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MIC5201
Micrel, Inc.
MIC5201
200mA Low-Dropout Regulator
General Description
The MIC5201 is an efficient linear voltage regulator with very low dropout voltage (typically 17mV at light loads and 200mV at 100mA), and very low ground current (1mA at 100mA output), offering better than 1% initial accuracy with a logic compatible on-off switching input. Designed especially for hand-held battery powered devices, the MIC5201 can be switched by a CMOS or TTL compatible enable signal. This enable control may be connected directly to VIN if unneeded. When disabled, power consumption drops nearly to zero. The ground current of the MIC5201 increases only slightly in dropout, further prolonging battery life. Key MIC5201 features include current limiting, overtemperature shutdown, and protection against reversed battery. The MIC5201 is available in several fixed voltages and accuracy configurations. It features the same pinout as the LT1121 with better performance. Other options are available; contact Micrel for details.
Features
* * * * * * * * * * * * * * * * * * * * High output voltage accuracy Variety of output voltages Guaranteed 200mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reversed-battery protection Load-dump protection (fixed voltage versions) Zero off-mode current Logic-controlled electronic enable Available in SO-8 and SOT-223 packages Cellular telephones Laptop, notebook, and palmtop computers Battery powered equipment PCMCIA VCC and VPP regulation/switching Bar code scanners SMPS post-regulator/ dc-to-dc modules High-efficiency linear power supplies
Applications
Ordering Information
Standard MIC5201BM MIC5201-3.0BM MIC5201-3.3BM MIC5201-5.0BM MIC5201-3.0BS MIC5201-3.3BS MIC5201-4.8BS MIC5201-5.0BS Part Number PbFree MIC5201YM MIC5201-3.0YM MIC5201-3.3YM MIC5201-5.0YM MIC5201-3.0YS MIC5201-3.3YS MIC5201-4.8YS MIC5201-5.0YS Voltage Adj. 3.0V 3.3V 5.0V 3.0V 3.3V 4.8V 5.0V
Junction Temp.* -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 SO-8 SO-8 SO-8 SO-8 SOT-223 SOT-223 SOT-223 SOT-223
Other voltages available. Contact Micrel for details. * Junction Temperature.
Typical Application
ENABLE SHUTDOWN
MIC5201-3.3 IN EN GND 1F OUT VOUT 3.3V
MM8 is a trademark of Micrel, 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
June 2005
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MIC5201
MIC5201
Micrel, Inc.
Pin Configuration
GND
TAB
1
2
3
IN
GND OUT
OUT ADJ GND NC
1 2 3 4
8 7 6 5
IN NC NC EN
MIC5201-x.xBS SOT-223 Fixed
OUT NC GND NC
1 2 3 4
8 7 6 5
IN NC NC EN
MIC5201BM 8-Lead SOIC Adjustable
MIC5201-x.xBM 8-Lead SOIC Fixed
Pin Description
Pin No. SOT-223 3 Pin No. Pin No. SO-8 Adj. SO-8 Fixed 1 2 4, 6, 7 2 3 5 1 8 2, 4, 6, 7 3 5 8 1 Pin Name OUT ADJ NC GND EN VIN Pin Function Regulated Output Feedback Input: (Adjustable version only) not internally connected: Connect to ground plane for lowest thermal resistance. Ground Enable (Input): TTL compatible input. High = enable. Low or open = off/disable. Unregulated Supply Input
Absolute Maximum Ratings
Supply Input Voltage (VIN) Fixed .................. -20V to +60V Supply Input Voltage (VIN) Adjustable .......... -20V to +20V Enable Input Voltage (VEN) Fixed ................. -20V to +60V Enable Input Voltage (VEN) Adjustable ......... -20V to +20V Power Dissipation (PD) ............................ Internally Limited Junction Temperature (TJ) ....................... -40C to +125C Lead Temperature (soldering, 5 sec.) ....................... 260C
Operating Ratings
Supply Input Voltage (VIN) Fixed ................... 2.5V to +26V Supply Input Voltage (VIN) Adjustable ........... 2.5V to +16V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C
MIC5201
2
June 2005
MIC5201
Micrel, Inc.
Electrical Characteristics
VIN = VOUT + 1V; IL = 100A; CL = 3.3F; VEN 2.0V; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol VO VO/T VO/VO VO/VO VO/VO VIN - VO Parameter Output Voltage Accuracy Output Voltage Temperature Coef. Line Regulation, Fixed Line Regulation, Adjustable Load Regulation Dropout Voltage, Note 4 Condition Variation from specified VOUT Note 2 VIN = VOUT + 1V to 26V VIN = VOUT + 1V to 16V IL = 0.1mA to 200mA, Note 3 IL = 100A IL = 20mA IL = 50mA IL = 100mA IL = 200mA VENABLE 0.7V (shutdown) IL = 100A IL = 20mA IL = 50mA IL = 100mA IL = 200mA VIN = 0.5V less than specified VOUT, IL = 100A, Note 5 VOUT = 0V Note 6 Min -1 -2 40 0.004 0.004 0.04 17 130 180 225 270 0.01 130 270 500 1000 3000 75 270 280 0.05 100 330 500 400 2000 Typ Max 1 2 150 0.20 0.40 0.20 0.40 0.16 0.30 Units % % ppm/C % % % % % % mV mV mV mV mV A A A A A A dB A mA %/W V
400
IGND IGND
Quiescent Current Ground Pin Current
PSRR IGNDDO ILIMIT VO/PD en Enable Input VIL VIH IIL IIH VREF IIL
Note 1:
Ripple Rejection Ground Pin Current at Dropout Current Limit Thermal Regulation Output Noise
Input Voltage Level Input Voltage Level Enable Input Current Enable Input Current
logic low (off) logic high (on) VIL 0.7V VIH 2.0V 1.223 1.217 2.0 0.01 15
0.7
V V
1 50
A A
Reference (MIC5201 Adjustable Version Only) Reference Voltage Reference Voltage Temp. Coef. 1.242 20 1.255 1.267 V V ppm/C
General Note: Devices are ESD sensitive. Handling precautions recommended. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(max) = (T T J(max) - A) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The JC of the MIC5201-x.xBS is 15C/W and JA for the MIC5201BM is 160C/W mounted on a PC board (see "Thermal Considerations" section for further details). Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. 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 200mA. 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. 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. Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse at VIN = 26V for fixed and VIN = 16V for adjustable at t = 10ms.
Note 2: Note 3: Note 4: Note 5: Note 6:
June 2005
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MIC5201
MIC5201
Micrel, Inc.
Block Diagrams
VIN IN OUT VOUT COUT
Bandgap Ref.
Current Limit Thermal Shutdown MIC5201-x.xBS GND
Fixed Regulator (SOT-223 version only)
VIN
IN
OUT
VOUT COUT
Bandgap Ref. VREF EN Current Limit Thermal Shutdown MIC5201-x.xBM GND
Fixed Regulator
VIN
IN
OUT
VOUT COUT
ADJ Bandgap Ref. VREF EN Current Limit Thermal Shutdown MIC5201BM [adj.] GND
R1 R2
Adjustable Regulator
MIC5201
4
June 2005
MIC5201
Micrel, Inc.
Typical Characteristics
Dropout Voltage vs. Output Current
250
DROPOUT VOLTAGE (mV)
Dropout Voltage vs. Temperature
0.4 DROPOUT VOLTAGE (V)
Dropout Characteristics
3.5 OUTPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 IL = 100A, 1mA IL = 100mA
200 150 100 50 0 0.01
0.3
IL = 100mA
0.2
0.1
IL = 1mA
0.1 1 10 100 1000 OUTPUT CURRENT (mA)
0.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
2 4 6 8 INPUT VOLTAGE (V)
10
Ground Current vs. Output Current
10 1.6 GROUND CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0
Ground Current vs. Supply Voltage
Output Voltage vs. Output Current
3.5 OUTPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.1 0.2 OUTPUT CURRENT (A) 0.3 CIN = 2.2F COUT = 4.7F
GROUND CURRENT (mA)
IL = 100mA
1
IL = 1mA 2 4 6 8 SUPPLY VOLTAGE (V) 10
0.1 0.01
0.1 1 10 100 OUTPUT CURRENT (mA)
0.30
GROUND CURRENT (mA)
OUTPUT (mV)
Ground Current vs. Temperature
GROUND CURRENT (mA)
ILOAD = 100A CIN = 2.2F COUT = 4.7F
Ground Current vs. Temperature
1.5 1.4 1.3 1.2 1.1 1.0 -50 ILOAD = 100mA CIN = 2.2F COUT = 4.7F
Thermal Regulation (3.3V Version)
100 50 0 -50 200 100 0 0 5 10 15 20 25 30 35 TIME (ms) CL = 4.7 F
0.25
0.20
0.15 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
0 50 100 TEMPERATURE (C)
150
LOAD (mA)
-100 -5
3.6
OUTPUT VOLTAGE (V)
Output Voltage vs. Temp. (3.3V Version)
OUTPUT CURRENT (mA)
Output Current vs. Temperature
300 280 260 240 220 200 180
Minimum Input Voltage vs. Temperature
MIN. INPUT VOLTAGE (V)
3.5 3.4 3.3 3.2 3.1
CIN = 2.2F COUT = 4.7F
3.30 3.29 3.28 3.27 3.26 3.25 3.24 3.23 3.22 3.21 3.20 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) CIN = 2.2F COUT = 4.7F ILOAD = 1mA
VOUT = 3.3V
3 DEV IC ES : HI / AVG / LO CURVES APPLICABLE AT 100A AND 100mA
3.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
VOUT = 0V 160 (SHORT CIRCUIT) 140 120 100 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
June 2005
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MIC5201
MIC5201
Micrel, Inc.
SHORT CIRCUIT CURRENT (mA)
OUTPUT (mA) OUTPUT (mV)
300 250 200 150 100 50 0 1 CIN = 2.2F COUT = 4.7F VOUT = 3.3V 2 3 4 5 6 INPUT VOLTAGE (V) 7
OUTPUT (mA) OUTPUT (mV)
Short Circuit Current vs. Input Voltage
Load Transient
20 10 0 -10 -20 300 -30 200 100 0 -2 0 2 4 6 TIME (ms) 8 10 CL = 4.7F
Load Transient
20 10 0 -10 -20 -30 300 200 100 0 -10 0 10 20 TIME (ms) 30 40 CL = 47F
OUTPUT (mV)
120
SUPPLY CURRENT (mA)
100 80 60 40 20 0 0 1 2 3 4 5 6 7 8 9 10 SUPPLY VOLTAGE (V) RL = 33
5 0 -5
CL = 1 F IL = 1mA
OUTPUT (mV)
Supply Current vs. Supply Voltage (3.3V Version)
Line Transient
10
Line Transient
15 10 5 0 -5 8 6 4 2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 TIME (ms) CL = 10 F IL = 1mA
8 -10 6 4 2 -0.2 0 0.2 0.4 TIME (ms) 0.6 0.8
INPUT (V)
INPUT (V)
Supply Current vs. Supply Voltage (3.3V Version)
60 SUPPLY CURRENT (mA) 50 40 30 ENABLE (V) 20 10 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 7 RL = 66 OUTPUT (V) 5 4 3 2 1 0 -1 4 2 0 -2 -50
Enable Transient (3.3V Version)
OUTPUT (V)
Enable Transient (3.3V Version)
5 4 3 2 1 0 -1 4 2 0 -2 -50 0 50 100 150 200 250 300 TIME (s)
CL = 4.7 F IL = 1mA
CL = 4.7 F IL = 100mA
0
50 100 150 200 250 300 TIME (s)
ENABLE (V)
Output Impedance
1000
35 ENABLE CURRENT (A)
Enable Current Threshold vs. Temperature
ENABLE VOLTAGE (V)
30 25 20 15 10 5 0 VE N = 2V VE N = 5V CIN = 2.2F COUT = 4.7F
Enable Voltage Threshold vs. Temperature
1.6 1.4 1.2 1 0.8 0.6 0.4 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) OFF CIN = 2.2F COUT = 4.7F
OUTPUT IMPEDANCE ()
100 10 1 0.1
IL = 100A
IL = 1mA
ON
0.01
IL = 100mA
1x100
1x103
100x100
FREQUENCY (Hz)
MIC5201
100x103
10x100
10x103
1x106
0.001
-5 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
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June 2005
MIC5201
Micrel, Inc.
Ripple vs. Frequency
100
RIPPLE VOLTAGE (dB)
Ripple vs. Frequency
100 80 IL = 1mA 60 40 20 0
RIPPLE VOLTAGE (dB)
Ripple vs. Frequency
100 80 IL = 100mA 60 40 20 0
RIPPLE VOLTAGE (dB)
80 60 40 20 0
IL = 100A
1x103
1x106
1x103
100x100
100x103
100x100
100x100
100x103
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
June 2005
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100x103
10x100
10x103
10x100
10x100
10x103
10x103
1x103
1x106
1x106
MIC5201
MIC5201
Micrel, Inc.
VIN MIC5201BM IN EN OUT ADJ GND R1 3.3F R2
VOUT
Applications Information
Figure 1 shows a basic fixed-voltage application with the unused enable input connected to VIN.
VIN MIC5201-x.xBM MIC5201-x.xBS IN EN GND 1F OUT
VOUT
CADJ
Figure 3. Decreasing Ouput Noise Minimum Load The MIC5201 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Dual-Supply Systems 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. Thermal Considerations Layout The MIC5201-x.xBM (8-pin surface mount package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. PC Board Dielectric FR4 Ceramic JA 160C/W 120C/W
Figure 1. Fixed Application Adjustable regulators require two resistors to set the output voltage. See Figure 2.
VIN MIC5201BM IN EN OUT ADJ GND R1 3.3F R2 VOUT
R2 VOUT = 1.242V 1 + R1
Figure 2. Adjustable Application Resistors values are not critical because ADJ (adjust) has a high impedance, but for best results use resistors of 470k or less.
Output Capacitors
A 1F capacitor is recommended between the MIC5201 output and ground to prevent oscillations due to instability. Larger values serve to improve the regulator's transient response. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. The important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47F for current below 10mA or 0.33F for currents below 1mA. Input Capacitors A 1F capacitor should be placed from the MIC5201 input to ground if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. Noise Reduction Capacitors On adjustable devices, a capacitor from ADJ to GND will decrease high-frequency noise on the output. See Figure 3.
Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The "worst case" value of 160C/W assumes no ground plane, minimum trace widths, and a FR4 material board. Nominal Power Dissipation and Die Temperature The MIC5201-x.xBM at a 25C ambient temperature will operate reliably at up to 625mW power dissipation when mounted in the "worst case" manner described above. At an ambient temperature of 55C, the device may safely dissipate 440mW. These power levels are equivalent to a die temperature of 125C, the recommended maximum temperature for non-military grade silicon integrated circuits. For MIC5201-x.xBS (SOT-223 package) heat sink characteristics, please refer to Micrel Application Hint 17, P.C. Board Heat Sinking.
50 mil
245 mil
150 mil
30 mil
50 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size MIC5201 8 June 2005
MIC5201
Micrel, Inc.
Package Information
0.026 (0.65) MAX) PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.050 (1.27) TYP
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
8-Pin SOP (M)
3.15 (0.124) 2.90 (0.114)
C L
C L
3.71 (0.146) 7.49 (0.295) 3.30 (0.130) 6.71 (0.264)
2.41 (0.095) 2.21 (0.087) 4.7 (0.185) 4.5 (0.177) 6.70 (0.264) 6.30 (0.248)
1.04 (0.041) 0.85 (0.033) DIMENSIONS: MM (INCH) 1.70 (0.067) 16 1.52 (0.060) 10 10 MAX
0.10 (0.004) 0.02 (0.0008)
0.038 (0.015) 0.25 (0.010)
0.84 (0.033) 0.64 (0.025) 0.91 (0.036) MIN
SOT-223 (S)
MICREL INC.
TEL
2180 FORTUNE DRIVE
FAX
SAN JOSE, CA 95131 USA
WEB
+ 1 (408) 944-0800
+ 1 (408) 474-1000
http://www.micrel.com
This 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) 1998 Micrel Incorporated
June 2005
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MIC5201

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