ltc3891 Linear Technology Corporation, ltc3891 Datasheet - Page 4

• Manufacturer Part Number: ltc3891
• Description: Ltc3891 - Low Iq, 60v Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3891
ELECTRICAL CHARACTERISTICS
SYMBOL
Gate Driver
TG
BG
TG t
TG t
BG t
BG t
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
f
f
f
PGOOD1 Output
V
I
V
t
4
temperature range, otherwise specifications are at T
ON(MIN)
25kΩ
65kΩ
105kΩ
LOW
HIGH
SYNC
PGOOD
PG
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
r
f
r
f
CC
Linear Regulator
1D
1D
PARAMETER
Pull-Up On-Resistance
Pull-Down On-Resistance
Pull-Up On-Resistance
Pull-Down On-Resistance
TG Transition Time:
BG Transition Time:
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
Internal V
INTV
Internal V
INTV
EXTV
EXTV
Programmable Frequency
Programmable Frequency
Programmable Frequency
Low Fixed Frequency
High Fixed Frequency
Synchronizable Frequency
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
Delay for Reporting a Fault
Rise Time
Fall Time
Rise Time
Fall Time
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
A
= 25°C (Note 2), V
CONDITIONS
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
6V < V
I
6V < V
I
V
I
EXTV
R
PLLIN/MODE = DC Voltage
R
PLLIN/MODE = DC Voltage
R
PLLIN/MODE = DC Voltage
V
PLLIN/MODE = DC Voltage
V
PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock
I
V
V
V
Hysteresis
V
Hysteresis
CC
CC
CC
PGOOD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
EXTVCC
FREQ
FREQ
PGOOD
FB
FB
FB
FREQ
FREQ
FREQ
= 0mA to 50mA, V
= 0mA to 50mA,
= 0mA to 50mA,
with Respect to Set Regulated Voltage
Ramping Negative
Ramping Positive
The
CC
= 0V;
= INTV
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF
IN
EXTVCC
= 25k;
= 65k;
=105k;
= 2mA
= 5V
Ramping Positive
= 8.5V
< 60V, V
l
denotes the specifications which apply over the full operating junction
CC
< 13V
;
EXTVCC
IN
EXTVCC
= 12V, V
= 0V
= 0V
RUN
= 5V, EXTV
l
CC
= 0V unless otherwise noted.
4.85
4.85
MIN
375
320
485
–13
4.5
75
7
TYP
250
105
440
835
350
535
–10
2.5
1.5
2.4
1.1
5.1
0.7
5.1
0.6
4.7
0.2
2.5
2.5
25
16
25
13
30
30
95
10
25
MAX
5.35
5.35
505
380
585
750
1.1
1.1
4.9
0.4
±1
–7
13
UNITS
3891f
kHz
kHz
kHz
kHz
kHz
kHz
mV
µA
ns
ns
ns
ns
ns
ns
ns
µs
%
%
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V