MAX1765(2000) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1765
(Rev.:2000)

800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator

Maxim Integrated 

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

with 500mA Linear Regulator

ELECTRICAL CHARACTERISTICS (continued)

(VOUT = VPOUT = VINL = VONA = VONL = 3.6V, CLK/SEL = FBL = ONB = TRACK = PGND = GND, ISET = REF (bypassed with

0.22µF), LX = open, OUTL = open (bypassed with 4.7µF), TA = -40°C to +85°C, unless otherwise noted.) (Note 6)

PARAMETER

CONTROL INPUTS

Input Low Level

Input High Level

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

ONA, ONB, ONL

(Note 5)

CLK/SEL

TRACK

ONA, ONB, ONL

(Note 5)

CLK/SEL

TRACK

1.1V < VOUT < 1.8V

1.8V < VOUT < 5.5V

1.2V < VOUT < 5.5V

1.2V < VINL < 5.5V

1.1V < VOUT < 1.8V

1.8V < VOUT < 5.5V

1.2V < VOUT < 5.5V

1.2V < VINL < 5.5V

VOUT

- 0.2

1.6

0.8 ×

VOUT

0.8 ×

VINL

0.2

0.4

0.2 ×

VOUT

V

0.2 ×

VINL

V

Input Leakage Current

(CLK/SEL, ONA, ONB,

ONL, TRACK)

1

µA

Internal Oscillator Frequency

Oscillator Maximum Duty Cycle

CLK/SEL = OUT

0.8

1.2 MHz

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 VOUT 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 ✕ VOUT.

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

6 _______________________________________________________________________________________

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