MIC2940A-3.3BT Micrel Inc, MIC2940A-3.3BT Datasheet - Page 4

• Manufacturer Part Number: MIC2940A-3.3BT
• Description: IC REG LDO 1.25A 3.3V TO220-3
• Manufacturer: Micrel Inc

Specifications of MIC2940A-3.3BT

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.4V @ 1.25A
• Number Of Regulators: 1
• Current - Output: 1.25A
• 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): -

Electrical Characteristics (MIC2941A Only)
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. 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.
11. Maximum positive supply voltage of 60 V must be of limited duration (< 100 ms) and duty cycle (≤ 1%). The maximum continuous supply voltage is
Micrel, Inc.
Parameter
Reference Voltage
Adjust Pin Bias Current
Reference Voltage Temperature Coefficient
Adjust Pin Bias Current Temperature
Coefficient
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output Current in Shutdown
July 2007
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
temperature is calculated using: P
temperature, and the regulator will go into thermal shutdown.
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 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.
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.
The MIC2940A features fold-back current limiting. The short circuit (V
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
Circuit of Figure 3 with R1 ≥ 150k Ω. V
26V.
J(MAX)
REF
≤ V
, the junction-to-ambient thermal resistance, θ
OUT
≤ (V
IN
– 1 V), 4.3V ≤ V
(MAX)
IN
26V, 5mA < I
= (T
SHUTDOWN
J(MAX)
≥ 2 V and V
– T
L
Condition
(Note 8)
Low (ON)
High (OFF)
V
V
(Note 10)
≤1.25A, T
A
JA
SHUTDOWN
SHUTDOWN
) / θ
, and the ambient temperature, T
JA
. Exceeding the maximum allowable power dissipation will result in excessive die
IN
J
≤ 26 V,V
≤T
= 2.4V
= 26V
J(MAX)
IN
= 20V (a 4W pulse) for T = 10ms.
.
OUT
OUT
= 0V) current limit is less than the maximum current with normal output
= 0.
4
A
. The maximum allowable power dissipation at any ambient
1.223
1.210
1.204
Min
2.0
1.235
Typ
450
0.1
1.3
0.7
20
20
30
3
MIC2940A/2941A
1.247
1.260
1.266
Max
100
600
750
40
60
50
30
60
M9999-071307
ppm/°C
nA/°C
Units
nA
nA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V