SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR

Transcription

1 SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR Product Description The is a compact, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start-up input voltage below 1V makes suitable for 1 to 4 battery cells applications of providing up to 300mA output current. The 450KHz high switching rate minimized the size of external components. Besides, the 17 μa low quiescent current together with high efficiency maintains long battery lifetime. The output voltage is set with two external resistors. Both internal 2A switch and driver for driving external power devices (NMOS or NPN) are provided. Features 1.0V Low Start-up Input Voltage High Supply Capability to Deliver 3.3V 100mA with 1 Alkaline Cell 17uA Quiescent (Switch-off) Supply Current Zero Shutdown Mode Supply Current 90% Efficiency 450kHz Fixed Switching Frequency Providing Flexibility for Using Internal and External Power Switches Small SOT-26,SOT89-5 Package Applications PDA MP3 DSC LCD Panel RF-Tags Portable Instrument Wireless Equipment Block Diagram 1

2 Packages & Pin Assignments RF SOT-23-6L Pin No. Symbol YF SOT-89-5L Fixed Version Pin No. Description 1 CE 1 CE 2 EXT 2 VDD 3 GND 3 FB 4 LX 4 LX 5 VDD 6 FB 5 GND Ordering Information Marking Information Absolute Maximum Ratings Ta=25ºC Unless otherwise noted. Symbol Parameter Max Units V IN Input Voltage VSS-0.3~VSS+10 V OUT V LX Output Voltage VSS-0.3~VSS+10 VSS-0.3~VSS+10 I EXT EXT pin Driver Current 200 ma I LX LX pin Switch Current 2.5 A P D Power Dissipation SOT SOT T A Operating Ambient Temperature Range -40 to 80 ºC T STG Storage Temperature Range -40 to 125 ºC Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. V mw 2

3 Electrical Characteristics Ta=25ºC Unless otherwise noted. Symbol Parameter Test Conditions Min TYP Max Units V OUT Output Voltage - V OUT X0.98 V OUT X1.02 V IN Input Voltage V ST V ST2 I OFF Operation Start Voltage OSC Start Voltage Shut Down Current I OUT =1mA No external parts,voltage applied to V OUT, CONT pin pulled up to V OUT via 300 & resistor CE=0V,VIN=4.5V ua I SWITCH-OFF Switch-Off Current V IN =6V ua I SWITCH Continuous Switching Current VIN=CE=3.3V,VFB=GND I NO-LOAD No Load Current VIN=1.5V,VOUT=3.3V V REF F S Feedback Reference Voltage Switching Frequency Close Loop VDD=3.3V V V DD =3.3V KHz D MAX Maximum Duty V DD =3.3V % I LIMIT LX On Resistance V DD =3.3V Ω Current Limit Setting EXT On Resistance to VDD EXT On Resistance to GND V DD =3.3V A V DD =3.3V Ω V DD =3.3V Ω REG LINE Line Regulation VIN=3.5V~6V.IOUT=1mA mv/ V REG LOAD Load Regulation VIN=2.5V.IOUT=1~100mA mv/ ma T S ΔT SD CE Pin Trip Level V DD =3.3V V Temperature Stability For Vout Thermal Shut Down Hysterises V ua ppm/ ºC ºC Test Circuits 3

4 Typical Application Circuit VIN L1 3.3 to 10uH C3 100uF D1 1N5819 Vout 3.3V/5V CE VDD LX C2 R1 1.8M/3M C4 102 C1 100uF C6 106 EXT GND FB R2 980K/1M Typical Application for Portable Instruments High Voltage Application High Current Application 4

5 Typical Application Circuit(contunie) VIN 3.3V/5V R3 100 C1 C2 L1 4.7uH Q1 NMOS C8 C3 10uF C4 10uF 18V 10mA 9V 10mA VDD LX C7 R1 620K CE GND FB EXT C6 0. R2 100K C5 10uF -9V 10mA Multi-Output Application Typical Performance Characteristics T A =25 C Unless otherwise noted. Efficiency V.S. Output Current Input Current V.S. Output Current Input Current V.S. Input Voltage Supply Current V.S. Input Voltage 5

6 Typical Performance Characteristics(contunie) Switching Frequency V.S. V DD Pin Voltage Start Up Voltage V.S. Output Current LX Wave Form & Output Ripple Transient Response Output Voltage V.S. Temperature 6

7 Package Dimension (SOT-23-6L) D e R1 E R G E1 PIN 1 MARKING b L (L1) θ e1 A A2 C A1 Dimensions SYMBOL Millimeters Inches MIN MAX MIN MAX A A A b c D 2.90 (TYP).114 (TYP) E 2.80 (TYP).110 (TYP) E (TYP).063 (TYP) e 0.95 (TYP).037 (TYP) e (TYP).075 (TYP) L L (TYP).024 (TYP) R R G 0.25 (TYP).010 (TYP) θ

8 SOT-89-5L D D1 b1 A H e e b b1 b Dimensions SYMBOL Millimeters Inches MIN MAX MIN MAX A b B b C C D D e H

9 NOTICE Information furnished is believed to be accurate and reliable. However Globaltech Semiconductor assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Globaltech Semiconductor. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information without express written approval of Globaltech Semiconductor. CONTACT US GS Headquarter 4F.,No.43-1,Lane11,Sec.6,Minquan E.Rd Neihu District Taipei City 114, Taiwan (R.O.C) Wu-Xi Branch No.21 Changjiang Rd., WND, Wuxi, Jiangsu, China (INFO. &. TECH. Science Park Building A 210 Room) sales_cn@gs-power.com 824 Bolton Drive Milpitas. CA RD Division Version_1.0 Notice