View MIC5245-30BM5_5034153.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MIC5245
Micrel
MIC5245
150mA Cap CMOS LDO Regulator Final Information
General Description
The MIC5245 is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. The MIC5245 offers better than 1% initial accuracy, extremely low dropout voltage (typically 150mV at 150mA) and constant ground current over load (typically 100A). The MIC5245 provides a very low noise output, ideal for RF applications where quiet voltage sources are required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for hand-held and battery-powered devices, the MIC5245 provides a TTL logic compatible enable pin. When disabled, power consumption drops nearly to zero. The MIC5245 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. Key features include current limit, thermal shutdown, a pushpull output for faster transient response, and an active clamp to speed up device turnoff. Available in the IttyBittyTM SOT-23-5 and power MSO-8 packages, the MIC5245 also offers a range of fixed output voltages.
Features
* * * * * * * * * * * * * * * * * * * Ultralow dropout--100mV @ 100mA Ultralow noise--30V(rms) Stability with tantalum or ceramic capacitors Load independent, ultralow ground current 150mA output current Current limiting Thermal Shutdown Tight load and line regulation "Zero" off-mode current Fast transient response TTL-Logic-controlled enable input Cellular phones and pagers Cellular accessories Battery-powered equipment Laptop, notebook, and palmtop computers PCMCIA VCC and VPP regulation/switching Consumer/personal electronics SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies
Applications
Not recommended for new designs, see MIC5255.
Ordering Information
Part Number MIC5245-2.5BM5 MIC5245-2.7BM5 MIC5245-2.8BM5 MIC5245-2.85BM5 MIC5245-3.0BM5 MIC5245-3.1BM5 MIC5245-3.2BM5 MIC5245-3.3BM5 MIC5245-3.3BMM Marking LS25 LS27 LS28 LS2J LS30 LS31 LS32 LS33 -- Voltage 2.5V 2.7V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.3V Junction Temp. Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 MSOP-8
Other voltages available. Contact Micrel for details.
Typical Application
VIN MIC5245-x.xBM5
1 2 Enable Shutdown 3 4 5
VOUT COUT
ENABLE SHUTDOWN
MIC5245-3.3MM
1 2 3 4 8 7 6 5
VIN VOUT
EN
EN (pin 3) may be connected directly o IN (pin 1).
CBYP (optional)
COUT
CBYP (OPTIONAL)
Ultra-Low-Noise Regulator Application
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
August 2002
1
MIC5245
MIC5245
Micrel
Pin Configuration
EN GND IN
3 2 1
EN 1 IN 2 OUT 3
8 GND 7 GND 6 GND 5 GND
LSxx
4 5
BYP
OUT
BYP 4
MIC5245-x.xBM5
8-Pin MSOP (BMM)
Pin Description
Pin Number Power MOS-8 2 5-8 1 4 3 Pin Number SOT-23 1 2 3 4 5 Pin Name IN GND EN BYP OUT Pin Function Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. Reference Bypass: Connect external 0.01F capacitor to GND to reduce output noise. May be left open. Regulator Output
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (VIN) .................................. 0V to +7V Enable Input Voltage (VEN) ................................. 0V to +7V Junction Temperature (TJ) ...................................... +150C Storage Temperature ............................... -65C to +150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD, Note 3
Operating Ratings (Note 2)
Input Voltage (VIN) ......................................... +2.7V to +6V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C Thermal Resistance SOT-23 (JA) .....................................................235C/W MSOP-8 (JA) ......................................................80C/W
MIC5245
2
August 2002
MIC5245
Micrel
Electrical Characteristics (Note 7)
VIN = VOUT + 1V, VEN = VIN; IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C; unless noted. Symbol VO VLNR VLDR VIN - VOUT Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage, Note 5 Conditions IOUT = 0mA VIN = VOUT + 0.1V to 6V IOUT = 0.1mA to 150mA, Note 4 IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA IQ IGND PSRR ILIM en Enable Input VIL VIH IEN Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current VIN = 2.7V to 5.5V, regulator shutdown VIN = 2.7V to 5.5V, regulator enabled VIL 0.4V VIH 2.0V Shutdown Resistance Discharge Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
Note 1. Note 2. Note 3. Note 4. Note 5. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating voltage is 2.7V. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Specification for packaged product only.
Min -1 -2 -0.3
Typical
Max 1 2
Units % % %/V % mV mV mV mV mV A A A dB mA V(rms)
0 2.0 1.5 50 100 150 0.2 100 100 50
0.3 3.0 5 85 150 200 250 1 150
Quiescent Current Ground Pin Current, Note 6
VEN 0.4V (shutdown) IOUT = 0mA IOUT = 150mA f = 120Hz, COUT = 10F, CBYP = 0.01F VOUT = 0V COUT = 10F, CBYP = 0.01F, f = 10Hz to 100kHz 160
Power Supply Rejection Current Limit Output Voltage Noise
300 30
0.8 2.0 1 0.17 1.5 500
0.4
V V A A C C
150 10
Note 6. Note 7.
August 2002
3
MIC5245
MIC5245
Micrel
Typical Characteristics
Power Supply Rejection Ratio
100 IOUT = 100A 80 COUT = 1F tant PSRR (dB) 60 40 20 0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) VIN = 4V VOUT = 3V PSRR (dB) 100 IOUT = 10mA 80 COUT = 1F tant 60 40 20 0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) VIN = 4V VOUT = 3V
Power Supply Rejection Ratio
100
Power Supply Rejection Ratio
IOUT = 100mA 80 COUT = 1F tant PSRR (dB) 60 40 20 0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) VIN = 4V VOUT = 3V
Power Supply Rejection Ratio
100 IOUT = 150mA 80 COUT = 1F tant PSRR (dB) 60 40 20 0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) VIN = 4V VOUT = 3V PSRR (dB) 100 80
Power Supply Rejection Ratio
100 80 PSRR (dB) 60 40 20
Power Supply Rejection Ratio
VIN = 4V VOUT = 3V
60 40 20 V = 4V IN VOUT = 3V 0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) IOUT = 100A COUT = 10F cer. CBYP = 0.01F
IOUT = 10mA COUT = 10F cer. CBYP = 0.01F
0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
Power Supply Rejection Ratio
100 80 PSRR (dB) 60 40 20 IOUT = 100mA COUT = 10F cer. CBYP = 0.01F VIN = 4V VOUT = 3V PSRR (dB)
100 80 60 40 20
Power Supply Rejection Ratio
RIPPLE REJECTION (dB)
VIN = 4V VOUT = 3V
Power Supply Ripple Rejection vs. Voltage Drop
80 70 60 50 40 30 20 10 0 0 150mA IOUT = 100mA COUT = 1F 200 400 600 800 1000 VOLTAGE DROP (mV) 100A 10mA
IOUT = 150mA COUT = 10F cer. CBYP = 0.01
0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 10M 10 100 1k 10k 100k 1M 1E+7 FREQUENCY (Hz)
Power Supply Ripple Rejection vs. Voltage Drop
80 RIPPLE REJECTION (dB) 70 60 50 40 30 20 10 0 0 100A COUT = 10F cer. CBYP = 0.01F 200 400 600 800 1000 VOLTAGE DROP (mV) 10mA 100mA IOUT = 100mA
Noise Performance
10 IL = 100A NOISE (V/Hz) 1 NOISE (V/Hz) 1 10
Noise Performance
IL = 100A
VIN = 4V 0.1 V OUT = 3V COUT = 1F cer. CBYP = 0.01F 0.01 10 100 1k 10k 1E+5 1M 1E+1 1E+2 1E+3 1E+4 100k 1E+6 FREQUENCY (Hz)
VIN = 4V 0.1 VOUT = 3V COUT = 10F cer. CBYP = 0.01F 0.01 1k 10k 100k 1M 10 100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 FREQUENCY (Hz)
MIC5245
4
August 2002
MIC5245
Micrel
Ground Pin Current
95 QUIESCENT CURRENT (A) VIN = 4V VOUT = 3V QUIESCENT CURRENT (A) 200
Ground Pin Current
VIN = 4V VOUT = 3V
150
90
100
50 IOUT = 100A 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
85 0.1
1 10 100 LOAD CURRENT (mA)
500
Ground Pin Current
150 QUIESCENT CURRENT (A) VIN = 4V VOUT = 3V QUIESCENT CURRENT (A) 100
Ground Pin Current
100 VOUT = 3V 75 QUIESCENT CURRENT (A)
Ground Pin Current
VOUT = 3V 75
125
100
50
50
75 IOUT = 150mA 50 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
25 IOUT = 100A 0 0 1 2 3 4 INPUT VOLTAGE (V) 5
25
IOUT = 150mA 1 2 3 4 INPUT VOLTAGE (V) 5
0 0
Dropout Characteristics
3.5 DROPOUT VOLTAGE (mV) OUTPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 3 4 INPUT VOLTAGE (V) 5 VOUT = 3V RL = 30k RL = 30 8
Dropout Voltage
300 ILOAD = 100A 6 DROPOUT VOLTAGE (mV) 250 200 150 100 50
Dropout Voltage
IL = 150mA
4
2
0 -40 -20 0 20 40 60 80 100120140 TEMPERATURE (C)
0 -40 -20 0 20 40 60 80 100120140 TEMPERATURE (C)
Dropout Voltage
300 DROPOUT VOLTAGE (mV) 250 200 150 100 50 0 0 TA = -40C 25 50 75 100 125 150 OUTPUT CURRENT (mA) TA = 125C TA = 25C OUTPUT CURRENT (mA) 600 500 400 300 200 100
Short Circuit Current
3.05 OUTPUT VOLTAGE (V)
Output Voltage vs. Temperature
VIN = 4V
TYPICAL 3V DEVICE
3.00
VIN = 3.5V VEN = 3V
2.95
2.90 ILOAD = 100A 2.85 -50 0 50 100 TEMPERATURE (C) 150
0 -40 -20 0 20 40 60 80 100120140 TEMPERATURE (C)
August 2002
5
MIC5245
MIC5245
Micrel
Enable Pin Bias Current
2.0 ENABLE PIN CURRENT (A) THRESHOLD VOLTAGE (V)
4
Enable Threshold Voltage
1.5 VIN = 4.0V 1.0
3
2
VIN = 4.0V
0.5
VEN = 100mV
1
0 -40 -20 0 20 40 60 80 100120140 TEMPERATURE (C)
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
Functional Characteristics
Line Transient Response
OUTPUT VOLTAGE (50mV/div.)
OUTPUT VOLTAGE (100mV/div.)
Load Transient Response
6V VOUT = 3V COUT = 10F CBYP = 0.01F IOUT = 100A 4V
OUTPUT CURRENT
INPUT VOLTAGE (2V/div.)
150mA VIN = 4V VOUT = 3V COUT = 10F cer. CBYP = 0.01F
100A
TIME (10ms/div.)
TIME (100s/div.)
Enable Pin Delay
ENABLE VOLTAGE (1V/div.) ENABLE VOLTAGE (2V/div.)
Shutdown Delay
OUTPUT VOLTAGE (1V/div.)
VIN = 4V VOUT = 3V COUT = 10F CBYP = 0.01F IOUT = no load TIME (20s/div.)
OUTPUT VOLTAGE (1V/div.)
VOUT = 3V COUT = 10F CBYP = 0.01F IOUT = no load
TIME (1ms/div.)
MIC5245
6
August 2002
MIC5245
Micrel
Block Diagrams
IN Reference Voltage Startup/ Shutdown Control Quickstart/ Noise Cancellation BYP
PULL UP
EN
Thermal Sensor Undervoltage Lockout
FAULT
Error Amplifier
Current Amplifier
PULL DOWN
OUT
ACTIVE SHUTDOWN
GND
August 2002
7
MIC5245
MIC5245
Micrel
Active Shutdown The MIC5245 also features an active shutdown clamp, which is an N-channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load. Thermal Considerations The MIC5245 is designed to provide 150mA of continuous current 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: TJ(max) - TA PD(max) = 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 junction-toambient thermal resistance for the MIC5245.
Package SOT-23-5 (M5) JA Recommended JA 1" Square Minimum Footprint Copper Clad 235C/W 185C/W JC 145C/W
Applications Information
Enable/Shutdown The MIC5245 comes with an 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-modecurrent state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. This part is CMOS and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor An input capacitor is not required for stability. A 1F input capacitor is recommended when the bulk ac supply capacitance is more than 10 inches away from the device, or when the supply is a battery. Output Capacitor The MIC5245 requires an output capacitor for stability. The design requires 1F or greater on the output to maintain stability. The capacitor can be a low-ESR ceramic chip capacitor. The MIC5245 has been designed to work specifically with the low-cost, small chip capacitors. Tantalum capacitors can also be used for improved capacitance over temperature. The value of the capacitor can be increased without bound. X7R dielectric 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 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 or a tantalum capacitor to ensure the same minimum capacitance value over the operating temperature range. Tantalum capacitors have a very stable dielectric (10% over their operating temperature range) and can also be used with this device. 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. Transient Response The MIC5245 implements a unique output stage to dramatically improve transient response recovery time. The output is a totem-pole configuration with a P-channel MOSFET pass device and an N-channel MOSFET clamp. The N-channel clamp is a significantly smaller device that prevents the output voltage from overshooting when a heavy load is removed. This feature helps to speed up the transient response by significantly decreasing transient response recovery time during the transition from heavy load (100mA) to light load (100A).
Table 1. SOT-23-5 Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN IGND 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 MIC5245-3.3BM5 at 50C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: 125C - 50C PD(max) = 235C/W PD(max) = 315mW The junction-to-ambient thermal resistance for the minimum footprint is 235C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically 87A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. 315mW = (VIN - 3.3V) 150mA 315mW = VIN x 150mA - 495mW 810mW = VIN x 150mA VIN(max) = 5.4V Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 5.4V in a SOT-23-5 package. For a full discussion of heat sinking and thermal
MIC5245
8
August 2002
MIC5245
effects on voltage regulators, refer to the Regulator Thermals section of Micrel's Designing with Low-Dropout Voltage Regulators handbook. Fixed Regulator Applications
VIN MIC5245-x.xBM5
1 2 3 4 5
Micrel
VIN MIC5245-x.xBM5 V OUT
1 2 Enable Shutdown 3 4 5
1.0F
EN
VOUT 1F 0.01F
Figure 2. Low-Noise Fixed Voltage Application Figure 2 is an example of a low-noise configuration where CBYP is not required. COUT = 1F minimum. Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.
Figure 1. Ultra-Low-Noise Fixed Voltage Application Figure 1 includes a 0.01F capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/shutdown is not required. COUT = 1F minimum.
August 2002
9
MIC5245
MIC5245
Micrel
Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 1.50 (0.059)
3.00 (0.118) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
0.60 (0.024) 0.10 (0.004)
SOT-23-5 (M)
MIC5245
10
August 2002
MIC5245
Micrel
August 2002
11
MIC5245
MIC5245
Micrel
MICREL, INC. 1849 FORTUNE DRIVE
TEL
SAN JOSE, CA 95131
WEB
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel, Inc. (c) 2002 Micrel, Incorporated
MIC5245
12
August 2002

▲Up To Search▲

Price & Availability of MIC5245-30BM5

	To Download MIC5245-30BM5 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .