LTC1709EG-85 查看數據表（PDF） - Linear Technology
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LTC1709EG-85
Linear Technology
LTC1709EG-85 Datasheet PDF : 28 Pages
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LTC1709-85
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VBIAS = 3.3V, VRUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
PGOOD Output
VPGL
IPGOOD
VPG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Differential Amplifier/Op Amp Gain Block
ADA
CMRRDA
RIN
Gain
Common Mode Rejection Ratio
Input Resistance
CONDITIONS
IPGOOD = 2mA
VPGOOD = 5V
VEAIN with Respect to Set Output Voltage
VEAIN Ramping Negative
VEAIN Ramping Positive
0V < VCM < 5V
Measured at VOS+ Input
MIN TYP MAX UNITS
0.1
0.3
V
±1
µA
–6
– 7.5 – 9.5
%
6
7.5
9.5
%
0.995
1
1.005
V/V
46
55
dB
80
kΩ
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: The LTC1709EG-85 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 formula:
LTC1709EG-85: TJ = TA + (PD • 85°C/W)
Note 4: The LTC1709-85 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).
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
(3 Operating Modes)
100
Burst Mode
90 OPERATION
80
70
FORCED
60
CONTINUOUS
50
MODE
40
30
20
10
0
0.01
CONSTANT
FREQUENCY
(BURST DISABLE)
VIN = 5V
VOUT = 1.6V
FREQ = 200kHz
0.1
1
10
100
LOAD CURRENT (A)
170985 G01
Efficiency vs Output Current
100
80
60
40
20
0
0.1
VIN = 5V
VIN = 8V
VIN = 12V
VIN = 20V
VOUT = 1.825V
VEXTVCC = 0V
FREQ = 200kHz
VFCB = 0V
1
10
100
OUTPUT CURRENT (A)
170985 G02
Efficiency vs Input Voltage
100
IOUT = 20A
VOUT = 1.825V
90
80
70
60
50
5
10
15
INPUT VOLTAGE (V)
20
170985 G03
170985f
4
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