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MIC2215
Micrel
MIC2215
Triple High PSRR, Low Noise Cap LDO
General Description
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 110A 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 1A when all the regulators are disabled. The MIC2215 is a Cap 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 x 4mm MLFTM package. All support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * 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: 110A per regulator Fast turn-on time: 30s Zero off-mode current Thermal shutdown protection Current-limit protection Tiny 16-pin (4mm x 4mm) MLFTM package Cellular phones PCs and peripherals Wireless LAN cards PDAs GPS
* * * * * * * * * * * *
Applications
Typical Application
MIC2215-xxxBML
VIN1 VIN2 VIN3
OFF ON OFF ON OFF ON
VOUT1 VOUT2 VOUT3
Rx Chain Tx Chain Synth/TCXO/VCO
EN1 EN2 EN3 GND CBYP
CIN = 1F Ceramic
COUT = 1F Ceramic
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Ordering Information
Part Number MIC2215-PMMBML MIC2215-PPPBML MIC2215-AAABML
Note: 1. For other voltage options, contact Micrel, Inc.
Voltage(1) VO1/VO2/VO3 3.0V/2.8V/2.8V 3.0/V3.0V/3.0V Adj./Adj./Adj.
Junction Temperature Range -40C to +125C -40C to +125C -40C to +125C
Package 16-Pin MLFTM 16-Pin MLFTM 16-Pin MLFTM
Voltage Adj. 1.5 1.6 1.8 1.85 1.9 2.0 2.1 2.5 2.6 2.65 2.7 2.8 2.85 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
Code A F W G D Y H E J K I L M N O P Q R S T U V
Table 1. Voltage Codes
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OUT1 ADJ1 ADJ3 OUT3 OUT1 NC OUT3 OUT3
16 15 14 13 OUT1 VIN1 VIN2 OUT2 1 2 3 4 5678 12 11 10 9 VIN3 GND GND BYP
Pin Configuration
16 15 14 13 OUT1 VIN1 VIN2 OUT2 1 2 3 4 5678
ADJ2 EN1 EN2 EN3
12 11 10 9
VIN3 GND GND BYP
OUT2 EN1 EN2 EN3
MIC2215-xxxBML (ML) (Fixed)
MIC2215-AAABML (ML) (Adjustable)
Pin Description
Fixed Output VOUT1 VIN1 VIN2 VOUT2 VOUT2 -- EN1 EN2 EN3 CBYP GND GND VIN3 VOUT3 VOUT3 -- N/C -- VOUT1 GND Adj. Output VOUT1 VIN1 VIN2 VOUT2 -- ADJ2 EN1 EN2 EN3 CBYP GND GND VIN3 VOUT3 -- ADJ3 -- ADJ1 VOUT1 GND Pin Number 1 2 3 4 5 5 6 7 8 9 10 11 12 13 14 14 15 15 16 Exposed Pad 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 0.01F 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.
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .................................. 0V to +7V Enable Input Voltage (VEN) ................................. 0V to +7V Power Dissipation (PD) ........................ Internally Limited(3) Junction Temperature (TJ) ....................... -40C to +125C Storage Temperature (TS) ......................... -65C to 150C Lead Temperature (soldering, 5 sec.) ....................... 260C
Operating Ratings(2)
Supply Input Voltage (VIN1) ..................................................... +2.25V to +5.5V (VIN2, VIN3) ............................................... +2.25V to VIN1 Enable Input Voltage (VEN) ................................. 0V to VIN1 Junction Temperature (TJ) ....................... -40C to +125C Package Thermal Resistance MLFTM (JA) ......................................................... 45C/W
Electrical Characteristics(4)
VIN1 = VIN2 = VIN3 = VOUT (highest nominal) +1.0V; COUT = 1.0F, IOUT = 100A; TJ = 25C, bold values indicate -40C to + 125C; unless noted. Parameter Output Voltage Accuracy Output Voltage Temp. Coefficient Line Regulation Load Regulation Dropout Voltage VIN = VOUT +1V to 5.5V IOUT = 100A to 250mA IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA IOUT = 250mA Ground Current IOUT1 = IOUT2 = IOUT3 = 100A IOUT1 = 100A; IOUT2/IOUT3 = off IOUT1 = IOUT2 = IOUT3 = 250mA Quiescent Current Ripple Rejection VEN1 = VEN2 = VEN3 = 0V VIN = VOUT + 1.0V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1F VIN = VOUT + 0.4V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1F VIN = VOUT + 0.2V, IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1F Current Limit Output Voltage Noise Turn-On Time Enable Input Enable Input Voltage Logic Low (Regulator shutdown) Logic High (Regulator enabled) Enable Input Current VIL < 0.4V (Regulator shutdown) VIH > 1.5V (Regulator enabled)
Notes: 1. Exceeding maximum ratings may damage the device. 2. The device is not guaranteed to work outside its operating ratings. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Specification for packaged product only.
Conditions
Min -1.0 -2.0
Typ
Max +1.0 +2.0
Units % % ppm/C
40 0.015 0.3 2 32 63 100 170 280 110 420 0.2 70 60 45 350 700 30 30 100 150 275 400 150 550 1 0.3 0.5
%/V % mV mV mV mV mV A A A A dB dB dB mA Vrms s
VOUT = 0V (All regulators) CBYP = 0.1F, f =10Hz to 100kHz CBYP = 0.01F
0.4 1.5 1.0 0.01
V V A A
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Typical Characteristics
TA = +25C, unless otherwise noted.
Ground Current vs. Temperature for LDO 1
160 GROUND CURRENT (A) 140 120 LOAD = 50mA 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) LOAD = 0mA LOAD = 100mA GROUND CURRENT (A) 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) LOAD = 50mA LOAD = 0mA
Ground Current vs. Temperature for LDO 2
LOAD = 100mA GROUND CURRENT (A) 140 120 100
Ground Current vs. Temperature for LDO 3
LOAD = 100mA LOAD = 50mA
80 LOAD = 0mA 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Output Voltage vs. Temperature for LDO 1
3.03 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 3.02 3.01 3.00 2.99 2.98 2.97 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 3.03 3.02 3.01 3.00 2.99 2.98
Output Voltage vs. Temperature for LDO 2
3.03 OUTPUT VOLTAGE (V) 3.02 3.01 3.00 2.99 2.98
Output Voltage vs. Temperature for LDO 3
2.97 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
2.97 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Dropout Voltage vs. Temperature for LDO 1
250 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 200 250mA LOAD 150 100 150mA LOAD 250 200
Dropout Voltage vs. Temperature for LDO 2
250 DROPOUT VOLTAGE (mV) 200
Dropout Voltage vs. Temperature for LDO 3
250mA LOAD 150 100 150mA LOAD
250mA LOAD 150 150mA LOAD 100 50 50mA LOAD
50 50mA LOAD 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) VOUT = 3V
50 50mA LOAD 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) VOUT = 3V
VOUT = 3V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Enable Threshold vs. Supply Voltage for LDO 1
1.4 ENABLE THRESHOLD (V) ENABLE THRESHOLD (V) 1.2 1 0.8 Enable OFF 0.6 0.4 0.2 0 2.25 3 3.75 4.5 5.25 SUPPLY VOLTAGE (V) Enable ON
Enable Threshold vs. Supply Voltage for LDO 2
1.4 1.2 1 0.8 Enable OFF 0.6 0.4 0.2 0 2.25 3 3.75 4.5 5.25 SUPPLY VOLTAGE (V) ENABLE THRESHOLD (V) Enable ON
Enable Threshold vs. Supply Voltage for LDO 3
1.4 1.2 1 0.8 Enable OFF 0.6 0.4 0.2 0 2.25 3 3.75 4.5 5.25 SUPPLY VOLTAGE (V) Enable ON
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Enable Delay vs. Supply Voltage
50 GROUND CURRENT (A) 45 40 DELAY (s) 35 30 25 20 15 10 5 0 2.25 LDO 3 CBYP = 0.1F 3 3.75 4.5 5.25 SUPPLY VOLTAGE (V) LDO 1 LDO 2 160 140 120 100 80 60 40 20
Ground Current vs. Load Current for LDO 1
160 GROUND CURRENT (A) 50 100 150 200 250 OUTPUT CURRENT (mA) 140 120 100 80 60 40 20
Ground Current vs. Load Current for LDO 2
0 0
0 0
50 100 150 200 250 OUTPUT CURRENT (mA)
Ground Current vs. Load Current for LDO 3
160 GROUND CURRENT (A) OUTPUT VOLTAGE (V) 140 120 100 80 60 40 20 0 0 50 100 150 200 250 OUTPUT CURRENT (mA) 3.020 3.015 3.010 3.005 3.000 2.995 2.990 2.985 2.980 0
Load Regulation LDO 1
OUTPUT VOLTAGE (V)
3.020 3.015 3.010 3.005 3.000 2.995 2.990 2.985 2.980 0
Load Regulation LDO 2
50 100 150 200 250 OUTPUT CURRENT (mA)
50 100 150 200 250 OUTPUT CURRENT (mA)
3.020 OUTPUT VOLTAGE (V) 3.015 3.010 3.005 3.000 2.995 2.990 2.985 2.980 0
Load Regulation LDO 3
DROPOUT VOLTAGE (mV)
Dropout Voltage vs. Output Current for LDO 1
180 140 120 100 80 60 40 20 0 0 50 100 150 200 250 OUTPUT CURRENT (mA) DROPOUT VOLTAGE (mV) 160
Dropout Voltage vs. Output Current for LDO 2
180 160 140 120 100 80 60 40 20 0 0 50 100 150 200 250 OUTPUT CURRENT (mA)
50 100 150 200 250 OUTPUT CURRENT (mA)
Dropout Voltage vs. Output Current for LDO 3
180 DROPOUT VOLTAGE (mV) GROUND CURRENT (A) 160 140 120 100 80 60 40 20 0 0 50 100 150 200 250 OUTPUT CURRENT (mA)
Ground Current vs. Supply Voltage for LDO 1
200 250mA 150mA 100A GROUND CURRENT (A) 180 160 140 120 100 80 60 40 20 0 0
Ground Current vs. Supply Voltage for LDO 2
200 180 160 140 120 100 80 60 40 20 0 0 250mA
150mA 100A
VOUT = 3V 1 2 3 4 5 SUPPLY VOLTAGE (V)
VOUT = 3V 1 2 3 4 5 SUPPLY VOLTAGE (V)
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Ground Current vs. Supply Voltage for LDO 3
200 GROUND CURRENT (A) OUTPUT VOLTAGE (V) 180 160 140 120 100 80 60 40 20 0 0 250mA
Output Voltage vs. Supply Voltage for LDO 1
3.5 OUTPUT VOLTAGE (V) 3 2.5 2 1.5 1 0.5 0 0 10mA 250mA 1 2 3 4 5 SUPPLY VOLTAGE (V) 100A
Output Voltage vs. Supply Voltage for LDO 2
3.5 3 2.5 2 1.5 1 0.5 0 0 10mA 250mA 1 2 3 4 5 SUPPLY VOLTAGE (V) 100A
150mA 100A
VOUT = 3V 1 2 3 4 5 SUPPLY VOLTAGE (V)
Output Voltage vs. Supply Voltage for LDO 3
3.5 OUTPUT VOLTAGE (V) 3 2.5 2 100A 1.5 1 0.5 0 0 10mA 250mA 1 2 3 4 5 SUPPLY VOLTAGE (V) PSRR (dB)
-90 -80 -70 -60 -40 -30 -20 -10
Power Supply Rejection Ratio 3VOUT
1V 1.0V V
90 80 60 50
Power Supply Rejection Ratio vs. CBYPASS
400mV V 1.2V V 600mV 2V V PSRR (dB)
CBYP = 1F CBYP = 0.1F CBYP = 10nF 70
400mV -50 200mV V 200mV CBYP = 0.1F VIN = VOUT + V ILOAD = 150mA 10K 100K 1K FREQUENCY (Hz) 1M
40 CBYP = 1nF CBYP = 0 30 20 10 0 100 VIN = VOUT +1V ILOAD = 150mA 1K 10K 100K 1M FREQUENCY (Hz)
0 100
Power Supply Rejection Ratio
80 70 60 LDO 1 LDO 2 50 LDO 3 40 30 20 10 0 100 VIN = VOUT + 1V CBYP = 0.1F ILOAD = 150mA 1K 10K 100K FREQUENCY (Hz) 1M
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Functional Diagram
VIN1 EN1 Error Amp Current Limit
VOUT1
VIN1 EN1 Error Amp Current Limit
VOUT1
VIN2 EN2 Error Amp Current Limit
ADJ1 VOUT2
VIN2 EN2 Error Amp Current Limit
VOUT2
VIN3 EN3 Error Amp GND Current Limit
ADJ2 VOUT3
VIN3 EN3 Error Amp Current Limit
VOUT3
ADJ3
GND
Thermal Limit
VREF
QuickStart
BYP
Thermal Limit
VREF
QuickStart
BYP
MIC2215 Block Diagram (Adjustable)
MIC2215 Block Diagram (Fixed)
General 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 MLFTM package.
The MIC2215 is specifically designed to work with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, which is critical in handheld wireless devices.
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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. 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) / JA (max) is the maximum junction temperature of the die, TJ 125C, and TA is the ambient operating temperature. JA is layout dependent; Table 2 shows examples of the junctionto-ambient thermal resistance for the MIC2215. JA Recommended Package Minimum Footprint 16-Pin MLFTM 43C/W Table 2. MLFTM Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: PDTOTAL = PDLDO1 + PDLDO2 + PDLDO3 PDLDO1 = (VIN1 - VOUT1) x IOUT1 PDLDO2 = (VIN2 - VOUT2) x IOUT2 PDLDO3 = (VIN3 - VOUT3) x 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 60C with a minimum footprint layout, the maximum load currents can be calculated as follows: PD (max) = (125C - 60C)/43 C/W PD (max) = 1.511W The junction-to-ambient thermal resistance for the minimum footprint is 43C/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) x IOUT1 PDLDO1 = (4.2V - 2.8V) x 250mA PDLDO1 = 350mW
Applications 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" off-mode-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 20A for the reference will be drawn through VIN1. All three must be disabled to enter the "zero" current-off-mode-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. Input Capacitor The MIC2215 is a high performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A small 0.1F capacitor placed close to the input is recommended to aid in noise performance. Low-ESR ceramic capacitors provide optimal performance at a minimum 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. Output Capacitor The MIC2215 requires an output capacitor for stability. The design requires 1F or greater on the output to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. X7R/X5R dielectric-type 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. 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 0.1F 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. Internal Reference The internal bandgap, or reference, is powered from the VIN1 input. Due to some of the input noise (PSRR) contributions being imposed on the bandgap, it is important to make VIN1 as clean as possible with good bypassing close to the input.
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PDLDO2 = (VIN2 - VOUT2) x IOUT2 PDLDO2 = (4.2V - 3.0V) x 100mA PDLDO2 = 120mW PDLDO3 = (VIN3 - VOUT3) x IOUT3 PDLDO3 = (4.2V - 2.8V) x 50mA PDLDO3 = 70mW 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 60C ambient temperature. After the maximum power dissipation has been calculated, it is always a good idea to calculate the maximum ambient temperature for a 125C junction temperature. Calculating maximum ambient temperature as follows: TA (max) = TJ (max) - (PD x JA) TA (max) =125C - (540mW x 43C/W) TA (max) = 101C For more information, please refer to the Designing with Low-
Micrel
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
MIC2215-AAABML OUT1 R1 ADJ1 R2
Dropout Voltage Regulators Handbook.
Figure 1. Adjustable Output
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Package Information
16-Pin (4mm x 4mm) MLFTM (ML)
MICREL, INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131
USA
+ 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.
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