ltc3890 Linear Technology Corporation, ltc3890 Datasheet - Page 4

• Manufacturer Part Number: ltc3890
• Description: 60v Low Iq, Dual, 2-phase Synchronous Step-down Dc/dc Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LTC3890
SYMBOL
INTV
V
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
f
f
f
PGOOD1 and PGOOD2 Outputs
V
I
V
t
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Ratings for extended periods may affect device reliability and
lifetime.
Note 2: The LTC3890E is guaranteed to meet performance specifi cations
from 0°C to 125°C. Specifi cations over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3890I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note 3: T
dissipation P
junction temperature range, otherwise specifi cations are at T
4
25kΩ
65kΩ
105kΩ
LOW
HIGH
SYNC
PGOOD
PG
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
T
CC
J
= T
Linear Regulator
J
A
is calculated from the ambient temperature T
+ (P
D
according to the following formula:
PARAMETER
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
D
• 34°C/W)
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
A
CONDITIONS
6V < V
I
6V < V
I
EXTV
R
R
R
V
V
PLLIN/MODE = External Clock
I
V
V
V
and power
CC
CC
PGOOD
FREQ
FREQ
PGOOD
FB
FB
FREQ
FREQ
FREQ
V
Hysteresis
V
Hysteresis
FB
FB
= 0mA to 50mA, V
= 0mA to 50mA, V
with Respect to Set Regulated Voltage
with Respect to Set Regulated Voltage
CC
Ramping Negative
Ramping Positive
= 0V, PLLIN/MODE = DC Voltage
= INTV
IN
EXTVCC
= 25k, PLLIN/MODE = DC Voltage
= 65k, PLLIN/MODE = DC Voltage
= 105k, PLLIN/MODE = DC Voltage
= 2mA
Ramping Positive
= 5V
< 60V, V
The
J
CC
< 13V
= 25°C. V
, PLLIN/MODE = DC Voltage
l
EXTVCC
denotes the specifi cations which apply over the full operating
EXTVCC
EXTVCC
Note 4: The LTC3890 is tested in a feedback loop that servos V
specifi ed voltage and measures the resultant V
85°C is not tested in production. This specifi cation is assured by design,
characterization and correlation to production testing at 125°C.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specifi ed for an inductor
peak-to-peak ripple current ≥ 40% of I
Considerations in the Applications Information section).
= 0V
IN
= 12V, V
= 0V
= 8.5V
RUN1,2
= 5V, EXTV
l
CC
4.85
4.85
MIN
375
320
485
–13
4.5
75
= 0V unless otherwise noted.
7
MAX
(See Minimum On-Time
FB1,2
TYP
250
105
440
835
350
535
–10
5.1
0.7
5.1
0.6
4.7
0.2
2.5
2.5
10
25
. The specifi cation at
MAX
5.35
5.35
505
380
585
850
1.1
1.1
4.9
0.4
±1
–7
13
ITH1,2
UNITS
to a
3890f
kHz
kHz
kHz
kHz
kHz
kHz
mV
μA
μs
%
%
%
%
%
%
V
V
V
V