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ADP2140 Datasheet(PDF) 22 Page - Analog Devices

Part # ADP2140
Description  3 MHz, 600 mA, Low Quiescent Current Buck with 300 mA LDO Regulator
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP2140 Datasheet(HTML) 22 Page - Analog Devices

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ADP2140
Data Sheet
Rev. B | Page 22 of 32
EN1
VBUCK
EN2 = UNCONNECTED
VLDO
PG
92% VBUCK
85% VLDO
92% VLDO
tSS
tSS
tSTART
tRESET
tREG12
TIME
V
Figure 71. Autosequencing Mode, Buck First Then LDO
EN1
VBUCK
VLDO
PG
85% VBUCK
tSS
tREG12
TIME
V
EN2 = UNCONNECTED
tSTART
92% VLDO
92% VBUCK
tSS
tRESET
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, VBUCK 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
VBUCK
VLDO
PG
92% VLDO
tRESET
tRESET
92% VBUCK
85% VBUCK
95%
VBUCK
85%
VBUCK
85% VLDO
Figure 73. Individual Activation Mode, Both Regulators Sensed
EN2
EN1
VBUCK
VLDO
PG
92% VLDO
tRESET
92% VBUCK
85% VBUCK
85% VLDO
Figure 74. Individual Activation Mode, One Regulator Only (Buck) Sensed
tRESET
92% VBUCK
92% VLDO
85% VBUCK
85% VLDO
EN1
EN2
PG
VLDO
VBUCK
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
M40.0µs
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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