MAX5099 datasheet(3/27 Pages) MAXIM

Part #	MAX5099

Description	Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual, 2.2MHz, Automotive Synchronous Buck

Converter with 80V Load-Dump Protection

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Rising, ON/OFF = IN_HIGH, GATE rising

3.6

4.1

IN_HIGH Startup Voltage

IN_HIGH

UVLO

Falling, ON/OFF = IN_HIGH, GATE falling

3.45

V

GATE Charge Current

IGATE_CH

VIN_HIGH = VON/OFF = 14V,

VGATE = V+ = 0V

20

45

80

μA

V+ = VIN_HIGH = VON/OFF = 4.5V,

IGATE = 1μA

4.0

5.3

7.5

GATE Output Voltage

VGATE -

VIN_HIGH

V+ = VIN_HIGH = VON/OFF = 14V,

IGATE = 1μA

9

V

GATE Turn-Off Pulldown

Current

IGATE_PD

VIN_HIGH = 14V, VON/OFF = 0V, V+ = 0V,

VGATE = 5V

3.6

mA

STARTUP/VL REGULATOR

VL Undervoltage-Lockout Trip

Level

UVLO

VL falling

3.9

4.1

4.3

V

VL Undervoltage-Lockout

Hysteresis

180

mV

VL Output Voltage

VL

ISOURCE_ = 0 to 40mA, 5.5V

≤ V+ ≤ 19V

5.0

5.2

5.5

V

VL LDO Short-Circuit Current

IVL_SHORT

V+ = VIN_HIGH = 5.2V

130

mA

VL LDO Dropout Voltage

VLDO

ISOURCE_ = 40mA, V+ = VIN_HIGH = 4.5V

300

550

mV

BYPASS OUTPUT

BYPASS Voltage

VBYPASS

IBYPASS = 0μA

1.98

2.00

2.02

V

BYPASS Load Regulation

ΔVBYPASS

0 < IBYPASS < 100μA (sourcing)

2

5

mV

SOFT-START/SOFT-STOP

Digital Ramp Period Soft-

Start/Soft-Stop

Internal 6-bit DAC

2048

fSW

Clock

Cycles

Soft-Start/Soft-Stop Steps

64

Steps

VOLTAGE-ERROR AMPLIFIER

FB_ Input Bias Current

IFB_

250

nA

-40°C

≤ TA ≤ +85°C

0.783

0.8

0.809

FB_ Input-Voltage Set Point

VFB_

-40°C

≤ TA ≤ +125°C

0.785

0.814

V

FB_ to COMP_

Transconductance

gM

1.4

2.4

3.4

mS

INTERNAL MOSFETS

ISWITCH = 100mA, BST1/VDD1 to

VSOURCE1 = 5.2V

195

On-Resistance High-Side

MOSFET Converter 1

RON1

ISWITCH = 100mA, BST1/VDD1 to

VSOURCE1 = 4.5V

208

355

m

Ω

ELECTRICAL CHARACTERISTICS (continued)

(VDRV = VL, V+ = VL = IN_HIGH = 5.2V or V+ = IN_HIGH = 5.2V to 19V, EN_ = VL, SYNC = GND, IVL = 0mA, PGND = SGND,

CBYPASS = 0.22μF (low ESR), CVL = 4.7μF (ceramic), CV+ = 1μF (low ESR), CIN_HIGH = 1μF (ceramic), RIN_HIGH = 3.9kΩ, ROSC = 10kΩ,

TJ = -40°C to +125°C, unless otherwise noted.) (Note 2)

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