Datasheet

ADP1851 Data Sheet
Rev. 0 | Page 4 of 24
SPECIFICATIONS
All limits at temperature extremes, T
JMIN
and T
JMAX
, are guaranteed via correlation using standard statistical quality control (SQC). V
IN
=
12 V. The specifications are valid for T
J
= −40°C to +125°C, unless otherwise specified. Typical values are at T
A
= 25°C.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
POWER SUPPLY
Input Voltage V
IN
2.75 20 V
Undervoltage Lockout Threshold UVLO
TRSH
V
IN
rising 2.55 2.65 2.75 V
V
IN
falling 2.35 2.45 2.50 V
Undervoltage Lockout Hysteresis UVLO
HYST
0.2 V
Quiescent Current
I
IN
EN = V
IN
= 12 V, V
COMP
= 0.6 V in forced pulse-
width modulation (PWM) mode (not
switching), SYNC = VCCO
4.2
5.7
mA
EN = V
IN
= 12 V, V
COMP
= 0.6 V in PSM mode,
SYNC = AGND
2.5 mA
Shutdown Current I
IN_SD
EN = AGND, V
IN
= 5.5 V or 20 V 100 200 µA
ERROR AMPLIFIER
FB Input Bias Current I
FB
−100 +1 +100 nA
Open-Loop Gain
1
80 dB
Gain Bandwidth Product
1
20
MHz
CURRENT SENSE AMPLIFIER GAIN A
CS
Current sense gain resistor connected
between DL and PGND, R
CSG
= 47 kΩ ± 5%
2.6 3 3.4 V/V
Current sense gain resistor connected
between DL and PGND, R
CSG
= 22 kΩ ± 5%
5.2 6 6.8 V/V
Default setting, R
CSG
= open 10.5 12 13.5 V/V
Voltage mode operation, resistor connected
between DL and PGND, R
CSG
= 100 kΩ ± 5%
0 V/V
OUTPUT CHARACTERISTICS
Feedback Accuracy Voltage V
FB
T
J
= −40°C to +85°C
597 600 603 mV
T
J
= −40°C to +125°C
594 600 606 mV
Line Regulation of PWM ΔV
FB
/ΔV
IN
±0.015 %/V
Load Regulation of PWM
1
ΔV
FB
/ΔV
COMP
V
COMP
range = 0.9 V to 2.2 V ±0.3 %
OSCILLATOR
Frequency f
OSC
R
FREQ
= 332 kΩ to AGND 170 200 230 kHz
R
FREQ
= 78.7 kΩ to AGND 720 800 880 kHz
R
FREQ
= 40.2 kΩ to AGND 1275 1500 1725 kHz
FREQ connected to AGND
240
300
360
kHz
FREQ connected to VCCO 480 600 720 kHz
SYNC Input Frequency Range
1
f
SYNC
R
FREQ
range from 332 kΩ to 40.2 kΩ 170 1725 kHz
SYNC Input Pulse Width
1
t
SYNCMIN
100 ns
SYNC Pin Capacitance to AGND C
SYNC
5 pF
LINEAR REGULATOR
VCCO Output Voltage I
VCCO
= 100 mA 4.7 5.0 5.3 V
VCCO Load Regulation I
VCCO
= 0 mA to 100 mA 35 mV
VCCO Line Regulation V
IN
= 5.5 V to 20 V, I
VCCO
= 20 mA 10 mV
VCCO Current Limit
1
VCCO drops to 4 V from 5 V 350 mA
VCCO Short-Circuit Current
1
VCCO < 0.5 V 370 400 mA
VIN to VCCO Dropout Voltage
2
V
DROPOUT
I
VCCO
= 100 mA, V
IN
≤ 5 V 0.33 V
LOGIC INPUTS
EN Threshold Voltage EN rising 0.57 0.63 0.68 V
EN Hysteresis 0.03 V
EN Input Leakage Current I
EN
V
IN
= 2.75 V to 20 V 1 200 nA