LTC1735CS Просмотр технического описания (PDF) - Linear Technology
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LTC1735CS Datasheet PDF : 32 Pages
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LTC1735
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
VOVL
Feedback Overvoltage Lockout
q 0.84 0.86 0.88
V
IQ
Input DC Supply Current
Normal Mode
Shutdown
(Note 4)
VRUN/SS = 0V
450
µA
15
25
µA
VRUN/SS
Run Pin Start Threshold
VRUN/SS, Ramping Positive
1.0
1.5
1.9
V
VRUN/SS
Run Pin Begin Latchoff Threshold
VRUN/SS, Ramping Positive
4.1
4.5
V
IRUN/SS
Soft-Start Charge Current
VRUN/SS = 0V
– 0.7 – 1.2
µA
ISCL
RUN/SS Discharge Current
Soft Short Condition, VOSENSE = 0.5V,
VRUN/SS = 4.5V
0.5
2
4
µA
UVLO
Undervoltage Lockout
Measured at VIN Pin (VIN Ramping Down)
q
3.5
3.9
V
∆VSENSE(MAX) Maximum Current Sense Threshold
ISENSE
Sense Pins Total Source Current
VOSENSE = 0.7V
VSENSE– = VSENSE+ = 0V
q 60
75
85
mV
60
80
µA
tON(MIN)
Minimum On-Time
Tested with a Square Wave (Note 6)
160
200
ns
TG Transition Time:
(Note 7)
TG tr
Rise Time
TG tf
Fall Time
CLOAD = 3300pF
CLOAD = 3300pF
50
90
ns
50
90
ns
BG Transition Time:
BG tr
Rise Time
BG tf
Fall Time
(Note 7)
CLOAD = 3300pF
CLOAD = 3300pF
50
90
ns
40
80
ns
TG/BG t1D
Top Gate Off to Synchronous
Gate On Delay Time
CLOAD = 3300pF Each Driver
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)
Internal VCC Load Regulation
VLDO(EXT)
EXTVCC Drop Voltage
VEXTVCC
EXTVCC Switchover Voltage
VEXTVCC(HYS) EXTVCC Hysteresis
Oscillator
6V < VIN < 30V, VEXTVCC = 4V
ICC = 0 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
Oscillator Frequency
fH/fOSC
Maximum Sync Frequency Ratio
fFCB(SYNC)
FCB Pin Threshold For Sync
PGOOD Output (LTC1735F Only)
COSC = 43pF (Note 5)
Ramping Negative
265
300
335
kHz
1.3
0.9
1.2
V
VPGL
IPGOOD
VPG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
IPGOOD = 2mA
VPGOOD = 5V
VOSENSE with Respect to Set Output Voltage
VOSENSE Ramping Negative
VOSENSE Ramping Positive
110
200
mV
±1
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 a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1735CS, LTC1735IS: TJ = TA + (PD • 110 °C/W)
LTC1735CGN, LTC1735IGN, LTC1735EGN: TJ = TA + (PD • 130°C/W)
LTC1735CF, LTC1735IF: TJ = TA + (PD • 110°C/W)
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