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參數(shù)資料
| 型號(hào)： | LTC3835IUFD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 5 MM, PLASTIC, MO-220, QFN-20 |
| 文件頁(yè)數(shù)： | 25/30頁(yè) |
| 文件大小： | 1775K |
| 代理商： | LTC3835IUFD |
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LTC3835
4
3835fd
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 LTC3835E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3835I is guaranteed to meet
performance specifications over the full –40°C to 85°C operating
temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3835FE: TJ = TA + (PD 35°C/W)
LTC3835UFD: TJ = TA + (PD 37°C/W)
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted.
Note 4: The LTC3835 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB.
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).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF
70
ns
BG/TG t2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF
70
ns
tON(MIN)
Minimum On-Time
(Note 7)
180
ns
INTVCC Linear Regulator
VINTVCCVIN
Internal VCC Voltage
8.5V < VIN < 30V, VEXTVCC = 0V
5
5.25
5.5
V
VLDOVIN
INTVCC Load Regulation
ICC = 0mA to 20mA, VEXTVCC = 0V
0.2
1.0
%
VINTVCCEXT
Internal VCC Voltage
VEXTVCC = 8.5V
7.2
7.5
7.8
V
VLDOEXT
INTVCC Load Regulation
ICC = 0mA to 20mA, VEXTVCC = 8.5V
0.2
1.0
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
4.5
4.7
V
VLDOHYS
EXTVCC Hysteresis
0.2
V
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
VPLLLPF = No Connect
360
400
440
kHz
fLOW
Lowest Frequency
VPLLLPF = 0V
220
250
280
kHz
fHIGH
Highest Frequency
VPLLLPF = INTVCC
475
530
580
kHz
fSYNCMIN
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V
115
140
kHz
fSYNCMAX
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V
650
800
kHz
IPLLLPF
Phase Detector Output Current
Sinking Capability
Sourcing Capability
fPLLIN/MODE < fOSC
fPLLIN/MODE > fOSC
–5
5
A
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
A
VPG
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
VFB Ramping Positive
–12
8
–10
10
–8
12
%
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