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L6902D013TR Datasheet(PDF) 1 Page - STMicroelectronics |
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L6902D013TR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 6 page 1/6 L6902D June 2002 s UP TO 1A OUTPUT CURRENT s OPERATING INPUT VOLTAGE FROM 8V TO 36V s PRECISE 3.3V (±2%) REFERENCE VOLTAGE s 5% OUTPUT CURRENT ACCURACY s OUTPUT VOLTAGE ADJUSTABLE FROM 1.235V TO 34V s 250KHz INTERNALLY FIXED FREQUENCY s VOLTAGE FEEDFORWARD s ZERO LOAD CURRENT OPERATION s ADJUSTABLE CURRENT LIMIT s PROTECTION AGAINST FEEDBACK DISCONNECTION s THERMAL SHUTDOWN APPLICATIONS s CHARGERS FOR NiCd, NiMH BATTERIES AND PREREGULATOR FOR LITHIUM-ION BATTERIES s ADJUSTABLE CURRENT GENERATOR s SIMPLE STEP-DOWN CONVERTERS WITH ADJUSTABLE CURRENT LIMIT s BATTERY EQUIPPED SYSTEMS s DISTRIBUTED POWER SUPPLY s MOBILE PC & SUBNOTEBOOK DESCRIPTION The L6902D is a complete and simple step down switching regulator with adjustable current limit. Based on a voltage mode structure it integrates a cur- rent error amplifier to have a constant voltage and con- stant current control. By means of an on board current sense resistor and the availability of the current sense pins (both com- patible to Vcc and for Cs- compatible with GND too) a current limit programming is very simple and accu- rate (±5%). Moreover constant current control can be used to charge NiMH and NiCd batteries. The device can be used as a standard DC/DC con- verter with adjustable current limit (set by using the external sense resistor). The internal robust P-Channel DMOS transistor with a typical of 250m Ω assures high efficiency and a mini- mum dropout even at high output current level. The in- ternal limiting current (latched function) of typical value of 2.5A protects the device from accidental output short circuit avoiding dangerous loads damage. If the temperature of the chip goes higher than a fixed internal threshold (150°C with 20°C hysteresis), the power stage is turned off. SO8 ORDERING NUMBERS: L6902D L6902D013TR (Tape & Reel) UP TO 1A SWITCHING REGULATOR WITH ADJUSTABLE CURRENT LIMIT TEST AND APPLICATION CIRCUIT L1 22 µH OUT C1 10 µF 25V CERAMIC C3 220pF C2 22nF D1 STPS340U R3 5.1K C4 100 µF 10V POSCAP R1 5.6K RSENSE 100m Ω R2 3.3K VIN=8V to 36V 3.3V VOUT=3.3V VCC COMP VREF GND FB D01IN1306A 8 6 4 2 3 5 1 7 |
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