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LTC7803 Datasheet(PDF) 3 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) 3 Page - Analog Devices

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LTC7817
3
Rev 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply (VBIAS, VIN)
VBIAS
Bias Input Supply Operating Voltage Range
4.5
40
V
VIN
Boost Converter Input Supply Operating
Range
VBIAS ≥ 4.5V
1
40
V
Front Page Circuit, 14V to 3.3V, No Load,
RUN2,3 = 0V
14
µA
Controller Operation
VOUT1,2
Buck Output Voltage Operating Range
0.8
40
V
VOUT3
Boost Output Voltage Operating Range
40
V
VFB1,2
Buck Regulated Feedback Voltage
(Note 4) VBIAS = 4.5V to 40V,
ITH1,2 Voltage = 0.6V to 1.2V
0ºC to 85ºC, All Grades
l
0.788
0.792
0.800
0.800
0.812
0.808
V
V
VFB3
Boost Regulated Feedback Voltage
(Note 4) VBIAS = 4.5V to 40V,
ITH3 Voltage = 0.6V to 1.2V,
VPRG3 = FLOAT
VPRG3 = 0V
VPRG3 = INTVCC
l
l
l
1.177
7.81
9.77
1.195
8.00
10.0
1.213
8.13
10.17
V
V
V
Buck Feedback Current
±5
±50
nA
Boost Feedback Current
VPRG3 = FLOAT
RUN3 = 0V, VPRG3 = 0V or INTVCC
RUN3 = 2V, VPRG3 = 0V or INTVCC
±5
±5
1
±50
±50
nA
nA
µA
Buck Feedback Overvoltage Protection
Threshold
Measured at VFB1,2 Relative to
Regulated VFB1,2
7
10
13
%
gm1,2,3
Transconductance Amplifier gm
(Note 4) ITH1,2,3=1.2V, Sink/Source=5μA
1.8
mmho
VSENSE(MAX)
Maximum Current Sense Threshold
VFB1,2 = 0.7V, VSENSE1,2– = 3.3V
VFB3 = 1.1V, VSENSE3+ = 12V
l
45
50
55
mV
Matching for Channels 1 & 2
VSENSE1,2– = 3.3V
–3.5
0
3.5
mV
ISENSE1,2+
SENSE1,2+ Pin Current
VSENSE1,2+ = 3.3V
±1
µA
ISENSE3–
SENSE3– Pin Current
VSENSE3– = 12V
±1
µA
ISENSE1–
SENSE1– Pin Current
VSENSE1– ≤ 2.7V
3.2V ≤ VSENSE1– < INTVCC – 0.5V
VSENSE1– > INTVCC + 0.5V
2
40
660
µA
µA
µA
ISENSE2–
SENSE2– Pin Current
VSENSE2– = 3.3V
VSENSE2– > INTVCC + 0.5V
620
±2
µA
µA
ISENSE3+
SENSE3+ Pin Current
VSENSE3+ = 3.3V
VSENSE3+ > INTVCC + 0.5V
660
±2
µA
µA
Soft-Start Charge Current
VTRACK/SS1,2 = 0V, VSS3 = 0
10
12.5
15
µA
RUN Pin ON Threshold
VRUN1,2,3 Rising
l
1.15
1.20
1.25
V
RUN Pin Hysteresis
VRUN1,2,3 Falling
100
mV
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)



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