L5994 ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER PRODUCT PREVIEW DUAL PWM BUCK CONTROLLERS ADJUSTABLE 1.9V to 5V (Section 1) 1.66V to 3.5V (Section 2) 12V/120mA LINEAR REGULATOR DUAL SYNCH RECTIFIERS DRIVERS 96% EFFICIENCY ACHIEVABLE 50µA (@ 12V) STAND BY CONSUMPTION 5.0V TO 25V SUPPLY VOLTAGE EXCELLENT LOAD TRANSIENT RESPONSE DISABLE PULSE SKIPPING FUNCTION OUTPUT UNDERVOLTAGE SHUTDOWN POWER MANAGEMENT: - UNDER AND OVERVOLTAGE OUTPUT DETECTION - POWER GOOD SIGNAL - SEPARATED DISABLE THERMAL SHUTDOWN PACKAGE: TQFP32 TQFP32 ORDERING NUMBER: L5994 APPLICATION NOTEBOOK AND SUBNOTEBOOK COMPUTERS PEN TOP AND PORTABLE EQUIPMENT COMMUNICATING COMPUTERS DESCRIPTION The L5994 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook computer and/or battery powered equipment. The device produces regulated 1.8V, 2.5V (both adjustable) and 12V supplies for use in portable and PCMCIA applications. The internal architecture allows to operate with minimum external components count. A very high switching frequency (200/300 KHz or externally synchronizable) optimizes their physical dimensions. Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a wide load current range. The two high performance PWM controllers for 1.8V and 2.5V lines are monitored for overvoltage, undervoltage and overcurrent conditions. On detection of a fault, a POWER GOOD signal is generated and a specific shutdown procedure takes place to prevent physical damage and data corruption. A disable function allows to manage the output power sections separately, optimising the quiescent consumption of the IC in stand-by conditions. SYSTEM BLOCK DIAGRAM 2.5V 5V to 25V L5994 SYNC POWER SECTION 1.8V 12V LDO 5.1V LDO POWER MANAGEMENT & SYSTEM SUPERVISOR µP MEMORY PERIPHERALS 3.39V REF POWER GOOD D98IN862 September 1999 This is preliminary information on a new product now in development. Details are subject to change without notice. 1/8 L5994 ABSOLUTE MAXIMUM RATINGS Symbol VIN VI IIN IOUT TJ Parameter Power Supply Voltage on V IN Maximum Pin Voltage to Pins 1, 24, 25, 32 Input Current Except V13IN and VIN Output Current Digital Output Junction Temperature Value 0 to 25 -0.5 to (VIN +5) -1 to +1 -15 to +15 -55 to 150 Unit V V mA mA °C Value 60 Unit °C/W THERMAL DATA Symbol R TH J-amb Parameter Thermal Resistance Junction -Ambient H2GATE H2SRC R2GATE PGND PREG5 R1GATE H1SRC H1GATE PIN CONNECTION (Top view) 32 31 30 29 28 27 26 25 H1STRAP 1 24 H2STRAP VIN 2 23 PWROK2 SREG5 3 22 REG12 V5SW 4 21 V13IN V1SNS 5 20 V2SNS I1SNS 6 19 I2SNS COMP1 7 18 COMP2 SOFT1 8 17 SOFT2 RUN2 OSC NOSKIP SGND VREF RUN1 CRST PWROK1 9 10 11 12 13 14 15 16 D98IN863A BLOCK DIAGRAM SOFT1 SOFT2 8 SLOPE 6 I1SNS V1SNS + ERROR SUMMING + 5 COMP1 I1SNS H1SRC R1GATE PREG5 V2SNS I2SNS OVER CURRENT COMPARATOR REG5 30 18 + + - - CONTROL LOGIC + - - PULSE SKIPPING COMPARATOR Lside VREF 24 Hside CONTROL LOGIC + - - 25 26 PREG5 PULSE SKIPPING COMPARATOR + Lside 27 LINEAR REGULATOR OVERVOLT COMPARATOR 21 12 + SWITCH COMPARATOR VREF BUFFER V5SW VREF 4.7V POWER MANAGEMENT & SYSTEM SUPERVISOR + - V13IN UNDERVOLT COMPARATOR - VREF 3 OSCILLATOR & SYNCHRONIZATION VREF 22 16 RUN2 2/8 10 14 RUN1 PWROK1 11 NOSKIP 9 15 OSC 23 CRST PWROK2 REG12 REG12 LDO SGND 13 R2GATE 13V 2 SREG5 H2SRC - + VIN H2GATE PGND 13V UV Comp + W5SW H2STRAP 28 29 4 V2SNS COMP2 ZERO CROSSING COMPARATOR + I2SNS - OVER CURRENT COMPARATOR ZERO CROSSING COMPARATOR Hside 31 20 + 1 32 19 - + VREF H1GATE V1SNS SLOPE + ∑ - H1STRAP + ERROR SUMMING SOFT ∑ - 7 17 SOFT D98IN864 L5994 PIN FUNCTIONS N. Name 1 H1STRAP Description Section 1 section bootstrap capacitor connection 2 VIN 3 SREG5 Signal 5V. It should be connected to PREG5 pin. 4 V1SW Alternative device supply voltage. 5 V1SNS This pin connects to the (-) input of the section 1 internal current sense comparator 6 I1SNS This pin connects to the (+) input of the section 1 internal current sense comparator 7 COMP1 Feedback input for the section 1. 8 SOFT1 Soft-start input of the section 1. The soft-start time is programmed by an external capacitor connected between this pin and SGND. Approximately, 1ms/nF @ full load. Input used for start-up and shut-down timing. A capacitor defines a time of 2ms/nF. Device supply voltage. From 5.0 to 25V 9 CRST 10 PWROK1 11 RUN1 Control input to enable/disable the section 1. A high level (>2.4V) enables this section, a low level (<0.8V) shuts it down 12 VREF Internal +2.5V high accuracy voltage generator. It can source 5mA to external load. Bypass to ground with a 4.7µF capacitor to reduce noise. 13 SGND Signal ground. Reference for internal logic circuitry. It must be routed separately from high current returns. 14 NOSKIP Pulse skipping mode control. A high level (>2.4V) disables pulse skipping at low load current, a low level (<0.8V) enables it. 15 OSC Oscillator frequency control: connect to 2.5V to select 300KHz operation, to ground or to 5V for 200KHz operation. A proper external signal can synchronize the oscillator 16 RUN2 Control input to enable/disable the section 2. A high level (>2.4V) enables this section, a low level (>0.8V) shuts it down. 17 SOFT2 Soft-start input for the section 2. The soft-start time is programmed by an external capacitor connected between this pin and GND. Approximately, 1ms/nF @full load. 18 COMP2 Feedback input for the section 2. 19 I2SNS This pin connects to the (+) input of the section 2 internal current sense comparator 20 V2SNS This pin connects to the (-) input of the section 2 internal current sense comparator 21 V13IN 12V regulator input supply voltage, included between 13 and 20V. This voltage can be supplied by a flyback winding. 22 REG12 12V regulator output voltage. It can source up to 150mA to an external load 23 PWROK2 Power good diagnostic signal. This output is driven high when section 2 is enabled and running properly, after a delay defined by CRST capacitor 24 H2STRAP Section 2 bootstrap capacitor connection 25 H2GATE Gate- driver output for the section 2 high-side N-MOS 26 H2SRC Section 2 high-side N-MOS source connection 27 R2GATE Gate- driver output for the section 2 low- side N-MOS (synchronous rectifier). 28 PGND Current return for drivers 29 PREG5 +5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground. 30 R1GATE Gate-driver output for the section 1 low-side N-MOS (synchronous rectifier). 31 H1SRC Section 1 high-side N-MOS source connection 32 H1GATE Gate-driver output for the section 1 high-side N-MOS Power-good diagnostic signal. This output is driven high when section 1 is enabled and running properly, after a delay defined by the CRST capacitor. 3/8 L5994 ELECTRICAL CHARACTERISTICS (VIN = 12V; TJ = 25°C; VOSC = GND; unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit DC CHARACTERISTICS VIN Input Supply Voltage 5.0 I2 Operating Quiescent Current R1GATE = R2GATE = OPEN H1GATE = H2GATE = OPEN RUN2 = RUN1 = SREG5 (DRIVERS OFF) I2 Stand-By Current RUN2= RUN1 = GND VIN = 12V VIN = 20V 25 V 1.35 mA 50 60 100 120 µA 1.9 1.957 V SECTION 1 PWM CONTROLLER V1OUT (*) V1SNS Feedback Voltage VIN = 5.0 to 20V; VI1SNS - VV1SNS = 0 to 40mV 1.843 V6 - V 5 Over-Current Threshold Voltage VSOFT1 = 4V 50 mV V6 - V5 Pulse Skipping Mode Thereshold Voltage VIN > 6.8V 13 mV V5 VIN < 5.8V 6.5 mV Over Voltage Threshold ON V1SNS 1.99 2.052 2.11 V Under Voltage Threshold ON V1SNS 1.695 1.748 1.80 V 1.610 1.66 1.709 V SECTION 2 PWM CONTROLLER V2OUT (*) V2SNS Feedback Voltage VIN = 5.0 to 20V; VI2SNS - VV2SNS = 0 to 40mV V19 - V20 Over Current Threshold Voltage VSOFT2 = 4V 50 mV V19 - V20 Pulse Skipping Mode Threshold Voltage VIN = 5.0 to 20V; 13 mV V 20 Over Voltage Threshold ON V2SNS 1.738 1.792 1.845 V Under Voltage Threshold ON V2SNS 1.48 1.527 1.572 V PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS) FOSC Switching Frequency Accuracy 255 300 345 kHz 170 200 230 kHz 2.6 V 450 ns V 15 Voltage Range for 300kHz Operation 2.4 TOFF Dead Time 300 TOV Overvoltage Propagation Time V1SNS to PWROK or V2SNS to PWROK 1.25 µs TUV Undervoltage Propagation Time V1SNS to PWROK or V2SNS to PWROK 1.5 µs V5, V20 Output UVLO Threshold Respect output voltage I8, I17 Soft Start Charge Current 4.8 V8, V17 Soft Start Clamp Voltage µA V (*) Guaranteed by design, not tested in production 4/8 OSC = SREG5/2 OSC = 0 or SREG5 375 70 3.2 4 4 % L5994 ELECTRICAL CHARACTERISTICS (Continued) Symbol Parameter Test Condition Min. Typ. CLOAD = 1nF 0.2 0.5 0.2 0.5 Max. Unit HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS) I25, I27, I32, I30 Source Output Peak Current Sink Output Peak Current C LOAD = 1nF RH RDSON Resistance (or Impedance) Driver OUT HIGH RL RDSON resistance (or Impedance) Driver OUT LOW VOH Output High Voltage HSTRAP = PREG5 ISOURCE = 10mA; HSRC = GND V OL Output Low Voltage HSTRAP = PREG5 ISINK = 10mA HSRC = GND TCC Cross-Conduction Delay 4.40 30 5.3 75 A A 7 Ω 5 Ω 5.61 V 0.5 V 130 ns 20 V 12V LINEAR REGULATOR SECTION V 21 Input Voltage Range V 22 Output Voltage I22 = 0 to 120mA I22 Current Limiting VREG12 = 12V 120 mA Short Circuit Current VREG12 = 0V 150 mA Input Voltage Clamp ICLAMP = 100µA ”One Shot” Activation Threshold V13IN Falling VCP 13 11.54 12.0 12.48 16 12.88 V V 13.7 ”One Shot” Pulse 14.52 V 1.5 µs 5.61 V INTERNAL REGULATOR (VPREG5) AND REFERENCE VOLTAGE V 29 VREG5 Output Voltage VIN = 5.0 to 20V ILOAD = 0 to 5mA 5.0 I29 Total Current Capability VPREG5 = 5.3V VREG5 = 6V 25 70 Switch-Over Threshold Voltage V 12 4.3 Reference Voltage VIN = 5.0 to 20V ILOAD = 1 to 5mA I12 Source Current at Reference Voltage 5.3 mA 4.53 4.7 V 2.5 V 2.5 V 5 mA POWER GOOD AND ENABLE FUNCTION V16, V11 RUN2, RUN1, Enable Voltage HIGH LEVEL V16, V11 RUN2, RUN1, Disable Voltage LOW LEVEL Power Good Delay C CRST = 100nF 160 Shutdown Delay Time before Low Side Activation (Except Over-Voltage Fault) C CRST = 100nF, 160 Power Good High Level IPWROK = 40µA 4.1 Power Good LowLevel IPWROK = 320µA T10 T27, T30 2.4 CRST Timing Rate V 0.8 V 200 240 ms 200 240 ms 2 ms/nF V 0.4 V SYNCHRONIZATION Synchronisation Pulse Width 400 ns Synchronisation Input Voltage (Falling Edge Transition) 5 V 5/8 6/8 NOSKIP PWROK1 GND +5VIN GND VOUT1 GND VIN R19 R6 R5 C18 R34 C9 C10 C11 C26 PIN21 C6 R33 C1 R14 R15 C20 R1 R2 C28 C2 S2 R13 S1 R12 D1 L1/T1 D6 R17 C7 S3 R11 PIN29 G1 S4 R10 G2 Q2 C16 Q1 D3 RUN1 NOSKIP RUN2 OSC PWROK1 COMP1 V5SW V1SNS I1SNS PREG5 R1GATE H1SRC H1GATE H1STRAP SGND 18 7 22 8 17 9 12 10 15 16 14 11 23 20 19 28 27 26 25 24 VREF CRST SOFT2 SOFT1 REG12 PWROK2 COMP2 V2SNS V13IN I2SNS PGND R2GATE H2SRC H2GATE H2STRAP SREG5 4 3 21 13 L5994 VIN 5 6 29 30 31 32 1 2 R16 C21 Q4 C17 Q3 D4 R9 C23 PIN29 L2/T2 D5 D2 R18 C8 C22 C29 C3 R3 R4 C24 C19 C4 R8 R7 D98IN866A C27 C13 C14 C15 C25 R20 GND VOUT3 12V PWROK2 GND VOUT2 L5994 APPLICATION CIRCUIT L5994 mm DIM. MIN. inch TYP. MAX. A MIN. TYP. 1.60 A1 0.05 A2 1.35 B 0.30 C 0.09 0.063 0.15 0.002 0.006 1.40 1.45 0.053 0.055 0.057 0.37 0.45 0.012 0.015 0.018 0.20 0.004 0.008 D 9.00 0.354 D1 7.00 0.276 D3 5.60 0.220 e 0.80 0.031 E 9.00 0.354 E1 7.00 0.276 E3 5.60 0.220 L 0.45 0.60 L1 0.75 OUTLINE AND MECHANICAL DATA MAX. 0.018 0.024 1.00 0.030 0.039 TQFP32 0°(min.), 7°(max.) K D A D1 A2 D3 24 A1 17 25 16 0.10 mm .004 B E E1 B E3 Seatin g Plane 9 32 8 1 C L L1 e K TQFP32 7/8 L5994 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 8/8