Datasheet

Data Sheet ADP1850
Rev. A | Page 3 of 32
SPECIFICATIONS
All limits at temperature extremes 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 Conditions Min Typ Max Unit
POWER SUPPLY
Input Voltage V
IN
2.75 20 V
Undervoltage Lockout Threshold IN
UVLO
V
IN
rising 2.45 2.6 2.75 V
V
IN
falling 2.4 2.5 2.6
Undervoltage Lockout Hysteresis 0.1 V
Quiescent Current I
IN
EN1 = EN2 = V
IN
= 12 V, V
FB
= V
CCO
in PWM mode
(no switching)
4.5 5.8
mA
EN1 = EN2 = V
IN
= 12 V, V
FB
= V
CCO
in PSM mode 2.8
mA
Shutdown Current I
IN_SD
EN1 = EN2 = GND, V
IN
= 5.5 V or 20 V 100 200
µA
ERROR AMPLIFIER
FBx Input Bias Current I
FB
−100 +1 +100 nA
Transconductance G
m
Sink or source 1 µA 385 550 715 µS
TRK1, TRK2 Input Bias Current I
TRK
0 V ≤ V
TRK1
/V
TRK2
≤ 5 V −100 +1 +100 nA
CURRENT SENSE AMPLIFIER GAIN A
CS
Gain resistor connected to DLx,
R
CSG
= 47 kΩ ± 5%
2.4 3 3.6 V/V
Gain resistor connected to DLx,
R
CSG
= 22 kΩ ± 5%
5.2 6 6.9 V/V
Default setting, R
CSG
= open 10.5 12 13.5 V/V
Gain resistor connected to DLx,
R
CSG
= 100 kΩ ± 5%
20.5 24 26.5 V/V
OUTPUT CHARACTERICTISTICS
Feedback Accuracy Voltage V
FB
T
J
= −40°C to +85°C, V
FB
= 0.6 V
−0.85% +0.6 +0.85% V
T
J
= −40°C to +125°C, V
FB
= 0.6 V
−1.5% +0.6 +1.5% V
Line Regulation of PWM ∆V
FB
/∆V
IN
±0.015 %/V
Load Regulation of PWM ∆V
FB
/∆V
COMP
V
COMP
range = 0.9 V to 2.2 V ±0.3 %
OSCILLATOR
Frequency f
SW
R
FREQ
= 340 kΩ to AGND 170 200 235 kHz
R
FREQ
= 78.7 kΩ to AGND 720 800 880 kHz
R
FREQ
= 39.2 kΩ to AGND 1275 1500 1725 kHz
FREQ to AGND 235 300 345 kHz
FREQ to VCCO 475 600 690 kHz
SYNC Input Frequency Range f
SYNC
f
SYNC
= 2 × f
SW
400 3000 kHz
SYNC Input Pulse Width t
SYNCMIN
100 ns
SYNC Pin Capacitance to GND 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
EN1, EN2 EN1/EN2 rising 0.57 0.63 0.68 V
EN1, EN2 Hysteresis 0.03 V
EN1, EN2 Input Leakage Current I
EN
V
IN
= 2.75 V to 20 V 1 200 nA
SYNC Logic Input Low 1.3 V
SYNC Logic Input High 1.9 V
SYNC Input Pull-Down Resistance R
SYNC
1 MΩ