LTC3785 LINER [Linear Technology], LTC3785 Datasheet - Page 4

• Manufacturer Part Number: LTC3785
• Description: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
• Manufacturer: LINER [Linear Technology]

LTC3789
elecTrical characTerisTics
SYMBOL
INTV
V
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
f
R
I
PGOOD Output
V
I
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3789 is tested under pulse load conditions such that
T
from 0°C to 85°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3789I is guaranteed to meet performance specifications over the
full –40°C to 125°C operating junction temperature range.
4
junction temperature range, otherwise specifications are at T
NOM
LOW
HIGH
SYNC
FREQ
PGOOD
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
J
MODE/PLLIN
≈ T
CC
A
. The LTC3789E is guaranteed to meet performance specifications
Linear Regulator
PARAMETER
Internal V
INTV
Internal V
INTV
EXTV
EXTV
Nominal Frequency
Low Fixed Frequency
High Fixed Frequency
Synchronizable Frequency
MODE/PLLIN Input Resistance
Frequency Setting Current
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
CONDITIONS
6.5V < V
I
6.5V < V
I
I
V
V
V
MODE/PLLIN = External Clock
I
V
V
CC
CC
CC
PGOOD
FREQ
FREQ
FREQ
PGOOD
FB
V
V
FB
FB
= 0mA to 20mA, V
= 0mA to 20mA, V
= 0mA to 20mA, EXTV
with Respect to Set Output Voltage
Ramping Negative
Ramping Positive
= 1.2V, R
= 0V
= 2.4V
= 2mA
= 5V
IN
EXTVCC
< 40V, V
The
A
FREQ
< 14V
l
= 25°C (Note 2). V
denotes the specifications which apply over the full operating
EXTVCC
= 1.22k
EXTVCC
EXTVCC
Note 3: T
dissipation P
Note 4: The LTC3789 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See the Applications Information
section.
CC
= 0V
LTC3789GN: T
LTC3789UFD: T
Ramping Positive
= 0V
= 12V
J
is calculated from the ambient temperature T
D
IN
according to the following formula:
= 15V, V
J
J
= T
= T
A
A
+ (P
RUN
+ (P
D
= 5V, unless otherwise noted.
D
• 80°C/W)
• 34°C/W)
l
MIN
350
175
570
200
5.2
5.2
4.7
8
FB
.
0.25
TYP
400
200
640
220
–10
5.5
0.2
5.5
0.2
4.8
0.1
10
10
A
and power
MAX
440
225
710
600
5.8
1.0
5.8
1.0
0.3
12
±1
ITH
to a
UNITS
3789f
kHz
kHz
kHz
kHz
kΩ
µA
µA
%
%
%
%
V
V
V
V
V