ADP1875 Analog Devices, ADP1875 Datasheet - Page 3

• Manufacturer Part Number: ADP1875
• Description: Synchronous Buck Controller with Constant On-Time, Valley Current Mode, and Power Saving Mode
• Manufacturer: Analog Devices

SPECIFICATIONS
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). VREG = 5 V,
BST − SW = VREG − V
unless otherwise specified.
Table 1.
Parameter
POWER SUPPLY CHARACTERISTICS
INTERNAL REGULATOR
SOFT START
ERROR AMPLIFER
CURRENT-SENSE AMPLIFIER GAIN
SWITCHING FREQUENCY
High Input Voltage Range
Quiescent Current
Shutdown Current
Undervoltage Lockout
UVLO Hysteresis
CHARACTERISTICS
VREG Operational Output Voltage
VREG Output in Regulation
Load Regulation
Line Regulation
VIN to VREG Dropout Voltage
Short VREG to PGND
Soft Start Period Calculation
FB Regulation Voltage
Transconductance
FB Input Leakage Current
Programming Resistor (RES)
ADP1874ARQZ-0.3/
Value from RES to PGND
ADP1875ARQZ-0.3 (300 kHz)
On-Time
Minimum On-Time
Minimum Off-Time
RECT_DROP
(see Figure 40 to Figure 42). V
Symbol
VIN
I
I
UVLO
VREG
V
G
I
Q_REG
REG,SD
FB, LEAK
FB
m
+ I
+ I
BST,SD
Q_BST
Test Conditions/Comments
C
ADP1874ARQZ-0.3/ADP1875ARQZ-0.3 (300 kHz)
ADP1874ARQZ-0.6/ADP1875ARQZ-0.6 (600 kHz)
ADP1874ARQZ-1.0/ADP1875ARQZ-1.0 (1.0 MHz)
FB = 1.5 V, no switching
EN < 600 mV
Rising V
Falling V
VREG and VREG_IN tied together and should not be
loaded externally because they are intended to only
bias internal circuitry
C
ADP1874ARQZ-0.3/ADP1875ARQZ-0.3 (300 kHz)
ADP1874ARQZ-0.6/ADP1875ARQZ-0.6 (600 kHz)
ADP1874ARQZ-1.0/ADP1875ARQZ-1.0 (1.0 MHz)
V
V
0 mA to 100 mA, V
0 mA to 100 mA, V
V
V
100 mA out of VREG, V
V
Connect external capacitor from SS pin to GND,
C
T
T
T
FB = 0.6 V, EN = VREG
RES = 47 kΩ ± 1%
RES = 22 kΩ ± 1%
RES = none
RES = 100 kΩ ± 1%
Typical values measured at 50% time points with
0 nF at DRVH and DRVL; maximum values are
guaranteed by bench evaluation
VIN = 5 V, V
VIN = 20 V
84% duty cycle (maximum)
J
J
J
VIN
VREG
IN
IN
IN
IN
IN
SS
= 25°C
= −40°C to +85°C
= −40°C to +125°C
= 7 V, 100 mA
= 12 V, 100 mA
= 7 V to 20 V, 20 mA
= 7 V to 20 V, 100 mA
= 20 V
= 10 nF/ms
= 22 μF(25 V rating) to PGND (at Pin 1)
= 4.7 μF to PGND, 0.22 μF to GND, V
IN
IN
Rev. 0 | Page 3 of 44
(see Figure 35 for temperature variation)
from operational state
OUT
IN
= 12 V. The specifications are valid for T
= 2 V, T
IN
IN
= 7 V
= 20 V
J
IN
= 25°C
≤ 5 V
1
IN
= 2.95 V to 20 V
J
= −40°C to +125°C,
Min
2.95
2.95
3.25
2.75
2.75
3.05
4.82
4.83
596
594.2
320
2.7
5.5
11
22
1120
ADP1874/ADP1875
Typ
12
12
12
140
2.65
190
5
5
5
4.981
4.982
32
34
2.5
2
300
229
10
600
600
600
496
1
3
6
12
24
300
1200
145
340
1.1
1280
400
Max
20
20
20
225
5.5
5.5
5.5
5.16
5.16
415
320
604
605.8
670
50
3.3
6.5
13
26
190
Unit
V
V
V
mA
μA
V
mV
V
V
V
V
V
mV
mV
mV
mV
mV
mA
nF/ms
mV
mV
mV
μS
nA
V/V
V/V
V/V
V/V
kHz
ns
ns
ns