SD6201-AF

Synchronous Boost DC/DC Regulator Features








SD6201 Description Up to 94% Efficiency The SD6201 is high efficiency synchronous, Low voltage start-up 0.9V PWM step-up DC/DC converters optimized to Shut-down current: < 1µA provide a high efficient solution to medium Input voltage 0.9V 4.4V power systems. The devices work under the ： ： ～ Output voltage：2.5V～4.3V (Up to 5V with Schottky) Low switch on resistance RDS(ON), Internal switch: 0.35 Ω input voltage between 0.9V and 4.4V with a 1.4MHz fixed frequency switching. These features minimize overall solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Automatic PWM/PFM 1.4MHz fixed frequency switching mode switching at light load saves power and Automatic PWM/PFM mode switching improves efficiency. Low profile SOT-23-6L package (lead-free The SD6201 is capable of supplying an output packaging is now available) voltage between 2.5V and 4.3V, the internal synchronous switch is desired to provide high Applications





efficiency without Schottky. Digital cameras and MP3 The SD6201 regulators are available in the Palmtop computers / PDAs industry standard SOT-23-6L power packages Cellular phones (or upon request). Wireless handsets and DSL modems PC cards Portable media players Order Information SD6201 - ①② Symbol Description ① Denotes Output voltage: ② Denotes Package Types: A : Adjustable Output F: SOT-23-6L www.shouding.net 1 SD6201 Typical Applications L 2.2uH DC+ 1 0.9V to 4.4V SW 6 CIN 20uF VOUT 5 VOUT VIN R1 3 4 EN FB COUT 20uF R2 GND 2 Figure 1: Typical Application Circuit L 2.2uH D 1 SINGLE AA CELL + CIN 4.7uF SW 6 5 VIN M1 SI2305DS VOUT VOUT R3 4 OFF ON EN FB 3 510K COUT 4.7uF GND 2 R4 R1 1.02M R2 604K Q1 2N3904 510K Figure 2: Single Cell to 3.3V Synchronous Boost Converter with Load Disconnect in Shutdown. www.shouding.net 2 SD6201 2 L 4.7uH Ω OPTIONAL SNUBBER 1nF D 1 LITHIUM CELL + CIN 4.7uF SW VOUT 5 6 VIN VOUT R1 4 OFF ON EN FB 1.02M 3 COUT 4.7uF GND 2 100pF R2 332K Figure 3: Single Lithium Cell to 5V with Load 250mA C1 1uF L 4.7uH 1 SW SINGLE AA CELL 6 CIN 10uF 5 VOUT VIN 4 EN FB GND 3 R1 1.02M R2 750K D1 D2 COUT1 10uF VOUT1 3V 90mA COUT2 10uF 2 VOUT2 -3V 10mA Figure 4: Single Cell AA Cell to www.shouding.net ±3V Synchronous Boost Converter 3 SD6201 Pin Assignment TOP VIEW VIN 6 1 SW VOUT 5 PIN Number EN 4 2 GND PIN Name Function 1 SW Switch Output 2 GND Ground 3 FB Feedback 4 EN 5 VOUT Output 6 VIN Input SOT-23- 6L 3 FB ON/OFF Control (High Enable) SOT-23-6L * Marking:HXN-Xh Absolute Maximum Ratings






（Note 1） ～ + 6.6V V ………………………………………………...……………………………....- 0.3 V ～ + 6.6V V …….…………………………………..…………………………………………- 0.3 V ～ + 6.6 V V …………………………………………...………………………………………- 0.3 V ～ + 6.6 V Operating Temperature Range （Note 2）…………………………………………- 30℃ ～ + 85℃ Lead Temperature (Soldering 10 sec.) ……………………………………………………+ 300℃ Storage Temperature Range …………………………………...………………..- 65℃ ～ + 125℃ VIN ……………………………………………………………………………………..- 0.3 V OUT SW EN Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The SD6201 are guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the – 30°C to 85°C operating temperature range are assure d by design, characterization and correlation with statistical process controls. www.shouding.net 4 SD6201 Electrical Characteristics Operating Conditions: TA=25 ℃, V PARAMETER IN=1.2V, VOUT=3.3V unless otherwise specified. CONDITIONS Output Voltage Range (Adj.) Minimum Start-Up MIN TYP MAX UNITS 5 V 2.5 Voltage (Note 3) Minimum Operating Voltage ILOAD = 1mA 0.9 1.1 V EN = VIN 0.6 0.75 V 1.1 1.4 1.7 MHz 80 87 1.165 1.212 Switching Frequency Max Duty Cycle VFB = 1.15V Feedback Voltage % 1.241 Feedback Input Current VFB = 1.22V (Note 4) NMOS Switch Leakage VSW = 5V 0.1 5 µA PMOS Switch Leakage VSW = 0V 0.1 5 µA NMOS Switch On Resistance VOUT = 3.3V 0.35 Ω PMOS Switch On Resistance VOUT = 3.3V 0.45 Ω 850 mA 260 µA NMOS Current Limit Quiescent Current Shutdown Current 1 V 700 ILOAD = 0mA VEN=0V, Including Switch nA 0.1 1 Leakage En Input High 1 V En Input Low En Input Current VEN = 5.5V µA 0.01 0.5 V 1 µA Note 3: Minimum VIN operation after start-up is only limited by the battery’s ability to provide the necessary power as it enters a deeply discharged state. Note 4: Specification is guaranteed by design and not 100% tested in production. www.shouding.net 5 SD6201 Typical Performance Characteristics Efficiency vs. Output Current (Vout=3.3V) 100 90 90 80 80 VIN=1.5V VIN=1V 70 Efficiency (%) Efficiency (%) 100 60 VIN=1.2V 50 40 30 V IN =2V VIN =2.7V 50 40 30 10 10 0 0 100 VIN=2.5V 60 20 100 1000 10 100 1000 Output Current (mA) Output Current (mA) Efficiency vs. Output Current (Vout=4.2V) Efficiency vs. Output Current (Vout=5V) 100 90 90 80 80 VIN =3V 70 60 Efficiency (%) Efficiency (%) 70 20 10 Efficiency vs. Output Current (Vout=3.3V) VIN =2V 50 40 30 70 50 40 30 20 10 10 0 0 100 Output Current (mA) www.shouding.net 1000 VIN =2V 60 20 10 V IN =3.6V 10 100 Output Current (mA) 6 1000 SD6201 Pin Description SW (Pin1): Switch Pin. Connect inductor between SW and VIN. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. GND (Pin 2): Signal and Power Ground. Provide a short direct PCB path between GND and the (–) side of the output capacitor(s). FB (Pin 3): Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.212V • [1 + (R1/R2)] EN (Pin 4): Logic Controlled Shutdown Input. EN = High: Normal free running operation, 1.4MHz typical operating frequency. EN = Low: Shutdown, quiescent current