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LTC1735CS 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1735CS
功能描述  High Efficiency Synchronous Step-Down Switching Regulator
PDF  32 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1735CS 数据表(HTML) 3 Page - Linear Technology

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LTC1735
1735fc
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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.
VOVL
Feedback Overvoltage Lockout
q
0.84
0.86
0.88
V
IQ
Input DC Supply Current
(Note 4)
Normal Mode
450
µA
Shutdown
VRUN/SS = 0V
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,
0.5
2
4
µA
VRUN/SS = 4.5V
UVLO
Undervoltage Lockout
Measured at VIN Pin (VIN Ramping Down)
q
3.5
3.9
V
∆VSENSE(MAX)
Maximum Current Sense Threshold
VOSENSE = 0.7V
q
60
75
85
mV
ISENSE
Sense Pins Total Source Current
VSENSE– = VSENSE+ = 0V
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
CLOAD = 3300pF
50
90
ns
TG tf
Fall Time
CLOAD = 3300pF
50
90
ns
BG Transition Time:
(Note 7)
BG tr
Rise Time
CLOAD = 3300pF
50
90
ns
BG tf
Fall Time
CLOAD = 3300pF
40
80
ns
TG/BG t1D
Top Gate Off to Synchronous
CLOAD = 3300pF Each Driver
100
ns
Gate On Delay Time
TG/BG t2D
Synchronous Gate Off to Top
CLOAD = 3300pF Each Driver
70
ns
Gate On Delay Time
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 30V, VEXTVCC = 4V
5.0
5.2
5.4
V
VLDO(INT)
Internal VCC Load Regulation
ICC = 0 to 20mA, VEXTVCC = 4V
0.2
1
%
VLDO(EXT)
EXTVCC Drop Voltage
ICC = 20mA, VEXTVCC = 5V
130
200
mV
VEXTVCC
EXTVCC Switchover Voltage
ICC = 20mA, EXTVCC Ramping Positive
q
4.5
4.7
V
VEXTVCC(HYS)
EXTVCC Hysteresis
0.2
V
Oscillator
fOSC
Oscillator Frequency
COSC = 43pF (Note 5)
265
300
335
kHz
fH/fOSC
Maximum Sync Frequency Ratio
1.3
fFCB(SYNC)
FCB Pin Threshold For Sync
Ramping Negative
0.9
1.2
V
PGOOD Output (LTC1735F Only)
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
110
200
mV
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
µA
VPG
PGOOD Trip Level
VOSENSE with Respect to Set Output Voltage
VOSENSE Ramping Negative
– 6.0
– 7.5
– 9.5
%
VOSENSE Ramping Positive
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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