Rainbow-electronics MAX1855 Manual de usuario descargar pdf (Pagina 5)

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = +15V, V

= V

= 5V, SKIP = V

, VPS = PGND, T

= -40°C to +85°C, unless otherwise noted.) (Note 6)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PWM CONTROLLER

Battery voltage, V+ 2 28

Input Voltage Range

, V

4.5 5.5

DAC codes from

1.35V to 2.0V

-1.6 1.6

DC Output Voltage Accuracy

(Notes 2, 3)

V+ = 4.5V to 28V,

VPS = PGND

DAC codes from

0.6V to 1.3V

-2 2

FB Input Bias Current I

FB = 0.6V to 2.0V -0.2 0.2 µA

VPS Input Bias Current I

VPS

= ±40mV -1 1 µA

VPS Gain A

VPS

= 0 or -40mV, gain from VPS to FB 0.153 0.197 %/mV

CS Input Bias Current I

0 to 28V -1 1 µA

ILIM Input Leakage Current I

ILIM

= 0 or 5.0V 100 nA

TON = GND 205 300

TON = REF 280 375

TON = open 425 520

On-Time (Note 4) t

V+ = 11.0V,

= 1.5V

TON = V

615 740

Minimum Off-Time (Note 4) t

OFF

(

M IN

)

500 ns

BIAS AND REFERENCE

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

950 µA

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

5 µA

Quiescent Supply Current (V+) I+ 40 µA

Shutdown Supply Current (V

) SHDN = GND 5 µA

Shutdown Supply Current (V

) SHDN = GND 5 µA

Shutdown Supply Current (V+) S HDN = GN D , V + = 28V , V

C C

= V

D D

= 0 or 5V 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, no external REF load 1.98 2.02 V

Reference Load Regulation I

REF

= 0 to 50µA 0.01 V

REF Sink Current I

REF

REF in regulation 10 µA

FAULT PROTECTION

MAX1716 1.8 2.0 V

Output Overvoltage Fault

Threshold (Note 5)

Measured at FB

MAX1855 1.97 2.03

Output Undervoltage Fault

Threshold (Foldback)

35 45 %

Output Undervoltage Fault

Blanking Time (Foldback)

From SHDN signal going high 10 30 ms

1 2 3 4 5 6 7 8 9 10 ... 32 33

MAX1716/MAX1854/MAX1855 1

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Rainbow-electronics MAX1855 Manual de usuario Pagina 5

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