MIC5270 Datasheet, PDF (2/4 Pages) Micrel Semiconductor – IttyBitty™ Negative Low-Dropout Regulator Preliminary Information

MIC5270
Absolute Maximum Ratings (Note 1)
Input Voltage (V_–IN) ....................................... –20V to +20V
Power Dissipation (P_D) ............................ Internally Limited
Junction Temperature (T_J) ....................... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T_S) ....................... –65°C to +150°C
ESD Rating, Note 3
Micrel
Operating Ratings (Note 2)
Input Voltage (V_IN) .......................................... –16V to –2V
Junction Temperature (T_J) ....................... –40°C to +125°C
Thermal Resistance (θ_JA)......................................... Note 4
Electrical Characteristics
V_IN = V_OUT – 1.0V; C_OUT = 4.7µF, I_OUT = 100µA; T_J = 25°C, bold values indicate –40°C ≤ T_J ≤ +125°C; unless noted.
Symbol
Parameter
Condition
Min Typ Max
Units
V_OUT
Output Voltage Accuracy
Variation from nominal V_OUT
–2
2
%
–3
3
%
∆V_OUT/∆T
Output Voltage Temperature
Coefficient
Note 5
100
ppm/°C
∆V_OUT/V_OUT
∆V_OUT/V_OUT
V_IN – V_OUT
Line Regulation
Load Regulation
Dropout Voltage, Note 7
I_GND
Ground Current, Note 8
PSRR
Ripple Rejection
V_IN = V_OUT – 1V to –16V
I_OUT = 100µA to 100mA, Note 6
I_OUT = 100µA
I_OUT = 10mA
I_OUT = 50mA
I_OUT = 100mA
I_OUT = 100µA
I_OUT = 10mA
I_OUT = 50mA
I_OUT = 100mA
f = 120Hz
0.055 0.15 %/V
2.0
%
35
mV
250
mV
360 450 mV
480 600 mV
70
µA
250
µA
0.7
mA
2.1
3.0
mA
50
dB
I_LIMIT
∆V_OUT/∆P_D
Current Limit
Thermal Regulation
V_OUT = 0V
Note 9
160 300 mA
0.05
%/W
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
The maximum allowable power dissipation is a function of the maximum junction temperature, T_J(max), the junction-to-ambient thermal
resistance, θ_JA, and the ambient temperature, T_A. The maximum allowable power dissipation at any ambient temperature is calculated using:
P_D(max) = (T_J(max) – T_A) ÷ θ_JA, where θ_JA is 235°C/W. Exceeding the maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” section for details.
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. Parts are tested for load regulation in the load
range from 100µA to 100mA. 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 2% below its nominal value measured at 1V
differential.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
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 100mA load pulse at V_IN = –16V for t = 10ms.
MIC5270
284
March 1999