LTC1709-7_15 datasheet(4/28 Pages) LINER

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LTC1709-7

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 = 5V, VRUN/SS = 5V unless otherwise noted.

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 1: Absolute Maximum Ratings are those values beyond which the

life of a device may be impaired.

Note 2: The LTC1709EG-7 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-7: TJ = TA + (PD • 85°C/W)

Note 4: The LTC1709-7 is tested in a feedback loop that servos VITH to a

specified voltage and measures the resultant VEAIN.

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Load Current

(3 Operating Modes) (Figure 12)

LOAD CURRENT (A)

100

0.01

0.1

17097 G01

100

FORCED

CONTINUOUS

MODE

Burst Mode

OPERATION

VIN = 5V

VOUT = 1.6V

FREQ = 200kHz

CONSTANT

FREQUENCY

(BURST DISABLE)

Efficiency vs Output Current

(Figure 12)

OUTPUT CURRENT (A)

0.1

100

17097 G02

100

VOUT = 2V

VEXTVCC = 0V

FREQ = 200kHz

VFCB = 0V

VIN = 5V

VIN = 8V

VIN = 12V

VIN = 20V

INPUT VOLTAGE (V)

17097 G03

VOUT = 1.6V

100

VOUT = 2V

IOUT = 20A

Efficiency vs Input Voltage

(Figure 12)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PGOOD Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

VPG

PGOOD Trip Level, Either Controller

VEAIN with Respect to Set Output Voltage

VEAIN Ramping Negative

– 6

– 7.5

– 9.5

VEAIN Ramping Positive

7.5

9.5

Differential Amplifier/Op Amp Gain Block

ADA

Gain

0.995

1.005

V/V

CMRRDA

Common Mode Rejection Ratio

0V < VCM < 5V

RIN

Input Resistance

Measured at VOS+ Input

Ω

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