Rainbow-electronics MAX1765 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX1765

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

with 500mA Linear Regulator

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS

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

DC-DC CONVERTER

FB Regulation Voltage V

CLK/SEL = OUT, 0 < I

< 0.55A

1.210 1.280

OUT Voltage in Track Mode V

OUTL

> 2.0V, INL = POUT

OUTL

+ 0.4

OUTL

+ 0.6

Startup to Normal Mode

Transition Voltage

Rising edge only (Note 2)

2.00 2.30

Supply Current in Normal Mode

(Note 3)

CLK/SEL = ONL = GND, no load

200

µA

Supply Current in

Low-Noise PWM Mode (Note 3

C LK/S E L = OU T, V

= 1.5V , no l oad

200

µA

Supply Current in Shutdown ONA = ONL = GND, ONB = OUT 10 µA

DC-DC SWITCHES

POUT Leakage Current V

= 0, V

OUT

= 5.5V 10 µA

LX Leakage Current V

= V

OUT

= V

ONB

= 5.5V, ONA = GND 10 µA

N-channel

0.28

Switch On-Resistance

P-channel

0.50

Ω

N - C hannel C ur r ent Li m i t ( N ote 4)

LIM

ISET

= 1.25V, CLK/SEL = GND or OUT

1000 1600

P-Channel Turn-Off Current CLK/SEL = GND 5

120

REFERENCE

Reference Output Voltage I

REF

= 0

1.225 1.275

LINEAR REGULATOR

Output Voltage in Internal

Feedback Mode

FBL = GND, I

OUTL

= 10mA

2.79 2.90

FBL Input Threshold

150 350

FBL Regulation Voltage FBL = OUTL, I

OUTL

= 10mA, I

REF

= 0

1.225 1.275

LDO Startup Voltage V

OUT

= 2V, rising edge only

2.15 2.45

Dropout Resistance V

FBL

= 1V, I

OUTL

= 500mA 0.5 Ω

INL Supply Current in Shutdown

OUTL = ONA = ONL = GND 10 µA

INL No-Load Supply Current I

OUTL

= 0, V

INL

= 5.5V

250

µA

1 2 3 4 5 6 7 8 9 10 ... 18 19

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