MAX8640ZEXT18+T Maxim Integrated Products, MAX8640ZEXT18+T Datasheet

IC DC-DC CONV 1.8V SC70-6

MAX8640ZEXT18+T

Manufacturer Part Number
MAX8640ZEXT18+T
Description
IC DC-DC CONV 1.8V SC70-6
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX8640ZEXT18+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.8V
Current - Output
500mA
Frequency - Switching
4MHz
Voltage - Input
2.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SC-70-6, SC-88, SOT-363
Power - Output
245mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8640Y/MAX8640Z step-down converters are
optimized for applications where small size, high effi-
ciency, and low output ripple are priorities. They utilize
a proprietary PWM control scheme that optimizes the
switching frequency for high efficiency with small exter-
nal components and maintains low output ripple volt-
age at all loads. The MAX8640Z switches at up to
4MHz to allow a tiny 1µH inductor and 2.2µF output
capacitor. The MAX8640Y switches at up to 2MHz for
higher efficiency while still allowing small 2.2µH and
4.7µF components. Output current is guaranteed up to
500mA, while typical quiescent current is 28µA.
Factory-preset output voltages from 0.8V to 2.5V elimi-
nate external feedback components.
Internal synchronous rectification greatly improves effi-
ciency and replaces the external Schottky diode
required in conventional step-down converters. Internal
fast soft-start eliminates inrush current so as to reduce
input capacitor requirements.
The MAX8640Y/MAX8640Z are available in the tiny 6-
pin, SC70 (2.0mm x 2.1mm) and µDFN (1.5mm x
1.0mm) packages. Both packages are lead-free.
19-3997; Rev 4; 2/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
2.7V TO 5.5V
INPUT
2.2μF
ON/OFF
Microprocessor/DSP Core Power
I/O Power
Cell Phones, PDAs, DSCs, MP3s
Other Handhelds Where Space Is Limited
C1
Typical Operating Circuit
IN
GND
SHDN
________________________________________________________________ Maxim Integrated Products
MAX8640Y
MAX8640Z
General Description
Tiny 500mA, 4MHz/2MHz Synchronous
OUT
LX
1μH OR 2.2μH
Applications
2.2μF OR
L1
4.7μF
C2
Step-Down DC-DC Converters
UP TO 500mA
0.8V TO 2.5V
OUTPUT
♦ Tiny SC70 and µDFN Packages
♦ 500mA Guaranteed Output Current
♦ 4MHz or 2MHz PWM Switching Frequency
♦ Tiny External Components: 1µH/2.2µF or
♦ 28µA Quiescent Current
♦ Factory Preset Outputs from 0.8V to 2.5V
♦ ±1% Initial Accuracy
♦ Low Output Ripple at All Loads
♦ Ultrasonic Skip Mode Down to 1mA Loads
♦ Ultra-Fast Line- and Load-Transient Response
♦ Fast Soft-Start Eliminates Inrush Current
* Contact factory for availability of each version. For 2.85V output
(82 version), request application note that includes limitations
and typical operating characteristics.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Note: All devices are specified over the -40°C to +85°C
operating temperature range.
Ordering Information continued and Selector Guide appears
at end of data sheet.
MAX8640YEXT08+T
2.2µH/4.7µF
MAX8640YEXT10+T
MAX8640YEXT11+T
MAX8640YEXT12+T
MAX8640YEXT13+T
MAX8640YEXT15+T
MAX8640YEXT16+T
MAX8640YEXT18+T
MAX8640YEXT19+T
MAX8640YEXT82+T
GND
OUT
LX
1
2
3
2.0mm x 2.1mm
PART*
+
MAX8640Y
MAX8640Z
SC70
6
5
4
IN
GND
SHDN
Ordering Information
TOP VIEW
PIN-
PACKAGE
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
Pin Configurations
GND
OUT
LX
+
1
2
3
1.5mm x 1.0mm
MAX8640Y
MAX8640Z
μDFN
Features
TOP MARK
6
5
4
ACQ
ACG
ADD
ACH
ACR
ACS
ADB
ADF
ADJ
ACI
SHDN
IN
GND
1

Related parts for MAX8640ZEXT18+T

MAX8640ZEXT18+T Summary of contents

Page 1

... MAX8640Y GND MAX8640Z OUT SHDN ON/OFF ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. Step-Down DC-DC Converters ♦ Tiny SC70 and µDFN Packages ♦ 500mA Guaranteed Output Current ♦ 4MHz or 2MHz PWM Switching Frequency ♦ ...

Page 2

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +6V OUT, SHDN to GND ....................................-0. Current (Note 1) ........................................................0.8A OUTPUT Short Circuit to GND ...................................Continuous Continuous Power Dissipation (T = +70°C) ...

Page 3

Tiny 500mA, 4MHz/2MHz Synchronous (V = 3.6V 1.5V, MAX8640Z Murata LQH32CN series OUT EFFICIENCY vs. LOAD CURRENT 1.8V OUTPUT 100 MAX8640YEXT18 0 ...

Page 4

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters (V = 3.6V 1.5V, MAX8640Z Murata LQH32CN series OUT LIGHT-LOAD STARTUP WAVEFORM (100Ω LOAD) V SHDN V OUT 20μs/div LINE-TRANSIENT RESPONSE (4V TO ...

Page 5

Tiny 500mA, 4MHz/2MHz Synchronous PIN NAME Inductor Connection to the Internal Drains of the p-channel and n-channel MOSFETs. High impedance 1 LX during shutdown GND Ground. Connect these pins together directly under the IC. Output Sense Input. Bypass ...

Page 6

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters The MAX8640Y/MAX8640Z include internal soft-start circuitry that eliminates inrush current at startup, reduc- ing transients on the input source. Soft-start is particu- larly useful for higher impedance input sources, such as Li+ and ...

Page 7

Tiny 500mA, 4MHz/2MHz Synchronous their small size and low ESR. Make sure the capacitor maintains its capacitance over temperature and DC bias. Capacitors with X5R or X7R temperature charac- teristics typically perform well. The output capacitance can be very low; ...

Page 8

... MAX8640YELT25+T 6 µDFN MAX8640YELT82+T 6 µDFN MAX8640ZEXT08+T 6 SC70 MAX8640ZEXT11+T 6 SC70 MAX8640ZEXT12+T 6 SC70 MAX8640ZEXT13+T 6 SC70 MAX8640ZEXT15+T 6 SC70 MAX8640ZEXT18+T 6 SC70 MAX8640ZELT08+T 6 µDFN MAX8640ZELT11+T 6 µDFN MAX8640ZELT12+T 6 µDFN MAX8640ZELT13+T 6 µDFN MAX8640ZELT15+T 6 µDFN MAX8640ZELT18+T 6 µDFN * Contact factory for availability of each version. For 2.85V output (82 version), request application note that includes limitations and typical operating characteristics ...

Page 9

Tiny 500mA, 4MHz/2MHz Synchronous For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 6 µDFN 6 SC70 TOPMARK PIN 1 D MARK TOP VIEW -DRAWING NOT TO SCALE- _______________________________________________________________________________________ Step-Down DC-DC ...

Page 10

Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters For the latest package outline information and land patterns www.maxim-ic.com/packages. TOPMARK PIN 1 D MARK TOP VIEW -DRAWING NOT TO SCALE- 10 ______________________________________________________________________________________ Package Information (continued) 5 ...

Page 11

Tiny 500mA, 4MHz/2MHz Synchronous For the latest package outline information and land patterns www.maxim-ic.com/packages. ______________________________________________________________________________________ Step-Down DC-DC Converters Package Information (continued) 11 ...

Page 12

... 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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