LTC1550L/LTC1551L Low Noise, Switched Capacitor Regulated Voltage Inverters FEATURES DESCRIPTIO n The LTC 1550L/LTC1551L are switched capacitor charge Regulated Negative Voltage from a Single pump voltage inverters which include internal linear post- Positive Supply n regulators to minimize output ripple. The LTC1550L fixed Low Output Ripple: Less Than 1mV Typ P-P n output voltage versions include 4.1V, 2.5V and 2V with High Charge Pump Frequency: 900kHz n ripple voltages typically below 1mV . The LTC1550L is Small Charge Pump Capacitors: 0.1m F P-P n also available in an adjustable output voltage version. The Requires Only Four External Capacitors n LTC1550L/LTC1551L are ideal for use as bias voltage Fixed 4.1V, 2.5V, 2V or Adjustable Output n generators for GaAs transmitter FETs in portable RF and Shutdown Mode Drops Supply Current to <1m A n cellular telephone applications. High Output Current: Up to 20mA (Depending on V to V Range) CC OUT The LTC1550L/LTC1551L operate from single 2.7V to n Output Regulation: 2.5% Over Line, Load and 5.5V supplies and draw typical quiescent currents of Temperature 3.5mA with a 5V supply. Each device includes a TTL n Available in 8-Lead MSOP, 8-Lead Narrow SO and compatible Shutdown pin which drops supply current to 16-Lead Narrow SSOP 0.2m A typically. The LTC1550L Shutdown pin is active low (SHDN), while the LTC1551L Shutdown pin is active high U (SHDN). Only four external components are required: an APPLICATIO S input bypass capacitor, two 0.1m F charge pump capacitors n GaAs FET Bias Generators and a filter capacitor at the linear regulator output. The n Negative Supply Generators adjustable LTC1550L/LTC1551L require two additional re- n Battery-Powered Systems sistors to set the output voltage. The LTC1550L/LTC1551L n Single Supply Applications will supply up to 20mA (depending on V to V range), CC OUT while maintaining guaranteed output regulation of 2.5%. Both fixed voltage and adjustable LTC1550L/LTC1551L are available in 8-lead MSOP and SO plastic packages: the adjustable LTC1550L is also available in a 16-pin SSOP , LTC and LT are registered trademarks of Linear Technology Corporation. with the REG pin. TYPICAL APPLICATIO V Output Noise and Ripple OUT R1 10k 1 8 3.6V SHDN REG POWER VALID 2 7 V CP CC OUT + 2.2F C CP V LTC1550L-2 OUT C 0.1m F IN 3 6 AC COUPLED + C1 GND 2mV/DIV 4 5 V C1 OUT V = 2V OUT I = 5mA LOAD C OUT C L 10m F 0.1m F C1 1550L/51L TA01 0.1m F Figure 1. 2V Generator with 1mV Noise 5m s/DIV 1550L/51L TA01a P-P 1 + U ULTC1550L/LTC1551L ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage ...................................................... 5.5V Commercial Temperature Range ................. 0 C to 70 C Output Voltage ............................. 0.3V to (V 10.5V) Extended Commercial Operating CC Total Voltage, V to CP .......................................... 10.8V Temperature Range (Note 3) .............. 40 C to 85 C CC OUT Input Voltage (SHDN Pin) ........... 0.3V to (V + 0.3V) Industrial Temperature Range ................ 40 C to 85 C CC Input Voltage (REG Pin) ............................. 0.3V to 6V Storage Temperature Range ................ 65 C to 150 C Output Short-Circuit Duration .............................. 30 sec Lead Temperature (Soldering, 10 sec)................. 300 C PACKAGE/ORDER INFORMATION TOP VIEW TOP VIEW TOP VIEW SHDN* 1 8 REG (ADJ*) SHDN* 1 8 REG (ADJ*) NC 1 16 V CC V 2 7 CP CC OUT + + C1 3 6 GND C1 2 15 SHDN V 2 7 CP CC OUT V 4 5 C1 OUT + NC 3 14 REG C1 3 6 GND MS8 PACKAGE V 4 13 NC OUT V 4 5 C1 8-LEAD PLASTIC MSOP OUT C1 5 12 ADJ *SHDN FOR LTC1550L, SHDN FOR LTC1551L S8 PACKAGE *FOR ADJUSTABLE VERSION PGND 6 11 CP 8-LEAD PLASTIC SO OUT T = 150 C, q = 200 C/W AGND 7 10 NC JMAX JA *SHDN FOR LTC1550L, SHDN FOR LTC1551L NC 8 9 NC *FOR ADJUSTABLE VERSION ORDER PART NUMBER T = 150 C, q = 135 C/W JMAX JA GN PACKAGE 16-LEAD PLASTIC SSOP LTC1550LCMS8 LTC1551LCMS8 ORDER PART NUMBER T = 150 C, q = 150 C/W JMAX JA LTC1550LCMS8-2 LTC1551LCMS8-4.1 LTC1550LCMS8-2.5 LTC1550LCS8 ORDER PART NUMBER LTC1550LCMS8-4.1 LTC1550LCS8-2 LTC1550LCGN LTC1550LCS8-2.5 MS8 PART MARKING LTC1550LIGN LTC1550LCS8-4.1 LTEG LTFQ LTC1551LCS8 GN PART MARKING LTGR LTFT LTC1551LCS8-4.1 LTFV 1550L LTEH 1550LI Consult factory for Military grade parts and additional voltage options. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. A V = 2.7V to 5.25V, C1 = C = 0.1m F, C = 10m F, T = 25 C unless otherwise specified. (Note 3) CC CP OUT A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage CC (Adjustable, Fixed 2V) l 2.7 5.25 V (Fixed 2.5V) l 3.05 5.25 V (Fixed 4.1V) l 4.5 5.25 V V Reference Voltage V = 5V, ADJ = GND, V = V 1.225 V REF CC REF OUT D V Reference Voltage I = 0mA, 2.7V V 5.25V 2.5 mV/V REF OUT CC D (V V Line Regulation CC OUT) I Supply Current V = 5V, V = V (LTC1550L) or GND (LTC1551L) l 3.65 7 mA S CC SHDN CC V = 5V, V = GND (LTC1550L) or V (LTC1551L) l 0.2 10 m A CC SHDN CC 2 U W U U WWW