Datasheet

LTC3867
4
3867f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 15V, V
RUN
= 5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PG1(HYST)
PGOOD Trip Level Hysteresis 2 %
V
PG2
PGOOD 2nd Trip Level—No Delay V
FB
with Respect to Set Output Voltage
V
FB
Ramping Up
V
FB
Ramping Down
17
–25
%
%
V
PG2(HYST)
PGOOD 2nd Trip Level Hysteresis 5 %
INTV
CC
Linear Regulator
V
INTVCC
Linear Regulator Voltage 6V < V
IN
< 38V 5.1 5.3 5.5 V
V
LDO
INT INTV
CC
Load Regulation I
CC
= 0mA to 20mA 0.5 2 %
V
EXTVCC
EXTV
CC
Switchover Voltage EXTV
CC
Ramping Positive 4.5 4.7 V
V
LDO
EXT EXTV
CC
Voltage Drop I
CC
= 20mA, V
EXTVCC
= 5V 50 70 mV
V
LDO(HYS)
EXTV
CC
Hysteresis 200 mV
Differential Amplifier
V
DA
DIFF
+
Accuracy Measured in a Servo Loop with EA in Loop
I
TH
=1.2V, 0°C to 85°C
I
TH
=1.2V, –40°C to 125°C
l
595.5
594
600
600
604.5
606
mV
mV
I
DIFF
+ Input Bias Current DIFF
+
to SGND –200 200 nA
f
0dB
DA Unity-Gain Crossover Frequency (Note 7) 4 MHz
I
OUT(SINK)
Maximum Sinking Current DIFFOUT = 600mV 100 µA
I
OUT(SOURCE)
Maximum Sourcing Current DIFFOUT = 600mV 500 µA
Oscillator and Phase-Locked Loop
f
OSC
Oscillator Frequency R
FREQ
< 23.2kΩ
R
FREQ
= 30.1kΩ
R
FREQ
= 47.5kΩ
R
FREQ
= 54.9kΩ
R
FREQ
= 75.0kΩ
Maximum Frequency
Minimum Frequency
1.2
150
250
600
750
1.05
0.2
kHz
kHz
kHz
kHz
MHz
MHz
MHz
I
FREQ
FREQ Pin Output Current V
FREQ
= 0.8V 19 20 21 µA
R
MODE/PLLIN
MODE/PLLIN Input Resistance 250
On-Chip Driver
TG R
UP
TG Pull-Up R
DS(ON)
TG High 2.6 Ω
TG R
DOWN
TG Pull-Down R
DS(ON)
TG Low 1.5 Ω
BG R
UP
BG Pull-Up R
DS(ON)
BG High 2.4 Ω
BG R
DOWN
BG Pull-Down R
DS(ON)
BG Low 1.1 Ω