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ADP1621ARMZ Datenblatt(PDF) 3 Page - Analog Devices

Teilenummer ADP1621ARMZ
Bauteilbeschribung  Constant-Frequency, Current-Mode Step-Up DC/DC Controller
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ADP1621
Rev. A | Page 3 of 32
SPECIFICATIONS
VIN = 5 V, RFREQ = 100 kΩ, fOSC = 200 kHz, TJ = −40°C to 125°C, unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
MAIN CONTROL LOOP
Internal Soft Start Time
tSS
2048
Cycles
PIN Supply Voltage1
VPIN
2.9
VSHUNT
V
IN Supply Voltage1
VIN
2.9
VSHUNT
V
Shunt Regulation Voltage
VSHUNT
IIN = 3 mA, IPIN = 3 mA, TA = 25°C
5.4
5.6
5.7
V
IIN = 3 mA, IPIN = 3 mA
5.2
5.6
6.0
V
Shunt Resistance
RSHUNT
Current into IN = 8 mA to 12 mA
13
Ω
Current into PIN = 8 mA to 12 mA
7
Ω
IN Quiescent Current
IIN
VIN = 2.9 V to 5.5 V, VFB = 1.215 V
1.8
3
mA
IN Shutdown Current
VIN = 2.9 V to 5.5 V, SDSN = GND
1
10
μA
PIN Supply Current
IPIN
Static Mode, No Switching
VFB = 1.3 V, VCOMP < VCOMP,ZCT, GATE = 0 V
1
10
μA
Shutdown Mode
SDSN = GND
1
10
μA
VUVLO
VUVLO rising
2.2
2.5
2.8
V
Undervoltage Lockout Threshold at
IN Pin
VUVLO hysteresis
−80
mV
FB Regulation Voltage
VFB
TA = 25°C
1.203
1.215
1.227
V
1.197
1.215
1.233
V
FB Input Current
IFB
VFB = 1.215 V, TA = 25°C
−75
+25
+75
nA
Line Regulation2
∆VFB/∆VIN
2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +85°C
0.02
0.06
%/V
2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +125°C
0.02
0.072
%/V
Load Regulation3
∆VFB/∆VCOMP
VCOMP = 1.4 V to 1.5 V
−1
−0.1
%
Error Amplifier Transconductance
gm
300
μS
COMP Zero-Current Threshold
VCOMP,ZCT
0.85
1.0
1.15
V
COMP Clamp High Voltage
VCOMP,CLAMP
TJ = −40°C to +85°C
1.9
2.0
2.1
V
TJ = −40°C to +125°C
1.9
2.0
2.2
V
Current-Sense Amplifier Gain
n
7.5
9.5
11.5
V/V
Peak Slope-Compensation Current at
CS Pin4
ISC,PK
VCS = 0 V to 100 mV maximum
across RS (GATE high)
55
70
85
μA
CS Pin Leakage Current
ICS,LEAK
VCS = 30 V (GATE low)
5
μA
Shutdown Time
tSD
SDSN pin from high to low or left floating
50
μs
Thermal Shutdown Threshold5
TTMSD
150
°C
Thermal Shutdown Hysteresis5
−10
°C
OSCILLATOR
Oscillator Frequency Range6
fOSC
100
1500
kHz
Oscillator Frequency
fOSC
RFREQ = 65 kΩ, TA = 25°C
255
325
395
kHz
Oscillator Frequency Tempco
fOSC,TC
±0.06
%/°C
SDSN Input Level Threshold
VSDSN,THRESH
VIN = VPIN = 5 V
1.5
1.7
1.9
V
SDSN Threshold Hysteresis
−0.19
V
SDSN Internal Pull-Down Resistor
RSDSN
100
Synchronization Minimum Pulse Width
tSYNC,MIN
VSDSN = 0 V to VIN
45
100
ns
Synchronization Maximum Pulse Width
tSYNC,MAX
VSDSN = 0 V to VIN
0.8/fSYNC
ns
Synchronization Frequency
fSYNC
110
1800
kHz
GATE Minimum On Time
tON,MIN
VFB = 1.215 V, VCOMP = 1.0 V
180
215
ns
GATE Minimum Off Time
tOFF,MIN
VFB = 1.215 V, VCOMP = 2.0 V
190
230
ns
Maximum Duty Cycle6, 7
DMAX
fSW = 200 kHz, RFREQ = 100 kΩ
93
97
%
Recommended Maximum
Synchronized Frequency Ratio6, 8
fSYNC/fOSC
fOSC = 200 kHz, RFREQ = 100 kΩ, fSYNC = fSW
1.1
1.2
1.4


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