Micropower, DC-DC Converter Adjustable Fixed ADP1108 GAIN BLOCK/

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Micropower, DC-DC Converter Adjustable Fixed ADP1108 GAIN BLOCK/

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FEATURES Operates Supply Voltages From Consumes Only Supply Current Step-Up Step-Down Mode Operation Minimum External Components Required Battery Detector Comparator Chip User-Adjustable Current Limit Internal Power Switch Fixed Adjustable Output Voltage Versions 8-Pin SO-8 Package APPLICATIONS Notebook/Palmtop Computers Converters Converters Bias Generators Peripherals Add-On Cards Battery Backup Supplies Cellular Telephones Portable Instruments GENERAL DESCRIPTION
Micropower, DC-DC Converter Adjustable Fixed ADP1108
GAIN BLOCK/ ERROR ILIM COMPARATOR 1.245V REFERENCE
ADP1108
OSCILLATOR DRIVER
753k
ADP1108 highly versatile micropower switch-mode dcdc converter that operates from input voltage supply typically starts from ADP1108 programmed into step-up step-down dc-to-dc converter with only three external components. fixed outputs adjustable version also available. step-up mode, supply voltage range step-down mode. ADP1108 deliver from cell input from step-down mode. Switch current limit programmed with single resistor. battery operated power-conscious applications, ADP1108 offers very power consumption less than auxiliary gain block available ADP1108 used battery detector, linear post regulator, under voltage lockout circuit error amplifier.
Model
ORDERING GUIDE Output Voltage Package Description Package Option*
ADP1108AN-3.3 ADP1108AR-3.3 ADP1108AN-5 ADP1108AR-5 ADP1108AN-12 ADP1108AR-12 ADP1108AN ADP1108AR
PDIP SOIC PDIP SOIC PDIP SOIC PDIP SOIC
SO-8 SO-8 SO-8 SO-8
*For outline information Package Information section.
CONFIGURATIONS 8-Lead Plastic (N-8) 8-Lead SOIC (SO-8)
ILIM
(SENSE)*
ILIM
VIEW (Not Scale)
(SENSE)*
ADP1108
ADP1108
*FIXED VERSION
VIEW (Not Scale) *FIXED VERSION
This information applies product under development. characteristics specifications subject change without notice. Analog Devices assumes obligation regarding future manufacture unless otherwise agreed writing.
obtain most recent version complete data sheet, call retrieval system 1-800-446-6212 visit World Wide site http://www.analog.com.
REV.
ADP1108-SPECIFICATIONS
Parameter
unless otherwise noted)
Conditions1 Units
Symbol
QUIESCENT CURRENT QUIESCENT CURRENT, BOOST MODE CONFIGURATION
Switch Off* Load ADP1108-3 ADP1108-5 ADP1108-12 Step-Up Mode* Step-Down Mode* ADP1108*1 1.20 3.13 4.75 11.4
INPUT VOLTAGE COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE
12.6 1.245 5.00 12.0 1.30 3.46 5.25 12.6 0.075
VOUT
ADP1108-3 ADP1108-5*2 ADP1108-12*2 ADP1108* ADP1108-3 ADP1108-5* ADP1108-12*
COMPARATOR HYSTERESIS OUTPUT HYSTERESIS
OSCILLATOR FREQUENCY DUTY CYCLE SWITCH TIME
FEEDBACK BIAS CURRENT BIAS CURRENT GAIN BLOCK OUTPUT
REFERENCE LINE REGULATION
NOTES *Denotes specifications that apply over full operating temperature range. This specification guarantees that both high trip points comparator fall within 1.20 1.30 range. output voltage waveform will exhibit sawtooth shape comparator hysteresis. output voltage fixed output versions will always within specified range. Specifications subject change without notice.
Full Load ILIM Tied VSET VREF*
0.15 0.02
ISINK VSET 1.00
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN) Voltage (VSW1) Voltage (VSW2) -0.5 Feedback Voltage (ADP1108) Sense Voltage (ADP1108, -12) Maximum Power Dissipation Maximum Switch Current Operating Temperature Range +70°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, sec) +300°C
This information applies product under development. characteristics specifications subject change without notice. Analog Devices assumes obligation regarding future manufacture unless otherwise agreed writing.
REV.

Micropower, DC-DC Converter Adjustable Fixed ADP1108 GAIN BLOCK/

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