Datasheet

LTC3829
4
3829fa
For more information www.linear.com/LTC3829
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN
= 5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG1,2,3 t
r
TG1,2,3 t
f
TG Transition Time
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
25
25
ns
ns
BG1,2,3 t
r
BG1,2,3 t
f
BG Transition Time
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
25
25
ns
ns
TG/BG t
1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
C
LOAD
= 3300pF Each Driver 30 ns
BG/TG t
2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
C
LOAD
= 3300pF Each Driver 30 ns
t
ON(MIN)
Minimum On-Time (Note 7) 90 ns
INTV
CC
Linear Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
≤ 38V 4.8 5.0 5.2 V
V
LDO
INT INTV
CC
Load Regulation I
CC
= 0mA to 20mA 0.5 2.0 %
V
EXTVCC
EXTV
CC
Switchover Voltage EXTV
CC
Ramping Positive
l
4.5 4.7 V
V
LDO
EXT EXTV
CC
Voltage Drop I
CC
= 20mA, V
EXTVCC
= 5V 50 100 mV
V
LDOHYS
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
= 0V 210 250 290 kHz
f
HIGH
Highest Frequency V
FREQ
≥ 2.4V 700 770 850 kHz
R
PLLN
PLLIN Input Resistance 100 kΩ
I
FREQ
Frequency Setting Current 9 10 11 µA
I
ISET
Shed and Burst Mode Program
Current
6.5 7.5 8.5 µA
CLKOUT Phase (Relative to Controller 1) Non-Shedding Mode
Channel 2 and 3 Shedding
60
180
Deg
Deg
CLKHIGH Clock High Output Voltage 4 5 V
CLKLOW Clock Low Output Voltage 0 0.2 V
PGOOD Output
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V 0 ±2 µA
V
PG
PGOOD Trip Level, Either Controller V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
–12
8
–10
10
–7
13
%
%
Differential Amplifier
A
DA
Gain
l
0.997 1 1.003 V/V
R
IN
Input Resistance Measured at DIFFP Input 80 kΩ
V
OS
Input Offset Voltage V
DIFFP
= V
DIFFOUT
= 1.5V,
I
DIFFOUT
= 100µA
2.5 mV
PSRR Power Supply Rejection Ratio 5V < V
IN
< 38V 100 dB
I
CL
Maximum Output Current 3 mA
V
OUT(MAX)
Maximum Output Voltage INTV
CC
= 5V, I
DIFFOUT
= 300µA V
INTVCC
– 1.4 V
INTVCC
– 1.1 V
GBW Gain-Bandwidth Product (Note 8) 3 MHz
SR Slew Rate (Note 8) 2 V/µs