Rainbow-electronics MAX1706 Manual do Utilizador descarregar pdf (Página 3)

MAX1705/MAX1706

1- to 3-Cell, High-Current, Low-Noise,

Step-Up DC-DC Converters with Linear Regulator

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

OUT

= V

POUT

= V

LBP

= 3.6V, CLK/SEL = FB = LBN = LBO = ONA = ONB = TRACK = GND, REF = open (bypassed with 0.22µF),

LX = open, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

f = 300kHz

OUT

= 5.5V, CLK/SEL, TRACK

LBO

= V

OUT

= 5V

SINK

= 1mA, V

OUT

= 2.5V, LBP = GND,

LBN = OUT

1.2V < V

OUT

< 5.5V, ONA, ONB (Note 3)

OUT

= 2.5V, CLK/SEL, TRACK

LBN

= VLBP = 1V

LBN

= 0.5V and 1.5V (at least one input must

be within this range)

Hysteresis approximately 10°C

LBP falling

1.2V < V

OUT

< 5.5V, ONA, ONB (Note 3)

LBP rising

CONDITIONS

µA1

Input Leakage Current

(CLK/SEL, ONA, ONB, TRACK)

0.8V

OUT

0.8V

OUT

Input High Level

0.2V

OUT

0.2V

OUT

Input Low Level

dB38AC Power-Supply Rejection

µA1LBO High Leakage

V0.4LBO Output Low Voltage

nA0.01 50LBN, LBP Input Current

V0.5 1.5

LBN, LBP Common-Mode

Input Range

°C155Thermal Shutdown

mV-5 5LBN, LBP Offset

mV16LBN, LBP Hysteresis

UNITSMIN TYP MAXSYMBOLPARAMETER

mA20 70 120

P-Channel Synchronous-

Rectifier Turn-Off Current

= 0V, V

ONB

= V

OUT

= 5.5V µA0.1 20POUT Leakage Current

CLK/SEL = GND

250 435 550

CLK/SEL = OUT

1000 1280 1550

LIM

N-Channel MOSFET

Current Limit

550 750 950

MAX1705

MAX1706

MAX1706 250 435 550

FBLDO = LDO, I

LOAD

= 1mA V1.238 1.250 1.262FBLDO Regulation Voltage

FBLDO

= 1.5V nA0.01 50FBLDO Input Current

FBLDO = GND mA220 300 500Short-Circuit Current Limit

FBLDO

= 1V, I

LDO

= 200mA

Ω

0.5 1.2Dropout Resistance

10µA < I

LDO

< 200mA, FBLDO = LDO %0.4 1.2Load Regulation

2.5V < V

OUT

< 5.5V, FBLDO = LDO,

LDO

= 1mA

%0.1 0.5Line Regulation

P-channel, I

= 100mA 0.27 0.50

N-channel, I

= 100mA

Ω

0.23 0.45

Switch On-Resistance

0.16 0.28

CLK/SEL = GND

CLK/SEL = OUT

= 0V, V

ONB

= V

OUT

= 5.5V µA0.1 20LX Leakage Current

V1.25 5.0LDO Adjust Range

CONTROL INPUTS

LOW-BATTERY COMPARATOR

LINEAR REGULATOR

DC-DC SWITCHES

1 2 3 4 5 6 7 8 ... 19 20

MAX1705/MAX1706 1

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