MAX1626-MAX1627 Maxim, MAX1626-MAX1627 Datasheet
MAX1626-MAX1627
Manufacturer Part Number
MAX1626-MAX1627
Description
5V/3.3V or Adjustable / 100% Duty-Cycle / High-Efficiency / Step-Down DC-DC Controllers
Manufacturer
Maxim
Datasheet
1.MAX1626-MAX1627.pdf
(16 pages)
The MAX1626/MAX1627 step-down DC-DC switching
controllers provide high efficiency over loads ranging
from 1mA to more than 2A. A unique current-limited,
pulse-frequency-modulated (PFM) control scheme
operates with up to a 100% duty cycle, resulting in very
low dropout voltages. This control scheme eliminates
minimum load requirements and reduces the supply
current under light loads to 90µA (versus 2mA to 10mA
for common pulse-width modulation controllers).
These step-down controllers drive an external P-chan-
nel MOSFET, allowing design flexibility for applications
to 12W or higher. Soft-start reduces current surges dur-
ing start-up. A high switching frequency (up to 300kHz)
and operation in continuous-conduction mode allow the
use of tiny surface-mount inductors. Output capacitor
requirements are also reduced, minimizing PC board
area and system costs.
The output voltage is preset at 5V or 3.3V for the
MAX1626 and adjustable for the MAX1627. Input volt-
ages can be up to 16.5V. The MAX1626/MAX1627 are
functional upgrades for the MAX1649/MAX1651.
________________________Applications
19-1075; Rev 0; 6/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
__________________Pin Configuration
TOP VIEW
( ) ARE FOR MAX1627
High-Efficiency, Step-Down DC-DC Controllers
PCMCIA Power Supplies
Personal Digital Assistants
Hand-Held Computers
Portable Terminals
Low-Cost Notebook Computer Supplies
5V to 3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
3/5 (FB)
SHDN
OUT
REF
________________________________________________________________ Maxim Integrated Products
5V/3.3V or Adjustable, 100% Duty-Cycle,
1
2
3
4
MAX1626
MAX1627
SO
8
7
6
5
GND
EXT
CS
V+
____________________________Features
* Dice are tested at T
__________Typical Operating Circuit
______________Ordering Information
MAX1626C/D
MAX1626ESA
MAX1627C/D
MAX1627ESA
Low Dropout Voltage
100% Maximum Duty Cycle
Soft-Start Limits Start-Up Current
Efficiency >90% (3mA to 2A Loads)
Output Power >12.5W
90µA Max Quiescent Current
1µA Max Shutdown Current
Up to 300kHz Switching Frequency
16.5V Max Input Voltage
Output Voltage: 5V/3.3V (MAX1626)
Current-Limited Control Scheme
ON/OFF
3.3V to 16.5V
PART
INPUT
SHDN
3/5
REF
MAX1626
A
-40°C to +85°C
-40°C to +85°C
GND
TEMP. RANGE
= +25°C.
Adjustable (MAX1627)
0°C to +70°C
0°C to +70°C
OUT
EXT
V+
CS
P
PIN-PACKAGE
Dice*
8 SO
Dice*
8 SO
OUTPUT
3.3V
1
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