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PDF MIC29372 Data sheet ( Hoja de datos )
| Número de pieza | MIC29372 | |
| Descripción | 750mA Low-Dropout Voltage Regulator | |
| Fabricantes | Micrel Semiconductor | |
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Hay una vista previa y un enlace de descarga de MIC29372 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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MIC2937A/29371/29372
Micrel
MIC2937A/29371/29372
750mA Low-Dropout Voltage Regulator
General Description
The MIC2937A family are “bulletproof” efficient voltage
regulators with very low dropout voltage (typically 40mV at
light loads and 300mV at 500mA), and very low quiescent
current (160µA typical). The quiescent current of the MIC2937A
increases only slightly in dropout, thus prolonging battery life.
Key MIC2937A features include protection against reversed
battery, fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
The MIC2937 is available in several configurations. The
MIC2937A-xx devices are three pin fixed voltage regulators
with 3.3V, 5V, and 12V outputs available. The MIC29371 is a
fixed regulator offering logic compatible ON/OFF switching
input and an error flag output. This flag may also be used as
a power-on reset signal. A logic-compatible shutdown input is
provided on the adjustable MIC29372, which enables the
regulator to be switched on and off.
Features
• High output voltage accuracy
• Guaranteed 750mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input can withstand –20V reverse battery and +60V
positive transients
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V(MIC29372)
• Available in TO-220, TO-263, TO-220-5, and TO-263-5
packages.
Applications
• Battery Powered Equipment
• Cellular Telephones
• Laptop, Notebook, and Palmtop Computers
• PCMCIA VCC and VPP Regulation/Switching
• Bar Code Scanners
• Automotive Electronics
• SMPS Post-Regulator/ DC to DC Modules
• High Efficiency Linear Power Supplies
Pin Configuration
INPUT GROUND OUTPUT
TO-263 Package
(MIC2937A-xxBU)
1 2345
TO-263-5 Package
(MIC29371/29372BU)
Five Lead Package Pin Functions:
MIC29371 MIC29372
1) Error
Adjust
2) Input
Shutdown
3) Ground Ground
4) Output
Input
5) Shutdown Output
12 3
INPUT FGrRonOtUVNieDw OUTPUT
1 2345
TO-220 Package
(MIC2937A-xxBT)
TO-220-5 Package
(MIC29371/29372BT)
The TAB is Ground on the TO-220 and TO-263 packages.
3-18
June 1997
1 page  
MIC2937A/29371/29372
Micrel
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not
apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the
maximum junction temperature, TJ ,(MAX) the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation at any ambient temperature is calculated using: P(MAX) = (TJ(MAX) – TA) / θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to
heating effects are covered by the thermal regulation specification.
Note 4: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value
measured at 1V differential. At low values of programmed output voltage, the minimum input supply voltage of 4.3V over temperature must
be taken into account. The MIC2937A operates down to 2V of input at reduced output current at 25°C.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus
the ground pin current.
Note 6: The MIC2937A family features fold-back current limiting. The short circuit (VOUT = 0V) current limit is less than the maximum current
with normal output voltage.
Note 7: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding
load or line regulation effects. Specifications are for a 200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms.
Note 8: VREF ≤ VOUT ≤ (VIN – 1 V), 4.3V ≤ VIN ≤ 26V, 5mA < IL ≤ 750 mA, TJ ≤ TJ MAX.
Note 9: Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage
measured at 6V input (for a 5V regulator). To express these thresholds in terms of output voltage change, multiply by the error amplifier gain
= VOUT /VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output
drops by 95 mV x 5V/1.235 V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning
occurring at typically 5% below nominal, 7.7% guaranteed.
Note 10: Circuit of Figure 3 with R1 ≥ 150kΩ. VSHUTDOWN ≥ 2V and VIN ≤ 26V,VOUT = 0.
Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode
clamped to ground.
Note 12: Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( ≤ 1%). The maximum continuous
supply voltage is 26V.
Schematic Diagram
IN FEEDBACK
Q15A
Q3
Q6
Q1
10
R1
Q42 20 kΩ
R2
50 kΩ
Q40
Q41
R11
18
kΩ
C1
20
pF
Q4 Q7
Q5
R11
20.6
kΩ
Q2
Q9
Q8
R8
31.4 kΩ
R10
150
kΩ
R5 R6
180 140
kΩ kΩ
R9
27.8 kΩ
Q13 Q12
Q11
R30
30
kΩ R3 R4
50 kΩ
13 kΩ
Q20
R12
110
kΩ
50 kΩ
10 kΩ
ERROR
Q37 Q36
Q38
R26
60 kΩ
Q39
Q34
R25
2.8 kΩ
Q15B
Q16 Q17
R17
Q14 12 kΩ
R18
20kΩ
Q26
Q25
Q24
OUT
SENSE
R27
V TAP
R28
R13
100
kΩ
Q18
C2
40 pF
Q21
R14
350
kΩ
Q19
Q29
Q22
R15
100 kΩ
Q23
R16
30 kΩ
R17
10 Ω
Q28
R22
150 kΩ
Q30 Q31
R21 8 Ω
R24
50 kΩ
R23 60 kΩ
SHDN
GND
DENOTES CONNECTION ON
MIC2937A-xx AND MIC29371-xx
VERSIONS ONLY
3-22
June 1997
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MIC29372.PDF ] | |
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