MAX8643 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8643 Datasheet PDF : 16 Pages
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3A, 2MHz Step-Down Regulator
with Integrated Switches
ABSOLUTE MAXIMUM RATINGS
IN, VDD, PWRGD to GND ......................................-0.3V to +4.5V
COMP, FB, REFIN, OUT,
CTL_, EN, SS, FREQ to GND...................-0.3V to (VDD + 0.3V)
LX Current (Note 1) .....................................................-4A to +4A
BST to LX..................................................................-0.3V to +4V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
24-Pin TQFN-EP
(derated 27.8mW/°C above +70°C)........................2222.2mW
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
Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation limits.
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
(VIN = VDD = 3.3V, VFB = 0.5V, TA = -40°C to +85°C. Typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)
PARAMETER
IN/VDD
IN and VDD Voltage Range
IN Supply Current
VDD Supply Current
Total Shutdown Current from IN
and VDD
VDD Undervoltage Lockout
Threshold
BST
BST Supply Current
PWM COMPARATOR
PWM Comparator Propagation
Delay
COMP
COMP Clamp Voltage, High
COMP Slew Rate
PWM Ramp Amplitude
COMP Shutdown Resistance
ERROR AMPLIFIER
CONDITIONS
fS = 1MHz, no load (includes
gate-drive current)
fS = 1MHz
VIN = 2.5V
VIN = 3.3V
VIN = 2.5V
VIN = 3.3V
VIN = VDD = VBST - VLX = 3.6V, VEN = 0V
LX starts/stops switching
VDD rising
VDD falling
Deglitching
VBST = VDD = VIN = 3.6V,
VLX = 3.6V or 0V, VEN = 0V
TA = +25°C
TA = +85°C
10mV overdrive
VIN = 2.35V to 3.6V
From COMP to GND, VEN = VSS = 0V
Preset Output-Voltage Accuracy REFIN = SS
FB Regulation Accuracy Using
External Resistors
FB to OUT Resistor
CTL1 = CTL2 = GND
All VID settings except CTL1 = CTL2 = GND
MIN TYP MAX UNITS
2.35
3.60
V
4
4.6
mA
5.5
1.4
2.3
mA
2
13
µA
2
2.1
V
1.8
1.9
2
µs
5
µA
10
20
ns
2
V
1.4
V/µs
1
V
8
Ω
Select
-1
from +1
%
Table 1
0.594 0.600 0.606
V
5
8
11
kΩ
2 _______________________________________________________________________________________
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