LTC3780EG Linear Technology, LTC3780EG Datasheet - Page 4

• Manufacturer Part Number: LTC3780EG
• Description: IC,SMPS CONTROLLER,CURRENT-MODE,CMOS,SSOP,24PIN,PLASTIC
• Manufacturer: Linear Technology

LTC3780
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
t
t
Internal V
V
∆V
V
∆V
∆V
Oscillator and Phase-Locked Loop
f
f
f
R
I
PGOOD Output
∆V
∆V
∆V
V
I
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
power dissipation P
Note 3: The IC is tested in a feedback loop that servos V
voltage and measures the resultant V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
4
ON(MIN,BOOST)
ON(MIN,BUCK)
NOM
LOW
HIGH
PLLLPF
PGOOD
INTVCC
EXTVCC
PGL
PLLIN
LDO(LOADREG)
EXTVCC(HYS)
EXTVCC
FBH
FBL
FB(HYST)
T
J
= T
J
A
CC
for the QFN package is calculated from the temperature T
+ (P
Regulator
D
• 34°C/W)
PARAMETER
Minimum On-Time for Main Switch in
Boost Operation
Minimum On-Time for Synchronous
Switch in Buck Operation
Internal V
Internal V
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
D
according to the following formula:
CC
CC
CC
Switchover Voltage
Switchover Hysteresis
Switch Drop Voltage
CC
CC
Voltage
Load Regulation
OSENSE
.
ITH
to a specified
A
= 25°C. V
CONDITIONS
Switch C (Note 6)
Switch B (Note 6)
7V < V
I
I
I
V
V
V
f
f
V
V
V
I
V
CC
CC
CC
PLLIN
PLLIN
PGOOD
PLLFLTR
PLLFLTR
PLLFLTR
OSENSE
OSENSE
OSENSE
PGOOD
The
= 0mA to 20mA, V
= 20mA, V
= 20mA, V
A
and
< f
> f
IN
= 2mA
●
= 5V
OSC
OSC
Rising
Falling
Returning
IN
< 30V, V
= 1.2V
= 0V
= 2.4V
indicates specifications which apply over the full operating
= 15V unless otherwise noted.
EXTVCC
EXTVCC
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition is specified for an inductor peak-
to-peak ripple current ≥ 40% of I
considerations in the Applications Information section).
Note 7: The LTC3780E is guaranteed to meet performance specifications
from 0°C to 85°C. Performance over the –40°C to 85°C operating
temperature range is assured by design, characterization and correlation
with statistical process controls. The LTC3780I is guaranteed and tested
over the – 40°C to 85°C operating temperature range.
EXTVCC
Rising
= 6V
EXTVCC
= 5V
= 5V
●
●
MAX
–5.5
MIN
260
170
340
5.7
5.4
5.5
(see minimum on-time
–7.5
TYP
200
180
200
150
300
200
400
–15
0.2
5.7
7.5
2.5
0.1
50
6
15
MAX
240
220
300
330
220
440
–10
6.3
0.3
10
±1
2
UNITS
3780f
kHz
kHz
kHz
mV
mV
kΩ
µA
µA
µA
ns
ns
%
%
%
%
V
V
V