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MIC5247
Micrel, Inc.
MIC5247
150mA Low-Voltage Cap Linear Regulator
General Description
The MIC5247 is an efficient and precise, low-voltage CMOS voltage regulator optimized for ultra-low noise applications. The MIC5247 offers better than 1% initial accuracy and 85A constant ground current over load (typically 85A). The MIC5247 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 handheld and battery-powered devices, the MIC5247 provides a logic compatible enable pin. When disabled, power consumption drops nearly to zero. The MIC5247 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld 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 6-pin 2mm x 2mm MLFTM package and the IttyBitty(R) SOT-23-5 package, the MIC5247 also offers a range of fixed output voltages. All support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * * * * * * * * * * * Ultra-low noise Low-voltage outputs Load independent, ultra-low ground current: 85A 150mA output current Current limiting Thermal shutdown Tight load and line regulation "Zero" off-mode current Stability with low-ESR capacitors Fast transient response 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
Typical Application
VIN MIC5247-x.xBM5
1 2
Enable Shutdown
5
VOUT COUT
ENABLE SHUTDOWN
VIN EN
MIC5247-x.xBML
1 2 3 6 5 4
VOUT CBYP COUT
3
4
(optional)
EN
EN (pin 3) may be connected directly to IN (pin 1).
CBYP (optional)
Ultra-Low-Noise Regulator Application
Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
February 2006
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MIC5247
Micrel, Inc.
Ordering Information
Part Number Standard MIC5247-1.5BM5 MIC5247-1.6BM5 MIC5247-1.8BM5 MIC5247-1.85BM5 MIC5247-2.0BM5 MIC5247-2.1BM5 MIC5247-2.2BM5 MIC5247-2.4BM5 MIC5247-1.8BD5 MIC5247-2.0BD5 MIC5247-1.5BML MIC5247-1.6BML MIC5247-1.8BML MIC5247-1.85BML Marking LU15 LU16 LU18 LU1J LU20 LU21 LU22 LU24 NU18 NU20 U15 U16 U18 U1J Pb-Free MIC5247-1.5YM5 MIC5247-1.6YM5 MIC5247-1.8YM5 MIC5247-1.85YM5 MIC5247-2.0YM5 MIC5247-2.1YM5 MIC5247-2.2YM5 MIC5247-2.4YM5 MIC5247-1.8YD5 MIC5247-2.0YD5 MIC5247-1.5YML MIC5247-1.6YML MIC5247-1.8YML MIC5247-1.85YML Marking** LU15 LU16 LU18 LU1J LU20 LU21 LU22 LU24 NU18 NU20 U15 U16 U18 U1J Voltage* 1.5V 1.6V 1.8V 1.85V 2.0V 2.1V 2.2V 2.4V 1.8V 2.0V 1.5V 1.6V 1.8V 1.85V 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 -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 Thin SOT-23-5 Thin SOT-23-5 6-Pin 2mm x 2mm MLFTM 6-Pin 2mm x 2mm MLFTM 6-Pin 2mm x 2mm MLFTM 6-Pin 2mm x 2mm MLFTM
* Other voltage options available, please contact Micrel Marketing for details. ** Over and under bar ( ) (__) symbols may not be to scale.
Pin Configuration
EN GND IN
3
2
1
EN 1 GND 2
6 BYP 5 NC 4 OUT
LUxx/ NUxx
4 5
IN 3
BYP
OUT
MIC5247-x.xBM5 / YM5 MIC5247-x.xBD5 / YM5 (Top View)
MIC5247-x.xBML / YML 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
Pin Description
Pin Number SOT-23-5 1 2 3 4 5 -- -- Pin Number MLFTM-6 3 2 1 6 4 5 EP Pin Name IN GND EN BYP OUT NC GND 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 0.01pF capacitor to GND to reduce output noise. May be left open. Regulator output. No internal connection. Ground. Internally connected to the exposed pad. Connect to ground pin.
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Micrel, Inc.
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) ....................................0V to +7V Enable Input Voltage (VEN) ...................................0V to VIN Junction Temperature (TJ) ....................................... +150C Storage Temperature (TS) ........................ -65C to +150C Lead Temperature (soldering, 5 sec.) ........................ 260C ESD Rating(3)
Operating Ratings(2)
Input Voltage (VIN) .......................................... +2.7V to +6V Enable Input Voltage (VEN) ...................................0V to VIN Junction Temperature (TJ) ........................ -40C to +125C Package Thermal Resistance SOT-23-5 (JA) .................................................. 235C/W 2mm x 2mm MLFTM (JA) .................................... 90C/W
Electrical Characteristics(4)
VIN = VOUT + 1.0V; VIN = VEN; IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C; unless noted. Symbol Parameter Conditions Min -1 -2 -0.3 2 3 150 0.2 85 85 50 160 300 30 1 150 150 VO VLNR VLDR VIN - VOUT IQ IGND PSRR ILIM en Output Voltage Accuracy Line Regulation Load Regulation Load Regulation for 1.5V and 1.6V Dropout Voltage Quiescent Current Ground Pin Current(7) Power Supply Rejection Current Limit Output Voltage Noise IOUT = 0mA VIN = 2.7V to 6V Typ Max 1 2 +0.3 3 4 Units % % %/V % % mV A A A dB mA Vrms
IOUT = 0.1mA to 150mA(5) IOUT = 150mA(6) IOUT = 0mA
IOUT = 0.1mA to 150mA, VOUT = 1.5V or 1.6V
VEN 0.4V (shutdown) IOUT = 150mA f 1kHz VOUT = 0V
COUT = 10F, CBYP = 0.01F, f = 10Hz to 100kHz VIN = 2.7V to 5.5V, regulator shutdown
Enable Input VIL Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current Shutdown Resistance Discharge Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis
Notes: 1. Exceeding the absolute maximum ratings may damage the device. 2. The device is not guaranteed to function outside its operating ratings. 3. Devices are ESD sensitive. Handling precautions recommended. 4. Specification for packaged product only. 5. 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. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured a1V 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. 7. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
0.8 1.6 1 0.01 0.01 500 150 10
0.4
V V A A C C
VIH IEN
VIN = 2.7V to 5.5V, regulator enabled VIH 1.6V VIL 0.4V
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Micrel, Inc.
Typical Characteristics
Power Supply Rejection Ratio
CBYP = 0.01F
PSRR (dB)
90 70
PSRR (dB)
80 CBYP = 1F 60 C 50 40 30 20 10
1x101 1x102
70 60
Power Supply Rejection Ratio
1F
60 50
PSRR (dB)
Power Supply Rejection Ratio
0.01F 1F
BYP
=0
50 0.01F 40 CBYP = 0 IL = 50mA 20 VIN = 3.4V 10 VOUT = 2.4V COUT =10F Ceramic 0 30
1x101 1x103 1x104 1x102
40 30 CBYP = 0
1x104
1x104
1x106
1x103
1x105
1x105
1x106
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
60 50
Power Supply Rejection Ratio
0.01 F 1F CBYP = 0
OUTPUT SPECTRAL NOISE DENSITY ( V/rt Hz)
1x10
-5
Noise Performance
CBYP = 0
75
GROUND CURRENT (A)
Ground Current vs. Output Current
74 73 72 71 70 VIN = VOUT + 1
1x100 1x101 1x103 1x10
2
PSRR (dB)
40 30
1x10-6 CBYP = 0.01 F VIN = 2.8V VOUT = 1.8V COUT = 4.7 F
FREQUENCY (Hz)
1x10
20 IL = 150mA VIN = 3.4V 10 VOUT = 2.4V COUT = 10 F Ceramic 0 10 100 1k 10k 100k 1M
1x10-7
-1
1x10
-8
ILOAD = 50mA
10
1k 10k 100k 1M 100 FREQUENCY (Hz)
OUTPUT CURRENT (mA)
100
Ground Pin Current
GROUND CURRENT (A)
100 80 60 40 20
Ground Pin Current
GROUND CURRENT (A)
100 80 60 40 20 0 0
Ground Pin Current
GROUND CURRENT (A)
80 60 40 20 0 -40 -10 20 50 80 110 140 TEMPERATURE C) ( ILOAD = 100A
0 -40 -10 20 50 80 110 140 TEMPERATURE C) (
ILOAD = 150mA
ILOAD = 100A 2 3 1 INPUT VOLTAGE (V) 4
VOLTAGE OUT (V)
80 60 40 20 0 0 ILOAD = 150mA 1 2 3 INPUT VOLTAGE (V) 4
ILOAD = 100A ILOAD = 150mA
2
1
SHORT CIRCUIT CURRENT (mA)
100
Ground Pin Current
3
Dropout Characteristics
500 400 300 200 100
Short Circuit Current vs. Temperature
GROUND CURRENT (A)
0 0
1 2 3 INPUT VOLTAGE (V)
4
VOUT = 0 0 -40 -10 20 50 80 110 140 TEMPERATURE C) (
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1x106
1x102
1x103
1x105
1x10
0
IL = 100A VIN = 3.4V VOUT = 2.4V COUT = 10F Ceramic
20 IL = 100mA VIN = 3.4V 10 V OUT = 2.4V COUT = 10F Ceramic 0
1
MIC5247
Micrel, Inc.
Typical Characteristics, cont.
2.5 OUTPUT VOLTAGE (V)
Output Voltage vs. Temperature
200 150
TIME (s)
Turn-On Time vs. Bypass Capacitance
COUT = 10F ILOAD = 100mA
2.4
100 50
Rise Time
1x10-5
1x10-4
1x10-3
1x10-2
(F) BYPASS CAPACITOR
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5
1x10-1
1x100
1x101
2.3 -40 -10 20 50 80 110 140 TEMPERATURE C) (
ILOAD = 100A
Prop Delay
0
M9999-022406
MIC5247
Micrel, Inc.
Functional Characteristics
Load Transient Response
Line Transient Response
4.4V COUT = 10F CBYP = 0 VIN = 3.4V VOUT = 2.4V 100mA 100A 3.4V
COUT = 10F VOUT = 2.4V ILOAD = 100A
TIME (100s/div.)
TIME (500s/div.)
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Micrel, Inc.
Block Diagram
IN
Reference Voltage
EN
Thermal Sensor
Startup/ Shutdown Control
Quickstart/ Noise Cancellation
BYP
PU L L UP
FAUL T
Undervoltage Lockout
Error Amplifier
Current Amplifier
PU L L DOWN
OUT
AC TIVE SH U TD OWN
GND
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MIC5247
Micrel, Inc. resistance of the device and the following basic equation:
T (max) - T A PD (max) = J JA
Applications Information
Enable/Shutdown The MIC5247 comes with an active-high enable pin that can disable the regulator. 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. 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 MIC5247 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 MIC5247 has been designed to work specifically with 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. 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 without bound, further reducing noise and improving PSRR. Turn-on time remains constant with respect to bypass capacitance. Refer to the "Typical Characteristics" section for a graph of turn-on time vs. bypass capacitor. Transient Response The MIC5247 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 (85A). Active Shutdown The MIC5247 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 MIC5247 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
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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 MIC5247.
Package SOT-23-5 (M5) JA Recommended Minimum Footprint 235C/W JA 1" Square Copper Clad 185C/W JC 145C/W
Table 1. SOT-23-5 Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation:
PD = VIN - VOUT x IOUT + VIN x 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 MIC5247-2.4BM5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows:
125C - 25 C PD (max) = 235C /W PD (max) = 425mW
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 2.4V and an output current of 150mA, the maximum input voltage can be determined. 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. 425mW = (VIN - 2.4V) 150mA 785mW = VINx150mA VIN(max) = 5.2V 425mW = VIN x150mA - 360mW
Therefore, a 2.4V application at 150mA of output current can accept a maximum input voltage of 5.2V in a SOT-23-5 package. 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. Fixed Regulator Applications
VIN MIC5247-x.xBM5
1 2 3 4 5
VOU T 1F
0.01F
Figure 1. Ultra-Low-Noise Fixed Voltage Application 8 February 2006
MIC5247 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.
VIN MIC5247-x.xBM5 VOU T
1 2 Enable Shutdown 3 4 5
Micrel, Inc.
1.0F
EN
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.
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MIC5247
Micrel, Inc.
Package Information
SOT-23-5 (M)
TSOT-23-5 (D5)
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MIC5247
Micrel, Inc.
6-Pin MLFTM (ML)
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 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.
MICREL, INC. 1849 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
February 2006
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M9999-022406

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