LM73606 datasheet(8/53 Pages) TI1

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LM73605, LM73606

SNVSAH5 – SEPTEMBER 2017

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Timing Characteristics (continued)

MIN

NOM

MAX

UNIT

SOFT START (SS/TRK PIN)

tSS

Internal soft-start time

CSS = OPEN, from EN rising

edge to PGOOD rising edge

3.5

6.3

POWER GOOD (PGOOD PIN) and OVERVOLTAGE PROTECTION

tPGOOD_RISE

PGOOD rising edge deglitch

delay

140

200

µs

tPGOOD_FALL

PGOOD falling edge deglitch

delay

140

200

µs

6.7 Switching Characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PWM LIMITS (SW PINS)

tON-MIN

Minimum switch on-time

tOFF-MIN

Minimum switch off-time

120

tON-MAX

Maximum switch on-time

HS timeout in dropout

µs

OSCILLATOR (RT and SYNC PINS)

fOSC

Internal oscillator frequency

RT = Open

440

500

560

kHz

fADJ

Minimum adjustable frequency by

RT or SYNC

RT =115 kΩ, 0.1%

315

350

385

kHz

Maximum adjustable frequency by

RT or SYNC

RT = 17.4 kΩ, 0.1%

1980

2200

2420

kHz

VSYNC_HIGH

Sync input high level threshold

VSYNC_LOW

Sync input low level threshold

0.4

VMODE_HIGH

Mode input high level threshold for

FPWM

0.42

VMODE_LOW

Mode input low level threshold for

AUTO mode

0.4

tSYNC_MIN

Sync input minimum ON and OFF-

time

6.8 System Characteristics

The following specifications apply to the circuit found in typical schematic with appropriate modifications from typical bill of

materials. These parameters are not tested in production and represent typical performance only. Unless otherwise stated the

following conditions apply: TA = 25°C, VIN = 12 V, VOUT = 3.3 V, fSW = 500 kHz.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VFB_PFM

Output voltage offset at no load

in auto mode

VIN = 3.8 V to 36 V, VSYNC = 0 V, auto mode

IOUT = 0 A

VDROP

Minimum input to output

voltage differential to maintain

specified accuracy

VOUT = 5 V, IOUT = 3 A, fSW = 2.2 MHz

0.4

IQ_SW

Operating quiescent current

(switching)

VEN = 3.3 V, IOUT = 0 A, RT = open, VBIAS =

VOUT = 3.3 V , RFBT = 1 Meg

µA

IPEAK_MIN

Minimum inductor peak current

LM73605:

VSYNC = 0, IOUT = 10 mA

LM73606:

VSYNC = 0 V, IOUT = 10 mA

1.3

IBIAS_SW

Operating quiescent current

from external VBIAS (switching)

fSW = 500 kHz, IOUT = 1 A

fSW = 2.2 MHz, IOUT = 1 A

DMAX

Maximum switch duty cycle

While in frequency foldback

97.5%

tDEAD

Dead time between high-side

and low-side MOSFETs

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