LTC3868IUH#TRPBF Linear Technology, LTC3868IUH#TRPBF Datasheet - Page 4

• Manufacturer Part Number: LTC3868IUH#TRPBF
• Description: IC CTRLR STP-DN SYNC DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3868IUH#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 14 V
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

ELECTRICAL CHARACTERISTICS
LTC3868
SYMBOL
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 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 LTC3868E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3868I is guaranteed over the full
–40°C to 85°C operating temperature range.
Note 3: T
dissipation P
temperature range, otherwise specifi cations are at T
4
ON(MIN)
105kΩ
LOW
HIGH
SYNC
PGOOD
PG
25kΩ
65kΩ
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
T
J
CC
= T
1D
1D
Linear Regulator
J
A
is calculated from the ambient temperature T
+ (P
D
according to the following formula:
PARAMETER
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 (PGOOD Low)
D
• 34°C/W)
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
A
and power
CONDITIONS
C
C
(Note 7)
6V < V
I
6V < V
I
EXTV
R
R
R
V
V
PLLIN/MODE = External Clock
I
V
V
V
CC
CC
PGOOD
A
LOAD
LOAD
FREQ
FREQ
PGOOD
FB
FB
FREQ
FREQ
FREQ
V
Hysteresis
V
Hysteresis
= 25°C. V
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
= 3300pF Each Driver
= 3300pF Each Driver
IN
EXTVCC
= 25k, PLLIN/MODE = DC Voltage
= 65k, PLLIN/MODE = DC Voltage
= 105k, PLLIN/MODE = DC Voltage
= 2mA
= 5V
The
Ramping Positive
< 24V, V
l
CC
IN
< 13V
denotes the specifi cations which apply over the full operating
, PLLIN/MODE = DC Voltage
= 12V, V
EXTVCC
Note 4: The LTC3868 is tested in a feedback loop that servos V
specifi ed 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: 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).
EXTVCC
EXTVCC
= 0V
RUN1,2
= 0V
= 8.5V
= 5V, EXTV
CC
= 0V unless otherwise noted.
l
4.85
4.85
MIN
375
320
485
–13
MAX
4.5
75
7
(See Minimum On-Time
FB1,2
TYP
250
440
835
350
535
105
–10
0.7
0.6
0.2
2.5
2.5
5.1
5.1
4.7
30
30
95
10
25
.
MAX
5.35
5.35
505
380
585
850
4.9
0.4
1.1
1.1
±1
–7
13
ITH1,2
UNITS
to a
3868fd
kHz
kHz
kHz
kHz
kHz
kHz
mV
μA
ns
ns
ns
μs
%
%
%
%
%
%
V
V
V
V