PWM and Linear Controller

® ISL6442 Data Sheet April 7, 2006 FN9204.1 Dual (180° Out-of-Phase) PWM and Linear Controller The ISL6442 is a high-performance, triple output controller that provides a single high-frequency power solution primarily for Broadband, DSL and Networking applications. This device integrates complete control, monitoring and protection functions for two synchronous buck PWM controllers and one linear controller. Input voltage ripple and total RMS input current is substantially reduced by synchronized 180° out-of-phase operation of the two PWMs. The two PWM buck converters provide simple voltage mode control. The output voltage of the converters can be precisely regulated to as low as 0.6V, with a maximum tolerance of ±1.5% over temperature and line variations. Programmable switching frequency up to 2.5MHz provides fast transient response and small external components. The linear controller provides a low-current output. The ISL6442 has voltage-tracking capability. Each controller has soft-start and independent enable functions combined on a single pin. A capacitor from SS/EN to ground sets the soft-start time; pulling SS/EN pin below 1V disables the controller. Both outputs can soft-start into a pre-biased load. The ISL6442 incorporates robust protection features. An adjustable overcurrent protection circuit monitors the output current by sensing the voltage drop across the upper MOSFET rDS(ON). Hiccup mode overcurrent operation protects the DC/DC converters from damage under overload and short circuit conditions. A PGOOD signal is issued when soft-start is complete and PWM outputs are within 10% of their regulated values and the linear regulator output is higher than 75% of its nominal value. Thermal shut-down circuitry turns the device off if the IC temperature exceeds 150°C. Features • 4.5V to 5.5V or 5.5V to 24V Input Voltage Range • ±1.5% PWM Switcher Reference Accuracy Over Line and Temperature • Three Programmable Power Output Voltages - Two PWM Controllers with Out-of-Phase Operation - Voltage-Mode PWM Control - One Linear Controller • Programmable Switching Frequency from 300kHz to 2.5MHz • Fast Transient Response - High-Bandwidth Error Amplifier • Extensive Circuit Protection Functions - Overvoltage, Undervoltage, and Overtemperature - Programmable Overcurrent Limit with Hiccup Mode Operation - Lossless Current Sensing (no Sense Resistor needed) • Externally Adjustable Soft-Start Time - Independent Enable Control - Voltage Tracking Capability - Able to Soft-Start into a Pre-Biased Load • PGOOD Output with Delay • 24 Ld QSOP • Pb-Free Plus Anneal Available (RoHS Compliant) Applications • Complete 1 Chip Solution for DSL Modems/Routers • DSP, ASIC, and FPGA Point of Load Regulation • ADSL, Broadband and Networking Applications Pinout ISL6442 (QSOP) TOP VIEW OCSET1 1 SS1/EN1 2 COMP1 3 FB1 4 RT 5 SGND 6 LCDR 7 LCFB 8 FB2 9 COMP2 10 SS2/EN2 11 OCSET2 12 24 VIN 23 BOOT1 22 UGATE1 21 PHASE1 20 LGATE1 19 VCC 18 PGND 17 LGATE2 16 PHASE2 15 UGATE2 14 BOOT2 13 PGOOD Ordering Information PART NUMBER* ISL6442IA ISL6442IAZ (Note) PART TEMP. MARKING RANGE (°C) ISL6442IA ISL6442IAZ -40 to 85 -40 to 85 PACKAGE PKG. DWG. # 24 Ld QSOP M24.15 24 Ld QSOP M24.15 (Pb-free) * Add “-TK” to suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL6442 Block Diagram VCC VIN VCC REFERENCE BIAS CURRENT 30µA 100µA 0.6V POWER ON RESET AND CONTROL 5V LINEAR REGULATOR 110µA OCSET1 VCC UVP1 OVP1 PG1 EN1 COMP1 OUTPUT1 DRIVERS GATE CONTROL LOGIC VCC DEAD-TIME CONTROL OVERCURRENT PGND RAMP1 0 DEG BOOT1 UGATE1 PHASE1 FB1 0.6V FAULT1 UVP1 OVP1 PG1 EN1 SS1 PWM1 LGATE1 VCC5 30µA VCC5 30µA STARTUP SS1/EN1 SS1 1V DET SS2/EN2 SS2 EN2 EN1 CLOCK AND SAWTOOTH GENERATOR 110µA OCSET2 VCC UVP2 OVP2 PG2 EN2 OUTPUT2 DRIVERS PWM2 GATE CONTROL LOGIC VCC DEAD-TIME CONTROL OVERCURRENT BOOT2 FAULT2 UVP2 OVP2 PG2 EN2 SS2 0.6V FB2 RAMP2 180 DEG UGATE2 PHASE2 LGATE2 COMP2 FAULT3 PGND PG3 RT LCFB PGOOD PG1 PG2 PG3 0.6V LCFB LCDR SGND PGND FIGURE 1. BLOCK DIAGRAM 2 FN9204.1 April 7, 2006 ISL6442 Typical Application Schematics ISL6442 VOLTAGE INPUTS REQUIRED VIN (4.5 to 24V) = VIN1 = VIN2 VCC (5V; internal if VIN > 5.6V) VIN3 (<= VCC) for linear TYPE3 COMPENSATION SHOWN C102 VCC COMP1 R102 VOUT1 R101 FB1 UGATE1 VOUT1 PHASE1 LGATE1 Q102 L100 COUT1 C101 OCSET1 BOOT1 COCSET1 CBOOT1 Q101 CIN1 VIN CVCC CVIN VCC VIN OPTIONAL CONNECTION (FOR VIN = VCC = 5V) ROCSET1 VIN1 = VIN R103 C103 C202 R100 COMP2 R202 VOUT2 R201 FB2 C201 ROCSET2 VIN2 = VIN R203 C203 R200 ISL6442 OCSET2 COCSET2 CBOOT2 Q201 UGATE2 CIN2 VOUT2 PHASE2 L200 BOOT2 TYPE3 COMPENSATION SHOWN VCC RPGOOD LGATE2 Q202 PGOOD RT R303 SS1/EN1 SS2/EN2 LCFB LCDR R302 C301 Q301 VIN3 COUT2 CIN3 VOUT3 R301 R300 COUT3 CSS1/EN1 CSS2/EN2 RRT SGND PGND FIGURE 2. TYPICAL APPLICATION 3 FN9204.1 April 7, 2006 ISL6442 Absolute Maximum Ratings (Note 1) SS1/EN1, SS2/EN2, COMP1, COMP2 to SGND . . . -0.3V to +6.0V VCC, FB1, FB2, RT, PGOOD to SGND . . . . . . . . . . . -0.3V to +6.0V LCDR, LCFB to SGND. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.0V VIN, OCSET1, and OCSET2 to PGND . . . . . . . . . . . . -0.3V to +28V BOOT1 and BOOT2 to PGND . . . . . . . . . . . . . . . . . . . -0.3V to +33V BOOT1 to PHASE1, and BOOT2 to PHASE2 . . . . . . -0.3V to +6.0V UGATE1 to PHASE1 . . . . . . . . . . . . . . . . . -0.3V to (BOOT1 +0.3V) UGATE2 to PHASE2 . . . . . . . . . . . . . . . . . -0.3V to (BOOT2 +0.3V) LGATE1, LGATE2 to PGND . . . . . . . . . . . . . . -0.3V to (VCC+0.3V) PHASE1, PHASE2 to PGND . . . . . . . . . . . . . . . . . . . . . . -1V to 28V SGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V Thermal Information Thermal Resistance (Typical, Note 2) θJA (°C/W) QSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Maximum Junction Temperature (Plastic Package). . -55°C to 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Recommended Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10% VIN Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V to 24V CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. All voltages are measured with respect to GND. 2. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 3. Guaranteed by design only; not production tested. 4. Design guideline only; not production tested Electrical Specifications PARAMETER VIN SUPPLY Input Operating Supply Current Operating Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 5V ±10%, TA = -40°C to +85°C. Typical values are at 25°C. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS ICC_op VIN = 5.5V or 12V; LGATEx, UGATEx Open, FB forced above regulation point (no switching) VIN = 24V - 4.5 7.5 mA - 50 1.25 70 2 mA mA Input Standby Supply Current VCC INTERNAL REGULATOR Output Voltage Maximum Output Current VCC Current Limit (Note 3) REFERENCE AND SOFT-START Reference Voltage at FB1, FB2 ICC_sb VIN = 5.5V, 12V, 24V; SS1/EN1 = SS2/EN2 = 0V VVCC IICC_max IICC_CL VIN > 5.5V VIN = 12V VCC is pulled to PGND; (Note 4) 4.5 80 - 5.2 300 5.5 - V mA mA VREF1, VREF2 VIN = 5V or 12V; TA = 25°C VIN = 5V or 12V; TA = 0°C to +85°C VIN = 5V or 12V; TA = -40°C to +85°C 0.5925 0.5900 0.5940 0.5915 20 0.8 0.6000 0.6015 30 1.0 50 0.6085 0.6085 0.6100 0.6100 40 1.2 - V V V V V V µA V mV Reference Voltage at FB1, FB2 VREF1, VREF2 VIN = 24V; TA = 25°C VIN = 24V; TA = 0°C to +85°C VIN = 24V; TA = -40°C to +85°C ENx/SSx Soft-Start Current ENx/SSx Enable Threshold ENx/SSxEnable Threshold Hysteresis ISSx VENx VENx_hys (Note 3) - 4 FN9204.1 April 7, 2006 ISL6442 Electrical Specifications PARAMETER ENx/SSx Soft-Start Top of Ramp Voltage POWER-ON RESET ON VCC Rising Threshold Falling Threshold PWM CONVERTERS Minimum UGATE on Time Maximum Duty Cycle Maximum Duty Cycle FBx Pin Bias Current OSCILLATOR Low End Frequency FSW VIN = 5V or 12V; RT = 52.3k VIN = 24V; RT = 52.3k High End Frequency FSW VIN = 5V; RT = 5.23k VIN = 12V; RT = 5.23k Frequency Adjustment Range FSW RT = 52.3k; (Note 3) RT = 5.23k; (Note 3) PWM Sawtooth Ramp Amplitude (peak-peak) VPP (Note 4) 270 270 2.25 2.25 300 305 2.5 2.55 0.3 2.5 1.25 330 340 2.75 2.85 kHz kHz MHz MHz MHz MHz V tUGATE_min (Note 3) DCmax DCmax IFBx VIN = 4.5 or 12V; FSW = 300kHz VIN = 4.5V; FSW = 2.5MHz (Note 3) 95 80 100 80 ns % % nA VPOR_r VPOR_f 4.2 3.85 4.4 4.0 4.475 4.1 V V Operating Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 5V ±10%, TA = -40°C to +85°C. Typical values are at 25°C. (Continued) SYMBOL VSSx_top (Note 3) TEST CONDITIO