ADP1821
Rev. C | Page 3 of 24
SPECIFICATIONS
V
VCC
= V
PVCC
= V
SHDN
= V
FREQ
= 5 V, SYNC = GND. All limits at temperature extremes are guaranteed via correlation using standard
statistical quality control (SQC). T
J
= −40°C to +125°C, unless otherwise specified. Typical values are at T
A
=25°C.
Table 1.
Parameter Conditions Min Typ Max Unit
POWER SUPPLY
Input Voltage 3.7 5.5 V
Undervoltage Lockout Threshold V
VCC
rising, T
J
= −40°C to +125°C 2.4 2.7 3.0 V
Undervoltage Lockout Threshold V
VCC
rising, T
A
= 25°C 2.5 2.7 2.9 V
Undervoltage Lockout Hysteresis V
VCC
0.1 V
Quiescent Current I
VCC
+ I
VCC
, not switching 1 2 mA
Shutdown Current
SHDN = GND
10
A
Power Stage Supply Voltage 1.0 24 V
ERROR AMPLIFIER
FB Regulation Voltage T
J
= −40°C to +85°C 594 600 606 mV
FB Regulation Voltage T
J
= −40°C to +125°C 588 600 606 mV
FB Input Bias Current −100 +1 +100 nA
Error Amplifier Open-Loop Voltage Gain 70 dB
COMP Output Sink Current 600 A
COMP Output Source Current 110 A
COMP Clamp High Voltage 2.4 V
COMP Clamp Low Voltage 0.75 V
PWM CONTROLLER
PWM Peak Ramp Voltage 1.25 V
DL Minimum On Time FREQ = VCC (300 kHz) 120 170 220 ns
DL Minimum On-Time FREQ = VCC (300 kHz), T
A
= 25°C 140 170 200 ns
DH Maximum Duty Cycle FREQ = GND (300 kHz) 85 90 %
DH Minimum Duty Cycle FREQ = GND (300 kHz) 1 3 %
SOFT START
SS Pull-Up Resistance SS = GND 95 kΩ
SS Pull-Down Resistance V
SS
= 0.6 V 1.65 2.5 4.2 kΩ
OSCILLATOR
Oscillator Frequency FREQ = GND 250 310 375 kHz
FREQ = VCC 470 570 720 kHz
Synchronization Range FREQ = GND 300 600 kHz
FREQ = VCC 600 1200 kHz
SYNC Minimum Pulse Width 80 ns
CURRENT SENSE
CSL Threshold Voltage Relative to PGND −30 0 +30 mV
CSL Output Current V
CSL
= 0 V 42 50 54
μA
Current Sense Blanking Period 160 ns
GATE DRIVERS
DH Rise Time C
GATE
= 3 nF, V
DH
= V
IN
, V
BST
− V
SW
= 5 V 16 ns
DH Fall Time C
GATE
= 3 nF, V
DH
= V
IN
, V
BST
− V
SW
= 5 V 12 ns
DL Rise Time C
GATE
= 3 nF, V
DL
= V
IN
19 ns
DL Fall Time C
GATE
= 3 nF, V
DL
= 0 V 13 ns
DL Low to DH High Dead Time 33 ns
DH Low to DL High Dead Time 42 ns
