Datasheet

ADP2125
Rev. A | Page 3 of 16
SPECIFICATIONS
V
IN
= 3.6 V, V
OUT
= 1.26 V, T
A
= 25°C for typical specifications, and T
A
= T
J
= −40°C to +85°C for minimum and maximum specifications,
unless otherwise noted.
All specifications at temperature extremes are guaranteed via correlation using standard statistical quality control
(SQC) methods. Typical specifications are not guaranteed.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SUPPLY
Operating Input Voltage Range V
IN
2.1 5.5 V
Quiescent Current No load 8 mA
Shutdown Current V
EXTCLK
= 0 V, open-loop 0.3 1.5 µA
UNDERVOLTAGE LOCKOUT
Rising V
IN
Threshold 1.9 2.1 V
Falling V
IN
Threshold 1.5 1.8 V
OUTPUT
Continuous Output Current
1
I
LOAD
V
IN
= 2.1 V to 5.5 V 500 mA
Output Accuracy
2
V
OUT
V
IN
= 2.3 V to 4.8 V V
OUT
− 2% V
OUT
+ 2% V
FB Bias Current V
FB
= 1.2 V 4 9 µA
FB Pull-Down Resistance R
DSCHG
V
EXTCLK
= 0 V, I
FB
= 10 mA 110 180 Ω
SWITCHING CHARACTERISTICS
PMOS On Resistance 180 340 mΩ
NMOS On Resistance 250 mΩ
SW Leakage Current V
SW
= 0 V, V
IN
= 5.5 V 10 µA
PMOS Switch Current Limit Open-loop 770 1000 1291 mA
Oscillator Frequency f
SW
4.83 5.52 6 MHz
SHORT-CIRCUIT PROTECTION
Rising V
OUT
Threshold 0.55 0.7 V
Falling V
OUT
Threshold 0.4 0.52 V
EXTCLK INPUT
High Threshold Voltage V
EXTCLK(H)
V
IN
= 2.5 V to 4.4 V 1.4 V
Low Threshold Voltage V
EXTCLK(L)
V
IN
= 2.5 V to 4.4 V 0.5 V
Leakage Current V
IN
= 5.5 V, V
EXTCLK
= 2.1 V to 5.5 V 0.01 1 µA
Duty Cycle Operating Range D
EXTCLK
40 60 %
Frequency Operating Range f
EXTCLK
6 27 MHz
THERMAL SHUTDOWN
Thermal Shutdown Threshold 146 °C
Thermal Shutdown Hysteresis 13 °C
TIMING See Figure 2
VIN High to EXTCLK On
1
t
1
V
IN
= 2.1 V to 5.5 V 200 s
EXTCLK On to V
OUT
Rising t
2
D
EXTCLK
= 40% to 60%, f
EXTCLK
= 6 MHz 17 23 32 s
D
EXTCLK
= 40% to 60%, f
EXTCLK
= 27 MHz 16 21 28 s
V
OUT
Power-Up Time (Soft Start)
1
t
3
C
OUT
= 4.7 µF, R
LOAD
= 3.6 Ω 105 200 s
EXTCLK Off to V
OUT
Falling t
5
D
EXTCLK
= 40% to 60%, f
EXTCLK
= 6 MHz to 27 MHz 4.1 11 s
V
OUT
Power-Down Time t
6
C
OUT
= 4.7 µF, R
LOAD
= 3.6 Ω 36 s
C
OUT
= 4.7 µF, no load 1070 s
Minimum Shutdown Time
1
t
5
+ t
6
C
OUT
= 4.7 µF, no load 1400 s
Minimum Power-Off Time
1
t
7
500 s
1
Guaranteed by design.
2
Transients not included in voltage accuracy specifications.