DC-DC Converters. MAX8668 Datasheet

MAX8668 Converters. Datasheet pdf. Equivalent

Part MAX8668
Description First Dual Step-Down DC-DC Converters
Feature MAX8667/MAX8668 19-0784; Rev 1; 7/07 EVAALVUAAILTAIOBNLEKIT 1.5MHz Dual Step-Down DC-DC Converters .
Manufacture Maxim Integrated Products
Datasheet
Download MAX8668 Datasheet




MAX8668
19-0784; Rev 1; 7/07
EVAALVUAAILTAIOBNLEKIT
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
General Description
The MAX8667/MAX8668 dual step-down converters
with dual low-dropout (LDO) linear regulators are
intended to power low-voltage microprocessors or
DSPs in portable devices. They feature high efficiency
with small external component size. The step-down
converters are adjustable from 0.6V to 3.3V (MAX8668)
or factory preset (MAX8667) with guaranteed output
current of 600mA for OUT1 and 1200mA for OUT2. The
1.5MHz hysteretic-PWM control scheme allows for tiny
external components and reduces no-load operating
current to 100µA with all outputs enabled. Dual low-qui-
escent-current, low-noise LDOs operate down to 1.7V
supply voltage. The MAX8667/MAX8668 have individ-
ual enables for each output, maximizing flexibility.
The MAX8667/MAX8668 are available in the space-
saving, 3mm x 3mm, 16-pin thin QFN package.
Applications
Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
Typical Operating Circuit
Features
o Tiny, Thin QFN 3mm x 3mm Package
o Individual Enables
o Step-Down Converters
600mA Guaranteed Output Current on OUT1
1200mA Guaranteed Output Current on OUT2
Tiny Size 2.2µH Chip Inductor (0805)
Output Voltage from 0.6V to 3.3V (MAX8668)
Ultra-Fast Line and Load Transients
Low 25µA Supply Current Each
o LDOs
300mA Guaranteed
Low 1.7V Minimum Supply Voltage
Low Output Noise
Ordering Information
PART
PKG CODE
TOP MARK
MAX8667ETEAA+
T1633-4
AEQ
MAX8667ETEAB+
T1633-4
AFI
MAX8667ETEAC+
T1633-4
AFM
MAX8667ETECQ+
T1633-4
AFN
Note: All MAX8667/MAX8668 parts are in a 16-pin, thin QFN,
3mm x 3mm package and operate in the -40°C to +85°C
extended temperature range.
+Denotes a lead-free package.
Ordering Information continued at the end of data sheet.
Selector Guide appears at the end of data sheet.
Pin Configuration
2.6V TO 5.5V
10µF
0.01µF
600mA
2.2µH
2.2µF
IN12
EN1
EN2
REF
IN34
EN3
EN4
OUT3
OUT4
GND
4.7µF
4.7µF
300mA
300mA
4.7µF
MAX8667
2.2µH
1.2A
LX1
LX2
OUT1
OUT2
PGND1 PGND2
2.2µF
TOP VIEW
12 11 10 9
PGND1 13
8 OUT2 (FB2)
OUT1 (FB1) 14
EN1 15
EN2 16
MAX8667
MAX8668
7 REF
6 GND
5 EN4
1234
THIN QFN
(3mm x 3mm)
( ) ARE FOR THE MAX8668
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



MAX8668
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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