MAX8668 查看數據表（PDF） - Maxim Integrated
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MAX8668 Datasheet PDF : 18 Pages
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1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
ABSOLUTE MAXIMUM RATINGS
IN12, IN34, FB1, FB2, EN1, EN2, EN3, EN4, OUT1,
OUT2, REF to GND............................................-0.3V to +6.0V
OUT3,
OUT4 to GND.....-0.3V to the lesser of + 6V or (VIN34 + 0.3V)
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
LX1, LX2 Current ..........................................................1.5A RMS
LX1, LX2 to GND (Note 1) .......................-0.3V to (VIN12 + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin, 3mm x 3mm Thin QFN
(derate 20.8mW/°C above +70°C) .............................1667mW
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 IN12. Applications that forward bias these diodes should take care not to exceed
the IC’s package-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
(VIN34 = VIN12 = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
IN34 Supply Range
IN12 Supply Range
IN12 Suppy Range
Shutdown Supply Current,
IIN12 + IIN34
No Load Supply Current,
IIN12 + IIN34
UNDERVOLTAGE LOCKOUT
IN12 UVLO
IN34 UVLO
THERMAL SHUTDOWN
Threshold
Hysteresis
REFERENCE
Reference Bypass Output
Voltage
REF Supply Rejection
LOGIC AND CONTROL INPUTS
CONDITIONS
VIN12 ≥ VIN34
MAX8668, VIN12 ≥ VIN34
MAX8667, VIN12 ≥ VIN34
VIN12 = VIN34 = 4.2V VEN_ = 0V
TA = +25°C
TA = +85°C
MAX8667ETEJS+, all regulators enabled
VIN12 rising
VIN12 hysteresis
VIN34 rising
VIN34 hysteresis
TA rising
2.6V ≤ (VIN12 = VIN34) ≤ 5.5V
MIN TYP
1.7
2.6
2.8
0.05
100
2.4
2.5
0.1
1.5
1.6
0.1
+160
15
0.591
0.600
0.15
EN_ Input Low Level
EN_ Input High Level
EN_ Input Leakage Current
STEP-DOWN CONVERTERS
Minimum Adjustable Output
Voltage
1.7V ≤ VIN34 ≤ 5.5V
2.6V ≤ VIN12 ≤ 5.5V
1.7V ≤ VIN34 ≤ 5.5V
2.6V ≤ VIN12 ≤ 5.5V
VIN12 = VIN34 = 5.5V
MAX8668
TA = +25°C
TA = +85°C
1.44
-1
0.001
0.6
MAX
5.5
5.5
5.5
1
150
2.6
1.7
0.609
0.4
+1
UNITS
V
V
V
µA
µA
µA
V
V
V
V
°C
°C
V
mV/V
V
V
µA
V
2 _______________________________________________________________________________________
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