MIC5156-5.0BM Micrel Inc, MIC5156-5.0BM Datasheet

MIC5156-5.0BM

Manufacturer Part Number

MIC5156-5.0BM

Description

IC CTRLR LDO REG 5.0V 8-SOIC

Manufacturer

Micrel Inc

Type

Positive Fixedr

Datasheet

1.MIC5156YM.pdf (13 pages)

Specifications of MIC5156-5.0BM

Number Of Outputs

Voltage - Output

Current - Supply

2.7mA

Voltage - Input

3 ~ 36 V

Operating Temperature

-40°C ~ 85°C

Package / Case

8-SOIC (3.9mm Width)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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General Description

The MIC5156, MIC5157, and MIC5158 Super Low-Dropout

(LDO) Regulator Controllers are single IC solutions for high-

current low-dropout linear voltage regulation. Super LDO™

Regulators have the advantages of an external N-channel

power MOSFET as the linear pass element.

The MIC5156/7/8 family features a dropout voltage as low

as the R

the output current. The output current can be as high as the

largest MOSFETs can provide.

The MIC5156/7/8 family operates from 3V to 36V. The

MIC5156 requires an external gate drive supply to provide

the higher voltage needed to drive the gate of the external

MOSFET. The MIC5157 and MIC5158 each have an inter-

nal charge pump tripler to produce the gate drive voltage.

The tripler is capable of providing enough voltage to drive a

logic-level MOSFET to 3.3V output from a 3.5V supply and

is clamped to 17.5V above the supply voltage. The tripler

requires three external capacitors.

The regulator output is constant-current limited when the

controller detects 35mV across an optional external sense

resistor. An active-low open-collector ﬂag indicates a low

voltage of 8% or more below nominal output. A shutdown

(low) signal to the TTL-compatible enable control reduces

controller supply current to less than 1µA while forcing the

output voltage to ground.

The MIC5156-3.3 and MIC5156-5.0 controllers have inter-

nally ﬁxed output voltages. The MIC5156 [adjustable] output

is conﬁgured using two external resistors. The MIC5157 is a

ﬁxed output controller which is externally conﬁgured to select

Typical Applications

Super LDO is a trademark of Micrel, Inc.

August 2005

MIC5156/5157/5158

= 0.035V /I

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

10A 5V to 3.3V Desktop Computer Regulator

DS(ON)

LIMIT

47µF

of the external power MOSFET multiplied by

SMP60N03-10L

3mΩ

MIC5156-3.3

+12V

0.1µF

Shutdown

Enable

47µF

*Improves transient

response to load changes

3.3V, 10A

OU T

either 3.3V, 5.0V, or 12V. The MIC5158 can be conﬁgured

as a ﬁxed 5V controller or programmed to any voltage from

1.3V to 36V using two external resistors.

The MIC5156 is available in an 8-pin DIP or SOIC. The

MIC5157 and MIC5158 are available in a 14-pin DIP or SOIC

which operate from –40°C to +85°C.

Features

• 4.5mA typical operating current

• <1µA typical standby current

• Low external parts count

• Optional current limit (35mV typical threshold)

• 1% initial output voltage tolerance in most conﬁgurations

• 2% output voltage tolerance over temperature

• Fixed output voltages of 3.3V, 5.0V (MIC5156)

• Fixed output voltages of 3.3V, 5.0V, 12V (MIC5157)

• Programmable (1.3 to 36V) with 2 resistors (MIC5156/8)

• Internal charge pump voltage tripler (MIC5157/8)

• Enable pin to activate or shutdown the regulator

• Internal gate-to-source protective clamp

• All versions available in DIP and SOIC

Applications

• Ultrahigh current ultralow dropout voltage regulator

• Constant high-current source

• Low parts count 5.0V to 3.3V computer supply

• Low noise/low-dropout SMPS post regulator

• High-current, current-limited switch

(3.61Vmin.)

= 0.035V /I

Super LDO™ Regulator Controller

10A Low-Dropout Voltage Regulator

IRLZ44 (Logic Level MOSFET)

MIC5156/5157/5158

LIMIT

0.1µF

47µF

0.1µF

3mΩ

MIC5157

1.0µF

Shutdown

Enable

47µF

*Improves transient

response to load changes

MIC5156/5157/5158

3.3V, 10A

OU T

Micrel, Inc.

Related parts for MIC5156-5.0BM

MIC5156-5.0BM Summary of contents

Page 1

... The MIC5158 can be conﬁgured as a ﬁxed 5V controller or programmed to any voltage from 1.3V to 36V using two external resistors. The MIC5156 is available in an 8-pin DIP or SOIC. The MIC5157 and MIC5158 are available in a 14-pin DIP or SOIC which operate from –40°C to +85°C. ...

Page 2

... MIC5156/5157/5158 Ordering Information MIC5156 Part Number Standard MIC5156-3.3BN MIC5156-5.0BN MIC5156BN MIC5156-3.3BM MIC5156-5.0BM MIC5156BM Ordering Information MIC5157 Part Number Standard MIC5157BN MIC5157BM Ordering Information MIC5158 Part Number Standard MIC5158BN MIC5158BM Pin Conﬁguration MIC5156-x GND MIC5157 GND C2– 6 C2+ 7 MIC5156/5157/5158 Temperature ...

Page 3

... MIC5156/5157/5158 Pin Description MIC5156 Pin Number Pin Name FLAG 3 GND (3.3V, 5V) 8 (adjustable) EA Pin Description MIC5157, MIC5158 Pin Number Pin Name 1 (MIC5157 (MIC5158 (MIC5157) 3.3V 2 (MIC5158 FLAG 4 GND C2– 7 C2+ 8 C1+ 9 C1– (MIC5157) 13 (MIC5158 August 2005 Pin Function Enable (Input): TTL high enables regulator; TTL low shuts down regulator. ...

Page 4

... MIC5156/5157/5158 Absolute Maximum Ratings Supply Input (V ) ....................................................... +38V DD Enable Input (V ) ..........................................–0.3V to 36V EN Gate Output (V ) MIC5156 ......................................... +55V G Charge Pump Node (V ) MIC5157/8 ........................ +55V CP Source Connection (V ) ................................... 1.3 to +36V S Flag (V ) .................................................... –0.3 to +40V FLAG Storage Temperature (T ) ........................ –65°C to +150°C S Lead Temperature (soldering 10 sec.) ....................... 300°C Electrical Characteristics ...

Page 5

... DD 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 - 120 150 TEMPERATURE (°C) Flag Output Voltage vs. Flag Current 1 0.9 DD 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 FLAG SINK CURRENT (mA) Current Limit Threshold vs. Temperature -60 - 120 150 TEMPERATURE (°C) MIC5156/5157/5158 ...

Page 6

... MIC5156/5157/5158 Block Diagram MIC5156 12k +5V Input Switched 5V Load Block Diagram MIC5157 Oscillator MIC5156/5157/5158 +12V Input 0.1µ 1.235V Bandgap I LIMIT Reference Comparator V Error OU T Comparator Amp 75mV * fixed version only 3.3V = 17k 32k † adjustable version only ‡ Block Diagram with External Components Fixed 3 ...

Page 7

... MOSFET is fully enhanced, an additional higher supply voltage is required to produce the necessary gate-to-source enhancement. This higher gate drive voltage is provided by an external gate drive supply (MIC5156 internal charge pump (MIC5157 and MIC5158). Gate Drive Supply Voltage (MIC5156 only) The gate drive supply voltage must not be more than 14V ...

Page 8

... Standard N-channel enhancement-mode MOSFETs are ac- ceptable for most Super LDO regulator applications. Logic-level N-channel enhancement-mode MOSFETs may be necessary if the external gate drive voltage is too low (MIC5156), or the input voltage is too low, to provide adequate charge pump voltage (MIC5157/8) to enhance a standard MOSFET. Circuit Layout For the best voltage regulation, place the source, ground, and error ampliﬁ ...

Page 9

... Some linear regulators specify a minimum required output ﬁlter capacitance because the capacitor determines the dominant pole of the system, and thereby stabilizes the system. This is not the situation for the MIC5156/7/8; its dominant pole is determined within its error ampliﬁer ...

Page 10

... The Super LDO regulator can pro- vide a signiﬁcant reduction in peak-to-peak ripple voltage. High-Current Switch Application All versions of the MIC5156/7/8 may be used for current-lim- ited, high-current, high-side switching with or without voltage regulation. See ﬁgure (4a). Simply leave the “S” terminal open ...

Page 11

... Line MIC5158 S MOSFET body diodes S shown for clarity GND 40V max. 1N4148 Line Battery A C Off-line Uninterruptable Power Supply D C Figure 6. UPS Power Supply Concept MIC5156/5157/5158 Micrel, Inc. ...

Page 12

... MIC5156/5157/5158 Package Information 0.018 (0.57) MIC5156/5157/5158 PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) 0.380 (9.65) 0.130 (3.30) 0.320 (8.13) 0.100 (2.54) 0.0375 (0.952) 8-Pin DIP (N) 8-Pin SOIC (M) 12 Micrel, Inc. 0.255 (6.48) 0.245 (6.22) 0.300 (7.62) 0.013 (0.330) ...

Page 13

... FAX WEB Micrel for any damages resulting from such use or sale. © 1999 Micrel, Inc. 13 .310 (7.874) .280 (7.112) .015 (0.381) .008 (0.2032) .400 (10.180) .330 (8.362) 0.193 (4.90) 45 3–6 0.244 (6.20) 0.228 (5.80) http://www.micrel.com MIC5156/5157/5158 Micrel, Inc. ...

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