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LTC7803 Datasheet(PDF) 4 Page - Analog Devices

Part # LTC7803
Description  40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 4 Page - Analog Devices

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LTC7817
4
Rev 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS The
l
indicates specifications which apply over the specified operating
junction temperature range, otherwise specifications are for TA = 25°C, VBIAS = 12V, RUN1,2,3 > 1.25V, EXTVCC = 0V, VPRG3 = FLOAT
unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC Supply Current (Note 5)
VBIAS Shutdown Current
RUN1, 2, 3 = 0V
1.5
µA
VBIAS Sleep Mode Current
VSENSE1– < 3.2V, EXTVCC = 0V
One Channel On
All Channels On
15
18
24
30
µA
µA
Sleep Mode Current (Note 3)
Only Channel 1 On
VSENSE1– ≥ 3.2V
VBIAS Current, EXTVCC = 0V
VBIAS Current, EXTVCC = 4.8V
EXTVCC Current, EXTVCC ≥ 4.8V
SENSE1– Current
5
1
5
10
9
4
10
18
µA
µA
µA
µA
Sleep Mode Current (Note 3)
All Channels On
VSENSE1– ≥ 3.2V, EXTVCC ≥4.8V
VBIAS Current
EXTVCC Current
SENSE1– Current
1
8
16
4
14
26
µA
µA
µA
Pulse-Skipping or Forced Continuous Mode
VBIAS or EXTVCC Current (Note 3)
One Channel On
All Channels On
1.5
3
mA
mA
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
Bucks (Channels 1, 2)
Boost (Channel 3)
15
15
ns
ns
BG Off to TG On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
Bucks (Channels 1, 2)
Boost (Channel 3)
15
15
ns
ns
tON(MIN)1,2
Buck TG Minimum On-Time
(Note 7)
40
ns
tON(MIN)3
Boost BG Minimum On-Time
(Note 7)
80
ns
Maximum Duty Factor for TG
Bucks (Channels 1,2), FREQ = 0V
Boost (Channel 3) in Overvoltage
98
99
100
%
%
Maximum Duty Factor for BG
Bucks (Channels 1,2) in Overvoltage
Boost (Channel 3), FREQ = 0V
100
93
%
%
BOOST3 Charge Pump Available
Output Current
VBOOST3 = 16V, VSW3 = 12V, FREQ = 0V,
Forced Continuous Mode
20
50
µA



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