MIC5157BM Micrel Inc, MIC5157BM Datasheet

IC CTRLR LDO REG SELECTBL 14SOIC

MIC5157BM

Manufacturer Part Number
MIC5157BM
Description
IC CTRLR LDO REG SELECTBL 14SOIC
Manufacturer
Micrel Inc
Type
Positive Fixedr
Datasheet
1.MIC5156YM.pdf (13 pages)

Specifications of MIC5157BM

Number Of Outputs
1
Voltage - Output
3.3V, 5V, 12V
Current - Supply
4.5mA
Voltage - Input
3 ~ 36 V
Operating Temperature
-40°C ~ 85°C
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MIC5157BM
Manufacturer:
MICREL
Quantity:
25
Company:
Meier Automation Equipment Co., Limited Meier Automation Equipment Co., Limited
Part Number:
MIC5157BM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
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
R
S
= 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)
V
5V
IN
LIMIT
47µF
of the external power MOSFET multiplied by
SMP60N03-10L
3mΩ
R
MIC5156-3.3
+12V
S
4
5
0.1µF
3
6
2
7
Shutdown
Enable
1
8
C
47µF
L
*Improves transient
*
response to load changes
V
3.3V, 10A
OU T
1
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.)
R
S
= 0.035V /I
V
IN
Super LDO™ Regulator Controller
10A Low-Dropout Voltage Regulator
IRLZ44 (Logic Level MOSFET)
MIC5156/5157/5158
LIMIT
0.1µF
47µF
0.1µF
7
8
6
9
3mΩ
R
S
MIC5157
1.0µF
10
5
4
11
12
3
13
Shutdown
2
Enable
C
47µF
L
*Improves transient
*
14
response to load changes
1
MIC5156/5157/5158
V
3.3V, 10A
OU T
Micrel, Inc.

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MIC5157BM Summary of contents

Page 1

MIC5156/5157/5158 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 ...

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) EA ...

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 ) ...

Page 5

MIC5156/5157/5158 Typical Characteristics 3.3V Regulator Output Voltage vs. Temperature 3.34 3.33 3.32 3.31 3.30 3.29 3.28 3.27 3.26 -60 - 120 150 TEMPERATURE (°C) MIC5157/8 On-State Supply Current vs. Supply Voltage 10.0 9.0 8.0 7.0 6.0 ...

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 ...

Page 7

MIC5156/5157/5158 Block Diagram MIC5158 Oscillator Functional Description A Super LDO Regulator is a complete regulator built around Micrel’s Super LDO Regulator Controller. Refer to Block Diagrams MIC5156, MIC5157, and MIC5158. Version Differences The MIC5156 requires an ...

Page 8

MIC5156/5157/5158 Charge Pump (MIC5157/5158 only) The charge pump tripler creates a dc voltage across reservoir capacitor C3. External capacitors C1 and C2 provide the nec- essary storage for the stages of the charge pump tripler. The tripler’s approximate dc output ...

Page 9

MIC5156/5157/5158 G MIC5157 S or MIC5158 E A GND Figure 1b. Connections for Adjustable Output G MIC5156 E A GND * Optional 16V zener diode recommended in applications where V is greater than 18V G Figure 1c. MIC5156 Connections for ...

Page 10

MIC5156/5157/5158 Current Limiting Current sensing requires a low-value series resistance (R between V and D (drain). Refer to the typical applications. DD The internal current-limiting circuit limits the voltage drop across the sense resistor to 35mV. Equation (2) provides the ...

Page 11

MIC5156/5157/5158 MIC5158 GND R 2 Figure 5. Battery Charger Concept August 2005 Uninterruptible Power Supply V IN The MIC5157 and two N-channel MOSFETs provide battery switching for uninterruptible power ...

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) ...

Page 13

... MAX) 0.057 (1.45) 0.049 (1.25) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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