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Part: MIC29310
Category:
Power Management
-> Regulators
-> Linear Regulators
-> LDO (Low Drop Out)
Description: MIC29310/29312 3A Fast-response LDO Regulator
Company: Micrel Semiconductor
Datasheet: Download MIC29310 datasheet File size : 232 kB
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Datasheet text preview:
MIC29310/29312
Micrel
MIC29310/29312
3A Fast-Response LDO Regulator Final Information
General Description
The MIC29310 and MIC29312 are low cost versions of MIC29300 family low-dropout (LDO) regulators. Manufactured on Micrel's proprietary Super beta PNPTM process, the MIC29310/2 is a 3A LDO regulator with very low-dropout voltage (600mV over the full load) and low ground current. Along with a total accuracy of ±2% (over temperature, line and load regulation) these regulators feature very fast transient recovery from input voltage surges and output load current changes. The MIC29310 is available in fixed 3.3V and 5V outputs voltages; the MIC29312 has an adjustable output which can be set by two external resistors to a voltage between 1.24V to 15V. In addition, all versions are fully protected against overcurrent faults, reversed input polarity, reversed lead insertion, and overtemperature operation. A TTL logic enable (EN) pin is available in the MIC29312 to shutdown the regulator. When not used, the device can be set to continuous operation by connecting EN to the input (IN). The MIC29310/2 is available in the standard 3- and 5-pin TO-220 and TO-263 packages with an operating junction temperature range of 0°C to +125°C.
Features
· · · · · · · · · · · · · · Low cost versions of MIC29300 family Fast transient response 3A current over full temperature range 600mV dropout voltage at full load Low ground current Accurate 1% guaranteed tolerance "Zero" current shutdown mode (MIC29312) Fixed voltage and adjustable versions Processor peripheral and I/O supplies PC add-in cards High-efficiency "green" computer systems High-efficiency linear power supplies High-efficiency switching supply post regulator Battery-powered equipment
Applications
For applications requiring even lower dropout voltage, input voltage greater than 16V, or an error flag, see the MIC29300/29301/29302/ 29303.
Ordering Information
Part Number MIC29310-3.3BT MIC29310-3.3BU MIC29310-5.0BT MIC29310-5.0BU MIC29312BT MIC29312BU Voltage 3.3V 3.3V 5.0V 5.0V Adj. Adj. Junction Temp. Range 0°C to +125°C 0°C to +125°C 0°C to +125°C 0°C to +125°C 0°C to +125°C 0°C to +125°C Package TO-220-3 TO-263-3 TO-220-3 TO-263-3 TO-220-5 TO-263-5
Typical Application
MIC29312
On Off
EN IN GND
OUT R1* ADJ R2*
VOUT
VIN
MIC29310-x.x IN OUT GND
VOUT
VIN
V OUT = 1. 240
R1 +1 R2
* For best performance, total series resistance (R1 + R2) should be small enough to pass the minimum regulator load current of 10mA.
Fixed Regulator Configuration
Adjustable Regulator Configuration
Micrel, Inc. · 1849 Fortune Drive · San Jose, CA 95131 · USA · tel + 1 (408) 944-0800 · fax + 1 (408) 944-0970 · http://www.micrel.com
July 1999
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MIC29310/29312
MIC29310/29312
Micrel
Pin Configuration
3
TAB
OUT
TAB
3 2 1
OUT GND IN
2 1
GND IN
MIC29310-x.xBT TO-220-3 (T)
MIC29310-x.xBU TO-263-3 (U)
5 4 3 2 1
ADJ OUT GND IN EN
5 4 3 2 1
ADJ OUT GND IN EN
TAB
TAB
MIC29312-x.xBT TO-220-5 (T)
MIC29312-x.xBU TO-263-5 (U)
Pin Description
Pin Number MIC29310 Pin Number MIC29312 1 1 2, TAB 3 2 3, TAB 4 5 Pin Name EN IN GND OUT ADJ Pin Function Enable (Input): Active-high, logic-level enable/shutdown control. Unregulated Input: +16V maximum supply. Ground: Ground pin and TAB are internally connected. Regulator Output Ouput Voltage Adjust: 1.24V feedback from external resistive divider.
Absolute Maximum Ratings (Note 1)
Input Voltage (VIN) ....... 20V to +20V Power Dissipation (PD) .... Internally Limited Storage Temperature Range (TS) ... 65°C to +150°C Lead Temperature (soldering, 5 sec.) ..... 260°C ESD, Note 3
Operating Ratings (Note 2)
Input Voltage (VIN) ...... +2.3V to +16V Junction Temperature (TJ) ... 0°C to +125°C Package Thermal Resistance TO-263 (JC) ......... 2°C/W TO-220 (JC) ......... 2°C/W TO-220 (JA) ....... 55°C/W
MIC29310/29312
2
July 1999
MIC29310/29312
Micrel
Electrical Characteristics(Note 11)
TJ = 25°C, bold values indicate 0°C TJ +125°C; unless noted Parameter Output Voltage Line Regulation Load Regulation VO / T Dropout Voltage Condition 10mA IO IFL, (VOUT + 1V) VIN 8V, Note 4 IO = 10mA, (VOUT + 1V) VIN 16V VIN = VOUT + 1V, 10mA IOUT IFULL LOAD, Notes 4, 8 Output Voltage Temperature Coefficient, Note 8 VOUT = 1%, Note 5 IO = 100mA IO = 750mA IO = 1.5A IO = 3A IO = 750mA, VIN = VOUT + 1V IO = 1.5A IO = 3A VIN = 0.5V less than specified VOUT. IOUT = 10mA VOUT = 0V, Note 6 CL = 10µF CL = 33µF 10mA IO IFL, VOUT + 1V VIN 8V, Note 4 1.215 40 Note 9 20 0.1 3.0 Min 2 0.06 0.2 20 80 220 330 600 5 15 60 2 3.8 7 400 260 10 Typ Max 2 0.5 1 100 200 Units % % % ppm/°C mV mV mV mV mA mA mA mA A mA µVRMS µVRMS 1.265 80 120 VMAX nA nA ppm/°C nA/°C
1000 20 150 3
Ground Current
IGNDDO Ground Pin Current at Dropout Current Limit Minimum Load Current en, Output Noise Voltage (10Hz to 100kHz) IL = 100mA Reference (MIC29312 only) Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient Enable Input (MIC29312 only) Input Logic Voltage Enable Pin Input Current
low (off) high (on) VEN = VIN VEN = 0.8V
0.8 2.4 15 10 20 30 75 2 4
V V µA µA µA µA µA µA
Regulator Output Current in Shutdown
Note 1. Note 2. Note 3. Note 4: Note 5: Note 6: Note 7: Note 8: Note 9:
Note 10
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. Full Load current is defined as 3A for the MIC29310/29312. For testing, VOUT is programmed to 5V. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. For this test, VIN is the larger of 8V or VOUT + 3V. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. VREF VOUT (VIN 1V), 2.4V VIN 16V, 10mA < IL IFL, TJ TJ(max).
Note 10: VEN 0.8V and VIN 8V, VOUT = 0. Note 11: Specification for packaged product only.
July 1999
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MIC29310/29312
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