LTC1929 datasheet(4/28 Pages) LINER

4 / 28 page

LTC1929/LTC1929-PG

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Bias Current

Op Amp Mode (LTC1929 Only)

200

AOL

Open Loop DC Gain

Op Amp Mode; 0.7V

≤ VDIFFOUT < 10V

5000

V/mV

(LTC1929 Only)

VCM

Common Mode Input Voltage Range

Op Amp Mode (LTC1929 Only)

CMRROA

Common Mode Rejection Ratio

Op Amp Mode; 0V < VCM < 3V (LTC1929 Only)

PSRROA

Power Supply Rejection Ratio

Op Amp Mode; 6V < VIN < 30V (LTC1929 Only)

ICL

Maximum Output Current

Op Amp Mode; VDIFFOUT = 0V (LTC1929 Only)

VO(MAX)

Maximum Output Voltage

Op Amp Mode; IDIFFOUT = 1mA (LTC1929 Only)

GBW

Gain-Bandwidth Product

Op Amp Mode; IDIFFOUT = 1mA (LTC1929 Only)

MHz

Slew Rate

Op Amp Mode; RL = 2k (LTC1929 Only)

µs

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.

Note 5: When the AMPMD pin is high (default for the LTC1929-PG), the

LTC1929 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 6: Minimum on-time condition corresponds to the on inductor

peak-to-peak ripple current

≥40% of IMAX (see minimum on-time

considerations in the Applications Information section).

Note 1: Absolute Maximum Ratings are those values beyond which the

life of a device may be impaired.

Note 2: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC1929CG: TJ = TA + (PD • 95°C/W)

Note 3: The LTC1929 is tested in a feedback loop that servos VITH to a

specified voltage and measures the resultant VEAIN.

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Output Current

(Figure 13)

OUTPUT CURRENT (A)

0.1

100

1929 G01

100

VOUT = 2V

VEXTVCC = 0V

FREQ = 200kHz

VIN = 5V

VIN = 8V

VIN = 12V

VIN = 20V

OUTPUT CURRENT (A)

0.1

1929 G02

100

VIN = 12V

VOUT = 2V

FREQ = 200kHz

VEXTVCC = 5V

VEXTVCC = 0V

VIN (V)

100

1929 G03

VEXTVCC = 5V

IOUT = 20A

VOUT = 2V

VOUT = 1.6V

Efficiency vs Output Current

(Figure 13)

Efficiency vs VIN

(Figure 13)

The q denotes the specifications which apply over the full operating

LTC1929 Datasheet(PDF) 4 Page - Linear Technology

LTC1929 Datasheet(HTML) 4 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL