MAX1945R 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1945R

1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators

Maxim Integrated 

1MHz, 1% Accurate, 6A Internal Switch

Step-Down Regulators

ABSOLUTE MAXIMUM RATINGS

CTL1, CTL2, IN, SYNC, VCC, VDD to GND ...............-0.3V to +6V

SYNCOUT, COMP, FB, FBSEL,

REF to GND ............................................-0.3V to (VCC + 0.3V)

LX Current (Note 1) .....................................................-9A to +9A

BST to LX..................................................................-0.3V to +6V

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

Continuous Power Dissipation (TA = +85°C)

(derate 23.8mW/°C above +70°C) .............................1191mW

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

Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed

the IC’s package power dissipation limits.

ELECTRICAL CHARACTERISTICS

(VIN = VCC = VCTL1 = VCTL2 = VDD = 3.3V, SYNC = GND, FBSEL = High-Z, VFB = 0.7V, CREF = 0.22µF, TA = 0°C to +85°C, unless

otherwise noted. Typical values are at +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

IN/VCC

Input Voltage

IN Supply Current

VCC Supply Current

VDD Supply Current

VIN

IIN

SYNC = VCC (1MHz),

no load

ICC

SYNC = VCC (1MHz)

IDD

SYNC = VCC (1MHz)

2.6

5.5

V

VIN = 3.3V

VIN = 5.5V

12

20

mA

48

VCC = 3.3V

VCC = 5.5V

2

3

mA

3

VDD = 3.3V

VDD = 5.5V

5

8

mA

10

Total Shutdown Current from IN,

VCC, and VDD

ITOTAL

VIN = VCC = VDD = VBST - VLX = 5.5V,

CTL1 = CTL2 = GND

500

µA

VCC Undervoltage Lockout

Threshold

VDD

VDD Shutdown Supply Current

VUVLO

When LX starts/stops

switching

VCC rising

2.40 2.55

V

VCC falling

2.20 2.35

VIN = VDD = VBST = 5.5V, VLX = 5.5V or 0,

CTL1 = CTL2 = GND

10

µA

BST

BST Shutdown Supply Current

IBST

VIN = VDD = VBST = 5.5V, VLX = 5.5V or 0,

CTL1 = CTL2 = GND

10

µA

REF

REF Voltage

REF Shutdown Resistance

COMP

COMP Transconductance

VREF

IREF = 0, VIN = 2.6V to 5.5V

From REF to GND, CTL1 = CTL2 = GND

1.97 2.00 2.04

V

10

100

Ω

From FB to COMP,

VCOMP = 1.25V

FBSEL = High-Z 30

55

85

FBSEL = GND 13.3 24.4 37.8

µS

FBSEL = VCC

9.6 17.6 27.2

COMP Clamp Voltage Low

VLOW_

CLAMP

VIN = 2.6V to 5.5V, VFB = 0.9V

0.5

0.8

1.1

V

COMP Clamp Voltage High

COMP Shutdown Resistance

VHIGH_

CLAMP

VIN = 2.6V to 5.5V, VFB = 0.7V

1.90 2.15 2.40

V

From COMP to GND, CTL1 = CTL2 = GND

10

100

Ω

2 _______________________________________________________________________________________

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