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LTC3832 데이터시트(PDF) 3 Page - Linear Technology

부품명 LTC3832
상세설명  High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3832 데이터시트(HTML) 3 Page - Linear Technology

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LTC3832/LTC3832-1
sn3832 3832fs
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IVCC
Supply Current
Figure 2, VSHDN = VCC
q
0.7
1.6
mA
VSHDN = 0V
q
110
µA
IPVCC
PVCC Supply Current
Figure 2, VSHDN = VCC (Note 3)
q
20
30
mA
VSHDN = 0V
q
0.1
10
µA
fOSC
Internal Oscillator Frequency
FREQSET Floating
q
230
300
360
kHz
VSAWL
VCOMP at Minimum Duty Cycle
1.2
V
VSAWH
VCOMP at Maximum Duty Cycle
2.2
V
VCOMPMAX
Maximum VCOMP
VFB = 0V, PVCC1 = 8V
2.85
V
∆fOSC/∆IFREQSET Frequency Adjustment
10
kHz/
µA
AV
Error Amplifier Open-Loop DC Gain
Measured from FB to COMP,
q
50
65
dB
SENSE+ and SENSEFloating, (Note 4)
gm
Error Amplifier Transconductance
Measured from FB to COMP,
q
1600
2000
2400
µmho
SENSE+ and SENSEFloating, (Note 4)
ICOMP
Error Amplifier Output Sink/Source Current
100
µA
IMAX
IMAX Sink Current
VIMAX = VCC
812
16
µA
(Note 10)
q
412
20
µA
IMAX Sink Current Tempco
VIMAX = VCC (Note 6)
3300
ppm/
°C
VIH
SHDN Input High Voltage
q
2.4
V
VIL
SHDN Input Low Voltage
q
0.8
V
IIN
SHDN Input Current
VSHDN = VCC
q
0.1
1
µA
ISS
Soft-Start Source Current
VSS = 0V, VIMAX = 0V, VIFB = VCC
q
–8
–12
–18
µA
ISSIL
Maximum Soft-Start Sink Current
VIMAX = VCC, VIFB = 0V,
1.6
mA
In Current Limit
VSS = VCC (Note 8), PVCC1 = 8V
RSENSE
SENSE Input Resistance
23.7
k
RSENSEFB
SENSE to FB Resistance
18
k
tr, tf
Driver Rise/Fall Time
Figure 2, PVCC1 = PVCC2 = 5V (Note 5)
q
80
250
ns
tNOV
Driver Nonoverlap Time
Figure 2, PVCC1 = PVCC2 = 5V (Note 5)
q
25
120
250
ns
DCMAX
Maximum G1 Duty Cycle
Figure 2, VFB = 0V (Note 5), PVCC1 = 8V
q
91
95
%
The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VCC, PVCC1, PVCC2 = 5V, unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: Supply current in normal operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC3832 operating frequency, operating voltage and the external FETs
used.
Note 4: The open-loop DC gain and transconductance from the SENSE+
and SENSEpins to COMP pin will be (AV)(0.6/2.5) and (gm)(0.6/2.5)
respectively.
Note 5: Rise and fall times are measured using 10% and 90% levels. Duty
cycle and nonoverlap times are measured using 50% levels.
Note 6: Guaranteed by design, not subject to test.
Note 7: PVCC1 must be higher than VCC by at least 2.5V for G1 to operate
at 95% maximum duty cycle and for the current limit protection circuit to
be active.
Note 8: The current limiting amplifier can sink but cannot source current.
Under normal (not current limited) operation, the output current will be
zero.
Note 9: The LTC3832E/LTC3832-1E are guaranteed to meet performance
specifications from 0
°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 10: The minimum and maximum limits for IMAX over temperature
includes the intentional temperature coefficient of 3300ppm/
°C. This
induced temperature coefficient counteracts the typical temperature
coefficient of the external power MOSFET on-resistance. This results in a
relatively flat current limit over temperature for the application.


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