LTC3865EFE#PBF Linear Technology, LTC3865EFE#PBF Datasheet - Page 5

• Manufacturer Part Number: LTC3865EFE#PBF
• Description: IC BUCK SYNC ADJ DUAL 38TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3865EFE#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.6 ~ 5 V
• Frequency - Switching: 250kHz ~ 770kHz
• Voltage - Input: 4.5 ~ 38 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
• Primary Input Voltage: 15V
• No. Of Outputs: 2
• Output Voltage: 5V
• Output Current: 25A
• No. Of Pins: 38
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

ELECTRICAL CHARACTERISTICS
SYMBOL
BG R
TG1,2 t
TG1,2 t
BG1,2 t
BG1,2 t
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
PGOOD OUTPUT
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 Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3865/LTC3865-1 are tested under pulsed load conditions
such that T
performance specifi cations over the 0°C to 85°C operating junction
temperature range. 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 LTC3865I/LTC3865I-1
are guaranteed to meet performance specifi cations over the full –40°C
to 125°C operating junction temperature range. Note that the maximum
ambient temperature consistent with these specifi cations is determined by
specifi c operating conditions in conjunction with board layout, the rated
package thermal resistance and other environmental factors.
junction temperature range, otherwise specifi cations are at T
ON(MIN)
NOM
LOW
HIGH
FREQ
PGOOD
PG
INTVCC
LDO
EXTVCC
LDO
LDOHYS
PGL
PG
MODE/PLLIN
CC
DOWN
INT
EXT
r
f
r
f
Linear Regulator
1D
2D
J
≈ T
PARAMETER
BG Driver Pull-Down On-Resistance
TG Transition Time:
BG Transition Time:
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
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
MODE/PLLIN Input Resistance
Frequency Setting Current
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
PGOOD Bad Blanking Time
A
Rise Time
Fall Time
Rise Time
Fall Time
. The LTC3865E/LTC3865E-1 are guaranteed to meet
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Voltage Drop
Hysteresis
CC
Voltage
CONDITIONS
BG Low
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
6V < V
I
EXTV
I
R
R
R
V
I
V
V
VID11 = VID12 = VID21 = VID22 = Float
Measured from VID Transitition Edge
CC
CC
PGOOD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
FREQ
FREQ
FREQ
FREQ
PGOOD
OSENSE
V
V
OSENSE
OSENSE
= 0mA to 20mA
= 20mA, V
CC
= 1.22V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
IN
= 162k
= 0Ω
≥ 325k
= 2mA
Ramping Positive
= 5V
with Respect to Set Regulated Voltage
< 38V
The
Ramping Negative
Ramping Postitive
A
EXTVCC
= 25°C (Note 2). V
l
denotes the specifi cations which apply over the full operating
= 5V
Note 3: T
dissipation P
Note 4: The LTC3865/LTC3865-1 are tested in a feedback loop that servos
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
in the Applications Information section).
Note 8: V
Note 9: Guaranteed by design.
ITH1,2
LTC3865UH: T
LTC3865FE: T
to a specifi ed voltage and measures the resultant V
J
SENSE(MAX)
is calculated from the ambient temperature T
D
IN
according to the following formulas:
= 15V, V
J
J
= T
= T
defaults to 50mV for the LTC3865-1.
A
LTC3865/LTC3865-1
A
+ (P
+ (P
RUN1,2
D
D
• 25°C/W)
• 34°C/W)
MAX
= 5V unless otherwise noted.
l
(see Minimum On-Time Considerations
MIN
450
210
650
4.8
4.5
6.5
–7
7
TYP
200
500
250
770
250
–10
100
1.4
5.0
0.5
4.7
7.5
0.1
25
25
25
25
30
30
90
50
10
A
and power
–12.5
OSENSE1,2
MAX
100
550
290
880
5.2
8.5
0.3
12.5
±2
2
.
UNITS
3865fb
5
kHz
kHz
kHz
mV
mV
kΩ
μA
μA
ns
ns
ns
ns
ns
ns
ns
μs
%
%
%
Ω
V
V
V