L6925D HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR 1 FEATURES Figure 1. Package ■ 2.7V TO 5.5V BATTERY INPUT RANGE ■ HIGH EFFICIENCY: UP TO 95% ■ INTERNAL SYNCHRONOUS SWITCH ■ NO EXTERNAL SCHOTTKY REQUIRED MSOP8 ■ EXTREMELY LOW QUIESCENT CURRENT Table 1. Order Codes ■ 800mA MAX OUTPUT CURRENT ■ ADJUSTABLE OUTPUT VOLTAGE FROM 0.6V Part Number Package ■ LOW DROP-OUT OPERATION: UP TO100% L6925D MSOP8 (Tube) DUTY CYCLE L6925D013TR Tape & Reel ■ SELECTABLE LOW NOISE/LOW CONSUMPTION MODE AT LIGHT LOAD 2 DESCRIPTION ■ LOW BATTERY INPUT The device is dc-dc monolithic regulator specifically ■ LOW BATTERY OUTPUT designed to provide extremely high efficiency. ■ ±1% OUTPUT VOLTAGE ACCURACY The device has on UVLO set at 2.7V cause it is part- ■ CURRENT-MODE CONTROL icurarly thought for single Li-ion cell applications. ■ 600kHz SWITCHING FREQUENCY Output voltage can be selected by an external divider down to 0.6V. Duty Cycle can saturate to 100% al- ■ EXTERNALLY SYNCHRONIZABLE FROM lowing low drop-out operation. 500kHz TO 1.4MHz ■ OVP The device is based on a 600kHz fixed-frequency, current mode-architecture. Low Consumption Mode ■ SHORT CIRCUIT PROTECTION operation can be selected at light load conditions, al- lowing switching losses to be reduced. L6925D is ex- 1.1 APPLICATIONS ternally synchronizable with a clock which makes it ■ BATTERY-POWERED EQUIPMENTS useful in noise-sensitive applications. ■ PORTABLE INSTRUMENTS LBI pin can be used to have a LBO signal when the ■ CELLULAR PHONES Battery voltage is lower than a preset value. Other features like, Overvoltage protection, Shortcircuit ■ PDAs AND HAND HELD TERMINALS protection and Thermal Shutdown (150°C) are also ■ DSC present. ■ GPS Figure 2. Application Test Circuit V =2.7V to 5.5V SYNC IN 7 L 6.8µH V =1.8V OUT V 5 C1 R2 CC 6 LX 10µF 600K R4 C4 6.3V LBI 1 200K 10µF 6.3V VFB R1 3 100K LBO 8 2 4 R3 COMP GND 100K C2 220pF D01IN1238B Rev. 3 September 2004 1/6

L6925D Table 2. Absolute Maximum Ratings Symbol Parameter Value Unit V6 Input voltage -0.3 to 6 V V5 Output switching voltage -1 to VCC V V1, V8 Low Battery Input, Low Battery Output -0.3 to VCC V V3 Feedback voltage -0.3 to VCC V V2 Error Amplifier Output Voltage -0.3 to VCC V V7 Syncronization / Mode Selector -0.3 to VCC V Ptot Power dissipation at Tamb=70°C 0.45 W Tj Junction operating temperature range -40 to 150 °C Tstg Storage temperature range -65 to 150 °C LX Pin Maximum Withstanding Voltage Range Test Condition: CDF- ±1000 V AEC-Q100-002- “Human Body Model” Acceptance Criteria: Other pins ±2000 V “Normal Performance’ Figure 3. Pin Connection LBI 1 8 LBO COMP 2 7 SYNC VFB 3 6 V CC GND 4 5 LX D01IN1239A/mod Table 3. Thermal Data Symbol Parameter Value Unit Rth j-amb Thermal Resistance Junction to Ambient 180 °C/W Table 4. Pin Functions N Name Description 1 LBI Battery low voltage detector input. The internal threshold is set to 0.6V. The external threshold can be adjusted by using an external resistor divider. 2 COMP Error amplifier output. Compensate it with a 220pF capacitor 3 VFB Error amplifier input. The output voltage can be adjusted by using an external resistor divider connected to this pin (VFB = 0.6V). 4 GND Ground. 5 LX Switch node connection to the inductor. 6 VCC Input voltage. 7 SYNC This pin allows to select Low Noise/ Low Consumption Mode or to sychronize the device. 8 LBO Battery low voltage detector output. If the voltage at the LBI pin drops below the internal thrshold, LBO goes low. The LBO is an open drain output. A pull_up resistor should be connected between the pin and the output voltage 2/6

L6925D Table 5. ELECTRICAL CHARACTERISTICS (TJ = 25°C, VCC = 3.6V unless otherwise specified) Symbol Parameter Test Condition Min Typ Max Unit Vcc Operating input voltage After Turn On 2.7 5.5 V Vcc ON Turn On threshold 2.8 V Vcc OFF Turn Off threshold 2.65 V Vcc hys Hysteresis 150 mV Rp High side Ron Vcc = 3.6V, Ilx =100mA 240 mΩ Rn Low side Ron Vcc = 3.6V, Ilx =100mA 215 mΩ Ilim Peak current limit Vcc = 3.6V 1.2 A Valley current limit Vcc = 3.6V 1.4 A Vout Output voltage range 0.6 Vcc V fosc Oscillator frequency 600 KHz fsync Sync mode clock (*) 500 1400 KHz DC CHARACTERISTICS Iq Quiescent current Vsync = 0V, no load, 230 µA (low noise mode) VFB > 0.6V Quiescent current Vsync = Vcc, no load, 25 µA (low cunsumption mode) VFB > 0.6V Ish Shutdown current Vcc < 2.7V, VFB > 0.6V 0.2 µA Ilx LX leakage current (*) Vcc < 2.7V, VLX = Vcc 1 µA Vcc < 2.7V, VLX = 0V 1 µA ERROR AMPLIFIER CHARACTERISTICS Vfb Voltage feedback 0.593 0.6 0.607 V Ifb Feedback input current (*) VFB = 0.6V 25 nA SYNC/MODE FUNCTION Vsync_H Sync mode threshold high 1.3 V Vsync_L Sync mode threshold low 0.5 V LB SECTION VLBI LBI Threshold 0.6 V VLBO LBO Logic Low Isink = 1mA, Vcc = 3.6V, 0.2 0.4 V VLBI < 0.6V ILK-LBO LBO Leakage Current (*) V LBO = 3.6V, Vcc = 3.6V, 50 nA VLBI > 0.6V PROTECTIONS HOVP Hard overvoltage threshold 10 %Vout (*) Guaranteed by design 3/6

L6925D Figure 4. MSOP8 Mechanical Data & Package Dimensions mm inch DIM. OUTLINE AND MIN. TYP. MAX. MIN. TYP. MAX. MECHANICAL DATA A 1.10 0.043 A1 0.050 0.150 0.002 0.006 A2 0.750 0.850 0.950 0.03 0.033 0.037 b 0.250 0.400 0.010 0.016 c 0.130 0.230 0.005 0.009 D (1) 2.900 3.000 3.100 0.114 0.118 0.122 E 4.650 4.900 5.150 0.183 0.193 0.20 E1 (1) 2.900 3.000 3.100 0.114 0.118 0.122 e 0.650 0.026 L 0.400 0.550 0.700 0.016 0.022 0.028 L1 0.950 0.037 k 0˚ (min.) 6˚ (max.) aaa 0.100 0.004 MSOP8 Note: 1. D and F does not include mold flash or protrusions. (Body 3mm) Mold flash or potrusions shall not exceed 0.15mm (.006inch) per side. 4/6

L6925D Table 6. Revision History Date Revision Description of Changes January 2004 2 First Issue in EDOCS DMS September 2004 3 Changed Style-sheet and Table 2 5/6

L6925D 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. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners © 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 6/6