LTC1735C-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
View to exact match
LTC1735C-1 Datasheet PDF : 28 Pages
| |||
LTC1735-1
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
TG tr
TG tf
BG tr
BG tf
TG/BG T1D
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
Top Gate Off to Synchronous
Gate-On Delay Time
(Note 7)
CLOAD = 3300pF
CLOAD = 3300pF
(Note 7)
CLOAD = 3300pF
CLOAD = 3300pF
CLOAD = 3300pF Each Driver
50
90
ns
50
90
ns
50
90
ns
40
80
ns
100
ns
TG/BG T2D
Synchronous Gate Off to Top
Gate-On Delay Time
CLOAD = 3300pF Each Driver
70
ns
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
VLDO(INT)
INTVCC Load Regulation
VLDO(EXT)
EXTVCC Drop Voltage
VEXTVCC
EXTVCC Switchover Voltage
VEXTVCC(HYS) EXTVCC Hysteresis
Oscillator
6V < VIN < 30V, VEXTVCC = 4V
ICC = 0mA to 20mA, VEXTVCC = 4V
ICC = 20mA, VEXTVCC = 5V
ICC = 20mA, EXTVCC Ramping Positive
5.0
5.2
5.4
V
0.2
1
%
130 200
mV
q 4.5
4.7
V
0.2
V
fOSC
fH/fOSC
PGOOD Pin
Oscillator Frequency
Maximum Sync Frequency Ratio
(Note 6), COSC = 43pF
265 300 335
kHz
1.3
VPG(SYNC)
VPG(FC)
VPGL
IPGOOD
VPG
PGOOD Threshold for Sync
PGOOD Threshold for Force Cont.
PGOOD Voltage Low
PGOOD Pull-Up Current
PGOOD Trip Level
Ramping Negative
IPGOOD = 2mA
VPGOOD = 0.85V
VOSENSE With Respect to Set Output Voltage
VOSENSE Ramping Negative
VOSENSE Ramping Positive
0.9
1.2
V
0.76
0.8
0.84
V
110 200
mV
– 0.17
µA
– 6.0 –7.5 –9.5
%
6.0
7.5
9.5
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1735CS-1, LTC1735IS-1: TJ = TA + (PD • 110 °C/W)
LTC1735CGN-1, LTC1735IGN-1: TJ = TA + (PD • 130°C/W)
Note 3: The LTC1735-1 is tested in a feedback loop that servos VOSENSE
to the balance point for the error amplifier (VITH = 1.2V).
Note 4: The minimum on-time condition corresponds to an inductor
peak-to-peak ripple current > 40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Oscillator frequency is tested by measuring the COSC charge
current (IOSC) and applying the formula:
fOSC
(kHz)
=
8.477(108)
COSC(pF) + 11
1
ICHG
+
1
IDIS
–1
Note 7: Rise and fall times are measured using 10% to 90% levels.
Delay times are measured using 50% levels.
3
Share Link: 