MAX8668ETEX+T Maxim Integrated Products, MAX8668ETEX+T Datasheet

IC DC-DC CONV W/DUAL LDO 16TQFN

MAX8668ETEX+T

Manufacturer Part Number
MAX8668ETEX+T
Description
IC DC-DC CONV W/DUAL LDO 16TQFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX8668ETEWT.pdf (18 pages)

Specifications of MAX8668ETEX+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
4
Voltage - Output
1.8V, 2.8V, 0.6 ~ 3.3 V (2)
Current - Output
600mA, 1.2A
Frequency - Switching
1.5MHz
Voltage - Input
2.6 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Power - Output
1.67W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-0784; Rev 1; 7/07
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.
2.6V TO 5.5V
600mA
10µF
Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
2.2µF
0.01µF
2.2µH
1.5MHz Dual Step-Down DC-DC Converters
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
EN1
EN2
GND
LX1
OUT1
REF
PGND1
with Dual LDOs and Individual Enables
IN12
MAX8667
General Description
IN34
PGND2
OUT2
OUT3
OUT4
EN3
EN4
LX2
4.7µF
Applications
2.2µH
4.7µF
2.2µF
300mA
300mA
4.7µF
1.2A
o Tiny, Thin QFN 3mm x 3mm Package
o Individual Enables
o Step-Down Converters
o LDOs
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.
MAX8667ETEAA+
MAX8667ETEAB+
MAX8667ETEAC+
MAX8667ETECQ+
TOP VIEW
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
300mA Guaranteed
Low 1.7V Minimum Supply Voltage
Low Output Noise
OUT1 (FB1)
( ) ARE FOR THE MAX8668
PART
PGND1
EN1
EN2
13
14
15
16
12
1
(3mm x 3mm)
Ordering Information
THIN QFN
PKG CODE
MAX8667
MAX8668
11
2
T1633-4
T1633-4
T1633-4
T1633-4
Pin Configuration
10
3
9
4
8
7
6
5
Features
OUT2 (FB2)
REF
GND
EN4
TOP MARK
AEQ
AFM
AFN
AFI
1

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MAX8668ETEX+T Summary of contents

Page 1

... LX1 OUT1 OUT2 2.2µF PGND1 PGND2 ________________________________________________________________ Maxim Integrated Products 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. 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 2.2µ ...

Page 2

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 ...

Page 3

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ELECTRICAL CHARACTERISTICS (continued 3.6V -40°C to +85°C, unless otherwise noted. Typical values are at T IN34 IN12 A PARAMETER Maximum Adjustable Output MAX8668 ...

Page 4

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ( 3.6V, circuit of Figure 4, V IN12 IN34 OUT1 EFFICIENCY vs. LOAD CURRENT (V = 1.2V) OUT1 ...

Page 5

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ( 3.6V, circuit of Figure 4, V IN12 IN34 NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE OUT3 AND OUT4 ONLY 120 V = 5.5V IN12 100 80 ...

Page 6

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ( 3.6V, circuit of Figure 4, V IN12 IN34 OUT2 LOAD TRANSIENT V OUT2 600mA 10mA I OUT2 I L2 10µs/div OUT4 LOAD TRANSIENT V OUT4 ...

Page 7

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ( 3.6V, circuit of Figure 4, V IN12 IN34 OUT2 HEAVY-LOAD SWITCHING WAVEFORMS V OUT2 V LX2 I L2 500mA LOAD 400ns/div OUT3 NOISE 1ms/div _______________________________________________________________________________________ ...

Page 8

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables NAME PIN MAX8667 MAX8668 Enable Input for Regulator 3. Drive EN3 high or connect to IN34 to turn on regulator 3. Drive low 1 EN3 EN3 to turn off ...

Page 9

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables IN34 1.7V TO 5.5V UVLO EN REF REF AND BIAS GND EN1 EN2 PWRON LOGIC AND ENABLES EN3 EN4 () ARE FOR THE MAX8668 Figure 1. Functional Diagram _______________________________________________________________________________________ ...

Page 10

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables Detailed 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 ...

Page 11

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables loads up to 300mA. The LDOs include an internal refer- ence, error amplifier, p-channel pass transistor, and internal voltage-dividers. Each error amplifier compares the reference voltage to the output ...

Page 12

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables INPUT 2.8V TO 5.5V 10µF 0.01µF OUT2 1.2A C7 2.2µF Figure 3. MAX8667 Typical Application Circuit INPUT 2.6V TO 5.5V OUT2 0.6V TO 3.3V, 1.2A C7 ≤ 1.8V 2.2µF ...

Page 13

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables Applications Information Setting the Output Voltages and Voltage Positioning The LDO output voltages of the MAX8667/MAX8668, and the step-down outputs of the MAX8667 are factory preset. See the Selector ...

Page 14

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables Table 1. Recommended Inductors MANUFACTURER INDUCTOR FDK MIPF2016 FDK MIPF2520D LQH32CN2R2M5 Murata LQM31P Sumida CDRH2D09 TDK GLF251812T TOKO D2812C TOKO MDT2520-CR TPC Series Wurth TPC Series Taiyo Yuden CB2518T ...

Page 15

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables C10 is needed if V > 1. OUT IN12 V / 0.65. OUT LDO Output Capacitor and Stability Connect a 4.7µF ceramic capacitor between OUT3 and GND, ...

Page 16

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables Ordering Information (continued) PART PKG CODE MAX8667ETEHR+ T1633-4 MAX8667ETEJS+ T1633-4 MAX8668ETEA+ T1633-4 MAX8668ETEP+ T1633-4 MAX8668ETEQ+ T1633-4 MAX8668ETET+ T1633-4 MAX8668ETEU+ T1633-4 MAX8668ETEV+ T1633-4 MAX8668ETEW+ T1633-4 MAX8668ETEX+ T1633-4 All MAX8667/MAX8668 parts ...

Page 17

Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) E MARKING E/2 AAAA D/2 D ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products ...

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