MAX17499 Просмотр технического описания (PDF) - Maxim Integrated

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MAX17499

Current-Mode PWM Controllers with Programmable Switching Frequency

Maxim Integrated 

Current-Mode PWM Controllers with

Programmable Switching Frequency

ABSOLUTE MAXIMUM RATINGS

IN to GND ...............................................................-0.3V to +30V

IN Clamp (internal shunt) Current .........................................5mA

VCC to GND ............................................................-0.3V to +13V

FB, COMP, UVLO/EN, RT, CS to GND .....................-0.3V to +6V

UFLG to GND .........................................................-0.3V to +30V

NDRV to GND.............................................-0.3V to (VCC + 0.3V)

Continuous Power Dissipation (TA = +70°C)

10-Pin μMAX (derate 5.6mW/°C above +70°C) ........444.4mW

Operating Temperature Range .........................-40°C to +125°C

Storage Temperature Range ............................-65°C to +150°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VIN = +12V (for MAX17500, bring VIN up to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX17499A/

MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open,

VUVLO/EN = +1.4V, VFB = +1.0V, COMP = open, VCS = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA =

+25°C.) (Note 1)

PARAMETER

UVLO/STARTUP

Bootstrap UVLO Wake-Up Level

Bootstrap UVLO Shutdown Level

UVLO/EN Wake-Up Threshold

UVLO/EN Shutdown Threshold

UVLO/EN Input Current

UVLO/EN Hysteresis

IN Supply Current In UVLO

IN Input Voltage Range

UVLO/EN to UFLG Propagation

Delay (Figure 3)

UVLO/EN to NDRV Propagation

Delay (Figure 3)

Bootstrap UVLO Propagation

Delay

UFLG Low Output Voltage

UFLG High Output Leakage

Current

INTERNAL SUPPLY

VCC Regulator Set Point

IN Supply Current After Startup

Shutdown Supply Current

SYMBOL

CONDITIONS

VSUVR

VSUVF

VULR2

VULF2

IUVLO

VIN rising (MAX17500 only)

VIN falling (MAX17500 only)

UVLO/EN rising

UVLO/EN falling

VUVLO/EN ≤ 2V

ISTART

VIN

tEXTR

tEXTF

tBUVR

tBUVF

VUFLG

VIN = 19V, MAX17500 only when in

bootstrap UVLO

MAX17499 only

UVLO/EN steps up from 1V to 1.4V

UVLO/EN steps down from 1.4V to 1V

UVLO/EN steps up from 1V to 1.4V

UVLO/EN steps down from 1.4V to 1V

VIN steps up from 9V to 24V (MAX17500

only)

VIN steps down from 24V to 9V

(MAX17500 only)

IUFLG = 5mA sinking

VUFLG = 25V

VCCSP

IIN

VIN = 10.8V to 24V, sinking 1μA to 20mA

from VCC

VIN = 24V

UVLO/EN = low

MIN

19.68

9.05

1.215

1.14

-50

9.5

150

7.0

TYP

21.6

9.74

1.23

1.17

60

50

3

0.6

3

210

5

1

0.1

2

50

MAX UNITS

23.60

V

10.43

V

1.245

V

1.20

V

+50

nA

mV

90

μA

24.0

V

μs

10

ms

300

μs

μs

1.5

V

1

μA

10.5

V

4

mA

90

μA

2 _______________________________________________________________________________________

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