Rainbow-electronics MAX1765 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX1765

800mA, Low-Noise, Step-Up DC-DC Converter

with 500mA Linear Regulator

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

OUT

= V

POUT

= V

INL

= V

ONA

= V

ONL

= 3.6V, CLK/SEL = FBL = ONB = TRACK = PGND = GND, ISET = REF (bypassed with

0.22µF), LX = open, OUTL = open (bypassed with 4.7µF), T

= -40°C to +85°C, unless otherwise noted.) (Note 6)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CONTROL INPUTS

1.1V < V

OUT

< 1.8V 0.2

O N A, O NB, O N L

( N ote 5)

1.8V < V

OUT

< 5.5V 0.4

CLK/SEL 1.2V < V

OUT

< 5.5V

0.2 ×

OUT

Input Low Level

TRACK 1.2V < V

INL

< 5.5V

0.2 ×

INL

1.1V < V

OUT

< 1.8V

OUT

- 0.2

O N A, O NB, O N L

( N ote 5)

1.8V < V

OUT

< 5.5V 1.6

CLK/SEL 1.2V < V

OUT

< 5.5V

0.8 ×

OUT

Input High Level

TRACK 1.2V < V

INL

< 5.5V

0.8 ×

INL

Input Leakage Current

(CLK/SEL, ONA, ONB,

ONL, TRACK)

1 µA

Internal Oscillator Frequency CLK/SEL = OUT 0.8 1.2 MHz

Oscillator Maximum Duty Cycle 79 90 %

Note 1: Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to 0.7V input.

Note 2: The device is in startup mode when V

OUT

is below this value (see Low-Voltage Startup Oscillator section). Do not apply full

load current.

Note 3: Supply current into the OUT and POUT pins. This current correlates directly to the actual battery-supply current, but is

reduced in value according to the step-up ratio and efficiency.

Note 4: Minimum recommended ISET voltage in normal mode is 0.625V.

Note 5: ONA, ONB, ONL have hysteresis of approximately 0.15

OUT

Note 6: Specifications to -40°C are guaranteed by design and not production tested.

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