Rainbow-electronics MAX1734 Manual de usuario descargar pdf (Pagina 3)

MAX1733/MAX1734

Low-Voltage, Step-Down DC-DC Converters

in SOT23

_______________________________________________________________________________________ 3

Note 1: All devices are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed by design.

ELECTRICAL CHARACTERISTICS

= +2.7V to +5.5V, SHDN = IN, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Input Voltage Range V

2.7 5.5 V

Startup Voltage V

START

2.0 V

rising, 200mV typical hysteresis 1.95

UVLO Threshold V

UVLO

falling 1.55

Quiescent Supply Current I

No switching (FB/OUT above trip point) 70 µA

Shutdown Supply Current I

SHDN

SHDN = GND 4 µA

Outp ut V ol tag e Range ( MAX 1733) V

OUT

1.25 2.0 V

Output Voltage Accuracy

(MAX1734)

OUT

= 0 to 250mA -3 +3 %

OUT Sense Current (MAX1734) I

OUT

= V

REG

, V

= V

SHDN

= 5V 8 µA

FB Feedback Threshold

(MAX1733)

= 3.6V 1.210 1.280 V

FB Leakage Current (MAX1733) I

= 1.5V 0.2 µA

SHDN Input High Voltage V

2.7V < V

< 5.5V 1.6 V

SHDN Input Low Voltage V

2.7V < V

< 5.5V 0.4 V

SHDN Leakage Current I

SHDN

SHDN = GND or IN 1 µA

High-Side Current Limit I

LIMP

300 565 mA

Low-Side Current Limit I

LIMN

200 430 mA

= -50mA, V

= 3.0V 1.4

High-Side On-Resistance R

ONP

= -50mA, V

= 5.5V 1.1

Ω

= -50mA, V

= 3.0V 2

Rectifier On-Resistance R

ONN

= -50mA, V

= 5.5V 1.6

Ω

LX Leakage Current I

LXLEAK

= 5.5V, V

= 0 to V

5 µA

LX Reverse Leakage Current I

LXLK

IN unconnected, V

= 5.5V, SHDN = GND 5 µA

Minimum On-Time t

(

MIN

)

0.25 0.55 µs

Minimum Off-Time

OFF( M IN)

0.25 0.55 µs

1 2 3 4 5 6 7 8

MAX1733/MAX1734 1

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Rainbow-electronics MAX1734 Manual de usuario Pagina 3

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