MAX1565 19-2712 Rev 0 1/03 Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply General Description Features The MAX1565 provides a complete power-supply solution Step-Up DC-to-DC Converter for digital still and video cameras through the integration 95% Efficient of ultra-high-efficiency step-up/step-down DC-to-DC con- 3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output verters along with three auxiliary step-up controllers. The Voltage MAX1565 is targeted for applications that use either 2 or 3 alkaline or NiMH batteries as well as those using a Step-Down DC-to-DC Converter single lithium-ion (Li+) battery. Operate from Battery for 95% Efficient Buck Combine with Step-Up for 90% Efficient Buck- The step-up DC-to-DC converter accepts inputs from Boost 0.7V to 5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses internal MOSFETs to achieve Adjustable Output Down to 1.25V 95% efficiency. Adjustable operating frequency facili- Three Auxiliary PWM Controllers tates design for optimum size, cost, and efficiency. Up to 1MHz Operating Frequency The step-down DC-to-DC converter can produce output voltages as low as 1.25V and also utilizes internal 1A Shutdown Mode MOSFETs to achieve 95% efficiency. An internal soft- Internal Soft-Start Control start ramp minimizes surge current from the battery. The converter can operate from the step-up output pro- Overload Protection viding buck-boost capability with up to 90% compound Compact 32-Pin, 5mm x 5mm Thin QFN Package efficiency, or it can run directly from the battery if buck- boost operation is not needed. The MAX1565 features auxiliary step-up controllers that power CCD, LCD, motor actuator, and backlight cir- Ordering Information cuits. The device also features low-cost expandability by supplying power, an oscillator signal, and a refer- PART TEMP RANGE PIN-PACKAGE ence to the MAX1801 SOT23 slave controller that sup- MAX1565ETJ -40C to +85C 32 Thin QFN ports step-up, SEPIC, and flyback configurations. The MAX1565 is available in a space-saving 32-pin thin QFN package. Pin Configuration Applications TOP VIEW Digital Still Cameras Digital Video Cameras 32 31 30 29 28 27 26 25 PDAs COMP1 1 24 COMP3 SDOK FB1 2 23 Typical Operating Circuit PGNDA 3 22 OUTSUA INPUT LXSD 4 21 LXSU +0.7V TO +5.5V MAX1565 INSD 5 20 PGNDB MAX1565 ONSD 6 19 OSC STEP-UP MAIN +3.3V COMPSD 7 18 FBSEL1 STEP-DOWN CORE +1.5V FBSD 8 17 FBSELSD 9 10 11 12 13 14 15 16 ONSU AUX1 MOTOR +5V ONSD ON/OFF ON1 AUX2 CCD +15V/-7.5V CONTROLS ON2 0N3 AUX3 LCD, LED +15V 5mm x 5mm THIN QFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE ON1 FB2 ON2 COMP2 ON3 GND ONSU DL1 REF DL2 FBSU DL3 COMPSU OUTSUB FBSELSU FB3Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply ABSOLUTE MAXIMUM RATINGS OUTSU , INSD, SDOK, ON , FB , Continuous Power Dissipation (T =+70C) A FBSEL to GND....................................................-0.3V to +6V 32-Pin Thin QFN (derate 22mW/C PGND to GND .......................................................-0.3V to +0.3V above +70C).............................................................1700mW DL to PGND...........................................-0.3V to OUTSU + 0.3V Operating Temperature Range ...........................-40C to +85C LXSU Current (Note 1) ..........................................................3.6A Junction Temperature......................................................+150C LXSD Current (Note 1) ........................................................2.25A Storage Temperature Range .............................-65C to +150C REF, OSC, COMP to GND.....................-0.3V to OUTSU + 0.3V Lead Temperature (soldering, 10s) .................................+300C Note 1: LXSU has internal clamp diodes to OUTSU and PGND, and LXSD has internal clamp diodes to INSD and PGND. Applications that forward bias these diodes should take care not to exceed the devices power dissipation limits. 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 = 3.3V, T = 0C to +85C, unless otherwise noted.) OUTSU A PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL Input Voltage Range (Note 2) 0.7 5.5 V I < 1mA, T = +25C, startup voltage tempco is LOAD A Minimum Startup Voltage 0.9 1.1 V -2300ppm/C (typ) (Note 3) OSC Overload Protection Fault Interval 100,000 cycles Thermal Shutdown 160 C Thermal-Shutdown Hysteresis 20 C Shutdown Supply Current into ONSU = ONSD = ON1 = ON2 = ON3 = 0 OUTSU = 3.6V 0.1 5 A OUTSU Step-Up DC-to-DC Supply ONSU = 3.35V, FBSU = 1.5V 290 400 A Current into OUTSU (does not include switching losses) Step-Up Plus 1 AUX Supply ONSU = ON = 3.35V, FBSU = 1.5V, FB = 1.5V 420 600 A Current into OUTSU (does not include switching losses) Step-Up Plus Step-Down Supply ONSU = ONSD = 3.35V, FBSU = 1.5V, FBSD = 1.5V 470 650 A Current into OUTSU (does not include switching losses) Reference Output Voltage I = 20A 1.23 1.25 1.27 V REF Reference Load Regulation 10A < I < 200A 4.5 10 mV REF Reference Line Regulation 2.7 < OUTSU < 5.5V 1.3 5 mV OSC Discharge Trip Level Rising edge 1.225 1.25 1.275 V OSC Discharge Resistance OSC = 1.5V, I = 3mA 52 80 OSC OSC Discharge Pulse Width 300 ns OSC Frequency R = 40k , C = 100pF 400 kHz OSC OSC STEP-UP DC-TO-DC CONVERTER Step-Up Startup-to-Normal Rising or falling edge (Note 4) 2.30 2.5 2.60 V Operating Threshold Step-Up Startup-to-Normal 80 mV Operating Threshold Hysteresis 2 MAX1565