MAX8742(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8742
(Rev.:2004)

500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown

Maxim Integrated 

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 6)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

V+ Standby Supply Current

V+ = 5.5V to 30V, both SMPSs off, includes

current into SHDN

60

µA

V+ Standby Supply Current in Dropout

V+ Shutdown Supply Current

V+ = 4.2V to 5.5V, both SMPSs off, includes

current into SHDN

V+ = 4.0V to 30V, SHDN = 0

200

µA

10

µA

Quiescent Power Consumption

Both SMPSs enabled,

FB3 = FB5 = 0,

CSL3 = CSH3 = 3.5V,

CSL5 = CSH5 = 5.3V

MAX8742

MAX8741

4

mW

4

FAULT DETECTION

Overvoltage Trip Threshold

Output Undervoltage Threshold

Output Undervoltage-Lockout Time

RESET

RESET Trip Threshold

RESET Delay Time

INPUTS AND OUTPUTS

Feedback-Input Leakage Current

Logic Input-Low Voltage

Logic Input-High Voltage

Logic Output-Low Voltage

Logic Output-High Current

TIME/ON5 Input Trip Level

TIME/ON5 Source Current

TIME/ON5 On-Resistance

Gate-Driver On-Resistance

With respect to unloaded output voltage

With respect to unloaded output voltage

From each SMPS enabled, with respect to

fOSC

4

60

3300

With respect to unloaded output voltage,

falling edge; typical hysteresis = 1%

With respect to fOSC

FB3, FB5; SECFB = 2.6V

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

RESET, ISINK = 4mA

RESET = 3.5V

SEQ = 0 or VL

TIME/ON5 = 0, SEQ = 0 or VL

TIME/ON5; RUN/ON3 = 0, SEQ = 0 or VL

High or low (Note 5)

SSOP package

QFN package

-7

27,000

2.4

1

2.4

2.5

10

%

80

%

4700 Clks

-4

%

37,000 Clks

50

nA

0.6

V

V

0.4

V

mA

2.6

V

3.5

µA

80

Ω

7

Ω

8

Note 1: Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments.

Note 2: High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating frequency

(see the Dropout Operation section).

Note 3: Off mode for the MAX8742 12V linear regulator occurs when the SMPS that has flyback feedback (VDD) steered to it is disabled.

In situations where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator prevents

a leakage path from the output-referred flyback winding, through the rectifier, and into VDD.

Note 4: Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant.

Note 5: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the thin

QFN package. The SSOP and thin QFN packages contain the same die, and the thin QFN package imposes no additional

resistance in circuit.

Note 6: Specifications from 0°C to -40°C are guaranteed by design, not production tested.

6 _______________________________________________________________________________________

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