MIC35302 Datasheet PDF - MICREL

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MIC35302
MICREL

Part Number MIC35302
Description 3A / Low Voltage uCap LDO Regulator
Page 8 Pages


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MIC35302
3A, Low Voltage µCap LDO Regulator
General Description
The MIC35302 is a 3A low-dropout linear voltage regulator
that provides a low voltage, high current output with a
minimum of external components. It offers high precision,
ultra-low dropout (600mV over temperature), and low
ground current.
The MIC35302 operates from an input of 2.25V to 6.0V. It
is designed to drive digital circuits requiring low voltage at
high currents (i.e., PLDs, DSPs, micro-controllers, etc.),
providing an adjustable output voltage from 1.24V to 5.4V.
Features of the MIC35302 LDO include current limiting
and thermal protection, and reverse current and reverse
battery protection. Also logic (active-HIGH) enable pin is
included. The MIC35302 is available in a 5-pin power
D-Pak package (TO-252) with an operating temperature
range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
3A minimum guaranteed output current
600mV maximum dropout voltage over temperature
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V, 1.65V, or 1.5V conversion
Stable with ceramic or tantalum capacitor
Wide input voltage range
– VIN: 2.25V to 6.0V
±1.0% initial output tolerance
Excellent line and load regulation specications
Logic controlled shutdown
Thermal shutdown and current limit protection
Reverse-leakage protection
–40°C to +125°C junction temperature
Power D-Pak package (TO-252)
Applications
LDO linear regulator for low-voltage digital IC
PC add-in cards
High efficiency linear power supplies
SMPS post regulator
Battery charger
_________________________________________________________________________________________________________________________
Typical Application**
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Adjustable Regulator Application
(*See Minimum Load Current Section)
Super βeta PNP is a registered trademark of Micrel, Inc.
**See Thermal Design Section
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 2009
M9999-102309-A



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Micrel, Inc.
Ordering Information
Part Number
MIC35302WD*
Output Current
3A
Voltage
Adjustable
Note:
* RoHS compliant with ‘high-melting solder’ exemption.
Junction Temp. Range(1)
–40° to +125°C
MIC35302
Package
5-Pin TO-252
Pin Configuration
5-Pin TO-252 D-Pak (D)
Pin Description
Pin Number
Pin Name
Pin Function
1 EN Enable (Input): CMOS compatible input.
Logic high = enable, logic low = shutdown.
2 IN Input Voltage: Supplies the current to the output power device
3 GND, TAB Ground: TAB is also connected internally to the IC’s ground on D-PAK.
4
OUT
Regulator Output: The output voltage is set by the resistor divider
connected from OUT to GND (with the divided connection tied to ADJ).
A minimum value capacitor must be used to maintain stability. See
Functional Description Information.
5 ADJ Adjustable Regulator Feedback Input: Connect to the resistor voltage
divider that is placed from OUT to GND in order to set the output
voltage.
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October 2009
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Micrel, Inc.
MIC35302
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ..................................... –0.3V to +6.5V
Enable Input Voltage (VEN)........................... –0.3V to +6.5V
Power Dissipation .....................................Internally Limited
Junction Temperature .........................–40°C TJ +125°C
Storage Temperature (Ts) ...................–65°C TJ +150°C
Lead Temperature (soldering, 5sec.)......................... 260°C
ESD Rating(3).................................................................. 2kV
Operating Ratings(2)
Supply voltage (VIN) ................................... +2.25V to +6.0V
Enable Input Voltage (VEN)................................ 0V to +6.0V
Junction Temperature Range .............–40°C TJ +125°C
Maximum Power Dissipation..................................... Note 4
Package Thermal Resistance
TO-252 (θJC) ........................................................3°C/W
TO-252 (θJA) ......................................................56°C/W
Electrical Characteristics(5)
TJ = 25°C with VIN = VEN = VOUT + 1V; IOUT = 10mA; bold values indicate –40°C < TJ < +125°C, unless otherwise noted.
Parameter
Condition
Min Typ Max Units
Output Voltage Line Regulation
Output Voltage Load Regulation
Dropout Voltage, VIN – VOUT
VIN = VOUT +1.0V to 6.0V
IOUT = 10mA to 3A
IOUT = 1.5A
0.02 0.5
0.2 1
250 450
%
%
mV
Note 6
IOUT = 3A
370 600
mV
Ground Pin Current, Note 7
Ground Pin Current in Shutdown
Current Limit
Start-up Time
Enable Input
Enable Input Threshold
Enable Pin Input Current
Adjust Pin
Reference Voltage
IOUT = 3A
VIL 0.5V, VIN = VOUT + 1V
VOUT = 0
VEN = VIN, IOUT = 10mA, COUT = 47µF
Regulator enable
Regulator shutdown
VIL 0.8V (regulator shutdown)
VIH 2.25V (regulator enabled)
Reference Voltage Temp. Coefficient Note 8
Adjust Pin Bias Current
Adjust Pin Bias Current Temp.
Coefficient
20 50
1.0
3.5 6 8.5
35 150
mA
µA
A
µs
2.25
0.8
4
1 15 75
V
V
µA
µA
1.228
1.215
1.240
20
40
0.1
1.252
1.265
80
120
V
V
ppm/°C
nA
nA
nA/°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. 200V Machine Model
4. PD(MAX) = (TJ(MAX) – TA) / θJA, where θJA, depends upon the printed circuit layout. See “Applications Information.”
5. Specification for packaged product only.
ww6. w.DsVpDaeOtca=iSVchaIeNtei–otn4VUdOUo.cTeowsmhneont
VOUT
apply
decreased to 98%
due to a minimum
of its
input
nominal output voltage with
operating voltage of 2.25V.
VIN
=
VOUT
+1V.
For
output
voltages
below
1.75V,
dropout
voltage
7. IGND is the quiescent current. IIN = IGND + IOUT.
8. Thermal regulation is dened as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line
regulation effects. Specications are for a 200mA load pulse at VIN = 6V for t = 10ms.
October 2009
3 M9999-102309-A



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Micrel, Inc.
Typical Characteristics
Power Supply
Rejection Ratio
80
70
VIN = 2.5V
VOUT = 1.5V
60
50
40
30
20 IOUT = 3A
10
COUT = 47µF
CIN = 0
00.01 0.1 1
10 100
FREQUENCY (kHz)
1000
Power Supply
Rejection Ratio
80
70
VIN = 2.5V
VOUT = 1.5V
60
50
40
30
20 IOUT = 3A
10
COUT = 100µF
CIN = 0
00.01 0.1 1 10 100
FREQUENCY (kHz)
1000
MIC35302
www.DataSheet4U.com
October 2009
4
M9999-102309-A



MIC35302 datasheet pdf
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