MAX799 查看數據表（PDF） - Maxim Integrated

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MAX799

Step-Down Controllers with Synchronous Rectifier for CPU Power

Maxim Integrated 

Step-Down Controllers with

Synchronous Rectifier for CPU Power

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, GND = PGND = 0V, IVL = IREF = 0A, TA = -40°C to +85°C for MAX79_E, unless otherwise noted.) (Note 3)

PARAMETER

CONDITIONS

+3.3V and +5V STEP-DOWN CONTROLLERS

Input Supply Range

5V Output Voltage (CSL)

0mV < (CSH - CSL) < 80mV, FB = VL, 6V < V+ < 30V,

includes line and load regulation

MIN TYP MAX

5.0

30

4.70 5.10 5.40

3.3V Output Voltage (CSL)

0mV < (CSH - CSL) < 80mV, FB = VL, 4.5V < V+ < 30V,

includes line and load regulation

3.10 3.35 3.56

Nominal Adjustable Output

Voltage Range

External resistor divider

Feedback Voltage

(CSH-CSL) = 0V

Line Regulation

6V < V+ < 30V

Current-Limit Voltage

CSH - CSL, positive

CSH - CSL, negative

FLYBACK/PWM CONTROLLER

SECFB Regulation Setpoint

Falling edge, hysteresis = 15mV (MAX796)

Falling edge, hysteresis = 20mV (MAX799)

INTERNAL REGULATOR AND REFERENCE

VL Output Voltage

SHDN = 2V, 0mA < IVL < 25mA, 5.5V < V+ < 30V

VL Fault Lockout Voltage

Rising edge, hysteresis = 15mV

VL/CSL Switchover Voltage

Rising edge, hysteresis = 25mV

Reference Output Voltage

No external load (Note 1)

Reference Load Regulation

V+ Shutdown Current

0µA < IREF < 100µA

SHDN = 0V, V+ = 30V, CSL = 0V or 6V

V+ Off-State Leakage Current FB = CSH = CSL = 6V, VL switched over to CSL

Quiescent Power Consumption

OSCILLATOR AND INPUTS/OUTPUTS

Oscillator Frequency

SYNC = REF

SYNC = 0V or 5V

SYNC High Pulse Width

SYNC Low Pulse Width

Oscillator Sync Range

Maximum Duty Cycle

SYNC = REF

SYNC = 0V or 5V

DL On-Resistance

High or low

DH On-Resistance

High or low, BST - LX = 4.5V

REF

6.0

2.40

2.60

0.04 0.06

70

130

-40 -100 -160

2.40

2.60

-0.08

0.08

4.7

5.3

3.75

4.05

4.2

4.7

2.43 2.505 2.57

50

1

10

1

10

4.8

8.4

250

300

350

120

150

180

250

250

210

320

89

91

93

96

7

7

UNITS

V

V

V

V

V

%/V

mV

V

V

V

V

V

mV

µA

µA

mW

kHz

ns

ns

kHz

%

Ω

Ω

Note 3: All -40°C to +85°C specifications above are guaranteed by design.

4 _______________________________________________________________________________________

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