STODD03QTR

STODD03 Monolithic 2-channel power management for high-definition ODD with integrated power switch Features ■ 1.2 MHz DC-DC current mode PWM converter ■ Input voltage from 4 V up to 6 V ■ Step-down 3.3 V fixed output voltage, up to 700 mA load ■ Step-up output current up to 500 mA ■ 2% step-down output voltage tolerance ■ 3% step-up output voltage tolerance ■ Synchronous rectification ■ Step-down power-save mode at light load ■ Typical efficiency: 90% ■ Internal soft-start ■ Enable functions ■ True cutoff function for step-up converter ■ Integrated motor control power switch ■ Uses tiny capacitors and inductors ■ Available in QFN16 (4 x 4 mm) QFN16L (4 x 4 mm) Description The STODD03 is a 2-channel power management device intended for Blu-Ray applications based on high density optical storage devices. It integrates one step-down converter able to provide 3.3 V fixed output voltage up to 700 mA load, and one step-up converter to provide the power supply needed for the blue laser in applications where only 5 V input voltage is available. The step-up output voltage is adjustable in the range from 6.5 V to 14 V, with current capability up to 500 mA. Both step-down and step-up channels integrate low RDS_ON Nchannel and P-channel MOSFETs, allowing high DC-DC efficiencies. The enable function with true Table 1. shutdown makes the step-up section particularly suitable for optical storage power management applications. Moreover, the STODD03 has a 1 A integrated power switch for motor control power supply. The high switching frequency allows the use of tiny SMD components. Low output ripple voltage is achieved thanks to the current mode PWM topology. The device includes soft-start control, thermal shutdown, and peak current limit to prevent damage due to accidental overload. The STODD03 is packaged in a QFN16 (4 x 4 mm). Device summary Part number Order code Marking Package STODD03 STODD03PQR ODD03 QFN16 (4 x 4 mm) August 2011 Doc ID 018980 Rev 1 1/16 www.st.com 16 Contents STODD03 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 Doc ID 018980 Rev 1 STODD03 Block diagram 1 Block diagram Figure 1. Block diagram SW1 14 EN1 15 Step-up control block 12 Out1 Step Up 2 FB1 VIN_A 3 VIN_P 7 EN2 4 VIN_PSW 6 EN SW 13 EN SW 16 8 SW2 Step Down 10 FB2 5 PSW OUT Power Switch Power Switch Control block 1,9,11 GND Doc ID 018980 Rev 1 AM09305v1 3/16 Absolute maximum ratings STODD03 2 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit VIN_P Power supply input voltage -0.3 to 7 V VIN_PSW Power switch input voltage -0.3 to 7 V VIN_A Analog supply input voltage -0.3 to 7 V ENXX All enable pins voltage -0.3 to VIN_A V SW1 Ch1 input switching pin -0.3 to 16 V SW2 Ch2 output switching pin -0.3 to 7 V PSWOUT Power switch output pin -0.3 to 7 V 1.2 A Ch1 output voltage pin -0.3 to 16 V FB1 Ch1 feedback voltage pin -0.3 to 2.5 V FB2 Ch2 feedback voltage pin -0.3 to 5 V TSTG Storage temperature range -50 to 150 °C TOP Operating junction temperature range -25 to 125 °C ISW OUT1 Power switch max output current Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. All values are referred to gnd. Table 3. Thermal data Symbol 4/16 Parameter Value Unit RthJC Thermal resistance junction-case 2.5 °C/W RthJA Thermal resistance junction-ambient 46 °C/W Doc ID 018980 Rev 1 STODD03 Pin configuration 3 Pin configuration Figure 2. Pin connections (top view) Table 4. Pin description Pin number Symbol Function 1 GND_P1 2 FB1 3 VIN_A Power supply for internal analog circuits 4 EN2 Step-down enable pin. Connect to VIN_A if not used. 5 PSWOUT Power switch output pin. PSWOUT output current is not internally limited. Do not exceed 1 A max. 6 VIN_PSW Power switch input 7 VIN_P Power input voltage 8 SW2 Step-down switching pin (ch2) 9 GND_P2 10 FB2 11 GND_A 12 OUT1 13 EN-SW 14 SW1 Step-up switching pin (ch1) 15 EN1 Step-up enable pin. Step-up is enabled if EN1 > 1.2 V and EN-SW is set low (see also Table 6: Step-up EN1 and EN-SW truth table). When the step-up is disabled, no current will flow to the load thanks to the true-shutdown function. 16 EN-SW epad Epad Power ground pin (ch1) Step-up feedback pin (ch1) Power ground (ch2) Step-down feedback (ch2) Analog ground pin Step-up output voltage Power switch enable pin active high (see Table 5) Power switch Enable pin active low (see Table 5) Exposed pad to be connected to a suitable gnd layer area, through vias, for thermal heat dissipation. Doc ID 018980 Rev 1 5/16 Pin configuration Table 5. Power switch truth table Table 6. 6/16 STODD03 EN-SW EN-SW Power switch status H H Open L L Open L H Open H L Close Step-up EN1 and EN-SW truth table EN-SW EN1 EN-SW Step-up output status x H H OFF x L H OFF x L L OFF x H L ON Doc ID 018980 Rev 1 STODD03 4 Typical application Typical application Figure 3. V Application circuit L1 C1 IN SW1 5V 14 EN1 15 VOUT1 Out1 12 Step-up control block R1 Step Up 2 FB1 6.5 V – 14 V C4 R2 VIN_A SW2 3 C3 VIN_P VOUT2 3.3 V Step Down FB2 7 C2 L2 8 10 C5 EN2 4 VIN_PSW 5 PSW OUT 6 Power Switch EN SW 13 EN SW 16 Power Switch Control block 1,9,11 GND AM09306v1 List of external components (1) Table 7. Component Value Recommended part number C1, C2, C3 10 µF Murata, GRM21BR61A106KE19L C4, C5 22 µF Murata, GRM32ER61C226KE20L L1 4.7 µH Coilcraft, LPS6225-472MLB L2 3.3 µH Coilcraft, LPS4018-332MLB R1, R2 33 kΩ, 3.3 kΩ VOUT1 = 8.8 V (2) 1. The components listed above refer to a typical applications circuit. Operation of the STODD03 is not limited to the choice of these external components. If a different solution is used, it is recommended to validate the suitability of the external components by thoroughly testing the application on a PCB evaluation board. 2. R1 and R2 are calculated according to the following formula: R1 = R2 x [(VOUT1 / VFB1)- 1]. Resistors in the range of 1 k to 50 k are recommended. Doc ID 018980 Rev 1 7/16 Electrical characteristics 5 STODD03 Electrical characteristics Refer to the typical application circuit, VIN_P = VIN_A = VIN_PSW = VEN1,2 = 5 V, VOUT1 = 9 V, VOUT2 = 3.3 V, C1,2,3 = 10 µF, C4,5 = 22 µF, L1 = 4.7 µH, L2 = 3.3 µH, TJ = - 25 to 125 °C (unless otherwise specified, typical values are given at TJ = 25 °C). Table 8. Electrical characteristics Symbol VIN ISUPPLY Parameter Test conditions Input voltage range Supply current Min. Typ. 4 Max. Unit 6 V VEN1,2 > 1.2 V, no switching 1.6 2 mA VEN1,2 < 0.4 V, no switching 1.2 2 mA 14 V 0.824 V 3 % Step-up section VOUT Output voltage range 6.5 Feedback voltage TJ = 0 to 85 °C 0.776 Feedback voltage accuracy TJ = 0 to 85 °C -3 Feedback current VFB1= 0 V, VEN1 = 2 V Output leakage current VEN= 0 V, TJ = 0 to 80 °C VOUT1 OVP Overvoltage protection (1) VFB1= 0 V RDSon_N Internal N-channel RDSon ISW1=400 mA 300 RDSon_P Internal P-channel RDSon ISW1=400 mA 300 ISW1 (leak) Internal leakage current VSW1= 4 V, VFB1= 2 V, VEN1 = 0 V ISW1 (LIM) SW current limitation VOUT1= 9.2 V PWM fs Oscillator frequency to be measured on SW1 pin Max oscillator duty cycle on SW1 pin, VFB1 = 0.7 V VFB1 IFB1 IOUT1_OFF (leak) DMAX ν Efficiency 0.8 600 14.8 15.3 nA 20 µA 15.8 V mΩ 2 µA 2.6 A 0.75 1.2 70 90 IOUT1 = 50 mA, VOUT1 = 7 V 80 IOUT1 = 500 mA, VOUT1 = 7 V 85 IOUT1 = 100 mA, VOUT1 = 9 V 75 IOUT1 = 500 mA, VOUT1 = 9 V 85 1.5 MHz % % VEN1_H Enable threshold high VIN = 4 to 6 V VEN1_L Enable threshold low VIN = 4 to 6 V Enable pin current VEN1 = VIN = 5 V Line transient response (2) VIN from 4 to 6 V, IOUT1 = 500 mA, tR = tF => 30 µs, TJ = 25 °C -5 5 % VOUT ΔVOUT1/ΔIOUT Load transient response (2) VIN = 5 V, IOUT1 from 100 mA to 500 mA, tR = tF => 5µs, TJ= 25 °C -5 5 % VOUT ΔVOUT1/ΔVIN Startup transient (2) VIN from 0 to 5 V, IOUT1= 500 mA -10 10 % VOUT Startup time VEN1 from 0 to 5 V, IOUT1=100mA 500 µs Inrush current VOUT=9.25 V, IOUT=100 mA 1.3 A IEN1 ΔVOUT1/ΔVIN tSTART 8/16 Doc ID 018980 Rev 1 1.2 V 0.4 2 µA STODD03 Table 8. Electrical characteristics Electrical characteristics (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit 3.23 3.3 3.37 V 15 20 µA Step-down section FB2 Feedback voltage TJ = 0 to 85 °C IFB2 FB2 pin bias current VFB2 = 3.5 V IOUT2 Output current (2) (3) VIN = 4 to 6 V 700 mA 0 mA IOUT_MIN Minimum output current ΔVOUT2 Reference load regulation (2) 10 mA < IOUT2 < 0.5 A 5.5 PWM fS PWM switching frequency 1.2 MHz 0.032 %VOUT /VIN 94 % 1.5 A %VOUT2/ΔVIN Reference line regulation 4 V < VIN < 6 V Maximum duty cycle ISWL Switching current limitation ILKP2 PMOS leakage current VFB2 = 3.5 V, VSW2 = GND, TJ = 0 to 80 °C 0.1 µA ILKN2 NMOS leakage current VFB2 = 3.5 V, VSW2 = 5 V, TJ = 0 to 80 °C 0.1 µA RDSon-N NMOS switch-on resistance ISW = 250 mA 0.2 Ω RDSon-P PMOS switch-on resistance ISW = 250 mA 0.3 Ω ΔVOUT2/ ΔIOUT2 Load transient response (2) 100 mA < IOUT2 < 500 mA, tR = tF => 100 ns, TJ = 25 °C Efficiency -5 +5 VOUT = 3.3 V, IOUT = 100 mA 75 VOUT = 3.3 V, IOUT = 500 mA 85 VEN2_H Enable threshold high VIN = 4 to 6 V VEN2_L Enable threshold low VIN = 4 to 6 V Enable pin current VEN2 = VIN = 5 V IEN2 85 mV DMAX ν VFB2 = 3.0 V 15 %VOUT % 1.2 V 0.4 2 µA 0.3 Ω Power switch section RDSon-P PMOS switch-on resistance ISW Switching operating current ILKSW VIN_PSW Switching leakage current ISW = 250 mA 1 EN_SW = EN_SW = H, TJ = 0 to 80 °C Input voltage range 4 VEN_SW_H Enable pins threshold high VIN = 4 to 6 V VEN_SW_L Enable pins threshold low VIN = 4 to 6 V Enable pins current VEN_SW = VIN = 5 V IEN_SW 1 Doc ID 018980 Rev 1 A µA 6 V 1.2 V 0.4 2 µA 9/16 Electrical characteristics Table 8. STODD03 Electrical characteristics (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit 130 150 °C 15 °C Thermal section TSHDN THYS Thermal shutdown (2) Thermal shutdown hyst. (2) 1. If VOUT1 > OVP, the device stops switching. 2. Guaranteed by design, but not tested in production. 3. VOUT = 90% of nominal value 10/16 Doc ID 018980 Rev 1 STODD03 6 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions, and product status, are available at www.st.com. ECOPACK is an ST trademark. Table 9. QFN16 (4 x 4 mm) mechanical data mm. Dim. Min. Typ. Max. A 0.80 0.90 1.00 A1 0.00 0.02 0.05 A3 0.20 b 0.25 0.30 0.35 D 3.90 4.00 4.10 D2 2.50 E 3.90 E2 2.50 e L 2.80 4.00 4.10 2.80 0.65 0.30 Doc ID 018980 Rev 1 0.40 0.50 11/16 Package mechanical data Figure 4. STODD03 QFN16 (4 x 4 mm) drawing 7571203_A 12/16 Doc ID 018980 Rev 1 STODD03 Package mechanical data Tape & reel QFNxx/DFNxx (4x4) mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 330 C 12.8 D 20.2 N 99 13.2 Max. 12.992 0.504 0.519 0.795 101 T 3.898 3.976 14.4 0.567 Ao 4.35 0.171 Bo 4.35 0.171 Ko 1.1 0.043 Po 4 0.157 P 8 0.315 Doc ID 018980 Rev 1 13/16 Package mechanical data Figure 5. 14/16 STODD03 QFN16 (4 x 4 mm) recommended footprint Doc ID 018980 Rev 1 STODD03 Revision history 7 Revision history Table 10. Document revision history Date Revision 30-Aug-2011 1 Changes First release. Doc ID 018980 Rev 1 15/16 STODD03 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. 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