SS6612

SS6612 High-Efficiency Synchronous Step-up DC/DC Converter with Selectable Current Limit FEATURES High efficiency (93% with VIN=2.4V, VOUT= 3.3V, IOUT=200mA) Output current up to 500mA. (VIN=2.4V, at VOUT=3.3V, CLSEL=OUT) Quiescent supply current of 20µA Power-saving shutdown mode (0.1µA typical). Internal synchronous rectifier (no external diode required). Selectable current limit for reduced ripple. Low-noise, anti-ringing feature. On-chip low-battery detector. Low-battery hysteresis. Space-saving package: MSOP-10 DESCRIPTION T he SS6 612 is a high - efficiency step-up DC/DC converter, with a start-up voltage as low as 0.8V, and an operating voltage down to 0.7V. Consuming only 20µA of quiescent current, this device includes a built-in synchronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode, and improves overall efficiency by minimizing losses. The switching frequency can range up to 500KHz depending on the load and input voltage. The output voltage can be easily set; by two external resistors for 1.8V to 5.5V; con- APPLICATIONS Palmtop & Notebook Computers. PDAs W ireless Phones Pocket Organizers. Digital Cameras. Hand-Held Devices with 1 to 3 Cells of NiMH/NiCd Batteries. necting FB to OUT to get 3.3V; or connecting to GND to get 5.0V. For additional design flexibility, the peak current of the internal switch is selectable (0.65A or 1.0A). The SS6612 also features a circuit that eliminates noise caused by inductor ringing. TYPICAL APPLICATION CIRCUIT VIN + 47µF OFF SHDN CLSEL SS6612 LBI REF 0.1µF GND LBO FB 200Ω BATT ON LX OUT Output 3.3V, 5.0V or Adj. (1.8V to + 5.5V) up to 300mA 47µF Low-battery Detect Out 22µH Selectable Current Limit (1.0A or 0.65A) Low Battery Detection Rev.2.02 12/06/2003 www.SiliconStandard.com 1 of 16 SS6612 ORDERING INFORMATION S S6 612CXXX P IN CONFIGURATION M SOP - 10 FB 1 P acking T R: T ape and reel P ackage type O: MSOP - 10 T OP VIEW 10 OUT LBI 2 LBO 3 CLSEL 4 REF 5 9 LX 8 GND 7 BATT 6 SHDN Example: S S66 12COTR i n MSO P- 10 p ackage s upplied on tape and reel. ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) Switch Voltage (LX to GND) Battery Voltage (BATT to GND) SHDN , LBO to GND 8.0V VOUT+ 0.3V 6.0V 6.0V VOUT+0.3V -1.5A to +1.5A -1.5A to +1.5A -40°C ~ +85°C -65°C ~150°C LBI, REF, FB, CLSEL to GND Switch Current (LX) Output Current (OUT) Operating Temperature Range Storage Temperature Range TEST CIRCUIT Refer to the typical application circuit. Rev.2.02 12/06/2003 www.SiliconStandard.com 2 of 16 SS6612 ELECTRICAL CHARACTERISTICS (VIN = 2.0V, VOUT = 3.3V (FB = VOUT), RL = ∝, TA = 25°C, unless otherwise specified.) PARAMETER Minimum Input Voltage Operating Voltage Start-Up Voltage Start-Up Voltage Temp. Coeff. Output Voltage Range Output Voltage TEST CONDITIONS MIN. TYP. 0.7 MAX. UNIT V 1.1 RL=3kΩ (Note1) 0.8 -2 VIN