ADP2140
Data Sheet
Rev. A | Page 22 of 32
EN1
V
BUCK
EN2 = UNCONNECTED
V
LDO
PG
92% V
BUCK
85% V
LDO
92% V
LDO
t
SS
t
SS
t
START
t
RESET
t
REG12
TIME
0
Figure 71. Autosequencing Mode, Buck First Then LDO
EN1
V
BUCK
V
LDO
PG
85% V
BUCK
t
SS
t
REG12
TIME
EN2 = UNCONNECTED
t
START
92% V
LDO
92% V
BUCK
t
SS
t
RESET
Figure 72. Autosequencing Mode, LDO First Then Buck
The PG responds to the last activated regulator. As described in
the Power Sequencing section, the regulator order in the auto-
sequencing mode is defined by the voltage option combination.
Therefore, if the sequence is buck first, the LDO and the PG
signal are active low for tRESET after VLDO reaches 92% of the rated
output voltage, at which time PG goes high and remains high
for as long as VLDO is above 86% of the rated output voltage.
When the sequencing is LDO first then buck, V
BUCK
controls
PG. This control scheme also applies when the individual
activation mode is selected.
As soon as either regulator output voltage drops below 86% of
the respective nominal level, the PG pin is forced low.
EN2
EN1
V
BUCK
V
LDO
PG
92% V
LDO
t
RESET
t
RESET
92% V
BUCK
85% V
BUCK
95%
V
BUCK
85%
V
BUCK
85% V
LDO
Figure 73. Individual Activation Mode, Both Regulators Sensed
EN2
EN1
V
BUCK
V
LDO
PG
92% V
LDO
t
RESET
92% V
BUCK
85% V
BUCK
85% V
LDO
Figure 74. Individual Activation Mode, One Regulator Only (Buck) Sensed
t
RESET
92% V
BUCK
92% V
LDO
85% V
BUCK
85% V
LDO
EN1
EN2
PG
V
LDO
V
BUCK
Figure 75. Individual Activation Mode, No Activation/Deactivation Delay
Between Regulators, EN1 and EN2 Pins Tied Together
CH1 500mV
CH2 500mV
M1.00ms
A CH3 1.16V
T 10.00%
CH3 2.00V
1
2
3
T
LDO OUTPUT
BUCK OUTPUT
EN1
Figure 76. Autosequence Mode Turn On Behavior, Buck Voltage = 1.8 V,
LDO Voltage = 1.2 V, Buck Load = 500 mA, LDO Load = 100 mA
CH1 500mV
CH2 500mV
M40.0祍
A CH3 1.16V
T 10.00%
CH3 2.00V
1
2
3
T
LDO OUTPUT
BUCK OUTPUT
EN1
Figure 77. Autosequence Mode Turn On Behavior, Buck Voltage = 1.8 V,
LDO Voltage = 1.2 V, Buck Load = 500 mA, LDO Load = 100 mA
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