MAX8505EEE datasheet(2/15 Pages) MAXIM

2 / 15 page

3A, 1MHz, 1% Accurate, Internal Switch

Step-Down Regulator with Power-OK

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = VCC = VCTL = +3.3V, VFB = 0.8V, VCOMP = 1.25V, CREF = 0.01µF, TA = 0°C to +85°C, unless otherwise noted.)

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.

CTL, FB, IN, VCC to GND .........................................-0.3V to +6V

COMP, REF, POK to GND ..........................-0.3V to (VCC + 0.3V)

BST to LX..................................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 12.5mW/°C above +70°C).......1000mW

Operating Temperature Range

MAX8505EEE...................................................-40°C to +85°C

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

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

IN AND VCC

IN Voltage Range

VIN

2.25

VCC

VCC Voltage Range

VCC

2.6

5.5

VIN = 3.3V

IN Supply Current

IIN

Switching with no load

VIN = 5.5V

VCC = 3.3V

VCC Supply Current

ICC

Switching with no load

VCC = 5.5V

Total Shutdown Current into IN

and VCC

ISHDN

VIN = VCC = VBST - VLX = 5.5V, VCTL = 0V,

VLX = 0

µA

VCC rising

2.40

2.55

VCC Undervoltage Lockout

Threshold

UVLOth

When LX starts/stops

switching

VCC falling

2.2

2.35

REF

REF Voltage

VREF

IREF = 0µA, VIN = VCC = 2.6V to 5.5V

0.792

0.800

0.808

REF Shutdown Resistance

From REF to GND, VCTL = 0V

100

Ω

REF Soft-Start Current

VREF = 0.4V

µA

Soft-Start Ramp Time

Output from 0% to 100%, CREF = 0.01µF to

1µF

ms/µF

FB Regulation Voltage

VIN = 2.6V to 5.5V

0.792

0.800

0.808

FB Input Bias Current

VFB = 0.7V

0.01

0.1

µA

Maximum Output Current

IOUT_MAX

VIN = VCC = 3.3V, VOUT = 1.2V,

L = 1µH/5.9m

Ω (Note 1)

FB high

10.5

13.5

FB Threshold for POK Transition

FB rising or falling

FB low

-13.5

-12

-10.5

FB to POK Delay

FB rising or falling

µs

COMP

COMP Transconductance

From FB to COMP

100

160

µS

Gain from FB to COMP

VCOMP = 1.25V to 1.75V

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