MIC5236 Micrel Semiconductor, MIC5236 Datasheet

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MIC5236

Manufacturer Part Number
MIC5236
Description
Low Quiescent Current Cap LDO Regulator Preliminary Information
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The MIC5236 is a low quiescent current, Cap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 20 A, it is ideal for supplying keep-
alive power in systems with high-voltage batteries.
Capable of 150mA output, the MIC5236 has a dropout
voltage of only 300mV. It can also survive an input transient
of –20V to +60V.
As a Cap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0 F output
capacitor for stability.
The MIC5236 includes a logic compatible enable input and an
undervoltage error flag indicator. Other features of the
MIC5236 include thermal shutdown, current-limit, overvolt-
age shutdown, load-dump protection, reverse leakage pro-
tections, and reverse battery protection.
Available in the thermally enhanced SOP-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjust-
able voltages. For other output voltages, contact Micrel.
Typical Application
November 2000
MIC5236
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
30V
V
IN
Regulator with Low I
IN
EN
MIC5236
GND
OUT
ERR
O
and Low I
V
5V
IN
V
3.0V/100 A
I
GND
OUT
Regulator with Adjustable Output
= 20 A
Q
IN
EN
MIC5236
GND
OUT
ADJ
1
Features
• Ultra-low quiescent current (I
• Wide input range: 2.3V to 30V
• Low dropout:
• Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs
• Stable with ceramic or tantalum output capacitor
• Load dump protection: –20V to +60V input transient
• Logic compatible enable input
• Low output flag indicator
• Overcurrent protection
• Thermal shutdown
• Reverse-leakage protection
• Reverse-battery protection
• High-power SOP-8 and MSOP-8
Applications
• Keep-alive supply in notebook and
• Logic supply from high-voltage batteries
• Automotive electronics
• Battery-powered systems
Low Quiescent Current Cap LDO Regulator
survivability
portable personal computers
1.0% initial output accuracy
V
5V
230mV @50mA;
300mV @150mA
IN
V
3.0V/150mA
OUT
Preliminary Information
Regulator with Error Output
IN
EN
MIC5236
GND
MIC5236
OUT
ERR
Q
47k
= 20 A @I
C
OUT
V
3.0V/150mA
V
O
OUT
ERR
= 100 A)
MIC5236
Micrel

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MIC5236 Summary of contents

Page 1

... Capable of 150mA output, the MIC5236 has a dropout voltage of only 300mV. It can also survive an input transient of –20V to +60V Cap LDO, the MIC5236 is stable with either a ceramic or a tantalum output capacitor. It only requires a 1.0 F output capacitor for stability. The MIC5236 includes a logic compatible enable input and an undervoltage error flag indicator ...

Page 2

... MIC5236 Ordering Information Part Number * MIC5236-5.0BM MIC5236-5.0BMM MIC5236-3.3BM MIC5236-3.3BMM MIC5236-3.0BM MIC5236-3.0BMM MIC5236-2.5BM MIC5236-2.5BMM MIC5236BM MIC5236BMM *Conta5ct factory regarding availablity for voltages not listed Pin Configuration ERR OUT 8-Pin SOIC (M) 8-Pin MSOP (MM) ...

Page 3

... C ........................................................... 63 C +125 C; unless noted. J Min Typ –1 –2 50 0.2 0.15 0.3 50 230 270 300 20 0.5 1.5 2.8 0.1 260 = 1.0 F 160 200 A 150 OL 0.1 2.0 Micrel Max Units ppm/ C 0.5 % 1.0 % 0.3 % 0.5 % 0.6 % 1.0 % 100 mV 400 mV mV 500 0 4 350 mA Vrms % 98 % 250 mV 400 0 MIC5236 ...

Page 4

... The maximum allowable power dissipation of any T allowable power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The MIC5236-x.xBM (all versions C/W, and the MIC5236-x.xBMM (all versions C/W, mounted board (see “Thermal Charac- teristics” for further details). ...

Page 5

... TEMPERATURE ( C) 5 Micrel Dropout Voltage vs. Temperature 600 500 400 I = 150mA LOAD 300 200 100 MIC5236-3.0 0 -40 - 100 120 TEMPERATURE ( C) Ground Current vs. Supply Voltage 5 MIC5236-3 150mA LOAD OUT ...

Page 6

... EXTERNAL VOLTAGE (V) Note 10 MIC5236 Reverse Current IN OUT EN GND MIC5236 Overvoltage Threshold vs. Temperature 41 MIC5236-3 -40 - 100 120 TEMPERATURE ( C) Dropout Induced Error Flag 3.0 MIC5236-3.0 2 2.7V IN 2.0 V =2.62V OUT No Load 1.5 1.0 0 0.5 1.0 1.5 2.0 SINK CURRENT (mA) Reverse Current (Grounded Input Note 11 50 ...

Page 7

... MIC5236 Functional Characteristics Enable Transient Response TIME (250 s/div.) November 2000 10mA L 7 Micrel Load Transient Response OUT OUT ESR = 200m TIME (250 s/div.) MIC5236 ...

Page 8

... MIC5236 Functional Diagram MIC5236 IN EN Error Amplifier Error V REF Comparator 1.23V MIC5236-x.x GND 8 OUT R FB1 R FB2 R FB3 ERR November 2000 Micrel ...

Page 9

... OUT Reverse Current Protection The MIC5236 is designed to limit the reverse current flow from output to input in the event that the MIC5236 output has been tied to the output of another power supply. See the graphs detailing the reverse current flow with the input grounded and open. ...

Page 10

... Power SOP-8 Thermal Characteristics One of the secrets of the MIC5236’s performance is its power SO-8 package featuring half the thermal resistance of a standard SO-8 package. Lower thermal resistance means more output current or higher input voltage for a given package size ...

Page 11

... C, and the power dissipation is 639mW the curve in Figure 9 shows that the required area of copper 2 is 110mm 11 900 T = 125 C 800 J 700 600 500 400 300 200 100 0 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) Power Dissipation ( ,when using the power MSOP-8. Micrel MIC5236 ...

Page 12

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MIC5236 MAX) PIN 1 ...

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