MAX1935 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 500mA, Low-Voltage Linear Regulator in Tiny QFN

19-2599; Rev 0; 10/02
500mA, Low-Voltage Linear Regulator
in Tiny QFN
General Description
The MAX1935 low-dropout linear regulator operates
from a 2.25V to 5.5V supply and delivers a guaranteed
500mA load current with low 175mV dropout. The high-
accuracy (±1.5%) output voltage is preset at an inter-
nally trimmed voltage or can be adjusted from 0.8V to
4.5V with an external resistive-divider.
An internal PMOS pass transistor allows low 210µA
supply current, making this device ideal for portable
equipment such as personal digital assistants (PDAs),
cellular phones, cordless phones, and other equip-
ment, including base stations and docking stations.
Other features include an active-low, power-OK output
that indicates when the output is out of regulation, a
0.02µA shutdown mode, short-circuit protection, and
thermal-shutdown protection. The MAX1935 comes in a
tiny 1.9W, 8-pin 3mm x 3mm thin QFN package.
Applications
Notebook Computers
Cellular and Cordless Telephones
PDAs
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
Features
o Guaranteed 500mA Output Current
o Output Down to 0.8V
o Low 175mV Dropout at 500mA
o ±1.5% Output Voltage Accuracy
Preset at 1.5V
Adjustable from 0.8V to 4.5V
o Power-OK Output
o Low 210µA Ground Current
o 0.02µA Shutdown Current
o Thermal-Overload Protection
o Output Current Limit
o Tiny 1.9W, 8-Pin 3mm x 3mm Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1935ETA*
-40°C to +85°C
8 Thin QFN
3mm x 3mm
MAX1935ETA15*
-40°C to +85°C
8 Thin QFN
3mm x 3mm
*Contact factory for preset output voltages.
Selector Guide
PART
MAX1935ETA
MAX1935ETA15
O U T PU T
VO L T A G E
Adjustable
1.5V
TOP MARK
ADB
ADB
Typical Operating Circuit
Pin Configuration
R_POK
100kΩ
TO µC
V_IN
2.25V TO 5.5V
C_IN
1µF
ON
OFF
POK
OUT
MAX1935
IN
SET
SHDN
GND
V_OUT
0.8V TO 4.5V
C_OUT
10µF
R₁
R₂
TOP VIEW
IN 1
IN 2
POK 3
SHDN 4
MAX1935
8 OUT
7 OUT
6 SET
5 GND
THIN QFN
3mm x 3mm
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