ADP1879 Analog Devices, ADP1879 Datasheet - Page 3

• Manufacturer Part Number: ADP1879
• Description: Synchronous Buck Controller with Constant On-Time and Valley Current Mode with Power Saving Mode
• Manufacturer: Analog Devices

Data Sheet
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)
ADP1878ARQZ-0.3-R7/
Value from RES to PGND
ADP1879ARQZ-0.3-R7
On Time
Minimum On Time
Minimum Off Time
RECT_DROP
(see Figure 40 to Figure 42). VIN = 12 V. The specifications are valid for T
Symbol
VIN
I
I
I
I
UVLO
VREG
V
G
I
REG,SD
BST,SD
Q_REG
Q_BST
FB, LEAK
FB
m
+
+
Test Conditions/Comments
C
ADP1878ARQZ-0.3-R7/ADP1879ARQZ-0.3-R7 (300 kHz)
ADP1878ARQZ-0.6-R7/ADP1879ARQZ-0.6-R7 (600 kHz)
ADP1878ARQZ-1.0-R7/ADP1879ARQZ-1.0-R7 (1.0 MHz)
FB = 1.5 V, no switching
EN < 600 mV
Rising VIN (see Figure 35 for temperature variation)
Falling VIN from operational state
Do not load VREG externally because it is intended to
bias internal circuitry only
C
ADP1878ARQZ-0.3-R7/ADP1879ARQZ-0.3-R7 (300 kHz)
ADP1878ARQZ-0.6-R7/ADP1879ARQZ-0.6-R7 (600 kHz)
ADP1878ARQZ-1.0-R7/ADP1879ARQZ-1.0-R7 (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
V
V
84% duty cycle (maximum)
J
J
J
VIN
VREG
IN
IN
IN
IN
IN
SS
IN
IN
= 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
= 5 V, V
= 20 V
= 10 nF/ms
= 22 µF(25 V rating) right at Pin 1 to PGND (Pin 11)
= 4.7 µF to PGND, 0.22 µF to GND, V
OUT
Rev. 0 | Page 3 of 40
= 2 V, T
1
IN
IN
= 7 V
= 20 V
J
= 25°C
IN
≤ 5 V
IN
= 2.95 V to 20 V
J
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
= −40°C to +125°C,
ADP1878/ADP1879
Typ
12
12
12
1.1
140
2.65
178
5
5
5
4.981
4.982
32
34
1.8
2.0
306
229
10
600
600
600
496
1
3
6
12
24
300
1200
145
340
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
1345
190
400
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