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MIC5311
LowQTM Mode Dual 300mA LDO
General Description
The MIC5311 is a high performance, dual Cap low dropout regulator offering ultra-low operating current and a second, even lower operating current mode, LowQTM mode, reducing operating current by 75%. Each regulator can source up to 300mA of output current maximum. Ideal for battery operated applications, the MIC5311 offers 1% accuracy, extremely low dropout voltage (60mV @ 150mA), and low ground current (typically 28A total). When put into LowQTM mode, the internal current draw drops down to 7A total. The MIC5311 also comes equipped with a TTL logic compatible enable pin that allows the part to be put into a zero-offmode current state, drawing no current when disabled. The MIC5311 is a Cap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5311 is available in fixed output voltages in the 3mm x 3mm MLF-10 leadless package. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* Input voltage range: 2.5V to 5.5V * LowQTM Mode - 7A total quiescent current - 10mA output current capable LowQTM mode - Logic level control with external pin * Stable with ceramic output capacitor * 2 LDO Outputs - 300mA each * Tiny 3mm x 3mm MLFTM-10 package * Low dropout voltage of 60mV @ 150mA * Ultra-low quiescent current of 28A total in Full Current Mode * High output accuracy - 1.0% initial accuracy - 2.0% over temperature * Thermal Shutdown Protection * Current Limit Protection
Applications
* * * * Cellular/PCS phones Wireless modems PDAs MP3 Players
Typical Application
VIN EN1 EN2 LOWQ BYP GND Baseband Processor VOUT1 VOUT2 VCORE VI/O
MIC5311-xxBML
MLF and MicroLeadFrame are 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
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Micrel, Inc.
MIC5311
Ordering Information
Part Number MIC5311-GMBML MIC5311-DKBML Output Voltage* 1.8V/2.8V 1.85V/2.6V Junction Temp. Range -40C to +125C -40C to +125C Package 10-Pin 3x3 MLFTM 10-Pin 3x3 MLFTM
Note: *Other Voltage options available between 1.25V and 5V. Contact Micrel for details.
Pin Configuration
VIN 1 EN1 2 EN2 3 LOWQ 4 BYP 5 10 VOUT1 9 VOUT2 8 NC 7 NC 6 GND
MIC5311-xxBML (3x3)
Pin Description
Fixed 1 2 3 4 5 6 7 8 9 10 EP Pin Name VIN EN1 EN2 LowQTM BYP GND NC NC VOUT2 VOUT1 GND Pin Function Supply Input. (VIN1 and VIN2 are internally tied together) Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off; Do not leave floating LowQTM Mode. Active Low Input. Logic High = Full Power Mode; Logic Low = Light Load Mode; Do not leave floating. Reference Bypass: Connect external 0.01F to GND to reduce output noise. May be left open. Ground.
Output of regulator 2 Output of regulator 1 Ground. Internally connected to the Exposed Pad.
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MIC5311
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .............................. 0V to 6V Enable Input Voltage (VEN)............................. 0V to 6V LowQTM Input Voltage (VLowQTM)...................... 0V to 6V Power Dissipation (PD) ..................Internally Limited (3) Junction Temperature ....................... -40C to +125C Lead Temperature (soldering, 5sec.) .................260C Storage Temperature (Ts) ................. -65C to +150C
Operating Ratings(2)
Supply Input Voltage (VIN)..........................2.5V to 5.5V Enable Input Voltage (EN1/EN2/LowQTM) ...... 0V to VIN Junction Temperature (TJ) .................. -40C to +125C Package Thermal Resistance MLF-10 (JA) ................................................. 63C/W
Electrical Characteristics (Full Power Mode)
VIN = VOUT + 1.0V for higher output of the regulator pair; LowQTM = VIN; COUT = 2.2F, IOUT = 100A; TJ = 25C, bold values indicate -40C to +125, unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT +1V to 5.5V IOUT = 100A to 150mA IOUT = 100A to 300mA IOUT = 150mA IOUT = 300mA IOUT1 = IOUT2 = 100A to 300mA VEN < 0.2V Min -1.0 -2.0 Typ Max +1.0 +2.0 0.3 0.6 1.0 1.5 240 45 50 Units % % %/V % % mV mV A A A dB dB mA Vrms V V A A s s s
0.02 0.35 0.7 60 120 28 0.1 65 35 450 45
f = up to 1kHz; COUT = 2.2F ceramic; CBYP = 10nF f = 1kHz - 20kHz; COUT = 2.2F ceramic; CBYP = 10nF Current Limit VOUT = 0V (Both Regulators) Output Voltage Noise COUT = 2.2F, CBYP = 0.01F, 10Hz to 100kHz Enable and LowQTM Input (EN1/EN2/LowQTM) Enable Input Voltage Logic Low Logic High Enable Input Current VIL < 0.2V VIH > 1.0V Turn-on Time COUT = 2.2F; CBYP = 0.01F Light Load Response Response Time (4) Into Light Load Out of Light Load
350
700
0.2 1.0 0.1 0.1 300 50 50 1 1 500
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MIC5311
Electrical Characteristics (LowQTM Mode)
VIN = VOUT + 1.0V for higher output of the regulator pair; LowQTM = 0V; COUT = 2.2F, IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Current Limit
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 / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Response time defined as the minimum hold-off time after the LowQTM command before applying load transients.
Conditions Variation from nominal VOUT VIN = VOUT +1V to 5.5V IOUT = 100A to 10mA IOUT = 10mA Both outputs enabled VEN < 0.2V f = up to 1kHz; COUT = 2.2F ceramic; CBYP = 10nF f = 1kHz - 20kHz; COUT = 2.2F ceramic; CBYP = 10nF VOUT = 0V (Both regulators)
Min -2.0 -3.0
Typ
Max +2.0 +3.0 0.3 0.6 0.5 200 10 12 1.0
Units % % %/V % mV A A A dB dB mA
0.02 0.1 100 7 0.01 45 30 75
40
150
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Typical Characteristics
Ripple Rejection vs. I LOAD (Normal Mode)
90 80 70 PSRR (dB) PSRR (dB) 60 50 40 50mA 150mA
Ripple Rejection LowQ Mode
90 80 70 60 50 40 . 30 VOUT=1.85V VIN=VOUT+1V 20 =10mA I LOAD 10 C = 2.2 F Ceramic 0 10
OUT
Output Voltage vs. Temperature
2.7 OUTPUT VOLTAGE (V) 2.65 2.6 2.55 2.5 2.45 2.4 2.35 2.3 0 100A 25 50 75 100 125
30 VOUT=1.85V +1V V =V 20 IN OUT = 2.2F C 10 OUT C = 10nF 300mA BYP 0 10 1k 100 10k 100k 1M FREQUENCY (Hz)
1k 100 10k 100k 1M FREQUENCY (Hz)
Dropout Characteristics
3
DROPOUT VOLTAGE (mV)
Dropout vs. Temperature (Normal Mode)
160 DROPOUT VOLTAGE (mV) 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 50mA 150mA 300mA
Dropout vs. Temperature (LowQ Mode)
140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 3mA 6mA 10mA
OUTPUT VOLTAGE (V)
2.5 2 1.5 1 0.5 0 0
100mA 150mA 300mA
VOUT=2.6V 1 2 3 4 5 SUPPLY VOLTAGE (V) 6
Ground Current vs. Supply Voltage
35 300mA GROUND CURRENT (A) GROUND CURRENT (A) 30 25 20 15 10 5 0 1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 SUPPLY VOLTAGE (V) 10mA LowQTM 150mA 100mA 30 25 20 15 10 5 35
Ground Current vs. Temperature
50mA 300mA
Ground Current vs. Temperature (LowQ Mode)
9 GROUND CURRENT (A) 8 7 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 120 10mA 100A
150mA
100mA
0 -40 -20 0
20 40 60 80 100 120
Output Noise Spectral Density
1
NOISE (V/rootHz)
0.1
0.01 VIN = 4.45V COUT = 2.2 F CBYP = 0.01F VOUT = 1.8V R 0.001 OUT 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
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Functional Characteristics
Enable On- Normal
VEN (500mV/div)
Enable Off - Normal
VEN (500mV/div)
ILOAD = 200mA VOUT = 2.6V VOUT (1V/div) ILOAD = 200mA VOUT = 2.6V
Time (40s/div)
VOUT (1V/div)
Time (10s/div)
Line Transient - LowQ
VIN (1V/div) VIN (1V/div)
Line Transient - Normal
5.5V
5.5V
4V VOUT (20mV/div)
4V
VOUT (50mV/div)
VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2F LowQ = 0V ILOAD = 10mA Time (200s/div)
ILOAD = 300mA VOUT = 2.6V COUT = 2.2F LowQ = 5.5V Time (40s/div)
Load Transient - LowQ
IOUT (100mA/div) 300mA
Load Transient - Normal
IOUT (10mV/div)
10mA 0mA
100A VOUT (20mV/div)
VOUT (10mV/div)
VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2F Time (200s/div)
VOUT = 2.6V VIN = VOUT + 1V COUT = 2.2F Time (1ms/div)
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MIC5311
Functional Characteristics (cont.)
Normal to LowQ Transien t
LowQTM (1V/div) Normal LowQ
TM
LowQ to Normal Transien t
LowQTM (1V/div) LowQ
TM
Normal
VOUT2 VOUT1 (500mV/div) (500mV/div)
VOUT1 VOUT2 (500mV/div) (500mV/div)
ILOAD = 10mA
ILOAD = 10mA
Time (40s/div)
Time (40s/div)
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MIC5311
Functional Diagram
VIN LDO1 EN1 LOWQ EN2 LowQTM LDO2 VOUT1
VOUT2
BYP
Reference
GND
MIC5311 Block Diagram
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MIC5311
Functional Description
The MIC5311 is a high performance, low quiescent current power management IC consisting of two Cap low dropout regulators with a LowQTM mode featuring lower operating current. Both regulators are capable of sourcing 300mA. Enable 1 and 2 The enable inputs allow for logic control of both output voltages with individual enable inputs. The enable input is active high, requiring 1.0V for guaranteed operation. The enable input is CMOS logic and cannot be left floating. LowQTM Mode The LowQTM pin is logic level low, requiring <0.2V to enter the LowQTM mode. The LowQTM pin cannot be left floating. Features of the LowQTM mode include lower total quiescent current of typically 7uA. Input Capacitor Good bypassing is recommended from input to ground to help improve AC performance. A 1F capacitor or greater located close to the IC is recommended. Larger load currents may require larger capacitor values. Bypass Capacitor The internal reference voltage of the MIC5311 can be bypassed with a capacitor to ground to reduce output noise and increase input ripple rejection (PSRR). A quick-start feature allows for quick turn-on of the output voltage. The recommended nominal bypass capacitor is 0.01F, but an increase will result in longer turn on times ton. Output Capacitor Each regulator output requires a 2.2F ceramic output capacitor for stability. The output capacitor value can be increased to improve transient response, but performance has been optimized for a 2.2F ceramic type output capacitor. 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% to 60% respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than a X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range.
Thermal Considerations The MIC5311 is designed to provide 300mA of continuous current per channel in a very small MLF 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 TJ (max) is the maximum junction temperature of the die, 125C, and TA is the ambient operating temperature. JA is layout dependent; Table 1 shows examples of the junction-to-ambient thermal resistance for the MIC5311. Package 3x3 MLFTM-10 JA Recommended Minimum Footprint 63C/W JC 2C/W
Table 1. MLFTM Thermal Resistance
The actual power dissipation of the regulator circuit can be determined using the equation: PDTOTAL = PD LDO1 + PD LDO2 PD LDO1 = (VIN-VOUT1) x IOUT1 PD LDO2 = (VIN-VOUT2) x IOUT2 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 MIC5311 at 60C with a minimum footprint layout, the maximum load currents can be calculated as follows: PD (max) = (TJ (max) - TA) /JA PD (max) = (125C - 60C) / 63C/W PD (max) = 1.03W The junction-to-ambient thermal resistance for the minimum footprint is 63C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using a lithium-ion battery as the supply voltage of 4.2V, 1.8VOUT/150mA for channel 1 and 2.8VOUT/100mA for channel 2, power dissipation can be calculated as follows: PD LDO1 = (VIN-VOUT1) x IOUT1 PD LDO1 = (4.2V-1.8V) x 150mA PD LDO1 = 360mW PD LDO2 = (VIN-VOUT2) x IOUT2 PD LDO1 = (4.2V-2.8V) x 100mA PD LDO1 = 140mW
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Micrel, Inc. PDTOTAL = PD LDO1 + PD LDO2 PDTOTAL = 360mW + 140mW PDTOTAL = 500mW The calculation shows that we are well below the maximum allowable power dissipation of 1.03W for a 60 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 junction temperature. Calculating maximum ambient temperature as follows:
MIC5311 TA(max) = TJ(max) - (PD x JA) TA(max) = 125C - (500mW x 63C/W) TA(max) = 93.5C For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Micrel's Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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MIC5311
Package Information
10-Pin 3x3 MLF (MLF)
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. (c) 2004 Micrel, Incorporated.
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