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(R)
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 50A (@ 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 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 SYSTEM BLOCK DIAGRAM
TQFP32 ORDERING NUMBER: L5994
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.
2.5V 5V to 25V
L5994
POWER SECTION
1.8V
SYNC
12V LDO 5.1V LDO POWER MANAGEMENT & SYSTEM SUPERVISOR 3.39V REF POWER GOOD
P MEMORY PERIPHERALS
D98IN862
September 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
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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
THERMAL DATA
Symbol R TH J-amb Parameter Thermal Resistance Junction -Ambient Value 60 Unit C/W
PIN CONNECTION (Top view)
H1GATE R1GATE R2GATE H2GATE 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 PWROK1 SGND VREF OSC CRST RUN1 NOSKIP RUN2 PREG5 H1SRC H2SRC PGND
32 31 30 29 28 27 26 25 H1STRAP VIN SREG5 V5SW V1SNS I1SNS COMP1 SOFT1 1 2 3 4 5 6 7 8 H2STRAP PWROK2 REG12 V13IN V2SNS I2SNS COMP2 SOFT2
D98IN863A
BLOCK DIAGRAM
SOFT1 8 SLOPE 6 I1SNS V1SNS COMP1 5 7 + + + VREF H1STRAP 1 OVER CURRENT COMPARATOR + H1GATE 32 Hside CONTROL LOGIC ZERO CROSSING COMPARATOR + PULSE SKIPPING COMPARATOR + PREG5 OVER CURRENT COMPARATOR + ZERO CROSSING COMPARATOR + PULSE SKIPPING COMPARATOR + 13V UV Comp + 4 W5SW VIN 2 OVERVOLT COMPARATOR SREG5 3 + SWITCH COMPARATOR VREF BUFFER + SGND 13 16 RUN2 11 10 14 NOSKIP 9 23
D98IN864
SOFT2 17 SOFT ERROR SUMMING + SLOPE 19 20 18 I2SNS V2SNS COMP2
ERROR SUMMING
SOFT
I1SNS V1SNS V2SNS I2SNS
+ + VREF
24
H2STRAP
Hside CONTROL LOGIC
25
H2GATE
H1SRC
31 REG5 30
26 PREG5 27 28
H2SRC
R1GATE
Lside
Lside
R2GATE PGND
29 LINEAR REGULATOR UNDERVOLT COMPARATOR
21 V13IN
13V
4.7V
VREF
12
POWER MANAGEMENT & SYSTEM SUPERVISOR OSCILLATOR & SYNCHRONIZATION
VREF
RUN1 PWROK1
CRST PWROK2
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-
VREF
+
V5SW
22 REG12 LDO 15
REG12
OSC
L5994
PIN FUNCTIONS
N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Name H1STRAP VIN SREG5 V1SW V1SNS I1SNS COMP1 SOFT1 CRST PWROK1 RUN1 VREF SGND NOSKIP OSC RUN2 SOFT2 COMP2 I2SNS V2SNS V13IN REG12 PWROK2 H2STRAP H2GATE H2SRC R2GATE PGND PREG5 R1GATE H1SRC H1GATE Description Section 1 section bootstrap capacitor connection Device supply voltage. From 5.0 to 25V Signal 5V. It should be connected to PREG5 pin. Alternative device supply voltage. This pin connects to the (-) input of the section 1 internal current sense comparator This pin connects to the (+) input of the section 1 internal current sense comparator Feedback input for the section 1. 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. 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. Control input to enable/disable the section 1. A high level (>2.4V) enables this section, a low level (<0.8V) shuts it down Internal +2.5V high accuracy voltage generator. It can source 5mA to external load. Bypass to ground with a 4.7F capacitor to reduce noise. Signal ground. Reference for internal logic circuitry. It must be routed separately from high current returns. Pulse skipping mode control. A high level (>2.4V) disables pulse skipping at low load current, a low level (<0.8V) enables it. 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 Control input to enable/disable the section 2. A high level (>2.4V) enables this section, a low level (>0.8V) shuts it down. 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. Feedback input for the section 2. This pin connects to the (+) input of the section 2 internal current sense comparator This pin connects to the (-) input of the section 2 internal current sense comparator 12V regulator input supply voltage, included between 13 and 20V. This voltage can be supplied by a flyback winding. 12V regulator output voltage. It can source up to 150mA to an external load Power good diagnostic signal. This output is driven high when section 2 is enabled and running properly, after a delay defined by CRST capacitor Section 2 bootstrap capacitor connection Gate- driver output for the section 2 high-side N-MOS Section 2 high-side N-MOS source connection Gate- driver output for the section 2 low- side N-MOS (synchronous rectifier). Current return for drivers +5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground. Gate-driver output for the section 1 low-side N-MOS (synchronous rectifier). Section 1 high-side N-MOS source connection Gate-driver output for the section 1 high-side N-MOS
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L5994
ELECTRICAL CHARACTERISTICS (VIN = 12V; TJ = 25C; VOSC = GND; unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
DC CHARACTERISTICS
VIN I2 Input Supply Voltage Operating Quiescent Current R1GATE = R2GATE = OPEN H1GATE = H2GATE = OPEN RUN2 = RUN1 = SREG5 (DRIVERS OFF) RUN2= RUN1 = GND VIN = 12V VIN = 20V 50 60 5.0 25 1.35 V mA
I2
Stand-By Current
100 120
A
SECTION 1 PWM CONTROLLER
V1OUT (*) V6 - V 5 V6 - V5 V5 V1SNS Feedback Voltage Over-Current Threshold Voltage Pulse Skipping Mode Thereshold Voltage Over Voltage Threshold ON V1SNS Under Voltage Threshold ON V1SNS VIN = 5.0 to 20V; VI1SNS - VV1SNS = 0 to 40mV VSOFT1 = 4V VIN > 6.8V VIN < 5.8V 1.99 1.695 1.843 1.9 50 13 6.5 2.052 1.748 2.11 1.80 1.957 V mV mV mV V V
SECTION 2 PWM CONTROLLER
V2OUT (*) V19 - V20 V19 - V20 V 20 V2SNS Feedback Voltage Over Current Threshold Voltage Pulse Skipping Mode Threshold Voltage Over Voltage Threshold ON V2SNS Under Voltage Threshold ON V2SNS VIN = 5.0 to 20V; VI2SNS - VV2SNS = 0 to 40mV VSOFT2 = 4V VIN = 5.0 to 20V; 1.738 1.48 1.610 1.66 50 13 1.792 1.527 1.845 1.572 1.709 V mV mV V V
PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS)
FOSC V 15 TOFF TOV TUV V5, V20 I8, I17 V8, V17 Switching Frequency Accuracy Voltage Range for 300kHz Operation Dead Time Overvoltage Propagation Time Undervoltage Propagation Time Output UVLO Threshold Soft Start Charge Current Soft Start Clamp Voltage V1SNS to PWROK or V2SNS to PWROK V1SNS to PWROK or V2SNS to PWROK Respect output voltage 3.2 70 4 4 4.8 OSC = SREG5/2 OSC = 0 or SREG5 255 170 2.4 300 375 300 200 345 230 2.6 450 1.25 1.5 kHz kHz V ns s s % A V
(*) Guaranteed by design, not tested in production
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L5994
ELECTRICAL CHARACTERISTICS (Continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS)
I25, I27, I32, I30 RH RL VOH V OL TCC Source Output Peak Current Sink Output Peak Current RDSON Resistance (or Impedance) RDSON resistance (or Impedance) Output High Voltage Output Low Voltage Cross-Conduction Delay CLOAD = 1nF C LOAD = 1nF Driver OUT HIGH Driver OUT LOW HSTRAP = PREG5 ISOURCE = 10mA; HSRC = GND HSTRAP = PREG5 ISINK = 10mA HSRC = GND 30 75 4.40 5.3 0.2 0.2 0.5 0.5 7 5 5.61 0.5 130 A A V V ns
12V LINEAR REGULATOR SECTION
V 21 V 22 I22 VCP Input Voltage Range Output Voltage Current Limiting Short Circuit Current Input Voltage Clamp "One Shot" Activation Threshold "One Shot" Pulse I22 = 0 to 120mA VREG12 = 12V VREG12 = 0V ICLAMP = 100A V13IN Falling 13 11.54 120 150 16 12.88 13.7 14.52 1.5 12.0 20 12.48 V V mA mA V V s
INTERNAL REGULATOR (VPREG5) AND REFERENCE VOLTAGE
V 29 I29 VREG5 Output Voltage Total Current Capability Switch-Over Threshold Voltage V 12 Reference Voltage VIN = 5.0 to 20V ILOAD = 1 to 5mA I12 Source Current at Reference Voltage 5 VIN = 5.0 to 20V ILOAD = 0 to 5mA VPREG5 = 5.3V VREG5 = 6V 5.0 25 70 4.3 4.53 2.5 2.5 4.7 5.3 5.61 V mA V V V mA
POWER GOOD AND ENABLE FUNCTION
V16, V11 V16, V11 T10 T27, T30 RUN2, RUN1, Enable Voltage RUN2, RUN1, Disable Voltage Power Good Delay Shutdown Delay Time before Low Side Activation (Except Over-Voltage Fault) CRST Timing Rate Power Good High Level Power Good LowLevel SYNCHRONIZATION Synchronisation Pulse Width Synchronisation Input Voltage (Falling Edge Transition) 400 5 ns V IPWROK = 40A IPWROK = 320A 4.1 0.4 HIGH LEVEL LOW LEVEL CCRST = 100nF CCRST = 100nF, 160 160 200 200 2.4 0.8 240 240 V V ms ms
2
ms/nF V V
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R16 C2 D3 H1STRAP R17 Q1 H1GATE 32 25 D5 C17 VOUT2 L2/T2 Q2 30 27 G1 PREG5 29 6 5 4 7 18 COMP2 PIN29 PWROK2 REG12 SOFT1 8 17 9 12 13 SGND SOFT2 CRST VREF C21 C23 C22 C24 C27 R9 PWROK2 VOUT3 12V GND C19 R8 20 V2SNS 21 V13IN 19 I2SNS R7 28 PGND G2 I1SNS V1SNS V5SW COMP1 PIN29 C20 23 10 15 16 14 11 22 R1GATE R2GATE D2 GND Q4 R3 R4 C13 C14 C15 H2GATE D6 C16 H1SRC 31 26 H2SRC R1 R2 D1 L1/T1 Q3 R18 C29 1 24 H2STRAP 2 3 D4 VIN C7 SREG5 C8 C3 C4 C28 C25 R20
L5994
VIN
R33
APPLICATION CIRCUIT
GND
C6
C1
PIN21
C26
VOUT1
R19
C9 C10 C11
L5994
GND
R5
R34
+5VIN
GND
R6
C18
PWROK1 OSC RUN2 NOSKIP RUN1
R15
R13 PWROK1
R12
R11
R10
NOSKIP
R14
S2
S1
S3
S4
D98IN866A
L5994
mm MIN. A A1 A2 B C D D1 D3 e E E1 E3 L L1 K 0.45 0.05 1.35 0.30 0.09 9.00 7.00 5.60 0.80 9.00 7.00 5.60 0.60 1.00 0(min.), 7(max.) 0.75 0.018 1.40 0.37 TYP. MAX. 1.60 0.15 1.45 0.45 0.20 0.002 0.053 0.012 0.004 0.354 0.276 0.220 0.031 0.354 0.276 0.220 0.024 0.039 0.030 0.055 0.015 MIN. inch TYP. MAX. 0.063 0.006 0.057 0.018 0.008
DIM.
OUTLINE AND MECHANICAL DATA
TQFP32
D D1 D3 A1
17 16
0.10 mm .004 Seatin g Plane
A A2
24 25
E3
E1
B
E
32 1 8
9
B
e
L1 L
C
K
TQFP32
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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 (c) 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
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