器件名称: ADP1109AN-33
功能描述: Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
文件大小: 131.9KB 共8页
简 介:a
FEATURES Operates at Supply Voltages 2 V to 12 V Fixed 3.3 V, 5 V, 12 V and Adjustable Output Minimum External Components Required Ground Current: 320 A Oscillator Frequency: 120 kHz Logic Shutdown 8-Lead DIP and SO-8 Packages APPLICATIONS Cellular Telephones Single-Cell to 5 V Converters Laptop and Palmtop Computers Pagers Cameras Battery Backup Supplies Portable Instruments Laser Diode Drivers Hand-Held Inventory Computers
Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter ADP1109
FUNCTIONAL BLOCK DIAGRAMS
VIN SENSE R2 250k COMPARATOR 1.25V REFERENCE + A1 120kHz OSCILLATOR DRIVER
ADP1109-3.3: R1 = 152k ADP1109-5: R1 = 83k ADP1109-12: R1 = 29k
SW
Q1
R1
GND
SHUTDOWN
Fixed Output
VIN FB
ADP1109
COMPARATOR 1.25V REFERENCE + A1 120kHz OSCILLATOR DRIVER Q1
SW
GENERAL DESCRIPTION
The ADP1109 is a versatile step-up switching regulator. The device requires only minimal external components to operate as a complete switching regulator. The ADP1109-5 can deliver 100 mA at 5 V from a 3 V input and the ADP1109-12 can deliver 60 mA at 12 V from a 5 V input. The device also features a logic controlled shutdown capability that, when a logic low is applied, will shut down the oscillator. The 120 kHz operating frequency allows for the use of small surface mount components. The gated oscillator capability eliminates the need for frequency compensation.
VIN 5V
GND
SHUTDOWN
Adjustable Output
TYPICAL APPLICATION
L1 33H
D1
VIN
SW
SENSE + C1 22F 16V
……
