ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 4

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LTC3869/LTC3869-2
SYMBOL
INTV
V
V
V
V
V
PGOOD Output
V
I
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
On Chip Driver
TG R
TG R
BG R
BG R
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 LTC3869 is tested under pulsed load conditions such that
T
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3869I is
guaranteed to meet performance specifications over the full –40°C to
125°C operating junction temperature range. The maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the package thermal
impedence and other environmental factors.
junction temperature range, otherwise specifications are at T
4
PGOOD
NOM
LOW
HIGH
FREQ
J
INTVCC
LDO
EXTVCC
LDOHYS
LDO
PGL
PG
MODE/PLLIN
≈ T
CC
UP
DOWN
UP
DOWN
INT
EXT
A
. The LTC3869E is guaranteed to meet performance specifications
Linear Regulator
PARAMETER
Internal V
INTV
EXTV
EXTV
EXTV
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
Nominal Frequency
Lowest Frequency
Highest Frequency
MODE/PLLIN Input Resistance
Frequency Setting Current
TG Pull-Up R
TG Pull-Down R
BG Pull-Up R
BG Pull-Down R
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Hysteresis
Voltage Drop
CC
Voltage
DS(ON)
DS(ON)
DS(ON)
DS(ON)
CONDITIONS
6V < V
I
EXTV
I
I
V
V
V
V
V
TG High
TG Low
BG High
BG Low
CC
CC
PGOOD
PGOOD
FB
FREQ
FREQ
FREQ
= 0mA to 20mA
= 20mA, V
V
V
with Respect to Set Output Voltage
FB
FB
CC
= 1.2V
= 0V
≥ 2.4V
IN
= 2mA
Ramping Negative
Ramping Positive
Ramping Positive
= 5V
< 38V
The
EXTVCC
A
= 25°C (Note 2). V
l
= 5V
denotes the specifications which apply over the full operating
Note 3: T
dissipation P
Note 4: The LTC3869 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 Applications Information.
Note 6: Delay times are measured using 50% levels.
Note 7: 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 8: Guaranteed by design.
LTC3869UFD: T
LTC3869GN-2: T
J
is calculated from the ambient temperature T
IN
D
according to the following formulas:
= 15V, V
J
J
= T
= T
A
A
RUN1,2
+ (P
+ (P
l
D
D
• 34°C/W)
• 80°C/W)
= 5V unless otherwise noted.
MIN
450
210
700
4.8
4.5
MAX
9
(see Minimum On-Time
FB1,2
TYP
200
–10
500
250
780
250
0.5
4.7
0.1
2.6
1.5
2.4
1.1
50
10
10
5
.
A
and power
MAX
100
550
290
850
5.2
0.3
±2
11
2
ITH1,2
UNITS
to a
3869f
kHz
kHz
kHz
mV
mV
kΩ
µA
µA
%
%
%
Ω
Ω
Ω
Ω
V
V
V