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PDF MIC29202BU Data sheet ( Hoja de datos )
| Número de pieza | MIC29202BU | |
| Descripción | 400mA Low-Dropout Voltage Regulator | |
| Fabricantes | Micrel Semiconductor | |
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MIC2920A/29201/29202/29204
Micrel
MIC2920A/29201/29202/29204
400mA Low-Dropout Voltage Regulator
General Description
The MIC2920A family are “bulletproof,” efficient voltage
regulators with very low dropout voltage (typically 40mV at
light loads and 370mV at 250mA), and very low quiescent
current (140µA typical). The quiescent current of the MIC2920A
increases only slightly in dropout, prolonging battery life. Key
MIC2920A features include protection against reversed battery,
fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
The MIC2920 is available in several configurations. The
MIC2920A-x.x devices are three pin fixed voltage regulators
available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201
is a fixed regulator offering a logic compatible ON/OFF
(shutdown) 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 MIC29202
which allows the regulator to be switched on and off. The
MIC29204 8-pin SOIC adjustable regulator includes both
shutdown and error flag pins and may be pin-strapped for 5V
output or programmed from 1.24V to 26V using two external
resistors.
Features
• High output voltage accuracy
• Guaranteed 400mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input withstands –20V reverse battery and
60V positive transients
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V
(MIC29202/MIC29204)
• Available in TO-220, TO-220-5, and surface-mount
TO-263-5, SOT-223, and SO-8 packages.
Applications
• Battery-powered equipment
• Cellular telephones
• Laptop, notebook, and palmtop computers
• PCMCIA V and V regulation/switching
CC PP
• Bar code scanners
• Automotive electronics
• SMPS post-regulators
• Voltage reference
• High-efficiency linear power supplies
Pin Configuration
OUTPUT 1
SENSE 2
SHUTDOWN 3
GROUND 4
8 INPUT
7 NC
6 NC
5 ERROR
MIC29201-3.3BM (SO-8)
OUTPUT 1
SENSE 2
SHUTDOWN 3
GROUND 4
8 INPUT
7 ADJUST
6 5V TAP
5 ERROR
TAB
123
INPUT OUTPUT
GROUND
MIC2920A-x.xBS
(SOT-223)
MIC29204BM (SO-8)
5-Lead Package Pinouts
MIC29201 MIC29202
1) Error
Adjust
2) Input
Shutdown
3) Ground
Ground
4) Output
Input
5) Shutdown Output
January 1998
12345
MIC29201/29202BU
(TO-263-5)
12 3
INPUT OUTPUT
GROUND
MIC2920A-xxBT
(TO-220)
12345
MIC29201/29202BT
(TO-220-5)
Tab is Ground on SOT-223, TO-220, and TO-263 packages.
3-9
3
1 page  
MIC2920A/29201/29202/29204
Micrel
General Note: Devices are ESD protected; however, handling precautions are recommended.
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. The junction to ambient thermal
resistance of the MIC29204BM is 160°C/W mounted on a PC board.
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 100mV 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 MIC2920A 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 supply is the sum of the load current plus
the ground pin current.
Note 6: The MIC2920A 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 V = 20V (a 4W pulse) for T = 10ms.
IN
Note 8: VREF ≤ VOUT ≤ (VIN – 1 V), 4.3V ≤ VIN ≤ 26V, 1 mA < IL ≤400 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. 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: VSHUTDOWN ≥ 2V, VIN ≤ 26V,VOUT = 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 ≥ 150kΩ.
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.
3
Schematic Diagram
IN ADJUST
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 R23 60 kΩ
50 kΩ
SHDN
GND
DENOTES CONNECTION ON
MIC2920A-xx AND MIC29201-xx
VERSIONS ONLY
January 1998
3-13
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MIC29202BU.PDF ] | |
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