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LT1339C Datasheet(PDF) 3 Page - Linear Technology

No. de pieza LT1339C
Descripción Electrónicos  High Power Synchronous DC/DC Controller
PDF  20 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LT1339C Datasheet(HTML) 3 Page - Linear Technology

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LT1339
12VIN = VBOOST = 12V, VC = 2V, TS = 0V, VFB = VREF = 1.25V, CTG = CBG = 3000pF, TA = 25°C unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amplifier
VFB
Error Amplifier Reference Voltage
Measured at Feedback Pin
1.242
1.250
1.258
V
q
1.235
1.250
1.265
V
IFB
Feedback Input Current
VFB = VREF
q
0.1
0.5
1.0
µA
gm
Error Amplifier Transconductance
q
1200
2000
3200
µmho
AV
Error Amplifier Voltage Gain
q
1500
3000
V/V
IVC
Error Amplifier Source Current
q
200
275
µA
Error Amplifier Sink Current
VFB – VREF = 500mV
q
280
400
µA
VVC
Absolute VC Clamp Voltage
Measured at VC Pin
3.5
V
VSENSE
Peak Current Limit Threshold
Measured at Sense Inputs
q
170
190
mV
Average Current Limit Threshold (Note 4)
Measured at Sense Inputs
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
IB
Input Bias Current
Sink (VCMSENSE > 5V)
q
45
75
µA
Source (VCMSENSE = 0V)
q
700
1200
µA
Oscillator
fO
Operating Frequency, Free Run
q
150
kHz
Frequency Programming Error (Note 3)
fO ≤ 150kHz
q
–5
5
%
ICT
Timing Capacitor Discharge Current
LT1339C
q
2.20
2.50
2.75
mA
LT1339I
q
2.10
2.50
2.75
mA
VSYNC
SYNC Input Threshold
Rising Edge
q
0.8
2.0
V
fSYNC
SYNC Frequency Range
fSYNC ≤ 150kHz
q
fO
1.4fO
Output Drivers
VTG,BG
Undervoltage Output Clamp
12VIN ≤ 8V
q
0.4
0.7
V
Standby Mode Output Clamp
VRUN < 0.5V
q
0.1
V
VTG
Top Gate On Voltage
q
11.0
11.9
12.0
V
Top Gate Off Voltage
q
0.4
0.7
V
tTGR
Top Gate Rise Time
q
130
200
ns
tTGF
Top Gate Fall Time
q
60
140
ns
VBG
Bottom Gate On Voltage
q
11.0
11.9
12.0
V
Bottom Gate Off Voltage
q
0.4
0.7
V
tBGR
Bottom Gate Rise Time
q
70
200
ns
tBGF
Bottom Gate Fall Time
q
60
140
ns
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 Application Information section.
Note 3: Test condition: RCT = 16.9k, CCT = 1000pF.
Note 4: Test Condition: VCMSENSE = 10V.
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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