MIC2215 Triple High PSRR, Low Noise µCap LDO General Description Features The MIC2215 is a high performance, triple LDO voltage regulator, with each regulator capable of providing 250mA continuous output current. Ideal for battery operated applications, the MIC2215 offers 1% initial accuracy, extremely low dropout voltage (100mV @ 150mA), and low ground current at light load (typically 110µA per regulator). Equipped with a noise bypass pin and featuring very high power supply ripple rejection (PSRR) of up to 80dB, the MIC2215 provides the lowest noise and highest efficiency solution for RF applications in portable electronics such as cellular phones and wireless LAN applications. Equipped with TTL logic-compatible enable pins, each of the regulators in the MIC2215 can be put into a zero current off mode where the supply current is much less than 1µA when all the regulators are disabled. The MIC2215 is a µCap design, which enables a stable output with small ceramic output capacitors, reducing both cost and required board space for output bypassing. The MIC2215 is available in the miniature 16-pin, (4mm×4mm) MLF® package. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • • • Input voltage range: +2.25V to +5.5V 70dB PSRR Stable with ceramic output capacitor High output accuracy: – ±1.0% initial accuracy – ±2.0% over temperature Low dropout voltage of 100mV@150mA Low quiescent current:110µA per regulator Fast turn-on time:30µs Zero off-mode current Thermal shutdown protection Current-limit protection Tiny 16-pin (4mm × 4mm) MLF® package Applications • • • • • Cellular phones PCs and peripherals Wireless LAN cards PDAs GPS ___________________________________________________________________________________________________________ Typical Application MIC2215-xxx_ML VIN1 VOUT1 Rx Chain VIN2 VOUT2 Tx Chain VIN3 VOUT3 OFF ON EN1 OFF ON EN2 OFF ON EN3 CIN = 1µF Ceramic Synth/TCXO/VCO CBYP GND COUT = 1µF Ceramic MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2007 1 M9999-011207 Micrel, Inc. MIC2215 Ordering Information Part Number Part Number Standard (1) Pb-Free Voltage (VO1/VO2/VO3) Junction Temp. Range Package MIC2215-MMMBML MIC2215-MMMYML 2.8V/2.8V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF® MIC2215-PMMBML MIC2215-PMMYML 3.0V/2.8V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF® MIC2215-PPGBML MIC2215-PPGYML 3.0V/3.0V/1.8V –40° to +125°C 16-Pin 4mm x 4mm MLF® MIC2215-PPMBML MIC2215-PPMYML 3.0V/3.0V/2.8V –40° to +125°C 16-Pin 4mm x 4mm MLF® MIC2215-PPPBML MIC2215-PPPYML 3.0V/3.0V/3.0V –40° to +125°C 16-Pin 4mm x 4mm MLF® MIC2215-AAABML MIC2215-AAAYML Adj./Adj./Adj. –40° to +125°C 16-Pin 4mm x 4mm MLF® Note: For other voltage options, contact Micrel for details. Voltage Code Adj. A 1.5 F 1.6 W 1.8 G 1.85 D 1.9 Y 2.0 H 2.1 E 2.5 J 2.6 K 2.65 I 2.7 L 2.8 M 2.85 N 2.9 O 3.0 P 3.1 Q 3.2 R 3.3 S 3.4 T 3.5 U 3.6 V Table 1. Voltage Codes January 2007 2 M9999-011207 Micrel, Inc. MIC2215 OUT3 ADJ3 ADJ1 OUT1 OUT3 OUT3 NC OUT1 Pin Configuration GND VIN2 GND VIN2 GND OUT2 BYP OUT2 BYP EN3 MIC2215-xxx_ML (ML) (Fixed) EN3 VIN1 EN2 GND EN1 VIN1 ADJ2 VIN3 EN2 OUT1 EN1 VIN3 OUT2 OUT1 MIC2215-AAA_ML (ML) (Adjustable) Pin Description Pin Number 1 2 3 4 Pin Name VOUT1 VIN1 VIN2 VOUT2 6 VOUT2 (Fixed) ADJ2 (Adj.) EN1 7 EN2 8 EN3 9 CBYP 10 11 12 13 GND GND VIN3 VOUT3 5 14 15 16 Exposed Pad January 2007 VOUT3 (Fixed) ADJ3 (Adj.) NC (Fixed) ADJ1 (Adj.) VOUT1 GND Pin Function Output voltage of regulator 1 (250mA). Connect externally to pin 16. Supply input of regulator 1 (highest input voltage required for common circuitry). Supply input of regulator 2. Output voltage of regulator 2 (250mA). For fixed output device, connect pins 4 and 5 externally. Output voltage of regulator 2 (250mA). For fixed output device, connect pins 4 and 5 externally. Adjust Input. Feedback input for regulator 2. Enable input to regulator 1. Enables regulator 1 output. Active high input. High = on, low = off. Enable input to regulator 2. Enables regulator 2 output. Active high input. High = on, low = off. Enable input to regulator 3. Enables regulator 3 output. Active high input. High = on, low = off. Reference Bypass: Connect external 0.01µF to GND to reduce output noise. May be left open. Ground. Ground. Supply input of regulator 3. Output voltage of regulator 3 (250mA). For fixed output device, connect pins 13 and 14 externally. Output voltage of regulator 3 (250mA). For fixed output device, connect pins 13 and 14 externally. Adjust Input. Feedback input for regulator 3. No Connect. Not internally connected. Adjust Input. Feedback input for regulator 1. Output voltage of regulator 1 (250mA). Connect externally to pin 1. Ground. 3 M9999-011207 Micrel, Inc. MIC2215 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ............................................... 0V to 7V Enable Voltage (VEN).............................................. 0V to 7V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................–40°C to +125°C Storage Temperature (Ts) .........................–65°C to +150°C Lead Temperature (soldering, 5 sec.)........................ 260°C ESD Rating(4) Supply Voltage (VIN1) ........................................................ 2.25V to 5.5V (VIN2, VIN3) ..................................................2.25V to VIN1 Enable Voltage (VEN).............................................0V to VIN1 Junction Temperature (TJ) ........................ –40°C to +125°C Package Thermal Resistance 4x4 MLF-16 (θJA) ...............................................45°C/W Electrical Characteristics(5) VIN1 = VIN2 = VIN3 = VOUT (highest nominal) +1.0V; COUT = 1.0µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted. Parameter Condition Min Typ –1 –2 Output Voltage Accuracy Output Voltage Temp. Coefficient Max Units +1 +2 % % 40 ppm/C Line Regulation VIN = VOUT +1V to 5.5V 0.015 0.3 Load Regulation IOUT = 100µA to 250mA 0.3 0.5 Dropout Voltage IOUT = 100µA 2 mV IOUT = 50mA 32 mV Ground Current %/V % IOUT = 100mA 63 IOUT = 150mA 100 150 mV mV IOUT = 250mA 170 275 mV IOUT1 = IOUT2 = IOUT3 = 100µA 280 400 µA I OUT1 = 100µA; I OUT2/I OUT3 = off 110 150 µA I OUT1 = I OUT2 = I OUT3 = 250mA 420 550 µA Quiescent Current VEN1 = V EN2 = V EN3 = 0V 0.2 1 µA Ripple Rejection VIN = VOUT +1.0V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF 70 dB VIN = VOUT +0.4V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF 60 dB VIN = VOUT +0.2V, IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF 45 dB 700 mA Current Limit 350 VOUT = 0V (All regulators) Output Voltage Noise CBYP = 0.1µF, f = 10Hz to 100kHz 30 Turn-On Time CBYP = 0.01µF 30 µVRMS 100 µs 0.4 V Enable Input Enable Input Voltage Logic Low (Regulator shutdown) 1.5 Logic High (Regulator enabled) Enable Input Current V VIL < 0.4V (Regulator shutdown) 1.0 µA VIH > 1.5V (Regulator enabled) 0.01 µA Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. January 2007 4 M9999-011207 Micrel, Inc. MIC2215 Typical Characteristics TA = +25°C, unless otherwise noted January 2007 5 M9999-011207 Micrel, Inc. MIC2215 Typical Characteristics (cont.) January 2007 6 M9999-011207 Micrel, Inc. MIC2215 Typical Characteristics (cont.) January 2007 7 M9999-011207 Micrel, Inc. MIC2215 Functional Diagram VIN1 VOUT1 EN1 VIN1 VOUT1 EN1 Current Limit Current Limit Error Amp Error Amp ADJ1 VOUT2 VIN2 Current Limit EN2 VIN2 VOUT2 Current Limit EN2 Error Amp Error Amp ADJ2 VOUT3 VIN3 Current Limit EN3 VIN3 VOUT3 Current Limit EN3 Error Amp Error Amp GND ADJ3 Thermal Limit VREF QuickStart GND Thermal Limit BYP MIC2215 Block Diagram (Adjustable) QuickStart BYP MIC2215 Block Diagram (Fixed) The MIC2215 is specifically designed to work with lowESR ceramic capacitors, reducing the amount of board space necessary for power applications, which is critical in hand-held wireless devices. Functional Description The MIC2215 is a triple, low noise CMOS LDO. Designed specifically for noise-critical applications in handheld or battery-powered devices, the MIC2215 comes equipped with a noise reduction feature to filter the output noise via an external capacitor. Other features of the MIC2215 include a separate logic compatible enable pin for each channel, current limit, thermal shutdown, and ultra-fast transient response, all within a small MLF® package. January 2007 VREF 8 M9999-011207 Micrel, Inc. MIC2215 Internal Reference The internal band gap, or reference, is powered from the VIN1 input. Due to some of the input noise (PSRR) contributions being imposed on the band gap, it is important to make V IN1 as clean as possible with good bypassing close to the input. Application Information Enable/Shutdown The MIC2215 comes with three active-high enable pins that allow control of each individual regulator to be either disabled or enabled. Forcing the enable pin low disables the respective regulator and sends it into a “zero” offmode-current state. In this state, current consumed by the individual regulator goes nearly to zero. This is true for both regulators 2 and 3. Regulator 1’s input supply pin is also used to power the internal reference. When any regulator; either 1, 2, or 3 is enabled, an additional 20µA for the reference will be drawn through VIN1. All three must be disabled to enter the “zero” current-offmode-state. Forcing the enable pin high enables each respective output voltage. This part is CMOS and none of the enable pins can be left floating; a floating enable pin may cause an indeterminate state on the output. Multiple Input Supplies The MIC2215 can be used with multiple input supplies when desired. The only requirement, aside from maintaining the voltages within the operating ranges, is that VIN1 always remains the highest voltage potential. No-Load Stability The MIC2215 will remain stable and in regulation with no load, unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Input Capacitor The MIC2215 is a high performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A small 0.1µF capacitor placed close to the input is recommended to aid in noise performance. Low-ESR ceramic capacitors provide optimal performance at a mini-mum of space. Additional high-frequency capacitors such as small valued NPO dielectric type capacitors help to filter out high frequency noise and are good practice in any RF-based circuit. Thermal Considerations The MIC2215 is designed to provide up to 250mA of current per channel in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: PD(max) = (TJ(max) – TA)÷θJA TJ(max) is the maximum junction temperature of the die, 125°C, and TA is the ambient operating temperature. θJA is layout dependent; Table 2 shows examples of the junction-to-ambient thermal resistance for the MIC2215. Output Capacitor The MIC2215 requires an output capacitor for stability. The design requires 1µF or greater on the output to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. X7R/X5R dielectrictype ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. 16-Pin 4mm x 4mm MLF® 43°C/W ® Table 2. MLF Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: PDTOTAL = PDLDO1 + PDLDO2 + PDLDO3 PDLDO1 = (VIN1 – VOUT1) × IOUT1 PDLDO2 = (VIN2 – VOUT2) × IOUT2 PDLDO3 = (VIN3 – VOUT3) × IOUT3 Substituting PD (max) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC2215 at 60°C with a minimum footprint layout, the maximum load currents can be calculated as follows: PD (max) = (125°C – 60°C)/43 °C/W PD (max) = 1.511W Bypass Pin A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. There is one single internal reference shared by each output, therefore the bypassing affects each regulator. A 0.1µF capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. January 2007 θJA Recommended Minimum Footprint Package 9 M9999-011207 Micrel, Inc. MIC2215 The junction-to-ambient thermal resistance for the minimum footprint is 43°C/W, from Table 2. The maximum power dissipation must not be exceeded for proper operation. Using a lithium-ion battery as the supply voltage, 2.8V/250mA for channel 1, 3V/100mA for channel 2 and 2.8V/50mA for channel 3, maximum power can be calculated as follows: PDLDO1 = (VIN1 – VOUT1) × IOUT1 PDLDO1 = (4.2V – 2.8V) × 250mA PDLDO1 = 350mW Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC2215 can be adjusted from 1.25V to (5.5V–max VDROPOUT) by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: R1 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎠ ⎝ VREF = 1.25V PDLDO2 = (VIN2 – VOUT2) × IOUT2 PDLDO2 = (4.2V – 3.0V) × 100mA PDLDO2 = 120mW MIC2215-AAA_ML OUT1 PDLDO3 = (VIN3 – VOUT3) × IOUT3 PDLDO3 = (4.2V – 2.8V) × 50mA PDLDO3 = 70mW R1 ADJ1 R2 PDTOTAL = PDLDO1 + PDLDO2 + PDLDO3 PDTOTAL = 350mW + 120mW + 70mW PDTOTAL = 540mW The calculation shows that we are well below the maximum allowable power dissipation of 1.511W for a 60°C ambient temperature. After the maximum power dissipation has been calculated, it is always a good idea to calculate the maximum ambient temperature for a 125°C junction temperature. Calculating maximum ambient temperature as follows: TA(max) = TJ(max) – (PD x θJA) TA(max) =125°C – (540mW x 43°C/W) TA(max) = 101°C For more information, please refer to the Designing with Low-Dropout Voltage Regulators Handbook. January 2007 Figure 1. Adjustable Output 10 M9999-011207 Micrel, Inc. MIC2215 Package Information ® 16-Pin (4mm x 4mm) MLF (ML) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. January 2007 11 M9999-011207