1-1-2 Switching Mode Regulator ICs SAI Series Surface-Mount, Separate Excitation Step-down Switching Mode Regulator ICs Features Line up * Surface-mount power package Part Number SAI01 SAI02 SAI03 VO(V) 5.0 3.3 12.0 * Output current: 0.4 to 0.5A IO(A) * High efficiency: 75 to 89% * Requires only 4 discrete components SAI06 9.0 0.5 0.4 Absolute Maximum Ratings * Internally-adjusted phase correction and output voltage Parameter * Built-in reference oscillator (60kHz) * Built-in overcurrent and thermal protection circuits Symbol Ratings DC Input Voltage VIN 35 Unit V Power Dissipation PD 0.75 W C Junction Temperature Tj +125 Storage Temperature Tstg -40 to +125 C Thermal Resistance(junction to case) j-c 20 C/W Applications * Power supplies for telecommunication equipment * Onboard local power supplies Recommended Operating Conditions Ratings Parameter Symbol DC Input Voltage Range VIN Output Current Range IO Operating Junction Temperature Range SAI01 SAI02 SAI03 SAI06 7 to 33 5.3 to 28 15 to 33 12 to 33 0 to 0.5 Unit V 0 to 0.4 Tjop A C -30 to +125 Electrical Characteristics (Ta=25C) Ratings Parameter Symbol min. Output Voltage 4.80 Conditions Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Output Voltage Ripple Rejection Overcurrent Protection Starting Current ICs f Conditions 5.00 5.20 3.17 Conditions RREJ Conditions min. 3.30 3.43 11.40 SAI03 typ. max. min. 12.00 12.60 8.55 VIN=24V, IO=0.3A SAI06 typ. max. 9.00 9.45 75 88 86 VIN=15V, IO=0.3A VIN=24V, IO=0.3A VIN=21V, IO=0.3A 60 60 60 60 VIN=15V, IO=0.3A 100 60 VIN=24V, IO=0.3A 80 100 VIN=8 to 28V, IO=0.3A 40 20 70 90 50 VIN=15V, IO=0.1 to 0.4A VIN=24V, IO=0.1 to 0.4A VIN=21V, IO=0.1 to 0.4A 0.5 0.5 1.5 1.0 45 45 45 45 f=100 to 120HZ f=100 to 120HZ f=100 to 120HZ f=100 to 120HZ 0.55 VIN=10V 0.45 VIN=8V % kHZ 110 mV VIN=15 to 30V, IO=0.3A 95 VIN=20V, IO=0.1 to 0.4A 0.55 V VIN=21V, IO=0.3A 130 VIN=18 to 30V, IO=0.3A 30 Unit VIN=21V, IO=0.3A 80 30 Conditions max. VIN=15V, IO=0.3A VIN=10 to 30V, IO=0.3A VO/Ta SAI02 typ. VIN=20V, IO=0.3A 80 VOLOAD Conditions min. VIN=20V, IO=0.3A VOLINE IS1 max. VIN=20V, IO=0.3A Efficiency 46 VO Conditions SAI01 typ. 80 mV mV/C dB 0.45 VIN=18V VIN=15V A SAI Series External Dimensions (PS4) (unit : mm) 1VIN 4.32 max. 0.25 0.89 b 4.7 a 0.2 +0.15 0.75 -0.05 0.15 2.54 4 .GND 0.2 2 SW 3VOS 1.4 0.2 max. 6.8 3.6 max. 4.0 0.5 8.0 A 0.2 0.25 0.3 -0.05 +0.15 6.3 1.0 Pin Assignment q VIN w SWOUT e VOS r GND Plastic Mold Package Type Flammability: UL94V-0 Product Mass: Approx. 0.22g 0~0.15 0.2 3.0 0.3 0.3 9.8 Typical Connection Diagram Block Diagram VIN a. Part Number b. Lot Number A Case Temperature Measuring Point 1 2 SWOUT OCP 1 VIN Reg. SWOUT VIN SAI OSC VOS TSD Reset Drive C1 100F Comp. + GND 4 L1 2 3.3V 5V : 200H 9V 12V 15V : 300H VO 3 D1 SFPB54 (Sanken) + C2 330F 3 VOS Amp. GND GND VREF 4 GND Ta-PD Characteristics PD=VO*IO 0.8 * Glass epoxy board (95x69x1.2) * Natural air cooling Power Dissipation PD (W) 0.7 0.6 0.5 0.4 -VF*IO 1- VO VIN The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. VO : Output voltage IO : Output current : Efficiency (%) VF : Diode D1 forward voltage SFPB54-0.3V 0.3 0.2 0.1 0 -30 100 -1 0 25 50 75 100 Ambient Temperature Ta (C) 125 Thermal design for D1 must be considered separately. ICs 47 SAI Series Example of Printed Circuit Board VIN a) For optimum operation, there must be only one GND line originating from terminal 4 and each component must be connected with the shortest possible wiring. b) To prevent heating of the IC, it is best to make the GND pattern as large as possible since the internal frame and terminal 4 (GND) are connected to each other. SW 2 1 + L1 DI1 C1 SAI 4 + 3 GND C2 VO Ta-PD Characteristics 0.8 0.7 Power Dissipation PD (W) PD=VO*IO * Glass epoxy substrate (95x69x1.2) * No airflow 0.6 100 -1 -VF*IO 1- VO VIN The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency graph on page 67 and substitute the percentage in the formula above. 0.5 0.4 0.3 0.2 0.1 0 -30 0 25 50 75 100 125 Ambient Temperature Ta (C) VO :Output voltage IO :Output current x :Efficiency (%) VF :Diode forward voltage SFPB54-0.3V Thermal design for D1 must be considered separately. Selecting External Components 1. Inductor L1 1) It must be suited for switching regulators. Do not use inductors such as noise filters, because they generate excessive heat. 2) It must have the appropriate inductance value. If the inductance is too small (150H or lower), abnormal oscillation may occur causing operation problems in the overcurrent protection circuit within the rated current range. 3) The rated current must be satisfied. If the rated current is exceeded, magnetic saturation leads to overcurrent. 2. Capacitors C1 and C2 1) They must satisfy the breakdown voltage and allowable ripple current. Exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnormal oscillation of the IC. 2) C2 should be a low-impedance type capacitor. A low-impedance type capacitor is recommended for C2 to ensure reduced ripple voltage and stable switching operation. 3. Diode D1 The Sanken SFPB54 diode is recommended for D1. If you intended to use an equivalent diode, be sure to use a Schottky Barrier diode and make sure that the reverse voltage applied to terminal 2 of the IC does not exceed the value (-1V) given in the absolute maximum ratings. If you use a fast recovery diode or any other diode, supplying a reverse voltage generated from the recovery or ON voltage of the diode may damage the IC. Application Variable output voltage Output voltage can be adjusted in the same way as SI-8000S in page 77. 66 SAI Series Typical Characteristics Output Voltage(SAI01) Efficiency Characteristics(SAI01) Ta=25C 6 0.1A 2 = VIN V 20V 10 60 25V 33V 3 7V 50 1 8 0 0 10 0.1 Input Voltage VIN (V) 0.4 0 0 0.5 0.1 4.9 f 50 4.8 40 4.7 0.4 0.5 Thermal Protection Characteristics(SAI01) VIN=20V, IO=20mA 5 20V 4 3 2 4 3 2 1 1 0 150 100 0.3 6 V 5.0 0.2 Output Current IO (A) Ta=25C =7 5.1 VO 50 4.8 5 Output Voltage VO (V) 80 0 0.3 6 5.2 0 -50 7V 4.9 Overcurrent Protection Characteristics(SAI01) 5.3 Output Voltage VO (V) 90 60 0.2 VIN VIN=20V, IO=0.3A 70 10V Output Current IO (A) Temperature Characteristics(SAI01) 100 20V VIN=33V 5.0 Output Voltage VO (V) 6 V 4 33 2 5.1 4.7 40 0 0 Efficiency (%) Frequency f (kHz) Output Voltage VO (V) Efficiency (%) IO = 0A 0.5 A Output Voltage VO (V) 5.2 80 70 Ta=25C 5.3 90 5 4 Load Regulation(SAI01) Ta=25C 100 00 0.5 1.0 1.5 0 0 2.0 50 100 150 200 Case Temperature TC (C) Output Current IO (A) Ambient Temperature Ta (C) Note on Thermal Protection: The thermal protection circuit is intended for protection against heat during instantaneous short-circuiting. Its operation is not guaranteed for continuous heating condition such as short-circuiting over extended periods of time. Output Voltage(SAI03) Efficiency Characteristics(SAI03) 100 4A 8 6 V 60 50 2 40 5 10 15 Input Voltage VIN (V) 20 V 33 70 4 0 0 V 24 0.2A 12.2 =1 IN 80 Efficiency (%) 10 0 Ta=25C 12.3 5V 0. 0A 90 IO= Output Voltage VO (V) 12 Load Regulation(SAI03) Ta=25C Output Voltage VO (V) Ta=25C 14 12.1 12.0 VIN=33V 24V 20V 15V 11.9 11.8 0 0.1 0.2 0.3 Output Current IO (A) 0.4 0 0 0.1 0.2 0.3 0.4 Output Current IO (A) 67