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LT1680ISW Scheda tecnica(PDF) 3 Page - Linear Technology

Il numero della parte LT1680ISW
Spiegazioni elettronici  High Power DC/DC Step-Up Controller
PDF  16 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT1680ISW Scheda tecnica(HTML) 3 Page - Linear Technology

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LT1680
ELECTRICAL CHARACTERISTICS
12VIN = 12V, VVC = 2V, VFB = VREF = 1.25V, CGATE = 3000pF, TA = 25°C unless otherwise noted.
Note 2: Supply current specification does not include external FET gate
charge currents. Actual supply currents will be higher and vary with
operating frequency, operating voltages and the type of external FETs used.
See Applications Information.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amplifier
VSENSE
Peak Current Limit Threshold
Measured at Sense Inputs
q
170
190
mV
Average Current Limit Threshold
Measured at Sense Inputs, VCMSENSE = 10V
q
110
120
130
mV
VIAVG
Average Current Limit Threshold
Measured at IAVG Pin
2.5
V
Current Sense Amplifier
AV
Amplifier DC Gain
Measured at IAVG Pin
15
V/V
VOS
Amplifier Input Offset Voltage
2V < VCMSENSE < 60V,
q
0.1
mV
SENSE+ – SENSE– = 5mV
IBIAS
Input Bias Current
Sink (VCMSENSE > 5V)
q
45
75
µA
Source (VCMSENSE = 0V)
q
700
1200
µA
Oscillator
fO
Operating Frequency, Free Run
q
200
kHz
Frequency Programming Error
fO ≤ 200kHz, RCT = 16.9k, CCT = 1000pF
q
–5
5
%
ICT
Timing Capacitor Discharge Current
LT1680C
q
2.20
2.5
2.75
mA
LT1680I
q
2.10
2.5
2.75
mA
VSYNC
SYNC Input Threshold
Rising Edge
q
0.8
2.0
V
fSYNC
SYNC Frequency Range
fSYNC ≤ 200kHz
q
fO
1.4fO
Output Drivers
VGATE
Undervoltage Output Clamp
12VIN ≤ 8.2V
q
0.4
0.7
V
Standby Mode Output Clamp
VRUN < 0.5V
q
0.1
V
Gate Output On Voltage
q
11
11.9
12
V
Gate Output Off Voltage
q
0.4
0.7
V
tGATER
Gate Output Rise Time
q
60
200
ns
tGATEF
Gate Output Fall Time
q
60
140
ns
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.



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