3 MHz, 600 mA, Low Quiescent Current
Buck with 300 mA LDO Regulator
ADP2140
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUITS
VIN1 = 3.6V
100kΩ
CIN
10µF
+
10
9
PG
8
EN1
7
VOUT2 = 1.8V
COUT2
1µF
6
+
PG
PGND
SW
EN1
AGND
EN2
FB
VOUT2
VIN2
1
2
1µH
3
VOUT = 1.2V
+
4
COUT
10µF
5
07932-001
EN2
ADP2140
VIN1
Figure 1. ADP2140 with LDO Connected to VIN1
VIN1 = 3.3V
100kΩ
CIN
10µF
+
10
9
PG
8
EN1
EN2
7
VOUT2 = 1.2V
COUT2
1µF
6
+
ADP2140
VIN1
PG
PGND
SW
EN1
AGND
EN2
FB
VOUT2
VIN2
1
2
3
4
1µH
VOUT = 1.8V
+
COUT
10µF
5
07932-002
Input voltage range: 2.3 V to 5.5 V
LDO input (VIN2) 1.65 V to 5.5 V
Buck output voltage range: 1.0 V to 3.3 V
LDO output voltage range: 0.8 V to 3.3 V
Buck output current: 600 mA
LDO output current: 300 mA
LDO quiescent current: 22 μA with zero load
Buck quiescent current: 20 μA in PSM mode
Low shutdown current:
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