MIC5157 Micrel Semiconductor, MIC5157 Datasheet

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MIC5157

Manufacturer Part Number
MIC5157
Description
Mic5156, Mic5157, And Mic5158 Super Ldo? Regulator Controller
Manufacturer
Micrel Semiconductor
Datasheet
1.MIC5157.pdf (13 pages)

Available stocks

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Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MIC5157BM
Manufacturer:
MICREL
Quantity:
25
Company:
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Part Number:
MIC5157BM
Manufacturer:
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Quantity:
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Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MIC5157YM
Manufacturer:
MIC
Quantity:
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Company:
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Part Number:
MIC5157YM
Manufacturer:
MICREL
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Company:
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Part Number:
MIC5157YM
Manufacturer:
MICREL/麦瑞
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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
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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MIC5157 Summary of contents

Page 1

... 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 • ...

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 ...

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– ...

Page 4

... LIM Short G (gate) to (S) source, Note 4 MIC5156-3.3 MIC5156-5.0 MIC5157, 3.3V pin to S pin (3.3V config.) MIC5157, 5V pin to S pin (5V config.) MIC5157 7V, (12V config.) DD MIC5158 pin to EA pin (5V config.) MIC5156 [adjustable] and MIC5158 5V < V < 15V ...

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 5.0 4.0 3.0 2 SUPPLY VOLTAGE (V) Charge-Pump Output Voltage vs. Supply Voltage SUPPLY VOLTAGE (V) Enable Threshold Voltage vs ...

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 ‡ ...

Page 7

... Super LDO Regulator Controllers. The MIC5157 and MIC5158 each have an internal charge pump which provides MOSFET gate drive voltage. The MIC5157 has a selectable fixed output of 3.3V, 5V, or 12V. The MIC5158 may be configured for a fixed 5V or adjustable output. Enable (EN) With at least 3 ...

Page 8

... MOSFET. It provides a constant load of about 1mA to the charge pump. The error amplifier output can swing to within Although the MIC5157/8 is designed to provide gate drive using its internal charge pump, an external gate drive sup- ply voltage can be applied When using an external CP ...

Page 9

... Fixed Configurations The MIC5156-3.3 and MIC5156-5.0 are preset for 3.3V and 5.0V respectively. The MIC5157 operates at 3.3V when the 3.3V pin is connected to the S (source) pin; 5.0V when the 5.0V pin is connected to the S pin; or 12V if the 3.3V and 5.0V pins are open. The MIC5158 operates at a fixed 5V (without an external resistive divider) if the 5V FB pin is connected to EA ...

Page 10

... MOSFET protects the MOSFET from overdrive during fault conditions. MIC5156/5157/5158 ) MIC5157 or MIC5158 is used and is shutdown for a given time, the charge pump reservoir V recharging the reservoir causes an unacceptable delay in the load reaching its operating voltage, do not use the EN pin for on/off control. Instead, use the MIC5158, hold EN high to keep the charge pump in continuous operation, and switch the MOSFET on or off by overriding the error amplifi ...

Page 11

... 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 as shown in figure (6 Two MOSFETs are placed source-to-source to prevent cur- rent flow through their body diodes when switched off. The Super LDO regulator is continuously enabled to achieve fast battery switch-in ...

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

MIC5156/5157/5158 .235 (5.969) .215 (5.461) .160 MAX (4.064) .160 (4.064) .100 (2.540) 0.154 (3.90) 0.026 (0.65) 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 ...

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