Document
MIC29302A
3A Fast-Response LDO Regulator
General Description
The MIC29302A is a high-current, low-cost, low-dropout voltage regulator that uses Micrel's proprietary Super βeta PNP® process with a PNP pass element. The 3A LDO regulator features 450mV (full load) dropout voltage and very low ground current. Designed for high-current loads, these devices also find applications in lower current, lowdropout critical systems, where their dropout voltages and ground current values are important attributes.
Along with a total accuracy of ±2% (over temperature, line, and load regulation) the regulator features very fast transient recovery from input voltage surges and output load current changes.
The MIC29302A has an adjustable output that can be set by two external resistors to a voltage between 1.24V and 15V. In addition, the device is fully protected against overcurrent faults, reversed input polarity, reversed lead insertion, and overtemperature operation. A TTL logic enable (EN) pin is available in the MIC29302A to shutdown the regulator. When not used, the device can be set to continuous operation by connecting EN to the input (IN). The MIC29302A is available in the standard and 5-pin
TO-263 and TO-252 packages with an operating junction temperature range of −40°C to +125°C.
Datasheets and support documentation can be found on Micrel’s website at: www.micrel.com.
Features
• High-current capability − 3A over full temperature range
• Low-dropout voltage of 450mV at full load • Low ground current • Accurate 1% guaranteed tolerance • Extremely fast transient response • Zero-current shutdown mode • Error flag signals output out-of-regulation • Adjustable output voltage • Packages: TO-263-5L and TO-252-5L
Applications
• Processor peripheral and I/O supplies • High-efficiency “green” computer systems • Automotive electronics • High-efficiency linear lower supplies • Battery-powered equipment • PC add-in cards • High-efficiency post-regulator for switching supply
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Typical Application
VOUT
= 1.242 × R1 + 1 R2
DROPOUT VOLTAGE (mV)
Dropout Voltage vs. Output Current
500
400 VIN = 3.3V VADJ = 0V
300
TA = 25ºC
200
100
0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
Super ßeta PNP is a registered 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
October 3, 2014
Revision 2.0
Micrel, Inc.
Ordering Information
Part Number MIC29302AWU MIC29302AWD
Voltage Adjustable Adjustable
Pin Configuration
Junction Temperature Range –40°C to +125°C –40°C to +125°C
MIC29302A
Package 5-Pin TO-263 5-Pin TO-252
5-Pin TO-263 (D2Pak) Adjustable Voltage (U) MIC29302AWU
5-Pin TO-252 (D-Pak) Adjustable Voltage (D) MIC29302AWD
Pin Description
Pin Number TO-263 1 2 3, TAB 4 5
Pin Number TO-252 1 2 3, TAB 4 5
Pin Name Pin Function
EN IN GND OUT ADJ
Enable (Input): Active-high CMOS compatible control input. Do not float. INPUT: Unregulated input, +3V to +16V maximum GND: TAB is also connected internally to the IC’s ground on both packages. OUTPUT: The regulator output voltage Feedback Voltage: 1.24V feedback from external resistor divider.
October 3, 2014
2
Revision 2.0
Micrel, Inc.
MIC29302A
Absolute Maximum Ratings(1)
Input Supply Voltage (VIN)(1) ........................... –20V to +20V Enable Input Voltage (VEN)................................ –0.3V to VIN Lead Temperature (soldering, 5 sec.) ........................ 260°C Power Dissipation .....................................Internally Limited Storage Temperature Range ....................–65°C to +150°C ESD Rating all pins(3)
Operating Ratings(2)
Operating Junction Temperature .............. −40°C to +125°C Operating Input Voltage ....................................... 3V to 16V Package Thermal Resistance
TO-263 (θJC).........................................................3°C/W TO-252 (θJC).........................................................3°C/W TO-252 (θJA) ......................................................35°C/W TO-263 (θJA).......................................................28°C/W
Electrical Characteristics(4)
VIN = 4.2V; IOUT = 100mA; TA = 25°C, bold values indicate −40°C≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
Output Voltage Output Voltage Accuracy(5)
100mA ≤ IOUT ≤3A, (VOUT + 1V) ≤ VIN ≤ 16V
−2
2%
Line Regulation
IOUT = 100mA, (VOUT + 1V) ≤ VIN ≤ 16V
0.1 0.5
%
Load Regulation
VIN = VOUT + 1V, 100mA ≤ IOUT ≤ 3A
0.2 1
%
IOUT = 100mA
80 200
IOUT = 750mA
220
Dropout Voltage(6) Ground Current
IOUT = 1.5A IOUT = 2.0A IOUT = 2.5A IOUT = 3A
275 mV
375 630 430 720 450 800
IOUT = 750mA, VIN = VOUT + 1V
5 20
Ground Current
IOUT = 1.5A
15 mA
IOUT = 3A
60 150
IGRNDDO Ground Pin Current @ Dropout
Current Limit
VIN = 0.5V less than specified VOUT × IOUT .