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| 型号： | MAX1921EUT33+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2 V ~ 5.5 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-6 |
19-2296; Rev 3; 8/05
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
(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. The
MAX1920 is also available in a 6-pin TDFN package.
Features
? 400mA Guaranteed Output Current
? Internal Synchronous Rectifier for >90% Efficiency
? Tiny 6-Pin SOT23 Package
? Available in 6-Pin TDFN Package (MAX1920)
? Up to 1.2MHz Switching Frequency for Small
External Components
? 50μA Quiescent Supply Current
? 0.1μA Logic-Controlled Shutdown
? 2V to 5.5V Input Range
? Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output
Voltages (MAX1921)
? Adjustable Output Voltage (MAX1920)
? ±1.5% Initial Accuracy
? Soft-Start Limits Startup Current
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
Applications
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
MAX1920EUT-T
MAX1920EUT+T
MAX1920ETT-T
MAX1920ETT+T
MAX1921EUT_ _-T
MAX1921EUT_ _+T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
6 SOT23-6
6 TDFN
6 TDFN
6 SOT23-6
6 SOT23-6
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.
+ Denotes lead-free package.
Typical Operating Circuit
Pin Configuration
INPUT
2V TO 5.5V
4.7 μ H
OUTPUT
1.5V UP TO 400mA
TOP VIEW
IN
LX
6
5
4
C IN
4.75k ?
4.7 μ F
IN 1
6 LX
MAX1921
5600pF
AGND
PGND
AGND 2
MAX1920
MAX1921
5 PGND
MAX1920
ON
SHDN
OUT
SHDN 3
4 OUT (FB)
OFF
1
2
3
SOT23-6
TDFN
( ) ARE FOR MAX1920 ONLY
A "+" sign will replace the first pin indicator on lead-free packages.
________________________________________________________________ Maxim Integrated Products
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.
1
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