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LTC3865EUHPBF Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3865EUHPBF
Description  Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3865EUHPBF Datasheet(HTML) 5 Page - Linear Technology

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LTC3865/LTC3865-1

3865f
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 LTC3865E/LTC3865E-1 are guaranteed to meet performance
specifications over the 0°C to 85°C operating junction temperature range.
Specifications over the –40°C to 85°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 specifications over the full –40°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3865UH: TJ = TA + (PD • 34°C/W)
LTC3865FE: TJ = TA + (PD • 25°C/W)
Note 4: The LTC3865/LTC3865-1 are tested in a feedback loop that servos
VITH1,2 to a specified voltage and measures the resultant VOSENSE1,2.
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 specified for an inductor peak-
to-peak ripple current 40% of IMAX (see Minimum On-Time Considerations
in the Applications Information section).
Note 8: VSENSE(MAX) defaults to 50mV for the LTC3865-1.
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
BG RDOWN
BG Driver Pull-Down On-Resistance
BG Low
1.4
Ω
TG1,2 tr
TG1,2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
ns
ns
BG1,2 tr
BG1,2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
ns
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
BG/TG t2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
tON(MIN)
Minimum On-Time
(Note 7)
90
ns
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 38V
4.8
5.0
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 20mA
0.5
2
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
l
4.5
4.7
V
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V
50
100
mV
VLDOHYS
EXTVCC Hysteresis
200
mV
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
RFREQ = 162k
450
500
550
kHz
fLOW
Lowest Frequency
RFREQ = 0Ω
210
250
290
kHz
fHIGH
Highest Frequency
RFREQ ≥ 325k
650
770
880
kHz
RMODE/PLLIN MODE/PLLIN Input Resistance
250
kΩ
IFREQ
Frequency Setting Current
6.5
7.5
8.5
µA
PGOOD OUTPUT
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±2
µA
VPG
PGOOD Trip Level
VOSENSE with Respect to Set Regulated Voltage
VID11 = VID12 = VID21 = VID22 = Float
VOSENSE Ramping Negative
VOSENSE Ramping Postitive
–7
7
–10
10
–12.5
12.5
%
%
tPG
PGOOD Bad Blanking Time
Measured from VID Transitition Edge
100
µs


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