DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET PRELIMINARY - August 7, 2000 SC1452 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com FEATURES •= Up to 150mA per regulator output •= Low quiescent current •= Low dropout voltage •= Wide selection of output voltages •= Stable operation with ceramic caps •= Tight load and line regulation •= Current and thermal limiting •= Reverse input polarity protection •= <1uA off-mode current •= Logic controlled electronic enable •= Programmable reset •= Full industrial temperature range DESCRIPTION The SC1452 is a state of the art device intended to provide maximum performance and flexibility in battery operated systems. It has been designed specifically to fully support a single Li-Ion battery and its external charger voltages. The SC1452 contains two independently enabled, ultra low dropout voltage regulators (ULDOs). It operates from an input voltage range of 2.5V to 6.5V, and a wide variety of output voltage options are available which are designed to provide an initial tolerance of ±1% and ±2% over temperature. Each regulator has an associated active-low reset signal which is asserted when the voltage output declines below the preset threshold. Once the output recovers, the reset continues to be asserted (delayed) for a predetermined time, 50ms for reset A and 150ms for reset B. In the case of regulator B, the delay time may be reduced by the addition of an external capacitor. APPLICATIONS •= Cellular telephones •= Palmtop/Laptop computers •= Battery-powered equipment •= Bar code scanners •= SMPS post regulator/dc to dc modules •= High efficiency linear power supplies The SC1452 has a bypass pin to enable the user to capacitively decouple the bandgap reference for very low output noise (down to 50µVrms). ORDERING INFORMATION Part Numbers The devices utilize CMOS technology to achieve very low operating currents (typically 150µA with both outputs supplying 150mA). The dropout voltage is typically 165mV at 150mA, helping to prolong battery life. In addition, the devices are guaranteed to provide 400mA of peak current for applications which require high initial inrush current. They have been designed to be used with low ESR ceramic capacitors to save cost and PCB area. SC1452XIMSTR Package (1)(2) MSOP-10 Notes: (1) Where X denotes voltage options - see table on page 5. (2) Only available in tape and reel packaging. A reel contains 2500 devices. The SC1452 comes in the low profile 10-lead MSOP package. TYPICAL APPLICATION U1 1 3.3V OUT 2 2.5V OUT 3 4 RESET A 5 RESET B OUTA OUTB IN ENA GND BYP RSTA ENB RSTB DLYB 10 3.3V IN 9 ENABLE OUTPUT A 8 7 ENABLE OUTPUT B 6 SC1452JIMS COUTA 1uF COUTB 1uF CBYP 10nF CDLYB 10nF CIN 1uF 1 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Maximum Units Input Supply Voltage VIN -5 to +7 V Enable Input Voltage VEN -5 to +VIN V Operating Ambient Temperature Range TA -40 to +85 °C Operating Junction Temperature Range TJ -40 to +125 °C TSTG -60 to +150 °C Thermal Resistance Junction to Ambient θJA 113 °C/W Thermal Resistance Junction to Case θJC 42 °C/W ESD 2 kV Storage Temperature ESD Rating (Human Body Model) ELECTRICAL CHARACTERISTICS Unless specified: TA = 25°C, VIN = VOUT + 1V, IOUTA = IOUTB = 1mA, COUT = 1.0 µF, VENA = VENB = VIN. Values in bold apply over full operating temperature range. Parameter Symbol Condition Min Typ Max Units 6.5 V 150 µA IN Input Supply Voltage VIN Quiescent Current IQ 2.5 VENA = 0V, VENB = VIN, IOUTB = 150mA or 90 VENB = 0V, VENA = VIN, IOUTA = 150mA 200 VENA = VENB = VIN, IOUTA = IOUTB = 150mA 150 240 µA 300 VENA = VENB = 0V (OFF) 0.5 1 µA 2 OUTA, OUTB Output Voltage Line Regulation VOUT REG(LINE) IOUT = 1mA -1% 0mA ≤ IOUT =≤ 150mA, VOUT +1V ≤=VIN ≤=5.5V -2% VOUT + 1V ≤ VIN ≤ 5.5V, IOUT = 1mA VOUT +1% V +2% 5 10 mV 12 Load Regulation REG(LOAD) 0.1mA ≤=IOUT ≤=150mA -5 -15 mV -30 Dropout Voltage VD IOUT = 1mA 1.1 IOUT = 50mA 55 mV 75 mV 120 IOUT =150mA 165 250 mV 300 Current Limit ILIM 400 mA 2 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 ELECTRICAL CHARACTERISTICS (Cont.) Unless specified: TA = 25°C, VIN = VOUT + 1V, IOUTA = IOUTB = 1mA, COUT = 1.0 µF, VENA = VENB = VIN. Values in bold apply over full operating temperature range. Parameter Symbol Condition Min Typ Max Units PSRR f = 120Hz, CBYP = 10nF 60 dB en f = 10Hz to 99kHz, IOUT = 50mA, CBYP = 10nF, COUT = 2.2µF 50 µVRMS tr CBYP = 10nF 1.5 ms OUTA, OUTB (Cont.) Ripple Rejection Output Voltage Noise BYP Start-up Rise Time ENABLE (ENA, ENB) Enable Input Threshold VIH Enable Input Current V 1.6 VIL 0.4 IEN 0.2 µA %VOUT RSTA, RSTB Reset Threshold VTH Reset A Delay VOUT falling 88 90 92 VOUT rising 90 92 94 30 50 70 ms 150 210 ms tRSTA Reset B Delay (1) Reset A, B Output Voltage tRSTB VDLYB = 0V 90 VOH ISOURCE = 0.5mA 80 VOL ISINK = 1.2mA %VOUT 0.3 V DLYB Delay Voltage Threshold VDLYB Delay Source Current IDLYB VOUTB < VTH 1.225 1.250 1.275 V 3.0 µA 2.1 3.9 OVER TEMPERATURE PROTECTION High Trip Level Hysteresis THI 150 °C THYST 20 °C NOTE: (1) VOHA will be a percentage of VOUTA, and VOHB will be a percentage of VOUTB. 3 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 BLOCK DIAGRAM 4 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 PIN CONFIGURATION (Top View) MSOP-10 MARKING INFORMATION VOLTAGE OPTIONS Replace X in the part number (SC1452XIMS) by the letter shown below for the corresponding voltage option: X VOUTA (V) VOUTB (V) A 1.8 1.8 B 2.5 2.5 C 2.8 2.8 D 3.0 3.0 E 3.3 3.3 F 3.0 2.5 G 3.0 1.8 H 3.0 2.8 J 3.3 2.5 K 3.3 2.8 # = Voltage options (Example: 452F) yyww = Datecode (Example: 0008) XXXX = Lot Number (Example: E01102) PIN DESCRIPTIONS Pin # Pin Name Pin Function 1 OUTA Regulator A output. 2 OUTB Regulator B output. 3 GND Ground pin. 4 RSTA Power on reset for regulator A. Active low when OUTA is below the reset threshold. 5 RSTB Power on reset for regulator B. Active low when OUTB is below the reset threshold. 6 DLYB Programmable delay for RESETB. Delay time can be set by connecting a capacitor, CDLYB, between this pin and ground. Ground this pin if using the default delay time. 7 ENB Active high enable pin for output B. CMOS compatible input. Connect to IN if not being used. 8 BYP Bypass pin for bandgap reference. Connect a 10nF capacitor, CBYP, between this pin and ground for low noise operation. 9 ENA Active high enable pin for output A. CMOS compatible input. Connect to IN if not being used. 10 IN Input pin for both regulators. 5 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 APPLICATIONS INFORMATION voltage is reached. The delay time can be calculated by rearranging the above equation, solving for t: Adjusting RSTB Delay Time t RSTB = RSTB, the power on reset for regulator B, can be reduced externally by connecting a capacitor to the delay time set pin DLYB. If DLYB is connected to ground, the internally controlled delay time of 150ms (typ.) will apply. Referring to the block diagram, as the output of regulator B (VOUTB) rises and reaches the reset threshold voltage (92% VOUTB(NOM)), two things happen: 1) the internal 150ms timer starts; 2) the 3µA current source turns on, charging CDLYB (if connected). C DLYB • 1 .25 = 416 ,667 • C DLYB 3 • 10 − 6 Note that the maximum delay time is 150ms, as RSTB goes high when either the internal timer or externally set timer times out, so if tRSTB is set externally for 200ms, the reset delay will still be 150ms. Thus for a 150ms delay, DLYB should be grounded, and for a delay time less than 150ms, CDLYB can be calculated using the equation above, or read from the chart below. 1000 tRSTB = 150ms max. VDLYB = 3 • 10 −6 • t C DLYB tRSTB (ms) 100 If DLYB is connected to ground, RSTB goes high 150ms after VOUTB crosses the threshold voltage. If a capacitor is connected between DLYB and ground, the voltage at DLYB can be described by the following equation: 10 1 0.1 0.01 An internal comparator compares this voltage to a 1.25V reference, and triggers the reset high once this 0.1 1 10 100 1000 CDLYB (nF) 6 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET SC1452 PRELIMINARY - August 7, 2000 DEVICE OUTLINE - MSOP-10 LAND PATTERN - MSOP- 10 - DRAWING PENDING ECN 00-1247 7 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320