Datasheet

LTC3866
4
3866fb
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
TG/BG t
D
Top Gate Off to Bottom Gate
On Delay, Synchronous
Switch-On Delay Time
C
LOAD
= 3300pF 30 ns
BG/TG t
D
Bottom Gate Off to Top Gate
On Delay, Top Switch-On
Delay Time
C
LOAD
= 3300pF 30 ns
t
ON(MIN)
Minimum On-Time (Note 8) 90 ns
INTV
CC
Linear Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 38V 5.25 5.5 5.75 V
Load Regulation I
INTVCC
= 0mA to 20mA 0.5 2 %
V
EXTVCC
External V
CC
Switchover
Voltage
EXTV
CC
Ramping Positive 4.5 4.7 V
EXTV
CC
Voltage Drop I
EXTVCC
= 20mA, V
EXTVCC
= 5V 50 100 mV
EXTV
CC
Hysteresis 200 mV
Oscillator and Phase-Locked Loop
f
NOM
Nominal Frequency V
FREQ
= 1.2V 450 500 550 kHz
f
LOW
Lowest Frequency V
FREQ
= 0.4V 225 250 275 kHz
f
HIGH
Highest Frequency V
FREQ
> 2.4V 700 770 850 kHz
R
MODE/PLLIN
MODE/PLLIN Input Resistance 250 kΩ
I
FREQ
Frequency Setting Current 9 10 11 µA
CLKOUT Phase Relative to the
Oscillator Clock
180 Deg
CLKOUT
HI
Clock Output High Voltage V
INTVCC
= 5.5V 4.5 5.5 V
CLKOUT
LO
Clock Output Low Voltage 0 0.2 V
PGOOD Output
V
PGDLO
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGD
PGOOD Leakage Current V
PGOOD
= 5.5V 2 µA
V
PGD
PGOOD Trip V
FB
with Respect to Set Output Voltage
V
FB
Going Negative
V
FB
Going Positive
–10
10
%
%
Differential Amplifier
A
V
Gain –40°C to 85°C
–40°C to 125°C
l
l
0.999
0.998
1
1
1.001
1.002
V/V
V/V
R
IN
Input Resistance Measured at DIFFP Input 80 kΩ
V
OS
Input Offset Voltage V
DIFFP
= 1.5V, V
DIFFOUT
= 100µA 2 mV
PSRR Power Supply Rejection Ratio 5V < V
IN
< 38V 90 dB
I
OUT
Maximum Sourcing Output
Current
1.5 3 mA
V
OUT
Maximum Output Voltage V
INTVCC
= 5.5V, I
DIFFOUT
= 300µA V
INTVCC
– 1.4 V
INTVCC
– 1.1 V
GBW Gain-Bandwidth Product (Note 9) 3 MHz
SR Slew Rate (Note 9) 2 V/µs