MAX639 Maxim, MAX639 Datasheet
MAX639
Manufacturer Part Number
MAX639
Description
5V/3.3V/3V/Adjustable / High-Efficiency / Low IQ / Step-Down DC-DC Converters
Manufacturer
Maxim
Datasheet
1.MAX639.pdf
(12 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX639
Manufacturer:
MAXIM
Quantity:
5 510
Company:
Part Number:
MAX639
Manufacturer:
MAXIM
Quantity:
5 510
Company:
Part Number:
MAX6390XS26D7+T
Manufacturer:
MAXIM
Quantity:
467
Company:
Part Number:
MAX6390XS29D4 T
Manufacturer:
Maxim
Quantity:
5 000
Company:
Part Number:
MAX6390XS29D4+T
Manufacturer:
RICOH
Quantity:
2 380
Part Number:
MAX6390XS29D4-T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX6392KA26+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX6392KA29-T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX6392KA31+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX6392KA44+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
19-4505; Rev 3; 8/97
The MAX639/MAX640/MAX653 step-down switching
regulators provide high efficiency over a wide range of
load currents, delivering up to 225mA. A current-limiting
pulse-frequency-modulated (PFM) control scheme gives
the devices the benefits of pulse-width-modulated
(PWM) converters (high efficiency at heavy loads), while
using only 10µA of supply current (vs. 2mA to 10mA for
PWM converters). The result is high efficiency over a
wide range of loads.
The MAX639/MAX640/MAX653 input range is 4V to
11.5V, and the devices provide lower preset output volt-
ages of 5V, 3.3V, and 3V, respectively. Or, the output
can be user-adjusted to any voltage from 1.3V to the
input voltage.
The MAX639/MAX640/MAX653 have an internal 1A power
MOSFET switch, making them ideal for minimum-compo-
nent, low- and medium-power applications. For increased
output drive capability, use the MAX649/MAX651/MAX652
step-down controllers, which drive an external P-channel
FET to deliver up to 5W.
________________________Applications
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
__________Typical Operating Circuit
_______________General Description
LOW-BATTERY
DETECTOR
ON/OFF
9V Battery to 5V, 3.3V, or 3V Conversion
High-Efficiency Linear Regulator Replacement
Portable Instruments and Handy-Terminals
5V-to-3.3V Converters
INPUT
5.5V TO 11.5V
INPUT
SHDN
LBI
________________________________________________________________ Maxim Integrated Products
VFB
MAX639
5V/3.3V/3V/Adjustable, High-Efficiency,
V+
GND
Low I
VOUT
LBO
LX
LOW-BATTERY
DETECTOR
OUTPUT
Q
, Step-Down DC-DC Converters
OUTPUT
225mA
5V
Ordering Information continued on last page.
* Contact factory for dice specifications.
____________________________Features
__________________Pin Configuration
______________Ordering Information
MAX639CPA
MAX639CSA
MAX639C/D
MAX639EPA
MAX639ESA
MAX639MJA
High Efficiency for a Wide Range of Load Currents
10µA Quiescent Current
Output Currents Up to 225mA
Preset or Adjustable Output Voltage:
Low-Battery Detection Comparator
Current-Limiting PFM Control Scheme
TOP VIEW
PART
5.0V (MAX639)
3.3V (MAX640)
3.0V (MAX653)
VOUT
GND
LBO
LBI
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
1
3
4
2
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX639
MAX640
MAX653
DIP/SO
8
7
6
5
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
SHDN
VFB
V+
LX
1
Related parts for MAX639
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
The DS5250 is a highly secure, four clocks-per-machine cycle, 100% 8051-instruction-set-compatible microprocessor in Maxim's secure microcontroller family
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
The MAX9263/MAX9264 chipset extends Maxim's gigabit multimedia serial link (GMSL) technology to include high-bandwidth digital content protection (HDCP) encryption for content protection of DVD and Blu-ray™ video and audio data
Manufacturer:
Maxim
Part Number:
Description:
The Maxim MXL1016 (10ns, typ) high-speed, complementary-output comparator is designed specifically to
interface directly to TTL logic while operating from
either a dual ±5V supply or a single +5V supply
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's DG300–DG303 and DG300A–DG303A CMOS dual and quad analog switches combine low power operation with fast switching times and superior DC and AC switch characteristics
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's DG300–DG303 and DG300A–DG303A CMOS dual and quad analog switches combine low power operation with fast switching times and superior DC and AC switch characteristics
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's DG300–DG303 and DG300A–DG303A CMOS dual and quad analog switches combine low power operation with fast switching times and superior DC and AC switch characteristics
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's DG300–DG303 and DG300A–DG303A CMOS dual and quad analog switches combine low power operation with fast switching times and superior DC and AC switch characteristics
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG401/DG403/DG405 analog switches now feature guaranteed low on-resistance matching between switches (2Ω max) and guaranteed on-resistance flatness over the signal range (3Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG401/DG403/DG405 analog switches now feature guaranteed low on-resistance matching between switches (2Ω max) and guaranteed on-resistance flatness over the signal range (3Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG401/DG403/DG405 analog switches now feature guaranteed low on-resistance matching between switches (2Ω max) and guaranteed on-resistance flatness over the signal range (3Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG406 and DG407 CMOS analog multiplexers now feature guaranteed matching between channels (8Ω max) and flatness over the specified signal range (9Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG406 and DG407 CMOS analog multiplexers now feature guaranteed matching between channels (8Ω max) and flatness over the specified signal range (9Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG408 and DG409 CMOS analog multiplexers now feature guaranteed matching between channels (8Ω max) and flatness over the specified signal range (9Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG408 and DG409 CMOS analog multiplexers now feature guaranteed matching between channels (8Ω max) and flatness over the specified signal range (9Ω max)
Manufacturer:
Maxim
Datasheet:
Part Number:
Description:
Maxim's redesigned DG411/DG412/DG413 analog switches now feature low on-resistance matching between switches (3Ω max) and guaranteed on-resistance flatness over the signal range (Δ4Ω max)
Manufacturer:
Maxim
Datasheet: