MIC47300 Datasheet PDF - MICREL

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MIC47300
MICREL

Part Number MIC47300
Description 3A / Low Voltage Adjustable LDO Regulator
Page 11 Pages


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MIC47300
3A, Low Voltage, Adjustable LDO
Regulator with Dual Input Supply
General Description
The MIC47300 is a high-bandwidth, low-dropout, 3A volt-
age regulator ideal for powering core voltages of low-
power microprocessors. The MIC47300 implements a dual
supply conguration allowing for very low output
impedance and very fast transient response.
The MIC47300 requires a bias input supply between 3V
and 6.5V for proper operation. The main input supply rail
operates from 1.4V to 6.5V that allows for adjustable
output voltages down to 0.9V.
The MIC47300 requires a minimum of 1µF output
capacitance for stability, and optimal operation is achieved
with small ceramic capacitors.
The MIC47300 is available in a 5-pin power D-Pak
package (TO-252) with an operating temperature range of
–40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Input Voltage Range:
– VIN: 1.4V to 6.5V
– VBIAS: 3.0V to 6.5V
Stable with 1µF ceramic capacitor
±1% initial tolerance
Maximum dropout voltage (VIN–VOUT) of 400mV
over temperature
Adjustable output voltage down to 0.9V
Ultra fast transient response (Up to 10MHz bandwidth)
Excellent line and load regulation specifications
Power D-Pak package (TO-252)
Thermal shutdown and current-limit protection
Junction temperature range: –40°C to 125°C
Applications
Graphics processors
PC add-in cards
Microprocessor core voltage supply
Low voltage digital ICs
High efficiency linear power supplies
SMPS post regulators
__________________________________________________________________________________________
Typical Application*
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Figure 1. Typical Application Circuit
*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
MIC47300WD*
Output Current
3A
Voltage
Adjustable
Note:
* RoHs compliant with ‘high-melting solder’ exemption.
Junction Temp. Range
–40° to +125°C
MIC47300
Package
5-Pin TO-252
Pin Configuration
5-Pin TO-252 D-Pak (D)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
ADJ
BIAS
GND, TAB
IN
OUT
Pin Name
Adjustable Regulator Feedback Input: Connect to the resistor voltage divider that is
placed from OUT to GND in order to set the output voltage.
Input Bias Voltage: Voltage for powering all internal circuitry of the regulator with the
exception of the output power device.
Ground: TAB is also connected internally to the IC’s ground on D-Pak.
Input Voltage: Supplies the current to the output power device
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 Applications Information.
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Micrel, Inc.
MIC47300
Absolute Maximum Ratings(1)
Supply Voltage (VIN) .........................................................8V
Bias Supply Voltage (VBIAS)..............................................8V
Power Dissipation .....................................Internally Limited
ESD Rating(3).................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)......................................... 1.4V to 6.5V
Bias Supply Voltage (VBIAS)................................. 3V to 6.5V
Junction Temperature (TJ) ..................–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)
VIN = VOUT + 1V, VBIAS = VOUT + 2.1V, IOUT = 10mA; TA = 25°C, bold values indicate –40°CTJ +125°C, unless noted.
Symbol Parameter
Condition
Min Typ Max Units
VLNREG Line Regulation
VIN = VOUT +1V to 6.5V
–0.1 0.01 +0.1
%/V
VLDREG Load Regulation
IOUT = 10mA to A
0.2 0.5
%
VDO Dropout Voltage (VIN -VOUT)
IOUT = 1.5A
IOUT = 3A
105 200
230 400
mV
mV
VDO(BIAS) Dropout Voltage (VBIAS - VOUT)
Note 6
IOUT = 3A
1.24 2.1
V
IGND Ground Pin Current, Note 7
IOUT = 10mA
IOUT = 3A
25 mA
25 50 mA
IBIAS
Current thru VBIAS
IOUT = 10mA
IOUT = 3A
20 35 mA
50 150 mA
ILIM Current Limit
VOUT = 0V
6.5 10
A
TSD Thermal Shutdown
Thermal Shutdown Hysteresis
168 °C
10 °C
Reference (Adjust Pin)
VADJ
Reference Voltage
IADJ Adjust Pin Current
VADJ = 1.2V
0.891
0.882
0.9
0.01
0.909
0.918
1
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. Human body model, 1.5kin series with 100pF.
4. PD(MAX) = (TJ(MAX) – TA) / θJA, where θJA, depends upon the printed circuit layout. See “Applications Information.”
5. Specification for packaged product only.
6. For VOUT 1V, VBIAS dropout specication does not apply due to a minimum 3V VBIAS input.
7. IGND = IBIAS + (IIN – IOUT). At high loads, input current on VIN will be less than the output current, due to drive current being supplied by VBIAS.
V
V
μA
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October 2009
3 M9999-102309-A



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Micrel, Inc.
Typical Characteristics
MIC47300
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October 2009
4 M9999-102309-A



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