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LTC7802EUFDM 数据表(PDF) 4 Page - Analog Devices

部件名 LTC7802EUFDM
功能描述  40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum
PDF  34 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

LTC7802EUFDM 数据表(HTML) 4 Page - Analog Devices

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LTC7802
4
Rev. 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, RUN1,2 > 1.25V, EXTVCC = 0V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Gate Drivers
TG or BG On-Resistance
Pull-Up
Pull-Down
2.0
1.0
Ω
Ω
TG or BG Transition Time
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
15
ns
ns
TG Off to BG On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF Each Driver
15
ns
BG Off to TG On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
15
ns
tON(MIN)1,2
TG Minimum On-Time
(Note 7)
40
ns
Maximum Duty Factor for TG
fOSC = 350kHz
98
99
%
INTVCC Low Dropout (LDO) Linear Regulator
INTVCC Regulation Point
4.9
5.1
5.3
V
INTVCC Load Regulation
ICC = 0mA to 100mA, VIN ≥ 6V
ICC = 0mA to 100mA, VEXTVCC ≥ 6V
1.2
1.2
2
2
%
%
EXTVCC LDO Switchover Voltage
EXTVCC Rising
4.5
4.7
4.8
V
EXTVCC Switchover Hysteresis
250
mV
UVLO
Undervoltage Lockout
INTVCC Rising
INTVCC Falling
l
l
4.10
3.75
4.20
3.85
4.35
4.00
V
V
Spread Spectrum Oscillator and Phase-Locked Loop
fOSC
Low Fixed Frequency
VFREQ = 0V, PLLIN/SPREAD = 0V
320
350
380
kHz
High Fixed Frequency
VFREQ = INTVCC, PLLIN/SPREAD = 0V
l
2.0
2.25
2.5
MHz
Programmable Frequency
RFREQ = 374kΩ, PLLIN/SPREAD = 0V
RFREQ = 75kΩ, PLLIN/SPREAD = 0V
RFREQ = 12.1kΩ, PLLIN/SPREAD = 0V
450
100
500
3
550
kHz
kHz
MHz
Synchronizable Frequency Range
PLLIN/SPREAD = External Clock
l
0.1
3
MHz
PLLIN Input High Level
PLLIN Input Low Level
l
l
2.2
0.5
V
V
Spread Spectrum Frequency Range
(Relative to fOSC)
PLLIN/SPREAD = INTVCC
Minimum Frequency
Maximum Frequency
–12
15
%
%
PGOOD1 and PGOOD2 Outputs
PGOOD Voltage Low
IPGOOD1,2 = 2mA
0.2
0.4
V
PGOOD Leakage Current
VPGOOD1,2 = 5V
±1
µA
PGOOD Trip Level
VFB Relative to Set Regulation Point
VFB Rising
Hysteresis
7
10
2.5
13
%
%
VFB Falling
Hysteresis
–13
–10
2.5
–7
%
%
PGOOD Delay for Reporting a Fault
25
µs



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