Rainbow-electronics MAX1636 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1636

Low-Voltage, Precision Step-Down

Controller for Portable CPU Power

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ELECTRICAL CHARACTERISTICS (continued)

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

, I

= 0mA, I

REF

= 0mA, T

= 0°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C.)

FB to DL delay, 22mV overdrive, C

GATE

= 2000pF

SHDN = GND, OVP = V

FB, with respect to regulation point

= 5V, I(VL) = 0, V+ = 4.5V

(includes PNP base current)

= 5V, I(VL) = 0

Guaranteed by design

SYNC = V

SYNC = GND

SYNC = V

I(VL) = 0 to 25mA, 5V < V+ < 30V

I(VL) = 0 to 25mA, 6V < V+ < 30V

Rising edge, hysteresis = 25mV

SYNC = GND

REF load = 0 to 50µA

SYNC = GND

°C

150

µs

1.25

4 7 10

kHz

240 340

SYNC Input Frequency Range

200

SYNC Input Rise/Fall Time

200

SYNC Input Pulse Width Low

200

Maximum Duty Factor, Dropout Mode

98 99

93 96

µA

Standby Supply Current (V+)

µA

500

Regulator Supply Current (V+)

91 94

170 200 230

270 300 330

kHz

4.5 5.0 5.3

4.7 5.0 5.3

VL Output Voltage

3.15

VL/ V

Switchover Threshold

REF Load Regulation

Hysteresis = 10°C

Rising edge, hysteresis = 25mV V

3.45 3.60 3.75

VL Undervoltage Lockout Threshold

No REF load V

1.090 1.100 1.110

REF Output Voltage

= 3.3V to 5.5V mV

REF Line Regulation

Oscillator Frequency

nsSYNC Input Pulse Width High

Maximum Duty Factor

Overvoltage Trip Threshold

Thermal Shutdown Threshold

Overvoltage Fault Propagation Delay

Pin at GND or V

; SKIP, OVP, SYNC

SHDN, SKIP, OVP, SYNC

Falling edge (hysteresis = 1%)

From shutdown or power-on-reset state

% of nominal output

0.4

RESET Output Voltage Low

µA

-1 1

0.8

2.4

Logic Input Voltage High

clks

Catastrophic Output Undervoltage

Lockout Delay

Logic Input Voltage Low

Logic Input Bias Current

clks

32768

RESET Delay Time

-6 -3

RESET Trip Threshold

6144

Catastrophic Output Undervoltage

Lockout Threshold

60 70 80

SINK

= 4mA

+5.5V stress voltage applied µA

RESET Output Leakage Current

CONDITIONS UNITSMIN TYP MAXPARAMETER

SHDN = GND or V+

µA

-3 3

SHDN Input Bias Current

INTERNAL VL REGULATOR AND REFERENCE

OSCILLATOR

OVERVOLTAGE PROTECTION

INPUTS AND OUTPUTS

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

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