LTC3611 Просмотр технического описания (PDF) - Linear Technology

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LTC3611

10A, 32V Monolithic Synchronous Step-Down DC/DC Converter

Linear Technology 

LTC3611

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

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

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Internal VCC Regulator

VINTVCC

Internal VCC Voltage

ΔVLDO(LOADREG)

VEXTVCC

ΔVEXTVCC

ΔVEXTVCC(HYS)

PGOOD Output

Internal VCC Load Regulation

EXTVCC Switchover Voltage

EXTVCC Switch Drop Voltage

EXTVCC Switchover Hysteresis

ΔVFBH

PGOOD Upper Threshold

ΔVFBL

ΔVFB(HYS)

VPGL

PGOOD Lower Threshold

PGOOD Hysteresis

PGOOD Low Voltage

6V < VIN < 30V, VEXTVCC = 4V

ICC = 0mA to 20mA, VEXTVCC = 4V

ICC = 20mA, VEXTVCC Rising

ICC = 20mA, VEXTVCC = 5V

VFB Rising

VFB Falling

VFB Returning

IPGOOD = 5mA

l 4.7

5

5.6

V

–0.1

±2

%

l 4.5

4.7

V

150

300

m/V

500

m/V

7

10

13

%

–7

–10

–13

%

1

2.5

%

0.15

0.4

V

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

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

dissipation PD as follows:

TJ = TA + (PD • 28°C/W) (θJA is simulated per JESD51-7 high

effective thermal conductivity test board)

θJC = 1°C/W (θJC is simulated when heatsink is applied at the

bottom of the package)

Note 3: The LTC3611 is tested in a feedback loop that adjusts VFB to

achieve a specified error amplifier output voltage (ITH). The specification at

85°C is not tested in production. This specification is assured by design,

characterization, and correlation to testing at 125°C.

Note 4: The LTC3611E is guaranteed to meet performance specifications

from 0°C to 125°C. Specifications over the –40°C to 125°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTC3611I is guaranteed over the full

–40°C to 125°C operating temperature range.

TYPICAL PERFORMANCE CHARACTERISTICS

Transient Response

VOUT

200mV/DIV

IL

5A/DIV

ILOAD

5A/DIV

40μs/DIV

LOAD STEP 0A TO 8A

VIN = 25V

VOUT = 2.5V

FCB = 0

FIGURE 6 CIRCUIT

Transient Response

(Discontinuous Mode)

VOUT

200mV/DIV

3611 G01

IL

5A/DIV

ILOAD

5A/DIV

40μs/DIV

LOAD = 1A TO 10A

VIN = 25V

VOUT = 2.5V

FCB = INTVCC

FIGURE 6 CIRCUIT

Start-Up

RUN/SS

2V/DIV

3611 G02

VOUT

1V/DIV

IL

5A/DIV

40ms/DIV

VIN = 25V

VOUT = 2.5V

RLOAD = 0.5Ω

FIGURE 6 CIRCUIT

3611 G03

3611fb

4

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