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MAX1920EUT+T Datasheet

  • MAX1920EUT+T

  • 低電壓、400mA、降壓型DC-DC變換器，SOT23封裝

  • 11頁

  • MAXIM   MAXIM

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19-2296; Rev 1; 7/02
Low-Voltage, 400mA Step-Down
DC-DC Converters in SOT23
General Description
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
(50碌A(chǔ)), 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.
o
400mA Guaranteed Output Current
o
Internal Synchronous Rectifier for >90%
Efficiency
o
Tiny 6-Pin SOT23 Package
o
Up to 1.2MHz Switching Frequency for Small
External Components
o
50碌A(chǔ) Quiescent Supply Current
o
0.1碌A(chǔ) Logic-Controlled Shutdown
o
2V to 5.5V Input Range
o
Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output
Voltages (MAX1921)
o
Adjustable Output Voltage (MAX1920)
o
鹵1.5% Initial Accuracy
o
Soft-Start Limits Startup Current
Features
MAX1920/MAX1921
Ordering Information
PART
MAX1920EUT-T
MAX1921EUT_
_-T
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
Applications
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
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.
Typical Operating Circuit
INPUT
2V TO 5.5V
IN
C
IN
LX
4.75k鈩?/div>
5600pF
4.7碌F
4.7碌H
OUTPUT
1.5V UP TO 400mA
Pin Configuration
TOP VIEW
IN
1
6
LX
MAX1921
AGND
PGND
AGND
2
ON
SHDN
OFF
OUT
MAX1920
MAX1921
5
PGND
SHDN
3
4
OUT (FB)
SOT23-6
( ) ARE FOR MAX1920 ONLY
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX1920EUT+T 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 可調(diào)式

  • 1

  • 1.25 V ~ 4 V

  • 2.5 V ~ 5.5 V

  • -

  • 1.2MHz

  • 400mA

  • 是

  • -40°C ~ 85°C

  • 表面貼裝

  • SOT-23-6

  • 帶卷 (TR)

  • SOT-6

  • MAX1920EUT+T-NDMAX1920EUT+TTR

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