Rainbow-electronics MAX1636 Manual do Utilizador descarregar pdf (Página 5)

MAX1636

Low-Voltage, Precision Step-Down

Controller for Portable CPU Power

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

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

, I

= 0mA, I

REF

= 0mA, T

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

FB, with respect to regulation point

Guaranteed by design

SYNC = GND

SYNC = V

3.5 10

Oscillator Frequency

nsSYNC Input Pulse Width High

Overvoltage Trip Threshold

kHz

240 340

SYNC Input Frequency Range

200

SYNC Input Rise/Fall Time

200

SYNC Input Pulse Width Low

SHDN, SKIP, OVP, SYNC

200

Falling edge (hysteresis = 1%)

% of nominal output

0.4

RESET Output Voltage Low

0.8

170 230

2.4

270 330

Logic Input Voltage High

kHz

Logic Input Voltage Low

-7 -1.5

RESET Trip Threshold

Catastrophic Output Undervoltage

Lockout Threshold

60 80

SINK

= 4mA

High or low, DH or DL Ω

Gate-Driver On-Resistance

CONDITIONS UNITSMIN TYP MAXPARAMETER

OSCILLATOR

OVERVOLTAGE PROTECTION

INPUTS AND OUTPUTS

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, V

= 7V, T

= +25°C, unless otherwise noted.)

100

1m 100m 110m 10

EFFICIENCY vs. LOAD CURRENT

(3.3V/3A CIRCUIT)

MAX1636 TOC01

LOAD CURRENT (A)

EFFICIENCY (%)

= 22V

= 30V

= 7V

= 15V

100

1m 100m 110m 10

EFFICIENCY vs. LOAD CURRENT

(5V/3A CIRCUIT)

MAX1636 TOC02

LOAD CURRENT (A)

EFFICIENCY (%)

= 22V

= 7V

= 15V

= 30V

100

1m 100m 110m 10

EFFICIENCY vs. LOAD CURRENT

(1.8V/1A CIRCUIT)

MAX1636 TOC03

LOAD CURRENT (A)

EFFICIENCY (%)

= 15V

= 7V

= 22V

Note 1: Specifications to -40°C are guaranteed by design and not production tested.

1 2 3 4 5 6 7 8 9 10 ... 22 23

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