Rainbow-electronics MAX1638 Manual do Utilizador descarregar pdf (Página 4)

MAX1638

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

4 _______________________________________________________________________________________

FREQ = REF

FREQ = V

Falling FB, 1% hysteresis with respect to V

REF

Rising FB, 1% hysteresis with respect to V

REF

FREQ = AGND

Over line and load (Note 1)

= V

CONDITIONS

510 600 690

800 1000 1200

Switching Frequency

6 8 10

kHz

240 300 360

-8 -6 -4

PWROK Trip Level

%±2.5Output Voltage (FB) Accuracy

V4.5 5.5Input Voltage Range

UNITSMIN TYP MAXPARAMETER

BST - LX = 4.5V

FREQ = V

= 4.5V

Ω0.7 2

%84 90

Ω0.7 2

Maximum Duty Cycle

DL On-Resistance

DH On-Resistance

FB = 3.5VCurrent-Limit Trip Voltage mV70 100 130

ELECTRICAL CHARACTERISTICS

= V

= D4 = +5V, PGND = AGND = D0–D3= 0V, FREQ = REF, T

= -40°C to +85°C, unless otherwise noted.) (Note 3)

Note 1: FB accuracy is 100% tested at FB = 3.5V (code 10000) with V

= V

= 4.5V to 5.5V and CSH - CSL = 0mV to 80mV. The

other DAC codes are tested with V

= V

= 5V and CSH - CSL = 0.

Note 2: AC load regulation sets the AC loop gain, to make tradeoffs between output filter capacitor size and transient response,

and has only a slight effect on DC accuracy or DC load-regulation error.

Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

No load V3.448 3.5 3.553Reference Voltage

rising edge, 1% hysteresis V3.9 4.3Input Undervoltage Lockout

0.4

Operating mode 3

Supply Current

= V

= 5.5V, FB forced 200mV above

regulation point, operating or shutdown mode

mA0.2

= V

= 5.5V,

FB overdrive =

200mV

Supply Current

Shutdown

mode

REF

= 0V

DAC code = 11111

1 2 3 4 5 6 7 8 9 ... 15 16

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