LT1304

UTC LT1304/LT1304-3.3V/LT1304-5.0V LINEAR INTEGRATED CIRCUIT MICROPOWER DC/DC CONVERTERS WITH LOW-BATTERY DETECTOR ACTIVE IN SHUTDOWN DESCRIPTION The UTC LT1304 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated systems. The devices operate from a wide input supply range of 1.5V to 8V. The UTC LT1304-3.3 and LT1304-5.0 generate regulated outputs of 3.3V and 5V and the adjustable LT1304 can deliver output voltages up to 25V.Quiescent current,120 μ A in active mode, decreases to just 10 μ A in shutdown with the low-battery detector still active. Peak switch current, internally set at 1A,can be reduced by adding a single resistor from the ILIM pin to ground. The high speed operation of the UTC LT1304 allows the use of small, surface-mountable inductors and capacitors. SOP-8 DIP-8 FEATURES *5V at 200mA from two cells. *10μA quiescent current in shutdown. *Operates with VIN as low as1.5V *Low battery detector active in shutdown *Low switch VCESAT:370mV at 1A typical. *120μA quiescent current in active mode. *Switching frequency up to 300kHz *Programmable peak current with one resistor. . APPLICATIONS *2-,3-,or 4-cell to 5V or 3.3V step-up *Portable instruments *Bar code scanners *Palmtop computers *Diagnostic medical instrumentation. *Personal data communicators/computers. PIN CONFIGURATION LBI LBO V IN SW 1 2 3 4 8 7 6 5 FB(SENSE)* SHDN IL I M GND UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-018,A UTC LT1304/LT1304-3.3V/LT1304-5.0V LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER Input Voltage SW Voltage FB Voltage(LT1304) ILIM Voltage(LT1304-3.3/LT1304-5.0) SHDN Voltage LBI Voltage LBO Voltage Maximum Power Dissipation Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (soldering,10sec) SYMBOL VIN RATING 8 -0.4 ~ +25 VIN+0.3 5 6 VIN 8 500 125 0 ~ 70 -65 ~ +150 300 UNIT V V V V V V V mW PD Tj Topr Tstg °C °C °C °C ELECTRICAL CHARACTERISTICS (VIN=2V,VSHDN=2V Unless otherwise noted.) PARAMETER Minimum Operating Voltage Operating Voltage Range Quiescent Current Quiescent Current In Shutdown Comparator Trip Point FB Pin Bias Current Sense Pin Leakage in Shutdown Line Regulation LBI Input Threshold LBI Bias Current LBI Input Hysteresis LBO Output Voltage Low LBO Output Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current Switching Off Time Switch On Time Maximum Duty Cycle Peak Switch Current Switch Saturation Voltage * * * * * VSHDN=2V,Not switching VSHDN=0V,VIN=2V VSHDN=0V,VIN=5V 1.22 VSHDN=0V,Fixed Output Versions 1.8V≤VIN≤8V Falling Edge 1.10 120 7 27 1.24 10 0.002 0.04 1.17 6 35 ISINK=500µA LBI=1.5V,LBO=5V 1.4 0.4 V SHDN=5V V SHDN=0V Current Limit Not Asserted Current Limit Not Asserted ILIM Pin Open,VIN=5V 20K from ILIM to GND Isw=1A * Isw=700mA -5 1 4 76 0.8 5 -2 1.5 6 80 1 500 0.37 0.26 0.35 2 8 88 1.2 8 0.2 0.01 TEST CONDITIONS MIN TYP 1.5 MAX 1.65 8 200 15 50 1.26 25 1 0.15 1.25 20 65 0.4 0.1 UNIT V V µA µA µA V nA µA %/V V nA mV V µA V V µA µA µs µs % A mA V V * * * * * * * * * * * * * * * * UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-018,A UTC LT1304/LT1304-3.3V/LT1304-5.0V LINEAR INTEGRATED CIRCUIT PARAMETER Switch Leakage TEST CONDITIONS Switch off, Vsw=5V MIN TYP 0.01 MAX 7 UNIT µA The * denotes specifications which apply over the 0°C to 70°C operating temperature range. PIN FUNCTIONS PIN No. 1 2 3 4 5 6 7 SYMBOL LBI LBO VIN SW GND ILIM DESCRIPTION Low Battery Detector Input. When voltage on this pin is less than 1.17V,detector output is low Low Battery Detector Output. Open collector can sink up to 500µA.Low battery detector remains active when device is shut down. Input Supply. Must be bypassed close (