Rainbow-electronics MAX1706 Manual de usuario descargar pdf (Pagina 4)

MAX1705/MAX1706

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

Step-Up DC-DC Converters with Linear Regulator

4 _______________________________________________________________________________________

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.)

ELECTRICAL CHARACTERISTICS

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

= -40°C to +85°C, unless otherwise noted, Note 4.)

PARAMETER SYMBOL MIN TYP MAX UNITS

Minimum CLK/SEL Pulse

Internal Oscillator Frequency 260 300 340 kHz

200 ns

Maximum CLK/SEL

Rise/Fall Time

100 ns

CONDITIONS

CLK/SEL = OUT

Supply Current in

Low-Power Mode

OUT

190 µACLK/SEL = 0V, FB = FBLDO = 1.5V, no load

Supply Current in Shutdown I

OUT

20 µA

ONA = 0V, ONB = OUT, measure I

OUT

OUT Voltage in Track Mode

LDO

+ V

LDO

0.2 0.4

VTRACK = OUT, V

LDO

> 2.3V

250 570MAX1706

MAX1706

CLK/SEL = OUT

CLK/SEL = 0V

MAX1705

CLK/SEL = OUT

CLK/SEL = 0V

0.28

MAX1705

Switch On-Resistance

0.45

Ω

N-channel, I

= 100mA

550 950

N-Channel MOSFET

Current Limit

LIM

1000 1700

CLK/SEL = OUT

250 570

0.50

CLK/SEL = 0V

P-channel, I

= 100mA

PARAMETER SYMBOL MIN TYP MAX

P-Channel Synchronous-

Rectifier Turn-Off Current

UNITSCONDITIONS

20 120 mA

Start-Up to Normal Mode

Transition Voltage

2.0 2.3 V

FB Regulation Voltage 1.215 1.251 VCLK/SEL = OUT

Reference Output Voltage 1.235 1.265 VI

REF

= 0µA

Oscillator Maximum Duty Cycle 80 86 90 %

External Oscillator

Synchronization Range

200 400 kHz

Supply Current in

Low-Noise Mode

OUT

360 µA

CLK/SEL = OUT, V

= V

FBLDO

= 1.5V,

no load

DC-DC CONVERTER

REFERENCE

DC-DC CONVERTER

1 2 3 4 5 6 7 8 9 ... 19 20

MAX1705/MAX1706 1

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Rainbow-electronics MAX1706 Manual de usuario Pagina 4

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