MAX1920 Maxim, MAX1920 Datasheet
MAX1920
Manufacturer Part Number
MAX1920
Description
PLASTIC ENCAPSULATED DEVICES
Manufacturer
Maxim
Datasheet
1.MAX1920.pdf
(9 pages)
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The MAX1920/MAX1921 step-down converters deliver
over 400mA to outputs as low as 1.25V. These convert-
ers use a unique proprietary current-limited control
scheme that achieves over 90% efficiency. These
devices maintain extremely low quiescent supply current
(50µA), and their high 1.2MHz (max) operating frequency
permits small, low-cost external components. This combi-
nation makes the MAX1920/MAX1921 excellent high-
efficiency alternatives to linear regulators in space-
constrained applications.
Internal synchronous rectification greatly improves effi-
ciency and eliminates the external Schottky diode
required in conventional step-down converters. Both
devices also include internal digital soft-start to limit
input current upon startup and reduce input capacitor
requirements.
The MAX1920 provides an adjustable output voltage
(1.25V to 4V). The MAX1921 provides factory-preset
output voltages (see the Selector Guide). Both are
available in space-saving 6-pin SOT23 packages.
19-2296; Rev 1; 7/02
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.
2V TO 5.5V
INPUT
C
OFF
IN
ON
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
IN
AGND
SHDN
Typical Operating Circuit
MAX1921
________________________________________________________________ Maxim Integrated Products
PGND
OUT
General Description
LX
4.75kΩ
Applications
5600pF
4.7µH
Low-Voltage, 400mA Step-Down
1.5V UP TO 400mA
OUTPUT
4.7µF
DC-DC Converters in SOT23
o 400mA Guaranteed Output Current
o Internal Synchronous Rectifier for >90%
o Tiny 6-Pin SOT23 Package
o Up to 1.2MHz Switching Frequency for Small
o 50µA Quiescent Supply Current
o 0.1µA Logic-Controlled Shutdown
o 2V to 5.5V Input Range
o Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output
o Adjustable Output Voltage (MAX1920)
o ±1.5% Initial Accuracy
o Soft-Start Limits Startup Current
Note: The MAX1921 offers five preset output voltage options.
See the Selector Guide, and then insert the proper designator
into the blanks above to complete the part number.
MAX1920EUT-T
MAX1921EUT_ _-T
Efficiency
External Components
Voltages (MAX1921)
TOP VIEW
( ) ARE FOR MAX1920 ONLY
PART
AGND
SHDN
IN
1
2
3
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
SOT23-6
MAX1920
MAX1921
Pin Configuration
6
5
4
LX
PGND
OUT (FB)
6 SOT23-6
6 SOT23-6
PIN-PACKAGE
Features
1
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