LTC1709EG-9 查看數據表（PDF） - Linear Technology

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LTC1709EG-9

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1709-8/LTC1709-9

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

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 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: TJ = TA + (PD • 85°C/W)

Note 4: The LTC1709-8/LTC1709-9 are 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 Output Current

(Figure 12)

100

80

VIN = 5V

60

VIN = 8V

VIN = 12V

VIN = 20V

40

20

0

0.1

VOUT = 2V

VEXTVCC = 0V

FREQ = 200kHz

1

10

100

OUTPUT CURRENT (A)

170989 G01

Efficiency vs Output Current

(Figure 12)

100

VEXTVCC = 5V

80

VEXTVCC = 0V

60

40

20

0

0.1

VIN = 12V

VOUT = 2V

FREQ = 200kHz

1

10

100

OUTPUT CURRENT (A)

170989 G02

Efficiency vs Output Current

(Figure 12)

100

VOUT = 3.3V

VEXTVCC = 5V

IOUT = 20A

90

80

70

5

10

15

VIN (V)

20

170989 G03

4

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