MAX1760EUB+TG069

19-1660; Rev 3; 1/07 KIT ATION EVALU LE B A IL A AV 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter The MAX1760/MAX1760H are high-efficiency, low-noise, step-up DC-DC converters intended for use in batterypowered wireless applications. They combine low quiescent supply current (100µA) with a high 1MHz operating frequency. Small external components and tiny 10-pin TDFN and µMAX® packages make this device an excellent choice for small hand-held applications. The MAX1760 is activated by a logic-low ON signal while the MAX1760H is activated by a logic-high ON input. Both devices use a synchronous-rectified pulse-widthmodulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of inputs, such as 1 to 3 alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Proprietary Idle-Mode™ circuitry significantly improves light-load efficiency and smoothly transitions to fixed-frequency PWM operation at higher load currents. Low-noise, forced-PWM mode is available for applications requiring constant-frequency operation at all load currents. PWM operation can also be synchronized to an external clock to protect sensitive frequency bands in communications equipment. Analog soft-start and adjustable current limit permit optimization of efficiency, external component size, and output voltage ripple. Applications Features ♦ Up to 94% Efficiency ♦ 0.7V to 5.5V Input Range ♦ Up to 800mA Output ♦ ♦ ♦ ♦ ♦ Fixed 3.3V Output (or Adjustable from 2.5V to 5.5V) PWM Synchronous-Rectified Topology Low-Noise, Constant-Frequency Operation (1MHz) 0.1µA Logic-Controlled Shutdown Synchronizable Switching Frequency ♦ ♦ ♦ ♦ Adjustable Current Limit Adjustable Soft-Start 10-Pin µMAX Package 10-Pin 3mm x 3mm TDFN Package Ordering Information PART PINPACKAGE ON LOGIC PKG CODE T1033-1 MAX1760ETB 10 TDFN-EP* Low MAX1760EUB 10 µMAX Low U10-2 MAX1760HETB 10 TDFN-EP* High T1033-1 MAX1760HEUB 10 µMAX High U10-2 Digital Cordless Phones PCS Phones Wireless Handsets Handheld Instruments Palmtop Computers Personal Communicators Note: All devices are specified over the -40°C to +85°C operating temperature range. Typical Operating Circuit Pin Configurations *EP = Exposed paddle. Two-Way Pagers INPUT = 0.7V TO VOUT TOP VIEW MAX1760 ON CLK/SEL POUT VOUT = 3.3V, 800mA ISET REF FB 10 ON (ON) ISET 1 LX ISET 1 9 POUT REF 2 8 LX GND 3 4 7 PGND FB 5 6 CLK/SEL OUT REF 2 GND 3 FB OUT MAX1760 MAX1760H 10 ON (ON) 9 POUT 8 LX 4 7 PGND 5 6 CLK/SEL MAX1760 MAX1760H OUT GND PGND µMAX TDFN (3mm x 3mm) (ON) FOR MAX1760H µMAX is a registered trademark of Maxim Integrated Products, Inc. Idle Mode is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX1760/MAX1760H General Description MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS ON, ON, OUT, CLK/SEL to GND ..................................-0.3V to +6V PGND to GND ..........................................................................±0.3V LX to PGND .................................................-0.3V to (VPOUT + 0.3V) POUT to OUT ...........................................................................±0.3V REF, FB, ISET, POUT to GND.......................-0.3V to (VOUT + 0.3V) Continuous Power Dissipation (TA = +70°C) Single-Layer Board: 10-Pin µMAX (derate 5.6mW/°C above +70°C).................................….444mW 10-Pin TDFN-EP (derate 18.5mW/°C above +70°C) .....1482mW Multilayer Board: 10-Pin µMAX (derate 8.8mW/°C above +70°C) ..........….707mW 10-Pin TDFN-EP (derate 24.4mW/°C above +70°C) .....1951mW Operating Temperature Range................................-40°C to +85°C Junction Temperature ...........................................................+150°C Storage Temperature Range .................................-65°C to +150°C Lead Temperature (soldering, 10s)......................................+300°C 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 (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS V DC-DC CONVERTER Input Voltage Range (Note 1) 0.7 5.5 Minimum Startup Voltage ILOAD < 1mA, TA = +25°C (Note 2) 0.9 1.1 Temperature Coefficient of Startup Voltage ILOAD < 1mA -2.3 Frequency in Startup Mode VOUT = 1.5V 125 500 1000 kHz Internal Oscillator Frequency CLK/SEL = OUT 0.8 1 1.2 MHz Oscillator Maximum Duty Cycle (Note 3) 80 86 External Clock Frequency Range 0.5 V mV/°C 90 % 1.2 MHz Output Voltage VFB < 0.1V, CLK/SEL = OUT, includes load regulation for 0 < ILX < 0.55A 3.17 3.3 3.38 V FB Regulation Voltage Adjustable output, CLK/SEL = OUT, includes load regulation for 0 < ILX < 0.55A 1.215 1.240 1.270 V FB Input Leakage Current VFB = 1.35V (TA = +25°C, MAX1760ETB, MAX1760HETB) 0.01 100 nA Load Regulation CLK/SEL = OUT, no load to full load (0 < ILX < 1.0A) -1.5 Output Voltage Adjust Range 2.5 % 5.5 V 2.15 2.30 V ±0.01 ±50 nA V ON = 3.6V, VON = 0V 0.1 5 µA No-Load Supply Current CLK/SEL = GND (Note 5) 100 185 No-Load Supply Current Forced-PWM Mode CLK/SEL = OUT 2.5 POUT Leakage Current VLX = 0, VOUT = 5.5V (TA = +25°C, MAX1760ETB, MAX1760HETB) 0.1 10 µA LX Leakage Current VLX = VOUT = 5.5V, in shutdown (TA = +25°C, MAX1760ETB, MAX1760HETB) 0.1 10 µA Output Voltage Lockout Threshold Rising edge (Note 4) ISET Input Leakage Current VISET = 1.25V (TA = +25°C, MAX1760ETB, MAX1760HETB) Supply Current in Shutdown 2.00 µA mA DC-DC SWITCHES 2 _______________________________________________________________________________________ 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER Switch On-Resistance TYP MAX N-channel CONDITIONS 0.15 0.28 P-channel 0.25 0.45 N-Channel Current Limit P-Channel Turn-Off Current CLK/SEL = GND MIN UNITS Ω 1.0 1.25 1.6 A 20 60 120 mA 1.230 1.250 1.270 V 5 15 mV 0.2 5 mV 0.2 x VOUT V REFERENCES Reference Output Voltage IREF = 0 Reference Load Regulation -1µA < IREF < +50µA Reference Supply Rejection 2.5V < VOUT < 5V LOGIC INPUTS CLK/SEL Input Low Level 2.5V ≤ VOUT ≤ 5.5V CLK/SEL Input High Level 2.5V ≤ VOUT ≤ 5.5V ON, ON Input Low Level (Note 6) ON, ON Input High Level (Note 6) Input Leakage Current 0.8 x VOUT V 1.1V ≤ VOUT ≤ 1.8V 0.2 1.8V ≤ VOUT ≤ 5.5V 0.4 1.1V ≤ VOUT ≤ 1.8V VOUT - 0.2 1.8V ≤ VOUT ≤ 5.5V 1.6 CLK/SEL, ON, ON (TA = +25°C, MAX1760ETB, MAX1760HETB) V V 0.01 1 µA Minimum CLK/SEL Pulse Width 200 ns Maximum CLK/SEL Rise/Fall Time 100 ns ELECTRICAL CHARACTERISTICS (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) (Note 7) PARAMETER CONDITIONS MIN MAX UNITS DC-DC CONVERTER Output Voltage VFB < 0.1V, CLK/SEL = OUT, includes load regulation for 0 < ILX < 0.55A 3.17 3.38 V FB Regulation Voltage Adjustable output, CLK/SEL = OUT, includes load regulation for 0 < ILX < 0.55A 1.215 1.270 V Internal Oscillator Frequency CLK/SEL = OUT 0.75 1.2 MHz 80 90 % 2.00 2.30 V 5 µA µA Oscillator Maximum Duty Cycle (Note 3) Output Voltage Lockout Threshold Rising edge (Note 4) Supply Current in Shutdown V ON = 3.6V No-Load Supply Current CLK/SEL = GND (Note 5) 185 N-channel 0.28 P-channel 0.45 DC-DC SWITCHES Switch On-Resistance Ω _______________________________________________________________________________________ 3 MAX1760/MAX1760H ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) (Note 7) PARAMETER CONDITIONS N-Channel Current Limit MIN MAX UNITS 1.0 1.6 A 1.230 1.270 V 0.2 x VOUT V REFERENCE Reference Output Voltage IREF = 0 LOGIC INPUTS CLK/SEL Input Low Level 2.5V ≤ VOUT ≤ 5.5V CLK/SEL Input High Level 2.5V ≤ VOUT ≤ 5.5V ON, ON Input Low Level (Note 6) 0.8 x VOUT V 1.1V ≤ VOUT ≤ 1.8V 0.2 1.8V ≤ VOUT ≤ 5.5V 0.4 1.1V ≤ VOUT ≤ 1.8V ON, ON Input High Level (Note 6) V VOUT + 0.2 1.8V ≤ VOUT ≤ 5.5V V 1.6 CLK/SEL, ON, ON Input Leakage Current 1 µA Note 1: Operating voltage—since the regulator is bootstrapped to the output, once started, the MAX1760 operates down to 0.7V input. Note 2: Startup is tested with the circuit shown in Figure 6. Note 3: Defines maximum step-up ratio. Note 4: The regulator is in startup mode until this voltage is reached. Do not apply full load current until the output exceeds 2.3V. Note 5: Supply current into the OUT pin. This current correlates directly to the actual battery-supply current, but is reduced in value according to the step-up ratio and efficiency. Note 6: ON (MAX1760) and ON (MAX1760H) have a hysteresis of approximately 0.15 × VOUT. Note 7: Specifications to -40°C are guaranteed by design and not production tested. Typical Operating Characteristics (Circuit of Figure 2, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.) 70 60 C 50 40 = AUTO MODE = FPWM MODE A: VIN = 2.4V B: VIN = 1.2V C: VIN = 0.9V 30 20 10 0 0.0001 0.001 0.01 0.1 OUTPUT CURRENT (A) 4 EFFICIENCY (%) B B 80 80 70 60 50 40 = AUTO MODE = FPWM MODE A: VIN = 3.6V B: VIN = 2.4V C: VIN = 1.2V 20 10 1 A C 30 0 0.0001 0.9 MAX1760-03 90 0.8 OUTPUT CURRENT (A) A 90 MAX1760-02 100 MAX1760 toc01 100 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE EFFICIENCY vs. OUTPUT CURRENT VOUT = 5V EFFICIENCY vs. OUTPUT CURRENT VOUT = 3.3V EFFICIENCY (%) MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter VOUT = 3.3V 0.7 0.6 VOUT = 5V 0.5 0.4 0.3 0.2 0.1 0.001 0.01 0.1 OUTPUT CURRENT (A) 1 0.5 1.0 1.5 2.0 2.5 3.0 INPUT VOLTAGE (V) _______________________________________________________________________________________ 3.5 4.0 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter NO-LOAD BATTERY CURRENT vs. INPUT VOLTAGE TOTAL SHUTDOWN CURRENT (ILX + IOUT) vs. INPUT VOLTAGE 1.5 1.0 VOUT = 5V 0.5 0.1 3 4 0 5 STARTUP VOLTAGE vs. OUTPUT CURRENT 1 PEAK INDUCTOR CURRENT (A) C 1.5 1.0 0.5 3 4 5 0.75 6 -40 0.01 10 35 60 85 TEMPERATURE (°C) PEAK INDUCTOR CURRENT vs. VISET HEAVY-LOAD SWITCHING WAVEFORMS MAX1760-08 1.2 A 1.0 0.8 B 0.6 0.4 C 0.2 CIRCUIT OF FIGURE 6 -15 INPUT VOLTAGE (V) 1.4 MAX1760-07 2.0 2 0V 0.0 0.1 1 0.1 0.3 0.5 0.7 0.9 1.1 VISET (V) LIGHT-LOAD SWITCHING WAVEFORMS LOAD-TRANSIENT RESPONSE A 1.3 A = LX PIN, 5V/div B = INDUCTOR CURRENT, 200mA/div C = OUTPUT RIPPLE, 50mV/div AC-COUPLED t = 400ns/div LINE-TRANSIENT RESPONSE MAX1760-11 OUTPUT CURRENT (A) MAX1760-10 STARTUP VOLTAGE (V) A = +85°C B = +25°C C = -40°C 0.0 0.001 0.90 MAX1760-09 2 B 0.95 MAX1760-12 1 A 1.00 0.85 INPUT VOLTAGE (V) 2.5 MAX1760-06 MAX1760-05 1 1.05 0.80 0.0 3.0 1.15 1.10 VOUT = 3.3V 0 1.20 FREQUENCY (MHz) SHUTDOWN CURRENT (nA) 2.0 INPUT CURRENT (mA) 10 MAX1760-04 2.5 INTERNAL OSCILLATOR FREQUENCY vs. TEMPERATURE A A B B B C t = 400ns/div A = LX PIN, 5V/div B = INDUCTOR CURRENT, 200mA/div C = OUTPUT RIPPLE, 50mV/div, AC-COUPLED t = 200ms/div VIN = 1.1V, VOUT = 3.3V, IOUT = 0 AND 0.2A A = IOUT, 100mA/div B = VOUT, 50mV/div, AC-COUPLED 400µs/div VIN = 2.4V TO 1.4V, IOUT = 70mA A = VIN, 1V/div B = VOUT, 5mA/div, AC-COUPLED _______________________________________________________________________________________ 5 MAX1760/MAX1760H Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.) TURN-ON WAVEFORMS NO SOFT-START COMPONENTS 12 A MAX1760-15 MAX1760-13 16 SOFT-START WAVEFORMS RSS = 500kΩ, CSS = 0.1µF MAX1760-14 NOISE SPECTRUM NOISE (mVRMS) MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter A 8 B B 4 C 0 C 0V OV 0.1 1 10 FREQUENCY (MHz) t = 2ms/div 2.00ms/div A = ON, 5V/div B = INPUT CURRENT, 500mA/div C = VOUT, 2V/div A = ON, 5V/div B = INPUT CURRENT, 100mA/div C = VOUT, 2V/div Pin Description NAME FUNCTION 1 ISET N-Channel Current-Limit Control. For maximum current limit, connect to REF. To reduce current, supply a voltage between REF and GND by means of a resistive voltage-divider. If soft-start is desired, connect a capacitor from ISET to GND. When ON = high, or VREF