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| ST735 -5V INVERTING, NEGATIVE OUTPUT CURRENT-MODE PWM REGULATOR s s s s s s s s s s s CONVERTS +4.0V TO + 6.2V INPUT TO -5V OUTPUT 1W GUARANTEED OUTPUT POWER 75% TYPICAL EFFICIENCY 0.8mA QUIESCENT CURRENT 10A SHUTDOWN MODE 160KHZ FIXED FREQUENCY OSCILLATOR CURRENT MODE PWM CONVERTER LOW NOISE AND JITTER SOFT START SIMPLE APPLICATION CIRCUIT UNDERVOLTAGE LOCKOUT DIP-8 SO-8 DESCRIPTION The ST735 is a Bi-CMOS, inverting switch mode DC-DC regulator with internal Power MOSFET's that generates a fixed -5V output voltage from a 4V to 6.2V input voltage; is guaranteed an output current of 200mA for inputs greater than 4.5V. The quiescent current for this device is typically of 0.8mA and, in shutdown mode it is reduced to 10A. SCHEMATIC DIAGRAM These power-conserving features, along with high efficiency and applications circuits, that lend itself to minaturization, make the ST735 excellent in a broad range of on-card, HDD and portable equipment applications. The ST735 employ a high performance current mode pulse with modulation (PWM) control scheme to provide tight output voltage regulation and low noise. The fixed frequency oscillator is factory trimmed to 160KHz, allowing for easy noise filtering. The regulator in production is tested to guarantee an output accuracy within 5% over all specified conditions. August 2002 1/9 ST735 ABSOLUTE MAXIMUM RATINGS Symbol VIN SHDN VLX VFB VOUT ILX Ptot Tstg Top Parameter DC Input Voltage (VIN to GND) Shutdown Voltage (SHDN to GND) Switch Voltage (Lx to VIN) Feedback Voltage (VOUT to GND) Output Voltage (VOUT to GND) Other Input Voltage (SS, CC to GND) Peack Switch Current Power Dissipation at Tj = 70C Storage Temperature Range Operating Junction Temperature Range DIP-8 SO-8 Value -0.3 to +7 -0.3 to V++0.3 -12.5 to +0.3 -11 to +0.3 -11 to +0.3 -0.3 to V++0.3 2 725 470 -55 to +150 -40 to +125 Unit V V V V V V A mW C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-case DIP-8 2 SO-8 8 Unit C/W CONNECTION DIAGRAM (top view) PIN DESCRIPTION Pin N 1 2 3 4 5 6 7 8 Symbol SHDN VREF SS CC VOUT GND LX VIN Reference Output Voltage Soft Start Compensation Input Negative Output Voltage Ground Switch Output Positive Supply - Voltage Input Name and Function SHUT-DOWN Control (VCC=ON GND=Shutdown 2/9 ST735 ORDERING CODES TYPE ST735 DIP-8 ST735CN SO-8 ST735CD SO-8 (T&R) ST735CD-TR TYPICAL APPLICATION CIRCUIT NOTE: 1) All capacitors are X7R ceramic 2) C5 can be omitted if are used higher values for the input and output capacitors C2=47F, C1=100pF. 3/9 ST735 ELECTRICAL CHARACTERISTICS (Refer to test circuit, VIN=5V, CIN = 4.7F, COUT = 10F, L = 10H, Tamb = -40 to 125C, unless otherwise specified. Typical value are referred at Tamb= 25C) Symbol VIN VOUT Parameter Input Voltage Output Voltage VIN = 4.5V to 6.2V IOUT = 0 to 200mA Tamb= -40 to 125C VIN = 4.0V to 6.2V IOUT = 0 to 175mA Tamb= -40 to 125C IOUT Output Current VIN = 4.5V to 6.2V Tamb= 0 to 125C VIN = 4.5V to 6.2V IOUT = 0 to 175mA Tamb= -40 to 125C VIN = 4.0V ISUPPLY ISC VLO VOUT VOUT VREF VREF RDSON ILEAK ISH VIL VIH fOSC RCC Supply Current Short Circuit Current Undervoltage Lock-out Line Regulation Load Regulation Reference Voltage Reference Drift LX ON Voltage LX Leakage Current Shutdown Pin Current Shutdown Input Low Threshold Shutdown Input High Threshold Maximum Oscillator Frequency Efficency Compensation Pin Impedance on CC Pin VDS = 10V VIN = 4.0V to 6.2V IOUT = 0 to 200mA Tamb= 25C (Note 1) Tamb= -40 to 125C ISTANDBY Standby Current VSHDN = 0V VOUT = -5V Includes Switch Current Test Conditions Min. 4 -5.25 -5.25 200 175 175 0.8 1 1.5 3.5 0.1 0.003 1.247 50 0.5 1 1 0.25 2 160 IOUT = 100mA 72 7.5 4 1.6 10 -5 -5 275 Typ. Max. 6.2 -4.75 -4.75 Unit V V V mA mA mA mA A A V %/V %/mA V ppm/C A A V V KHz % K Note1 : Tested at IVREF = 0mA 4/9 ST735 TYPICAL CHARACTERISTICS (Referred to typical application circuit, Tamb=25C unless otherwise specified) Figure 1 : Output Voltage vs Temperature Figure 4 : Efficency vs Temperature Figure 2 : Reference Voltage vs Temperature Figure 5 : Efficency vs Ouput Current Figure 3 : Oscillator Frequency vs Temperature Figure 6 : Supply Current vs Temperature 5/9 ST735 Figure 7 : Supply Current vs Input Voltage Figure 10 : Switch Current Limit vs Soft Start Voltage Figure 8 : Shutdown Threshold vs Temperature Figure 11 : LX On Resistance vs Temperature Figure 9 : Peak Inductor Current vs Output Current Figure 12 : LX On Resistance vs Input Voltage 6/9 ST735 Plastic DIP-8 MECHANICAL DATA mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch P001F 7/9 ST735 SO-8 MECHANICAL DATA DIM. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.149 0.015 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019 0016023 8/9 ST735 Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com 9/9 |
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