MAX1875A Просмотр технического описания (PDF) - Maxim Integrated

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MAX1875A

Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR

Maxim Integrated 

Dual 180° Out-of-Phase Buck Controllers with

Sequencing/Prebias Startup and POR

ABSOLUTE MAXIMUM RATINGS

V+ to GND ..............................................................-0.3V to +25V

PGND to GND .......................................................-0.3V to +0.3V

VL to GND ..................-0.3V to the lower of +6V and (V+ + 0.3V)

BST1, BST2 to GND ...............................................-0.3V to +30V

LX1 to BST1..............................................................-6V to +0.3V

LX2 to BST2..............................................................-6V to +0.3V

DH1 to LX1 ..............................................-0.3V to (VBST1 + 0.3V)

DH2 to LX2 ..............................................-0.3V to (VBST2 + 0.3V)

DL1, DL2 to PGND........................................-0.3V to (VL + 0.3V)

CKO, REF, OSC, ILIM1, ILIM2,

COMP1, COMP2 to GND ..........................-0.3V to (VL + 0.3V)

FB1, FB2, RST, SYNC, EN to GND...........................-0.3V to +6V

VL to GND Short Circuit .............................................Continuous

REF to GND Short Circuit ...........................................Continuous

Continuous Power Dissipation (TA = +70°C)

24-Pin QSOP (derate 9.4mW/°C above +70°C)...........762mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V+ = 12V, EN = ILIM_ = VL, SYNC = GND, IVL = 0mA, PGND = GND, CREF = 0.22µF, CVL = 4.7µF (ceramic), ROSC = 60kΩ,

compensation components for COMP_ are from Figure 1, TA = -40°C to +85°C (Note 1), unless otherwise noted.)

PARAMETER

GENERAL

V+ Operating Range

V+ Operating Supply Current

V+ Standby Supply Current

Thermal Shutdown

Current-Limit Threshold

VL REGULATOR

Output Voltage

VL Undervoltage Lockout Rising

Trip Level

CONDITIONS

(Note 2)

VL = V+ (Note 2)

VL unloaded, no MOSFETs connected

EN = LX_ = FB_ = 0V

Rising temperature, typical hysteresis = 10°C

ILIM_ = VL

PGND - LX_

RILIM_ = 100kΩ

RILIM_ = 600kΩ

5.5V < V+ < 23V, 1mA < ILOAD < 50mA

MIN TYP MAX UNITS

4.5

23.0

V

4.5

5.5

3.5

6

mA

0.3

0.6

mA

+160

°C

75

100 125

32

50

62

mV

225 300 375

4.75

5

5.25

V

4.1

4.2

4.3

V

VL Undervoltage Lockout

Hysteresis

REFERENCE

Output Voltage

Reference Load Regulation

SOFT-START

Digital Ramp Period

Soft-Start Steps

FREQUENCY

Low End of Range

High End of Range

DH_ Minimum Off-Time

(Note 3)

100

mV

IREF = 0µA

0µA < IREF < 50µA

1.98 2.00 2.02

V

0

4

10

mV

Internal 6-bit DAC for one converter to ramp from 0V to

full scale (Note 4)

1024

64

DC-DC

clocks

Steps

ROSC = 60kΩ

ROSC = 10kΩ

ROSC = 10kΩ

0°C to +85°C

-40°C to +85°C

84

100 115

kHz

80

100 120

540 600 660

kHz

250 303

ns

2 _______________________________________________________________________________________

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