Analog Devices ADP1879 Evaluation Board ADP1879-1.0-EVALZ ADP1879-1.0-EVALZ Hoja De Datos
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ADP1879-1.0-EVALZ
Data
Sheet
ADP1878/ADP1879
Rev. B | 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 − V
BST − SW = VREG − V
RECT_DROP
(see Figure 40 to Figure 42). VIN = 12 V. The specifications are valid for T
J
= −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
C
VIN
= 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
I
Q_REG
+
I
Q_BST
FB = 1.5 V, no switching
1.1
mA
Shutdown Current
I
REG,SD
+
I
BST,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
bias internal circuitry only
VREG Operational Output Voltage VREG
C
VREG
= 4.7 µF to PGND, 0.22 µF to GND, V
IN
= 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
V
IN
= 7 V, 100 mA
4.82
4.981 5.16
V
V
IN
= 12 V, 100 mA
4.83
4.982 5.16
V
Load Regulation
0 mA to 100 mA, V
IN
= 7 V
32
mV
0 mA to 100 mA, V
IN
= 20 V
34
mV
Line Regulation
V
IN
= 7 V to 20 V, 20 mA
1.8
mV
V
IN
= 7 V to 20 V, 100 mA
2.0
mV
VIN to VREG Dropout Voltage
100 mA out of VREG, V
IN
≤ 5 V
306
415
mV
Short VREG to PGND
V
IN
= 20 V
229
320
mA
SOFT START
Connect external capacitor from SS pin to GND,
Soft Start Period Calculation
C
SS
= 10 nF/ms
10
nF/ms
ERROR AMPLIFER
FB Regulation Voltage
V
FB
T
J
= 25°C
600
mV
T
J
= −40°C to +85°C
596
600
604
mV
T
J
= −40°C to +125°C
594.2 600
605.8 mV
Transconductance
G
m
320
496
670
µS
FB Input Leakage Current
I
FB, 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 evaluation
bench evaluation
ADP1878ACPZ-0.3-R7/
ADP1879ACPZ-0.3-R7
300
kHz
On Time
V
IN
= 5 V, V
OUT
= 2 V, T
J
= 25°C
1120
1200
1345
ns
Minimum On Time
V
IN
= 20 V
145
190
ns
Minimum Off Time
84% duty cycle (maximum)
340
400
ns