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5156BM Schematic ( Datenblatt PDF ) - Micrel Semiconductor

Teilenummer 5156BM
Beschreibung MIC5156BM
Hersteller Micrel Semiconductor
Logo Micrel Semiconductor Logo 

Gesamt 16 Seiten
		
5156BM Datasheet, Funktion
www.DataSheet.co.kr
MIC5156/5157/5158
Micrel
MIC5156/5157/5158
Super LDO™ Regulator Controller
Final Information
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 RDS(ON) of the external power MOSFET multiplied by 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 internal
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
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 SOP. The
MIC5157 and MIC5158 are available in a 14-pin DIP or SOP
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 SOP
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
Typical Applications
+12V
0.1µF
Enable
Shutdown
4321
1.0µF
0.1µF
7 6 5 4 3 21
MIC5156-3.3
MIC5157
5678
VIN
5V
47µF
3m
RS
RS = 0.035V / ILIMIT
SMP60N03-10L
CL*
47µF
VOUT
3.3V, 10A
* Improves transient
response to load changes
10A 5V to 3.3V Desktop Computer Regulator
8 9 10 11 12 13 14
0.1µF
VIN
(3.61V min.)
47µF
RS = 0.035V / ILIMIT
3m
RS
Enable
Shutdown
CL*
47µF
VOUT
3.3V, 10A
* Improves transient
IRLZ44 (Logic Level MOSFET)
response to load changes
10A Low-Dropout Voltage Regulator
Super LDO is a trademark of Micrel, Inc.
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
March 1999
1 MIC5156/5157/5158
Datasheet pdf - http://www.DataSheet4U.net/






5156BM Datasheet, Funktion
www.DataSheet.co.kr
MIC5156/5157/5158
Block Diagram MIC5156
+12V Input
0.1µF
VP
+5V Input
VDD
Micrel
12k
+5V Input
Switched
5V Load
Q2
FLAG
Internal
Bias
EN
Enable
Shutdown
RS
3m
1.235V
Bandgap
Reference
VOUT
Comparator
Error
Amp
75mV
* fixed version only
3.3V = 17k, 5V = 32k
to all
internal blocks
ILIMIT
Comparator
35mV
D (Drain)
[ILIMIT]
G (Gate)
16.6V
S* (Source)
17k
Q1
SMP60N03-10L
Regulated
+3.3V Output
10k
CL
GND
adjustable version only
EA
Block Diagram with External Components
Fixed 3.3V Power Supply with 5.0V Load Switch
Block Diagram MIC5157
0.1µF C1 0.1µF C2
C1+ C1C2+ C2VCP
C3
1µF
+5V Input
VDD
Oscillator
Charge Pump
Tripler
FLAG
1.235V
Bandgap
Reference
VOUT
Comparator
Error
Amp
75mV
VCP
Clamp
Internal
Bias
EN
Enable
Shutdown
RS
3m
to all
internal blocks
ILIMIT
Comparator
35mV
D (Drain)
[ILIMIT]
G (Gate)
16.6V
S (Source)*
58k 5V
CL
15k 3.3V
Q1
IRFZ44
Regulated
+3.3V Output
17k
10k GND
MIC5156/5157/5158
Block Diagram with External Components
Fixed 3.3V 10A Power Supply
6
March 1999
Datasheet pdf - http://www.DataSheet4U.net/

6 Page







5156BM pdf, datenblatt
www.DataSheet.co.kr
MIC5156/5157/5158
Package Information
PIN 1
DIMENSIONS:
INCH (MM)
0.380 (9.65)
0.370 (9.40)
0.135 (3.43)
0.125 (3.18)
0.255 (6.48)
0.245 (6.22)
0.300 (7.62)
0.018 (0.57)
0.100 (2.54)
0.130 (3.30)
0.0375 (0.952)
0.380 (9.65)
0.320 (8.13)
0.013 (0.330)
0.010 (0.254)
8-Pin DIP (N)
0.026 (0.65)
MAX)
0.157 (3.99)
0.150 (3.81)
PIN 1
DIMENSIONS:
INCHES (MM)
0.050 (1.27)
TYP
0.020 (0.51)
0.013 (0.33)
0.0098 (0.249)
0.0040 (0.102)
0.064 (1.63)
0.045 (1.14)
0.197 (5.0)
0.189 (4.8)
0°8°
SEATING
PLANE
45° 0.010 (0.25)
0.007 (0.18)
0.050 (1.27)
0.016 (0.40)
0.244 (6.20)
0.228 (5.79)
8-Pin SOP (M)
Micrel
MIC5156/5157/5158
12
March 1999
Datasheet pdf - http://www.DataSheet4U.net/

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