Description
TPS54383, TPS54386 , www.ti.com SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET 1 FEATURES CONTENTS Device Ratings Electrical Characteristics Device Information Application Information Design Examples Additional References 2 3 9 12 32 44 • 4.5-V to 28-V Input Range • Output Voltage Range 0.8 V to 90% of Input Voltage • Output Current Up to 3 A • Two Fixed Switching Frequency Versions: – TPS54383: 300 kHz – TPS54386: 600 kHz • Three Selectable Levels of Overcurrent Protection (Output 2) • 0.8-V 1.5% Voltage Reference • 2.1-ms Internal Soft Start • Dual PWM Outputs 180° Out-of-Phase • Ratiometric or Sequential Startup Modes Selectable by a Single Pin • 85-mΩ Internal High-Side MOSFETs • Current Mode Control • Internal Compensation (See Page 16) • Pulse-by-Pulse Overcurrent Protection • Thermal Shutdown Protection at +148°C • 14-Pin PowerPAD™ HTSSOP package 23 DESCRIPTION The TPS54383 and TPS54386 are dual output, non-synchronous buck converters capable of supporting 3-A output applications that operate from a 4.5-V to 28-V input supply voltage, and require output voltages between 0.8 V and 90% of the input voltage. With an internally-determined operating frequency, soft start time, and control loop compensation, these converters provide many features with a minimum of external components. Channel 1 overcurrent protection is set at 4.5 A, while Channel 2 overcurrent protection level is selected by connecting a pin to ground, to BP, or left floating. The setting levels are used to allow for scaling of external components for applications that do not need the full load capability of both outputs. The outputs may be enabled independently, or may be configured to allow either ratiometric or sequential startup sequencing. Additionally, the two outputs may be powered from different sources. VIN APPLICATIONS • • • • Set Top Box Digital TV Power for DSP Consumer Electronics TPS54383 1 2 OUTPUT1 3 4 5 6 7 SW1 GND EN1 EN2 FB1 GND UDG-07123 PVDD1 BOOT1 PVDD2 14 BOOT2 13 OUTPUT2 SW2 12 BP 11 SEQ 10 ILIM2 FB2 9 8 1 2 3 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. Copyright © 2007, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. TPS54383, TPS54386 , SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION (1) PART NUMBER TPS54383PWP 300 TPS54383PWPR Plastic 14-Pin HTSSOP TPS54386PWP 600 TPS54386PWPR Tape and Reel 2000 Tube 90 Tape and Reel 2000 OPERATING FREQUENCY (kHz) PACKAGE MEDIA Tube UNITS (Pieces) 90 (1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. DEVICE RATINGS ABSOLUTE MAXIMUM RATINGS (1) VALUE PVDD1, PVDD2, EN1, EN2 BOOT1, BOOT2 SW1, SW2 Input voltage range SW1, SW2 transient (< 50ns) BP SEQ, ILIM2 FB1, FB2 SW1, SW2 output current BP load current Tstg TJ Storage temperature Operating temperature Soldering temperature 30 VSW+ 7 –2 to 30 –3 to 31 6.5 –0.3 to 6.5 –0.3 to 3 7 35 –55 to +165 –40 to +150 +260 °C A mA V UNIT (1) Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability. RECOMMENDED OPERATING CONDITIONS MIN VPVDD2 TJ Input voltage Operating junction temperature 4.5 –40 MAX 28 +125 UNIT V °C ELECTROSTATIC DISCHARGE (ESD) PROTECTION MIN Human body model CDM Machine Model 2k 1.5k 250 V UNIT PACKAGE DISSIPATION RATINGS (1) (2) (3) PACKAGE Plastic 14-Pin HTSSOP (PWP) THERMAL IMPEDANCE JUNTION-TO-THERMAL PAD (°C/W) 2.07 (4) TA = +25°C POWER RATING (W) 1.6 TA = +85°C POWER RATING (W) 1.0 (1) (2) (3) (4) For more information on the PWP package, refer to TI Technical Brief (SLMA002A). TI device packages are modeled and tested for thermal performance using printed circuit board designs outlined in JEDEC standards JESD 51-3 and JESD 51-7. For application information, see the Power Derating section. TJ-A = +40°C/W. 2 Submit Documentation Feedback Product Folder Link(s): TPS54383 TPS54386 Copyright © 2007, Texas Instruments Incorporated TPS54383, TPS54386 , www.ti.com SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 ELECTRICAL CHARACTERISTICS –40°C ≤ TJ ≤ +125°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted. PARAMETER INPUT SUPPLY (PVDD) VPVDD1 VPVDD2 IDDSDN IDDQ IDDSW VUVLO VUVLO(hys) tSTART (1) (2) ENABLE (EN) VEN1 VEN2 IEN1 IEN2 tEN (1) BP BPLDO IBP (1) TEST CONDITIONS MIN TYP MAX UNIT Input voltage range Shutdown Quiescent, non-switching Quiescent, while-switching Minimum turn-on voltage Hysteresis Time from startup to softstart begin CBP = 10 µF, EN1 and EN2 go low simultaneously VEN1 = VEN2 = VPVDD2 VFB = 0.9 V, Outputs off SW node unloaded; Measured as BP sink current PVDD2 only 4.5 70 1.8 5 3.8 4.1 400 2 28 150 3.0 V µA mA 4.4 V mV ms Enable threshold Hysteresis Enable pull-up current Time from enable to soft-start begin VEN1 = VEN2 = 0 V Other EN pin = GND 0.9 1.2 50 6 10 1.5 V mV 12 µA µs BP REGULATOR (BP) Regulator voltage Dropout voltage Regulator external load Regulator short circuit 4.5 V < PVDD2 < 28 V TPS54383 TPS54386 10 20 8 V < PVDD2 < 28 V PVDD2 = 4.5 V; switching, no external load on BP 5 5.25 400 2 30 5.6 V mV mA IBPS OSCILLATOR fSW tDEAD (1) VFB1 VFB2 IFB1 IFB2 gM1 (1) Switching frequency Clock dead time 255 510 310 630 140 375 750 kHz ns ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF) Feedback input voltage 0°C < TJ < +85°C –40°C < TJ < +125°C 788 786 3 800 812 812 50 mV Feedback input bias current nA µS gM2 (1) TSS1 TSS2 ICL1 ICL2 VUV1 VUV2 THICCUP (1) tON1(oc) (1) tON2(oc) (1) Transconductance 30 SOFT START (SS) Soft start time 1.5 2.1 2.7 ms OVERCURRENT PROTECTION Current limit channel 1 VILIM2 = VBP Current limit channel 2 VILIM2 = (floating) VILIM2 = GND Low-level output threshold to declare a fault Hiccup timeout Minimum overcurrent pulse width Measured at feedback pin. 3.6 3.6 2.4 1.15 4.5 4.5 3.0 1.50 670 10 90 150 5.6 5.6 3.6 1.75 mV ms ns A (1) (2) Ensured by design. Not production tested. When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower BP capacitor value. More information can be found in the Input UVLO and Startup section. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS54383 TPS54386 3 TPS54383, TPS54386 , SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 www.ti.com ELECTRICAL CHARACTERISTICS (continued) –40°C ≤ TJ ≤ +125°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted. PARAMETER BOOTSTRAP RBOOT1 RBOOT2 Bootstrap switch resistance From BP to BOOT1 or BP to BOOT2, IEXT = 50 mA 18 Ω TEST CONDITIONS MIN TYP MAX UNIT OUTPUT STAGE (Channel 1 and Channel 2) RDS(on) (3) tON(min) (3) DMIN DMAX ISW TSD (3) TSD(hys) (3) MOSFET on resistance plus bond wire resistance Minimum controllable pulse width Minimum Duty Cycle Maximum Duty Cycle Switching node leakage current (sourcing) TJ = +25°C, VPVDD2 = 8 V –40°C < TJ < +125°C, VPVDD2 = 8 V ISWx peak current > 1 A (4) VFB = 0.9 V TPS54383 fSW = 300 kHz TPS54386 fSW = 600 kHz Outputs OFF 90 85 95 90 2 12 85 85 100 165 200 0 mΩ ns % % % µA THERMAL SHUTDOWN Shutdown temperature Hysteresis 148 20 °C (3) (4) Ensured by design. Not production tested. See Figure 14 for ISWx peak current <1 A. 4 Submit Documentation Feedback Product Folder Link(s): TPS54383 TPS54386 Copyright © 2007, Texas Instruments Incorporated TPS54383, TPS54386 , www.ti.com SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS QUIESCENT CURRENT (NON-SWITCHING) vs JUNCTION TEMPERATURE SHUTDOWN CURRENT vs JUNCTION TEMPERATURE 2.1 VBP = 5.25 V 140 VPVDDx = 28 V 2.0 IDDQ - Quiescent Current - mA ISD - Shutdown Current - mA 120 VPVDDx = 12 V 100 1.9 80 1.8 60 1.7 40 VPVDDx = 4.5 V 1.6 20 1.5 -50 -25 0 25 50 75 100 125 0 -50 -25 0 25 50 75 100 125 TJ - Junction Temperature - °C TJ - Junction Temperature - °C Figure 1. UNDERVOLTAGE LOCKOUT THRESHOLD vs JUNCTION TEMPERATURE Figure 2. ENABLE THRESHOLDS vs JUNCTION TEMPERATURE 4.2 1.25 EN(Off) VEN - Enable Threshold Voltage - V VUVLO - Undervoltage Lockout - V 4.1 UVLO(On) 4.0 1.23 1.21 3.9 UVLO(Off) 3.8 1.19 EN(On) 1.17 3.7 3.6 -50 -25 0 25 50 75 100 125 1.15 -50 -25 0 25 50 75 100 125 TJ - Junction Temperature - °C TJ - Junction Temperature - °C Figure 3. Figure 4. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TPS54383 TPS54386 5 TPS54383, TPS54386 , SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007 www.ti.com TYPICAL CHARACTERISTICS (continued) SOFT START TIME vs JUNCTION TEMPERATURE SWITCHING FREQUENCY (300 kHz) vs JUNCTION TEMPERATURE 3.5 VBP = 5.25 V 350 VBP = 5.25 V tSS - Soft Start Time - ms 3.0 fPWM - PWM Frequency - kHz 330 2.5 310 2.0 290 1.5 -50 -25 0 25 50 75 100 125 270 -50 -25 0 25 50 75

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