator 2701B–PMGMT–02/03 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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