LTC1736 datasheet(3/28 Pages) LINER

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LTC1736

ELECTRICAL CHARACTERISTICS The q denotes 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 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:

LTC1736CG, LTC1736IG: TJ = TA + (PD • 110°C/W)

Note 3: The LTC1736 is tested in a feedback loop that servos VFB to the

balance point for the error amplifier (VITH = 1.2V).

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

delivered at the switching frequency. See Applications Information.

Note 5: Oscillator frequency is tested by measuring the COSC charge

current (IOSC) and applying the formula:

Note 6: With all five VID inputs floating (or tied to VIDVCC) the VIDVCC

current is typically < 1

µA. However, the VIDVCC current will rise and be

approximately equal to the number of grounded VID input pins times

(VIDVCC – 0.6V)/40k. (See the Applications Information section for more

detail.)

Note 7: 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 for more

detail.)

Note 8: The 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 9: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels.

CpF

OSC

CHG

DIS





















8 477 10

)

()

–

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

BG Transition Time:

(Note 9)

BG tr

Rise Time

CLOAD = 3300pF

BG tf

Fall Time

CLOAD = 3300pF

TG/BG T1D

Top Gate Off to Synchronous

CLOAD = 3300pF Each Driver

100

Gate-On Delay Time

TG/BG T2D

Synchronous Gate Off to Top

CLOAD = 3300pF Each Driver

Gate-On Delay Time

Internal VCC Regulator

VINTVCC

Internal VCC Voltage

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

5.0

5.2

5.4

VLDO(INT)

Internal VCC Load Regulation

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

0.2

VLDO(EXT)

EXTVCC Drop Voltage

ICC = 20mA, VEXTVCC = 5V

130

200

VEXTVCC

EXTVCC Switchover Voltage

ICC = 20mA, EXTVCC Ramping Positive

4.5

4.7

VEXTVCC(HYS)

EXTVCC Hysteresis

0.2

Oscillator

fOSC

Oscillator Frequency

(Note 5), COSC = 43pF

265

300

335

kHz

fH/fOSC

Maximum Sync Frequency Ratio

1.3

fFCB(SYNC)

FCB Pin Threshold For Sync

Ramping Negative

0.9

1.2

PGOOD Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

110

200

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

VPG

PGOOD Trip Level

VOSENSE with Respect to Set Output Voltage

VOSENSE Ramping Negative

– 6.0

– 7.5

– 9.5

VOSENSE Ramping Positive

6.0

7.5

9.5

VID Control

VIDVCC

VID Operating Supply Voltage

2.7

5.5

IVIDVCC

VID Supply Current

(Note 6) VIDVCC = 3.3V

0.01

µA

RVFB/VOSENSE

Resistance Between VOSENSE and VFB

Ω

RRATIO

Resistor Ratio Accuracy

Programmed from 0.925V to 2.00V

±0.05

RPULL-UP

VID0 to VID4 Pull-Up Resistance

(Note 7) VDIODE = 0.6V

Ω

VIDT

VID Input Voltage Threshold

0.4

1.0

1.6

IVIDLEAK

VID Input Leakage Current

(Note 7) VIDVCC < VID < 7V

0.01

±1

µA

VPULL-UP

VID Pull-Up Voltage

VIDVCC = 3.3V

2.8

VIDVCC = 5V

4.5

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