MIC68401 Datasheet, PDF (5/13 Pages) Micrel Semiconductor – 4A Sequencing LDO with Tracking and Ramp Control™

Micrel, Inc.
MIC68401
Electrical Characteristics⁽⁵⁾ (Continued)
TA = 25°C with VIN = VOUT + 1V; VEN = VIN; IOUT = 10mA; bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Conditions
Min. Typ.
Max.
Units
POR Output
IPOR(LEAK)
POR pin inactive (open drain, high)
VPOR = 5.5V
1
µA
2
VPOR(LO)
POR pin active, output logic-low voltage
IPOR = 1mA
60
90
mV
POR Threshold
VOUT ramping up. % of VOUT below nominal
7.5
10 12.5
%
POR Threshold Hysteresis
VOUT ramping down. Amount that the POR threshold shifts from
the ramp up threshold, when it is ramping down.
2.5
3
%
DELAY Pin Current
DELAY Threshold Voltage⁽⁶⁾
VDELAY = 0.75V
VPOR = High
0.7
1
1.3
µA
1.185 1.235 1.285 V
Ramp Control
IRC
IDISCHARGE(7)
Tracking Accuracy⁽⁸⁾
Ramp Control Current (VRC = 0.75V)
VOUT = 0.5VNOM, VRAMP = 0V
Measure (VOUT − VRC × (VTARGET / 500mV))
0.7
1
1.3
µA
25
45
70
mA
−10 15
50
mV
Notes:
6. Timer high voltage along with DELAY pin current (1µA, nominal) determines the delay per µF of capacitance. Typical delay is 1.235sec/µF.
7. The discharge current (IDISCHARGE), is the current drawn from the output to ground to actively discharge the output capacitor during the
shutdown process.
8. VTARGET is the desired output voltage.
November 7, 2013
5
Revision 1.0