LTC1929 Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

LTC1929

2-Phase, High Efficiency, Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1929/LTC1929-PG

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

IB

AOL

VCM

CMRROA

PSRROA

ICL

VO(MAX)

GBW

SR

PARAMETER

Input Bias Current

Open Loop DC Gain

Common Mode Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Maximum Output Current

Maximum Output Voltage

Gain-Bandwidth Product

Slew Rate

CONDITIONS

Op Amp Mode (LTC1929 Only)

Op Amp Mode; 0.7V ≤ VDIFFOUT < 10V

(LTC1929 Only)

Op Amp Mode (LTC1929 Only)

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

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

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

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

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

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

MIN TYP MAX UNITS

30

200

nA

5000

V/mV

0

3

V

70

90

dB

70

90

dB

10

35

mA

10

11

V

2

MHz

5

V/µs

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.

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).

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Output Current

(Figure 13)

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)

1929 G01

Efficiency vs Output Current

(Figure 13)

100

VEXTVCC = 5V

80

VEXTVCC = 0V

60

40

20

0

0.1

VIN = 12V

VOUT = 2V

FREQ = 200kHz

1

10

OUTPUT CURRENT (A)

100

1929 G02

Efficiency vs VIN

(Figure 13)

100

VEXTVCC = 5V

IOUT = 20A

90

VOUT = 2V

80

VOUT = 1.6V

70

60

50

5

10

15

VIN (V)

20

1929 G03

4

Share Link: