Rainbow-electronics MAX1625 Manual de usuario descargar pdf (Pagina 4)

MAX1624/MAX1625

High-Speed Step-Down Controllers with

Synchronous Rectification for CPU Power

4 _______________________________________________________________________________________

FREQ

= 33.3kΩ

FREQ

= 20kΩ

= V

= 5.5V,

FB overdrive = 200mV

Falling FB, 1% hysteresis with respect to V

REF

rising edge, 1% hysteresis

Rising FB, 1% hysteresis with respect to V

REF

= V

FREQ

= 200kΩ

Operating mode

= V

= 5.5V, FB overdrive = 200mV,

operating or standby mode

MAX1624, over line and load

No load

CONDITIONS

510 600 690

Standby mode

800 1000 1200

Switching Frequency

6 8 10

kHz

80 100 120

-8 -6 -4

PWROK Trip Level

±2.5

Supply Current

V3.9 4.3

V4.5 5.5Input Voltage Range

Input Undervoltage Lockout

%±2.5FB Accuracy

0.4

mA0.2V

Supply Current

V3.447 3.5 3.553Reference Voltage

UNITSMIN TYP MAXPARAMETER

MAX1625FB Set Voltage

BST - LX = 4.5V

FREQ

= 20kΩ

= 4.5V

Ω0.7 2

%84 90

Ω0.7 2

Maximum Duty Cycle

DL On-Resistance

DH On-Resistance

Current-Limit Trip Voltage mV70 100 130

ELECTRICAL CHARACTERISTICS

= V

= D4 = +5V, PGND = AGND = D0–D3= 0V, R

FREQ

= 33.3kΩ, T

= -40°C to +85°C, unless otherwise noted.) (Note 4)

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 at the major transition points with V

= V

= 5V and CSH - CSL = 0. FB accuracy at other

DAC codes over line and load is guaranteed by design.

Note 2: FB set voltage is 100% tested with V

= V

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

Note 3: 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 4: Specifications from 0°C to -40°C are not production tested.

1 2 3 4 5 6 7 8 9 ... 23 24

MAX1624/MAX1625 1

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Rainbow-electronics MAX1625 Manual de usuario Pagina 4

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