mic47300 Micrel Semiconductor, mic47300 Datasheet

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mic47300

Manufacturer Part Number
mic47300
Description
3a, Low Voltage, Adjustable Ldo Regulator With Dual Input Supply
Manufacturer
Micrel Semiconductor
Datasheet
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
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.
__________________________________________________________________________________________
Typical Application*
October 2009
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
configuration
allowing
for
very
Figure 1. Typical Application Circuit
low
output
Features
• Input Voltage Range:
• Stable with 1µF ceramic capacitor
• ±1% initial tolerance
• Maximum dropout voltage (V
• 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
over temperature
3A, Low Voltage, Adjustable LDO
Regulator with Dual Input Supply
V
V
IN
BIAS
: 1.4V to 6.5V
: 3.0V to 6.5V
MIC47300
IN
–V
*See Thermal Design Section
OUT
) of 400mV
M9999-102309-A

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mic47300 Summary of contents

Page 1

... 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’ ...

Page 2

... 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. 2 Package –40° to +125°C 5-Pin TO-252 MIC47300 M9999-102309-A ...

Page 3

... TO-252 (θ ) ........................................................3°C/W JC TO-252 (θ ).......................................................56°C/W JA ≤ +125°C, unless noted. J Min Typ –0.1 0.01 0.2 105 230 1. 6.5 168 10 0.891 0.9 0.882 0.01 input. BIAS MIC47300 ≤ +125°C J Max Units %/V +0.1 % 0.5 mV 200 mV 400 V 2 150 A 10 °C °C 0.909 V V 0.918 μ ...

Page 4

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

Page 5

... Micrel, Inc. Typical Characteristics (continued) October 2009 5 MIC47300 M9999-102309-A ...

Page 6

... Micrel, Inc. Functional Characteristics October 2009 6 MIC47300 M9999-102309-A ...

Page 7

... V provides the high current to the collector of the pass IN transistor. The minimum input voltage is 1.4V, allowing conversion from low voltage supplies. Output Capacitor The MIC47300 is designed to be stable with a minimal capacitance value and without However, proper capacitor selection is important to ensure desired transient response. A 1µF ceramic chip capacitor should satisfy most applications and output capacitance can be increased without bound ...

Page 8

... D-Pak adhering to the JA following criteria for the PCB design: 2 oz. copper and 2 100mm copper area for the MIC47300. Given a maximum ambient temperature (T the use of a heat sink, the maximum power allowed that October 2009 would temperature (125°C) is ...

Page 9

... Micrel, Inc. Application Information Adjustable Regulator Design The MIC47300 allows programming the output down to 0.9V. From the typical application in Figure 1, the output voltage is set by placing a resistor divider network from OUT to GND and is determined by the following equation: ⎛ ⎞ × + ⎜ ⎟ V 0.9 1 OUT R2 ⎝ ...

Page 10

... October 2009 Manufacturer (1) Kemet 10µF, 10V, X7R Ceramic Capacitor Kemet 1µF, 10V, X7R Ceramic Capacitor Kemet 1µF, 10V, X7R Ceramic Capacitor (2) Vishay 180Ω Resistor, Film, 0805 (3) Murata 5kΩ Potentiometer (4) Micrel, Inc. MIC47300 LDO Regulator 10 MIC47300 Description M9999-102309-A Qty ...

Page 11

... 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 October 2009 5-Pin TO-252 Power D-Pak (D) indemnify Micrel for any damages resulting from such use or sale. © 2009 Micrel, Incorporated. 11 MIC47300 M9999-102309-A ...

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