Datasheet
Data Sheet ADP1877
Rev. D | Page 3 of 32
SPECIFICATIONS
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control. 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 14.5 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
Shutdown Current I
IN_SD
EN1 = EN2 = GND, V
IN
= 5.5 V or 14.5 V 100 200 µA
ERROR AMPLIFIER
FB Input Bias Current I
FB
−100 +1 +100 nA
Transconductance G
m
Sink or source 1 µA, T
A
= 25
o
C 440 550 660 µS
Sink or source 1 µA 385 550 715 µS
TRK1, TRK2 Input Bias Current I
TRK
0 V < V
TRK1/TRK2
< 1.5 V −100 +1 +100 nA
CURRENT SENSE AMPLIFIER GAIN A
CS
Gain resistor connected to DL,
R
CSG
= 47 kΩ ± 5%
2.4 3 3.6 V/V
Gain resistor connected to DL,
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 DL,
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
OSC
R
FREQ
= 340 kΩ to AGND 170 200 235 kHz
R
FREQ
= 78.7 kΩ to AGND 744 800 856 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
; f
SYNC
= f
OSC
; the minimum sync
frequency is 1 × the f
OSC
set by the resistor
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
T
A
= 25°C, I
VCCO
= 100 mA
4.8 5.0 5.18 V
T
J
= −40°C to +125°C
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 14.5 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