Rainbow-electronics MAX1791 Manual de usuario descargar pdf (Pagina 4)

MAX1762/MAX1791

High-Efficiency, 10-Pin µMAX, Step-Down

Controllers for Notebooks

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= 15V, VL enabled, C

= 1µF, C

REF

= 0.1µF, T

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VP Input Voltage Range V

520V

VL Input Voltage Range V

VL (overdriven) 4.75 5.25 V

OUT Output Voltage

(MAX1762, 1.8V Fixed)

OUT

= 5V to 20V, V

= 4.75V to 5.25V,

FB = GND, continuous conduction mode

1.773 1.827 V

OUT Output Voltage

(MAX1762, 2.5V Fixed)

OUT

= 5V to 20V, V

= 4.75V to 5.25V,

FB = VL, continuous conduction mode

2.463 2.538 V

OUT Output Voltage

(MAX1791, 3.3V Fixed)

OUT

= 5V to 20V, V

= 4.75V to 5.25V,

FB = GND, continuous conduction mode

3.250 3.350 V

OUT Output Voltage

(MAX1791, 5V Fixed)

OUT

= 7V to 20V, V

= 4.75V to 5.25V,

FB = VL, continuous conduction mode

4.925 5.075 V

OUT Output Voltage (adj Mode)

= 5V to 20V, V

= 4.75V to 5.25V,

FB = OUT, continuous conduction mode

1.231 1.269 V

FB Input Bias Current V

= 1.3V -0.2 0.2 µA

OUT

= 1.25V, V

= 6V 666 814

On-Time (Note 2) t

OUT

= 5V, V

= 6V 2550 3110

Minimum Off-Time (Note 2) t

OFF

250 550 ns

VL Quiescent Supply Current

FB = GND, V

= 5V, OUT forced above the

regulation point

260 µA

V L

= float 410

VP Quiescent Supply Current

FB = GND, OUT forced above

the regulation point V

= 20V

V L

= 5V 200

µA

VL Shutdown Supply Current V

= 5V, SHDN = GND 15 µA

VP Shutdown Supply Current S HD N = GN D , m easur ed at V P , V

V L

= 0 or 5V 12 µA

VL Output Voltage I

LOAD

= 0 to 25mA, V

= 5V to 20V 4.5 4.75 V

Reference Voltage V

= 4.75V to 5.25V, no load 1.98 2.02 V

Reference Load Regulation I

REF

= 0 to 50µA 0.01 V

REF Sink Current REF in regulation 10 µA

Output Undervoltage Threshold

(Foldback)

With respect to regulation point, no load 60 80 %

Output Undervoltage Lockout

Time (Foldback)

From SHDN signal going high, V

OUT

< 0.6 x

regulation point

10 42 ms

Current-Limit Threshold V

ILIM

-90 -110 mV

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

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics MAX1791 Manual de usuario Pagina 4

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics MAX1791