參數(shù)資料
型號(hào)： LTC1735IS-1#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁(yè)數(shù)： 22/28頁(yè)
文件大小： 343K
代理商： LTC1735IS-1#TR
3
LTC1735-1
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:
f
kHz
CpF
I
OSC
CHG
DIS
()
.()
()
–
=
+
+
8 477 10
11
8
1
Note 7: Rise and fall times are measured using 10% to 90% levels.
Delay times are measured using 50% levels.
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 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)
INTVCC Load Regulation
ICC = 0mA 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
(Note 6), COSC = 43pF
265
300
335
kHz
fH/fOSC
Maximum Sync Frequency Ratio
1.3
PGOOD Pin
VPG(SYNC)
PGOOD Threshold for Sync
Ramping Negative
0.9
1.2
V
VPG(FC)
PGOOD Threshold for Force Cont.
0.76
0.8
0.84
V
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
110
200
mV
IPGOOD
PGOOD Pull-Up Current
VPGOOD = 0.85V
– 0.17
A
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
%
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