LTC1981/LTC1982 Single and Dual Micropower High Side Switch Controllers in SOT-23 FEATURES DESCRIPTIO n No External Components Required The LTC 1981/LTC1982 are low-power, self-contained n Internal Voltage Triplers Produce High Side N-channel MOSFET drivers. An internal voltage tripler Gate Drive for Logic Level FETs allows gates to be driven without the use of any external n Ultralow Power: components. Internal regulation circuitry allows quies- 10m A Per Driver ON Current (LTC1982) cent current to drop to 10m A per driver (20m A for LTC1981) 20m A ON Current (LTC1981) once the gates are charged. <1m A Shutdown Current Low quiescent current and low shutdown current (under n V Range: 1.8V to 5V CC 1m A) make these parts ideal for battery and other power n Gate Drive Outputs Driven to Ground During constrained systems. The wide input voltage range ac- Shutdown commodates a variety of battery/input configurations. n Gate Drive Outputs Internally Clamped to 7.5V Max n Gate drive is internally clamped to 7.5V providing protec- Gate Drive Ready Output (LTC1981) n tion to the external MOSFET gate. The MOSFETs can be Ultrasmall Application Circuit n driven in either high side or low side mode. 5-Pin SOT-23 Package (LTC1981) n 6-Pin SOT-23 Package (LTC1982) The LTC1981 single driver version also includes a gate U drive ready pin and twice the drive current capacity of the APPLICATIO S dual driver LTC1982. n Cellular Telephones The LTC1981 is available in a 5-pin SOT-23. The LTC1982 n Portable POS Terminal is available in a 6-pin SOT-23. n Handheld Battery Powered Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIONS Single High Side Switch Controller Dual High Side Switch Controller V V CC CC 1.8V TO 5.0V 1.8V TO 5.0V Q1 Q1 + + Si3442DV 1/2 Si6925DQ 10m F 10m F Q2 1/2 Si6925DQ 54 654 V GATE V GATE 1 GATE 2 CC CC 100k LTC1981 LOAD LTC1982 LOAD 1 LOAD 2 GDR GND SHDN SHDN 1 GND SHDN 2 GATE 123 123 DRIVE READY SHDN 1 SHDN 1981/82 TA01 1981/82 TA02 SHDN 2 1 U ULTC1981/LTC1982 ABSOLUTE AXI U RATI GS (Notes 1, 2) Terminal Voltage Operating Temperature Range LTC1981: V , GATE, SHDN, GDR ........ 0.3V to 7.5V LTC1981E/LTC1982E (Note 3) ............ 40 C to 85 C CC LTC1982: V , GATE 1, GATE 2, Storage Temperature Range ................. 65 C to 150 C CC SHDN 1, SHDN 2 ................... 0.3V to 7.5V Lead Temperature (Soldering, 10 sec).................. 300 C UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART TOP VIEW NUMBER NUMBER TOP VIEW GDR 1 5 V CC SHDN 1 1 6 V CC LTC1981ES5 LTC1982ES6 GND 2 GND 2 5 GATE 1 SHDN 3 4 GATE SHDN 2 3 4 GATE 2 S5 PART S6 PART S5 PACKAGE S6 PACKAGE MARKING MARKING 5-LEAD PLASTIC SOT-23 6-LEAD PLASTIC SOT-23 T = 150 C, q = 250 C/W T = 150 C, q = 230 C/W JMAX JA JMAX JA LTSF LTPF Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V unless otherwise specified. C = C = C = 1000pF. A CC GATE 1 GATE 2 GATE SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Supply Voltage l 1.8 5.5 V CC I Supply Current GATE 1 and GATE 2 Outputs High l 17 30 m A CC GATE 1 or GATE 2 Outputs High l 10 20 m A GATE Output High (LTC1981) l 17 30 m A I SHDN Supply Current SHDN 1 and SHDN 2 Inputs Low l 1 m A SHDN SHDN Input Low (LTC1981) l 1 m A V GATE Drive Output Voltage V = 1.8V l 4.27 4.50 4.75 V GATE CC V = 2.7V l 6.40 6.75 7.10 V CC V = 3.3V l 6.90 7.25 7.50 V CC V = 5V l 6.90 7.25 7.50 V CC f Charge Pump Oscillator Frequency Measured with 10k Resistor from Output to GND 600 kHz OSC t Turn-on Time into 1000pF From SHDN 1, SHDN 2 Going High to ON GATE 1, GATE 2 = V + 1V 110 m s CC From SHDN Going High to GATE = V +1V (LTC1981) 85 m s CC t Turn-off Time into 1000pF From SHDN 1, SHDN 2 Going Low to OFF GATE 1, GATE 2 GATE = 100mV 12 m s , V SHDN Input Low Voltage V = 1.8V to 5.5V l 0.4 V IL CC V SHDN Input High Voltage V = 1.8V to 5.5V l 1.6 V IH CC C SHDN Input Capacitance (Note 4) 5 pF IN I SHDN Input Leakage Current 1 m A IN 2 U WWW