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ADP1821 Datasheet(PDF) 3 Page - Analog Devices

Part No. ADP1821
Description  Step-Down DC-to-DC Controller
Download  24 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1821 Datasheet(HTML) 3 Page - Analog Devices

 
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ADP1821
Rev. B | Page 3 of 24
SPECIFICATIONS
VVCC = VPVCC = V
SHDN = VFREQ = 5 V, SYNC = GND. All limits at temperature extremes are guaranteed via correlation using standard
statistical quality control (SQC). TA = −40°C to +85°C, unless otherwise specified.
Table 1.
Parameter
Conditions
Min
Typ
Max
Unit
POWER SUPPLY
Input Voltage
3.0
5.5
V
Undervoltage Lockout Threshold
VVCC rising
2.5
2.7
2.9
V
Undervoltage Lockout Hysteresis
VVCC
0.1
V
Quiescent Current
IVCC + IVCC, not switching
1
2
mA
Shutdown Current
SHDN = GND
10
μA
Power Stage Supply Voltage
1.0
24
V
ERROR AMPLIFIER
FB Regulation Voltage
594
600
606
mV
FB Input Bias Current
–100
+1
+100
nA
Error Amplifier Open-Loop Voltage Gain
70
dB
COMP Output Sink Current
600
μA
COMP Output Source Current
110
μA
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)
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
SS Pull-Down Resistance
VSS = 0.6 V
1.65
2.5
4.2
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
VCSL = 0 V
42
50
54
μA
Current Sense Blanking Period
160
ns
GATE DRIVERS
DH Rise Time
CGATE = 3 nF, VDH = VIN, VBST − VSW = 5 V
16
ns
DH Fall Time
CGATE = 3 nF, VDH = VIN, VBST − VSW = 5 V
12
ns
DL Rise Time
CGATE = 3 nF, VDL = VIN
19
ns
DL Fall Time
CGATE = 3 nF, VDL = 0 V
13
ns
DL Low to DH High Dead Time
33
ns
DH Low to DL High Dead Time
42
ns
LOGIC THRESHOLDS (SHDN, SYNC, FREQ)
SHDN, SYNC, FREQ Input High Voltage
VVCC = 3.0 V to 5.5 V
2.0
V
SHDN, SYNC, FREQ Input Low Voltage
VVCC = 3.0 V to 5.5 V
0.8
V
SYNC, FREQ Input Leakage Current
SYNC = FREQ = GND
0.1
1
μA
SHDN Pull-Down Resistance
100


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