MIC2920A-5.0WT Micrel Inc, MIC2920A-5.0WT Datasheet - Page 5

• Manufacturer Part Number: MIC2920A-5.0WT
• Description: IC REG LDO 400MA 5.0V TO-220-3
• Manufacturer: Micrel Inc

Specifications of MIC2920A-5.0WT

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.4V @ 400mA
• Number Of Regulators: 1
• Current - Output: 400mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-3 (Straight Leads)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: 576-2221; MIC2920A-5.0WT

MIC2920A/29201/29202/29204
Notes:
General:
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Schematic Diagram
February 2005
Devices are ESD protected; however, handling precautions are recommended.
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, T
power dissipation at any ambient temperature is calculated using: P
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.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
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.
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.
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.
The MIC2920A features fold-back current limiting. The short circuit (V
output voltage.
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
V
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 = V
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.
V
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.
Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( ≤ 1%). The maximum continuous supply
voltage is 26V.
REF
SHUTDOWN
≤ V
OUT
≥ 2V, V
≤ (V
IN
IN
– 1 V), 4.3V ≤ V
≤ 26V,V
50 kΩ
10 kΩ
J (MAX)
Q42
Q40
OUT
R30
, the junction-to-ambient thermal resistance, θ
kΩ
Q6
30
50 kΩ
= 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 ≥ 150kΩ.
20 kΩ
Q41
R2
R1
10
Q1
Q3
IN
≤ 26V, 1 mA < I
50 kΩ
R3
R11
18
kΩ
E R R O R
180
IN
R5
kΩ
C1
20
pF
Q13
13 kΩ
R4
140
R6
kΩ
Q4
Q38
Q12
Q39
Q2
Q5
Q37
31.4 kΩ
27.8 kΩ
L
R11
20.6
≤400 mA, T
R9
R8
Q15A
kΩ
R26
60 kΩ
Q7
Q11
Q36
R10
150
kΩ
Q8
R25
2.8 kΩ
Q9
5
J
Q34
≤ T
(MAX)
R12
110
J MAX.
Q20
kΩ
IN
OUT
= 20V (a 4W pulse) for T = 10ms.
= (T
= 0V) current limit is less than the maximum current with normal
Q18
JA
Q16
R13
100
GND
kΩ
, and the ambient temperature, T
J(MAX)
R22
150 kΩ
Q15B
Q17
R14
350
kΩ
– T
C2
40 pF
A
) / θ
Q30
Q19
Q14
D E NO T E S CO NNE CT I O N O N
MIC2920A-xx AND MIC29201-xx
V E R S I O N S O N L Y
Q31
JA.
Q21
Exceeding the maximum allowable power
12 kΩ
Q29
R17
A D J U S T
R24
50 kΩ
Q28
Q22
R15
100 kΩ
R16
30 kΩ
Q25
R23 60 kΩ
R21 8 Ω
R18
20kΩ
Q26
10 Ω
R17
Q23
A
SHDN
. The maximum allowable
R27
R28
Q24
OUT
S E N S E
V TAP
OUT
/V
REF
= (R1 + R2)/R2.
M9999-021505
Micrel, Inc.