LTC1709 datasheet(4/28 Pages) LINER

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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.

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.

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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RIN

Input Resistance

Differential Amp Mode; Measured at VOS+ Input

Ω

VOS

Input Offset Voltage

Op Amp Mode; VCM = 2.5V; VDIFFOUT = 5V;

IDIFFOUT = 1mA

Input Bias Current

Op Amp Mode

200

AOL

Open Loop DC Gain

Op Amp Mode; 0.7V

≤ VDIFFOUT < 10V

5000

V/mV

VCM

Common Mode Input Voltage Range

Op Amp Mode

CMRROA

Common Mode Rejection Ratio

Op Amp Mode; 0V < VCM < 3V

PSRROA

Power Supply Rejection Ratio

Op Amp Mode; 6V < VIN < 30V

ICL

Maximum Output Current

Op Amp Mode; VDIFFOUT = 0V

VO(MAX)

Maximum Output Voltage

Op Amp Mode; IDIFFOUT = 1mA

GBW

Gain-Bandwidth Product

Op Amp Mode; IDIFFOUT = 1mA

MHz

Slew Rate

Op Amp Mode; RL = 2k

µs

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Output Current

(Figure 12)

Efficiency vs Output Current

(Figure 12)

Efficiency vs Input Voltage

(Figure 12)

OUTPUT CURRENT (A)

100

1709 G01

0.1

100

VOUT = 2V

VEXTVCC = 0V

f = 200kHz

VIN = 5V

VIN = 8V

VIN = 12V

VIN = 20V

OUTPUT CURRENT (A)

1709 G02

100

0.1

100

VOUT = 2V

VIN = 12V

f = 200kHz

INTERNAL LDO VS EXTERNALLY

APPLIED 5V OVERALL EFFICIENCY

(FIGURE 12)

VEXTVCC = 5V

VEXTVCC = 0V

VIN (V)

100

1709 G03

VOUT = 3.3V

VEXTVCC = 5V

IOUT = 20A

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