MAX1822 19-1892 Rev 0 1/01 High-Side Power Supply General Description Features The MAX1822 high-side supply, using a regulated +3.5V to +16.5V Operating Supply Voltage Range charge pump, generates a regulated output voltage Output Voltage Regulated to V + 11V (typ) CC 11V greater than the input supply voltage to power high-side switching and control circuits. The MAX1822 150A (typ) Quiescent Current allows low-resistance N-channel MOSFETs (FETs) to be Power-Ready Output used in circuits that normally require costly, less effi- cient P-channel FETs and PNP transistors. The high- side output also eliminates the need for logic FETs in +5V and other low-voltage switching circuits. A +3.5V to +16.5V input supply range and a typical qui- escent current of only 150A make the MAX1822 ideal for a wide range of line- and battery-powered switching and control applications where efficiency is crucial. Also provided is a logic-level power-ready output (PR) to indicate when the high-side voltage reaches the proper level. The MAX1822 comes in an 8-pin SO package and Ordering Information requires three inexpensive external capacitors. The PART TEMP. RANGE PIN-PACKAGE MAX1822 is a pin-for-pin replacement to the MAX622. MAX1822ESA -40C to +85C 8 SO Applications High-Side Power Control with N-Channel FETs Low-Dropout Voltage Regulators Power Switching from Low Supply Voltages H-Switches Stepper Motor Drivers Battery-Load Management Portable Computers Pin Configuration Typical Operating Circuit +3.5V TO +16.5V TOP VIEW 0.1 F 8 C3 CERAMIC 1 V CC C1+ C1+ 1 8 V CC C1 +12.5V TO +27.5V 5 7 V C2- 2 7 C1- C1- OUT MAX1822 6 PR 3 6 C2+ MAX1822 C2+ C2 GND 4 5 V 3 OUT 2 PR C2- GND SO 4 Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.High-Side Power Supply ABSOLUTE MAXIMUM RATINGS V ......................................................................................+17V Operating Temperature Range ...........................-40C to +85C CC V ....................................................................................+30V Storage Temperature Range .............................-65C to +160C OUT I ....................25mA Lead Temperature (soldering, 10s) .................................+300C OUT Continuous Total Power Dissipation (T = +70C) A 8-pin SO (derate 5.88mW/C above +70C)...............471mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +5V, T = T to T , unless otherwise noted.) CC A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.5 16.5 V CC I = 0, V = 3.5V, OUT CC 11.5 12.5 16.5 C1 = C2 = 0.047F, C3 = 1F I = 0, V = 4.5V, C1 = C2 = 0.047F, OUT CC 14.5 15.5 17.5 C3 = 1F I = 0, V = 16.5V, C1 = C2 = 0.01F, OUT CC 26.5 27.5 29.5 C3 = 1F (Note 2) High-Side Voltage (Note 1) V V OUT I = 50A, V = 3.5V, OUT CC 8.5 10.5 16.5 C1 = C2 = 0.047F, C3 = 1F I = 250A, V = 5V, OUT CC 15 18 C1 = C2 = 0.047F, C3 = 1F I = 500A, V = 16.5V, OUT CC 26.5 29.5 C1 = C2 = 0.01F, C3 = 1F (Note 2) Power-Ready Threshold PRT I = 0 (Note 3) 12 13.5 14.5 V OUT Power-Ready Output High PR I = 100A 3.8 4.3 5 V OH SOURCE Power-Ready Output Low PR I = 1mA 0.4 V OL SINK C1 = C2 = 0.01F, C3 = 10F, Output Voltage Ripple VR 50 mV I = 1mA, V = 16.5V OUT CC Switching Frequency F 90 kHz O I = 0, V = 5V, C1 = C2 = 0.047F, OUT CC 150 500 C3 = 1F, T = +25C A Quiescent Supply Current IQ A I = 0, V = 16.5V, C1 = C2 = 0.047F, OUT CC 150 350 C3 = 1F, T = +25C A Note 1: High-side voltage measured with respect to ground. Note 2: For V > +13V on the MAX1822, use C1 = C2 = 0.01F. CC Note 3: Power-Ready Threshold is the voltage with respect to ground at V when PR switches high (PR = V ). OUT CC 2 MAX1822