LTC1709 Ver la hoja de datos (PDF) - Linear Technology
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LTC1709
Linear Technology
LTC1709 Datasheet PDF : 28 Pages
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LTC1709
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RIN
VOS
IB
AOL
VCM
CMRROA
PSRROA
ICL
VO(MAX)
GBW
SR
Input Resistance
Input Offset Voltage
Input Bias Current
Open Loop DC Gain
Common Mode Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain-Bandwidth Product
Slew Rate
Differential Amp Mode; Measured at VOS+ Input
Op Amp Mode; VCM = 2.5V; VDIFFOUT = 5V;
IDIFFOUT = 1mA
Op Amp Mode
Op Amp Mode; 0.7V ≤ VDIFFOUT < 10V
Op Amp Mode
Op Amp Mode; 0V < VCM < 3V
Op Amp Mode; 6V < VIN < 30V
Op Amp Mode; VDIFFOUT = 0V
Op Amp Mode; IDIFFOUT = 1mA
Op Amp Mode; IDIFFOUT = 1mA
Op Amp Mode; RL = 2k
80
kΩ
6
mV
30
200
nA
5000
V/mV
0
3
V
70
90
dB
70
90
dB
10
35
mA
10
11
V
2
MHz
5
V/µs
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: The LTC1709EG is 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 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1709EG: TJ = TA + (PD • 85°C/W)
Note 4: The LTC1709 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VEAIN.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥ 40% IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Each built-in pull-up resistor attached to the VID inputs also has a
series diode to allow input voltages higher than the VIDVCC supply without
damage or clamping (see the Applications Information section).
Note 9: When the AMPMD pin is high, the IC pins are connected directly to
the internal op amp inputs. When the AMPMD pin is low, internal MOSFET
switches connect four 40k resistors around the op amp to create a
standard unity-gain differential amp.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
(Figure 12)
100
80
VIN = 5V
VIN = 8V
60
VIN = 12V
VIN = 20V
40
Efficiency vs Output Current
(Figure 12)
100
VOUT = 2V
VIN = 12V
80 f = 200kHz
60
VEXTVCC = 5V
VEXTVCC = 0V
40
20
0
0.1
VOUT = 2V
VEXTVCC = 0V
f = 200kHz
1
10
OUTPUT CURRENT (A)
100
1709 G01
20
0
0.1
INTERNAL LDO VS EXTERNALLY
APPLIED 5V OVERALL EFFICIENCY
(FIGURE 12)
1
10
OUTPUT CURRENT (A)
100
1709 G02
Efficiency vs Input Voltage
(Figure 12)
100
VOUT = 3.3V
VEXTVCC = 5V
IOUT = 20A
90
80
70
5
10
15
VIN (V)
20
1709 G03
4
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