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MIC5308
Low VIN/VOUT 150mA High PSRR ULDOTM with Ultra-Low IQ
General Description
The MIC5308 is a high performance, Cap low dropout regulator, offering ultra-low operating current while maintaining very fast transient response. The MIC5308 can source up to 150mA of output current and can regulate down from a low input supply voltage to increase system efficiency. Ideal for battery operated applications; the MIC5308 offers extremely low dropout voltage 45mV typically @ 150mA, and low ground current at all load conditions (typically 23A). The MIC5308 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. The MIC5308 is available in fixed output voltages in the tiny 6-pin 1.6mm x 1.6mm thin MLF(R) leadless package as well as the 6-pin TSOT-23 for cost sensitive applications. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * * * * * * * * Input voltage range: 1.6V to 5.5V Guaranteed 150mA over temperature Ultra Low dropout voltage of 45mV at 150mA High PSRR, up to 90dB @ 1kHz Output Voltage range: 0.8V to 2.0V Very low ground current - 23A under full load Bias supply voltage range: 2.5V to 5.5V Stable with 1F ceramic output capacitor 150mA maximum output current at 1.6V input voltage Very fast transient response - ideal for digital loads Thermal shutdown and current limit protection Tiny 6-pin 1.6mm x 1.6mm Thin MLF(R) package Cost effective 6-pin TSOT-23 package
Applications
* * * * Mobile Phones PDAs GPS Receivers Portable Electronics
___________________________________________________________________________________________________________
Typical Application
MIC5308
BIAS VIN VOUT
1.2V / 150mA
Li-Ion 2.7V to 4.2V
MIC23050 DC-to-DC Converter
CBIAS 1F
CIN 1F
EN GND BYP
CBYP 10nF
COUT 1F
ULDO is a trademark of Micrel, Inc. 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
May 2008
M9999-051508-D
Micrel, Inc.
MIC5308
Ordering Information
Part Number MIC5308-1.2YMT MIC5308-1.5YMT MIC5308-1.8YMT MIC5308YMT MIC5308-1.2YD6 MIC5308-1.5YD6 MIC5308-1.8YD6 MIC5308YD6
Notes For other voltage options. Contact Micrel Marketing for details. Pin 1 identifier = . MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
(R)
Voltage 1.2V 1.5V 1.8V Adj. 1.2V 1.5V 1.8V Adj.
Marking Codes

Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin 1.6mm x 1.6mm Thin MLF(R) 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23
1R2 1R5 1R8
ARA
QR12 QR15 QR18 QRAA
Pin Configuration
BIAS 3 BIAS 1 GND 2 VIN 3 6 5 4 BYP/ADJ EN VOUT 4 5 6 VOUT BYP/ADJ EN GND 2 VIN 1
6-Pin 1.6mm x 1.6mm Thin MLF(R) (MT)
6-Pin TSOT-23 (D6)
Pin Description
Pin Number Thin MLF-6
3 2 1 6 5 4 HS Pad
Pin Number TSOT-23-6
1 2 3 4
Pin Name
VIN GND BIAS BYP ADJ
Pin Function
Power Input for LDO. Ground Bias Input Voltage. Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection. Adjustable: Feedback input from external resistor divider. Enable Input: Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. Output of regulator. Exposed heatsink pad connected to ground internally.
5 6 -
EN VOUT EPAD
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MIC5308
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................ 0V to VBIAS Bias Supply Voltage (VBIAS).................................. 0V to +6V Enable Voltage (VEN)........................................... 0V to VBIAS Power Dissipation, ................................ Internally Limited(3) Lead Temperature (soldering, 10sec.)..................... 260C Storage Temperature (Ts) .........................-65C to +150C ESD Rating(4) .................................................................. 3kV
Operating Ratings(2)
Supply Voltage (VIN)........................................+1.6V to VBIAS Bias Supply Voltage (VBIAS).......................... +2.5V to +5.5V Enable Input Voltage (VEN)...................................0V to VBIAS Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance 1.6x1.6 MLF-6 (JA) ...........................................90C/W TSOT-23-6 (JA)...............................................235C/W
Electrical Characteristics
VBIAS = 3.6V; VIN = VOUT + 1V; VIN VBIAS; COUT = 1.0F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter
Output Voltage Accuracy Reference Voltage VBIAS Line Regulation VIN Line Regulation Load Regulation Dropout Voltage Ground Pin Current
(5)
Condition
Variation from nominal VOUT ADJ pin voltage VBIAS = 3.6 to 5.5V, VIN = VOUT + 1V
Min
-2.0
Typ
0.775 0.01 0.02 0.2 45 23 0.01 70
Max +2.0 0.7905 0.3 0.2 1 150 35
2.0
Units
% V %/V %/V % mV A A dB dB dB mA VRMS
0.7595
VIN = VOUT + 1V, VBIAS = 5.5V
IOUT = 100A to 150mA IOUT = 150mA IOUT = 100A to 150mA VEN 0.2V f = up to 1kHz; COUT = 1.0F; no CBYP f = up to 1kHz;COUT = 1.0F; CBYP = 10nF f = 20kHz; COUT = 1.0F; CBYP = 10nF 50
Ground Pin Current in Shutdown VIN Ripple Rejection
90 80
Current Limit Output Voltage Noise
f = up to 1kHz;COUT = 1.0F; CBYP = 10nF f = 20kHz; COUT = 1.0F; CBYP = 10nF Logic Low Logic High
180
325 28
Enable Inputs (EN)
Enable Input Voltage Enable Input Current Turn-on Time
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. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 5. IGND = IIN + IBIAS - IOUT.
0.2 1.2
0.17 1.5 150
V V A A s
VIL 0.2V VIH 1.2V COUT = 1.0F; CBYP = 10nF
1 1 500
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MIC5308
Typical Characteristics
-120 -100 -80 -60 50mA 150mA 100A (no byp)
Power Supply Rejection Ratio (V IN)
100A 100mA
-100 -90 -80 -70 -60
Power Supply Rejection Ratio (VBIAS)
100A
10 9 8 7 6 5
Ground Current (V IN) vs. Temperature
150mA 100A VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F 20 40 60 80 TEMPERATURE (C)
-40 V = V IN OUT + 1V VOUT = 1.2V -20 COUT = 1F CBYP = 0.01F 0 10 100 1K 10K 100K FREQUENCY (Hz)
-50 150mA -40 -30
50mA
1M
-20 VIN = 2.8V V = 1.8V -10 OUT COUT = 1F 0 10 100 1K 10K 100K FREQUENCY (Hz)
4 3 2 1 0
1M
10 9 8 7 6 5 4 3 2 1 0 0
Ground Current (V IN) vs. Output Current
16 14 12 10 8
Ground Current (V BIAS) vs. Output Current
30 28 26 24 22 20
Ground Current (Total) vs. Output Current
VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
6 4 2 0 0 VIN = 2.2V VBIAS = 3.6V COUT = 1F CBYP = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
18 16 14 12 10 0
VIN = 2.2V VBIAS = 3.6V COUT = 1F CBYP = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
10 9 8 7 6 5 4 3 2 1
Ground Current (V IN) vs. V IN
150mA 100A
40 35 30 25 20 15
Bias Current vs. Enable Voltage
100A
80 70 60 50
Dropout Voltage vs. Temperature
150mA
150mA
40 30
VBIAS = 5.5V VOUT = 1.8V COUT = 1F
0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V)
VBIAS = 5.5V VOUT = 1.8V COUT = 1F
10 5 0 0
20 10 0 COUT = 1F 20 40 60 80 TEMPERATURE (C)
1 2 3 4 5 ENABLE VOLTAGE (V)
50 45 40 35 30 25 20 15 10 5 0 0
Dropout Voltage vs. Output Current
1.30
Output Voltage vs. Temperature
1.30
Output Voltage vs. Output Current
1.25
1.25
1.20 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F IOUT = 100A 20 40 60 80 TEMPERATURE (C)
1.20 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F 25 50 75 100 125 OUTPUT CURRENT (mA)
1.15 COUT = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
1.15
1.10
1.10
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MIC5308
Typical Characteristics (continued)
2.0 1.8 1.6 1.4 100A 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 VBIAS = 5.5V VOUT = 1.2V COUT = 1F 3 VIN (V) 4 5 150mA
Output Voltage vs. V IN
0.900 0.875 0.850 0.825 0.800 0.775 0.750 0.725 0.700
Reference Voltage vs. Temperature
VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F IOUT = 100A
400 350 300 250 200 150
Current Limit vs. VIN
20 40 60 80 TEMPERATURE (C)
100 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V)
VOUT = 1.8V VBIAS = 3.6V
10
Output Noise Spectral Density
1
0.1
0.01 C OUT = 1F CBYP = 0.01F ILOAD 0.001 10 100 1K 10K 100K FREQUENCY (Hz)
1M
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MIC5308
Functional Characteristics
May 2008
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M9999-051508-D
Micrel, Inc.
MIC5308
Functional Diagram
MIC5308 Block Diagram
May 2008
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MIC5308 Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.01F 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. A unique, quick-start circuit allows the MIC5308 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Minimum Load Current The MIC5308, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Adjustable Regulator Design The MIC5308 adjustable version allows programming the output voltage anywhere between 0.8Vand 2V. Two resistors are used. The resistor values are calculated by:
V R1 = R2 x OUT - 1 0.775 Where VOUT is the desired output voltage.
Applications Information
The MIC5308 is a high performance, low-dropout linear regulator designed for low current applications requiring fast transient response. The MIC5308 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC-to-DC conversion. The MIC5308 requires a minimum of external components. The MIC5308 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC5308. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. 1F ceramic capacitor from VBIAS to ground helps reduce high frequency noise from being injected into the control circuitry from the bias rail and is good design practice. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1.6V, allowing conversion from low voltage supplies. Output Capacitor The MIC5308 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1F ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype 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. Input Capacitor The MIC5308 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the input to ground to provide stability. 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 filter out high-frequency noise and are good practice in any RF-based circuit. May 2008 8
Enable/Shutdown The MIC5308 comes with a single active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a "zero" off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Thermal Considerations The MIC5308 is designed to provide 150mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 3.3V, the output voltage is 1.2V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN - VOUT1) I OUT + VIN IGND Because this device is CMOS and the ground current is typically <100A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.3V - 1.2V) x 150mA PD = 0.315W
M9999-051508-D
Micrel, Inc. To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
TJ(max) - TA PD(max) = JA
MIC5308
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 90C/W.
May 2008
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M9999-051508-D
Micrel, Inc.
MIC5308
Package Information
6-Pin 1.6mm x 1.6mm Thin MLF(R) (MT)
6-Pin TSOT-23 (D6)
May 2008
10
M9999-051508-D
Micrel, Inc.
MIC5308
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) 2007 Micrel, Incorporated.
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