5mA CAPLESS PRELIMINARY - July 6, 1999 TM CHARGE PUMP SC1460 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1460 is a versatile charge pump designed for use in battery operated power supply applications requiring up to 5mA. It enables a simple low current boost circuit to be implemented without the costly inductors or capacitors associated with regular switching circuits. Features include internal MOSFETs, control circuitry and charge pump capacitor, requiring only two external capacitors for a total solution. With a very high operating frequency (8MHz free running at 2.5V in typically), the SC1460 does not require large input or output capacitors, and therefore uses very little board space. Two versions of the SC1460 are available: the -3.3 produces a regulated 3.3V output from 2.5V in, and the -5.0 produces a regulated 5V output from 3.3V in. It is supplied in the popular 3 lead, SOT-23 package. FEATURES • Small size - SOT-23 package • 4% voltage accuracy • Typical 100uA quiescent current APPLICATIONS • Handheld Power Supplies • PDA Power Supplies • Notebook Power Supplies • Peripheral Card Supplies • Industrial Power Supplies • High Density DC/DC Conversion ORDERING INFORMATION BLOCK DIAGRAM (1)(2) DEVICE PACKAGE SC1460CSK-X.X SOT-23 Notes: (1) Where X.X denotes voltage options. Available voltages are: 3.3V and 5.0V. (2) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMUM RATINGS Parameter PIN CONFIGURATION (Top View) Symbol Maximum Units Supply Voltage VIN -0.3 to + 4 V Output Voltage VO -0.3 to +6.0 V Thermal Resistance Junction to Ambient θJA 410 °C/W Operating Temperature TA 0 to +70 °C Temperature Range TJ 0 to 125 °C Storage Temperature TSTG -65 to +150 °C TL 300 °C Lead Temperature (Soldering) 10 seconds 3 Lead SOT-23 1 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 5mA CAPLESS TM CHARGE PUMP SC1460 PRELIMINARY - July 6, 1999 ELECTRICAL CHARACTERISTICS Unless specified: VIN = 3.3V (-5.0 parts), VIN = 2.5V (-3.3 parts), 0 ≤ IO ≤ 4mA, CIN = 0.22uF, COUT = 47nF, TA = 25°C. Values in bold apply over full operating temperature range Parameter Symbol Conditions MIN TYP MAX Units 3.63 V 100 150 µA Input Supply Voltage VIN 2.25 Input Supply Current IIN IO = 0mA VIN = 2.5 V Output Voltage VO SC1460CSK - 3.3, VIN = 2.5V -4 1.32 x VIN 4 % SC1460CSK - 5.0, VIN = 3.3V 4 1.515 X VIN 4 % IO = 4mA, COUT = 47nF 50 mV 4 5 mA 50 56 % SC1460CSK - 3.3, VIN = 2.5V 8 MHz SC1460CSK - 5.0, VIN = 3.3V 8.75 Power Up with IO = 4mA 100 Output Ripple (pk-pk) VR Output Current IO Efficiency η IO = 4mA OSC Oscillator Frequency Time to Regulation at Turn-On tON µs APPLICATION CIRCUIT 2 VIN U1 SC1460 VIN 1 VO VO GND Cin 0.22uF 3 Cout 47nF 2 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 5mA CAPLESS TM CHARGE PUMP SC1460 PRELIMINARY - July 6, 1999 Typical Eff. vs. Vo @25 Deg. C. Typical Vo vs. Io @25 Deg. C. 60 5 55 4 Vo (V) Efficiency (%) 4.5 50 3.5 3 Io = 4 mA Vin = 3.60V Vin = 3.30V Vin = 2.50V Vin = 2.25V Io = 5 mA 2.5 Io = 6 mA 45 2.5 3 3.5 4 4.5 2 5 0 Vo (V) Typical Eff. vs. Vin @25 Deg. C. 1 2 3 Io (mA) 4 5 6 Typical Iin vs. Vin @25 Deg. C. 16 60 14 Iin (mA) Efficiency (%) 12 55 50 10 8 6 4 Io = 4mA Io = 5mA Io = 6 mA Io = 5 mA Io = 4 mA Io = 0 mA 2 Io = 6mA 45 0 2 2.5 3 3.5 2 4 2.5 3 3.5 Vin (V) Vin (V) Typical Iin vs. Io @25 Deg. C. Typical Eff. vs. Io @25 Deg. C. 16 4 60 14 Efficiency (%) Iin (mA) 12 10 8 6 4 Vin = 3.60V Vin = 3.30V Vin = 2.50V Vin = 2.25V 2 0 0 1 2 3 Io (mA) 4 5 55 50 Vin = 2.25V Vin = 2.50V Vin = 3.30V Vin = 3.60V 45 6 4 4.5 5 Io (mA) 5.5 6 3 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 5mA CAPLESS TM CHARGE PUMP SC1460 PRELIMINARY - July 6, 1999 Typical Vo vs. Vin @25 Deg. C. 5 4.5 Vo (V) 4 3.5 3 Io = 0 mA Io = 4 mA Io = 5 mA Io = 6 mA 2.5 2 2 2.5 3 3.5 4 Vin (V) 4 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 5mA CAPLESS TM CHARGE PUMP SC1460 PRELIMINARY - July 6, 1999 Typical Eff. vs. Ta @ Io = 4 mA Typical Vo ripple vs. Cout @ Vin = 2.50V 70.0E-3 57 60.0E-3 Iout = 4mA 56 Vo ripple (V) Efficiency (%) 50.0E-3 55 54 40.0E-3 30.0E-3 20.0E-3 Vin = 2.25 V Vin = 2.50 V Vin = 3.30 V Vin = 3.60 V 10.0E-3 53 0 10 20 30 40 50 60 70 80 000.0E+0 22.0E-9 Ta (Deg. C.) 47.0E-9 56.0E-9 68.0E-9 82.0E-9 180.0E-9 220.0E-9 Cout (F) Typical Vo vs. Ta @ Vin = 2.50V Vo ripple 3.5 3.4 3.3 3.2 Vo (V) 3.1 3 2.9 2.8 Io = 0mA Io = 4mA Io = 5mA Io = 6mA 2.7 2.6 2.5 0 10 20 30 40 50 60 70 Ta (Deg. C.) Typical Iin vs. Ta @ Io = 0 mA 0.19 0.17 Iin (mA) 0.15 0.13 0.11 0.09 Vin = 2.25 V Vin = 2.50 V Vin = 3.30 V Vin = 3.60 V 0.07 0.05 0 10 20 30 40 50 60 70 Ta (Deg. C.) 5 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 5mA CAPLESS TM CHARGE PUMP SC1460 PRELIMINARY - July 6, 1999 OUTLINE DRAWING SOT-23-3L 6 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320