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Si4842DY Datasheet(PDF) 3 Page - Analog Devices

No. de pieza Si4842DY
Descripción Electrónicos  Synchronous Buck Controller
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Si4842DY Datasheet(HTML) 3 Page - Analog Devices

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Data Sheet
ADP1878/ADP1879
Rev. A | Page 3 of 40
SPECIFICATIONS
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). VREG = 5 V,
BST − SW = VREG − VRECT_DROP (see Figure 40 to Figure 42). VIN = 12 V. The specifications are valid for TJ = −40°C to +125°C,
unless otherwise specified.
Table 1.
Parameter
Symbol
Test Conditions/Comments
Min
Typ
Max
Unit
POWER SUPPLY CHARACTERISTICS
High Input Voltage Range
VIN
CVIN = 22 μF(25 V rating) right at Pin 1 to PGND (Pin 11)
ADP1878ACPZ-0.3-R7/ADP1879ACPZ-0.3-R7 (300 kHz)
2.95
12
20
V
ADP1878ACPZ-0.6-R7/ADP1879ACPZ-0.6-R7 (600 kHz)
2.95
12
20
V
ADP1878ACPZ-1.0-R7/ADP1879ACPZ-1.0-R7 (1.0 MHz)
3.25
12
20
V
Quiescent Current
IQ_REG +
IQ_BST
FB = 1.5 V, no switching
1.1
mA
Shutdown Current
IREG,SD +
IBST,SD
EN < 600 mV
140
225
μA
Undervoltage Lockout
UVLO
Rising VIN (see Figure 35 for temperature variation)
2.65
V
UVLO Hysteresis
Falling VIN from operational state
178
mV
INTERNAL REGULATOR
CHARACTERISTICS
Do not load VREG externally because it is intended to
bias internal circuitry only
VREG Operational Output Voltage
VREG
CVREG = 4.7 μF to PGND, 0.22 μF to GND, VIN = 2.95 V to 20 V
ADP1878ACPZ-0.3-R7/ADP1879ACPZ-0.3-R7 (300 kHz)
2.75
5
5.5
V
ADP1878ACPZ-0.6-R7/ADP1879ACPZ-0.6-R7 (600 kHz)
2.75
5
5.5
V
ADP1878ACPZ-1.0-R7/ADP1879ACPZ-1.0-R7 (1.0 MHz)
3.05
5
5.5
V
VREG Output in Regulation
VIN = 7 V, 100 mA
4.82
4.981
5.16
V
VIN = 12 V, 100 mA
4.83
4.982
5.16
V
Load Regulation
0 mA to 100 mA, VIN = 7 V
32
mV
0 mA to 100 mA, VIN = 20 V
34
mV
Line Regulation
VIN = 7 V to 20 V, 20 mA
1.8
mV
VIN = 7 V to 20 V, 100 mA
2.0
mV
VIN to VREG Dropout Voltage
100 mA out of VREG, VIN ≤ 5 V
306
415
mV
Short VREG to PGND
VIN = 20 V
229
320
mA
SOFT START
Connect external capacitor from SS pin to GND,
Soft Start Period Calculation
CSS = 10 nF/ms
10
nF/ms
ERROR AMPLIFER
FB Regulation Voltage
VFB
TJ = 25°C
600
mV
TJ = −40°C to +85°C
596
600
604
mV
TJ = −40°C to +125°C
594.2
600
605.8
mV
Transconductance
Gm
320
496
670
μS
FB Input Leakage Current
IFB, LEAK
FB = 0.6 V, EN = VREG
1
50
nA
CURRENT SENSE AMPLIFIER GAIN
Programming Resistor (RES)
Value from RES to PGND
RES = 47 kΩ ± 1%
2.7
3
3.3
V/V
RES = 22 kΩ ± 1%
5.5
6
6.5
V/V
RES = none
11
12
13
V/V
RES = 100 kΩ ± 1%
22
24
26
V/V
SWITCHING FREQUENCY
Typical values measured at 50% time points with 0 nF at
DRVH and DRVL; maximum values are guaranteed by
bench evaluation1
ADP1878ACPZ-0.3-R7/
ADP1879ACPZ-0.3-R7
300
kHz
On Time
VIN = 5 V, VOUT = 2 V, TJ = 25°C
1120
1200
1345
ns
Minimum On Time
VIN = 20 V
145
190
ns
Minimum Off Time
84% duty cycle (maximum)
340
400
ns


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