器件名称: ADP1109AAN-12
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: 143.65KB 共8页
简 介:a
FEATURES Operates at Supply Voltages 2 V to 9 V Fixed 3.3 V, 5 V, 12 V and Adjustable Output Minimum External Components Required Ground Current: 460 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 ADP1109A
FUNCTIONAL BLOCK DIAGRAM
VIN SENSE R2 250k COMPARATOR 1.25V REFERENCE A1 120kHz OSCILLATOR DRIVER Q1
ADP1109A-3.3: R1 = 152k ADP1109A-5: R1 = 83k ADP1109A-12: R1 = 29k
SW
R1
GND
SHUTDOWN
PGND
VIN
FB
ADP1109A
COMPARATOR
SW 120kHz OSCILLATOR DRIVER
GENERAL DESCRIPTION
1.25V REFERENCE
A1
Q1
The ADP1109A is a versatile step-up switching regulator. The device requires only minimal external components to operate as a complete switching regulator. The ADP1109A-5 can deliver 100 mA at 5 V from a 3 V input and the ADP1109A-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.
GND SHUTDOWN
PGND
TYPICAL APPLICATION
L1 33H D1
3
VIN 5V
1
VIN
SW
SENSE 8
ADP1109A-12
7
VOUT 1……
