LTC3609IWKG-TRPBF(RevB) Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

LTC3609IWKG-TRPBF
(Rev.:RevB)

32V, 6A Monolithic Synchronous Step-Down DC/DC Converter

Linear Technology 

LTC3609

Electrical Characteristics The l denotes the specifications which apply over the full operating

junction 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

∆VLDO(LOADREG) Internal VCC Load Regulation

VEXTVCC

EXTVCC Switchover Voltage

∆VEXTVCC

EXTVCC Switch Drop Voltage

∆VEXTVCC(HYS)

EXTVCC Switchover Hysteresis

PGOOD Output

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

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

ICC = 20mA, VEXTVCC Rising

ICC = 20mA, VEXTVCC = 5V

l 4.7

5

5.5

V

–0.1

±2

%

l 4.5

4.7

V

150

300

mV

500

mV

∆VFBH

∆VFBL

∆VFB(HYS)

VPGL

PGOOD Upper Threshold

PGOOD Lower Threshold

PGOOD Hysteresis

PGOOD Low Voltage

VFB Rising

VFB Falling

VFB Returning

IPGOOD = 5mA

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 • 29°C/W) (θJA is simulated per JESD51-7 high effective

thermal conductivity test board).

θJC = 1°C/W (θJC is simulated when heat sink is applied at the bottom

of the package).

Note 3: The LTC3609 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 LTC3609 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3609E is guaranteed to meet specifications from

0°C to 125°C junction temperature. Specifications over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3609I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors.

Typical Performance Characteristics

Transient Response

Transient Response

(Discontinuous Mode)

Start-Up

VOUT

200mV/DIV

IL

5A/DIV

ILOAD

5A/DIV

20µs/DIV

LOAD STEP 0A TO 5A

VIN = 25V

VOUT = 2.5V

FCB = 0V

FIGURE 6 CIRCUIT

VOUT

200mV/DIV

3609 G01

IL

5A/DIV

ILOAD

5A/DIV

20µs/DIV

LOAD STEP 1A TO 6A

VIN = 25V

VOUT = 2.5V

FCB = INTVCC

FIGURE 6 CIRCUIT

RUN/SS

2V/DIV

3609 G02

VOUT

1V/DIV

IL

5A/DIV

40ms/DIV

VIN = 12V

VOUT = 2.5V

RLOAD = 0.5Ω

FIGURE 6 CIRCUIT



3609 G03

3609fb

Share Link: