MAX1566/MAX1567 19-2882 Rev 1 4/04 Six-Channel, High-Efficiency, Digital Camera Power Supplies General Description Features The MAX1566/MAX1567 provide a complete power- 95% Efficient Step-Up DC-to-DC Converter supply solution for digital cameras. They improve perfor- 0.7V Minimum Input Voltage mance, component count, and size compared to con- Main DC-to-DC Configurable as Either Step-Up or ventional multichannel controllers in 2-cell AA, Step-Down 1-cell lithium-ion (Li+), and dual-battery designs. On-chip MOSFETs provide up to 95% efficiency for critical power Combine Step-Up and Step-Down for 90% supplies, while additional channels operate with external Efficient Boost-Buck FETs for optimum design flexibility. This optimizes overall 95% Efficient Step-Down for DSP Core efficiency and cost, while also reducing board space. Regulate LED Current for Four, Six, or More LEDs The MAX1566/MAX1567 include six high-efficiency DC- to-DC conversion channels: Open LED Overvoltage Protection Step-up DC-to-DC converter with on-chip power FETs Transformerless Inverting Controller (MAX1567) Main DC-to-DC converter with on-chip FETs, config- Three Extra PWM Controllers (Two on the urable to step either up or down MAX1567) Step-down core DC-to-DC converter with on-chip Up to 1MHz Operating Frequency FETs 1A Shutdown Mode DC-to-DC controller for white LEDs or other output Soft-Start and Overload Protection Extra DC-to-DC controller (typically for LCD) two Compact 40-Pin 6mm x 6mm Thin QFN Package extra controllers on the MAX1566 Transformerless inverting DC-to-DC controller (typi- Ordering Information cally for negative CCD bias) on the MAX1567 AUX2 PART TEMP RANGE PIN-PACKAGE All DC-to-DC channels operate at one fixed frequency FUNCTION settable from 100kHz to 1MHz to optimize size, cost, and 40 Thin QFN Step-up efficiency. Other features include soft-start, power-OK MAX1566ETL -40C to +85C 6mm x 6mm controller outputs, and overload protection. The MAX1566/ MAX1567 are available in space-saving 40-pin thin QFN 40 Thin QFN Inverting MAX1567ETL -40C to +85C packages. An evaluation kit is available to expedite 6mm x 6mm controller designs. Applications Pin Configuration Digital Cameras TOP VIEW PDAs 40 39 38 37 36 35 34 33 32 31 Typical Operating Circuit FB3H 1 30 CC2 CC1 2 29 ON2 Li+ OR 2AA 3 28 BATTERY INPUT FB1 PVM MAX1567 ON1 4 27 LXM SYSTEM 5V STEP-UP PGSD 5 26 PGM MAX1566/MAX1567 MAIN DC-TO-DC 3.3V LOGIC LXSD 6 25 PVSU 24 PVSD 7 LXSU STEP-DN 1.8V CORE ONSU ONSD 8 23 PGSU ONM AUX3 FBSD 9 22 OSC ONSD CCSD 10 21 SDOK LEDS AUX1 CCD/LCD + 15V ON3(LED) 11 12 13 14 15 16 17 18 19 20 ON1 AUX2 CCD - 7.5V ON2 6mm x 6mm 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 SUSD ON3 CCM FB3L CC3 FBM PV ONM DL1 REF CCSU DL3 FBSU DL2 ONSU GND INDL2 SCF FB2 AUX1OKSix-Channel, High-Efficiency, Digital Camera Power Supplies ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (T = +70C) PV, PVSU, SDOK, AUX1OK, SCF, ON , FB , A SUSD to GND....................................................... -0.3V to +6V 40-Pin Thin QFN (derate 26.3mW/C above +70C) .2105mW Operating Temperature Range ...........................-40C to +85C PG to GND...........................................................-0.3V to +0.3V DL1, DL3, INDL2, PVM, PVSD to GND -0.3V to (PVSU + 0.3V) Junction Temperature......................................................+150C Storage Temperature Range .............................-65C to +150C DL2 to GND ............................................-0.3V to (INDL2 + 0.3V) LXSU Current (Note 1) ..........................................................3.6A Lead Temperature (soldering, 10s) .................................+300C LXM Current (Note 1)............................................................3.6A LXSD Current (Note 1) ........................................................2.25A REF, OSC, CC to GND...........................-0.3V to (PVSU + 0.3V) Note 1: LXSU has internal clamp diodes to PVSU and PGSU, LXM has internal clamp diodes to PVM and PGM, and LXSD has inter- nal clamp diodes to PVSD and PGSD. 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 = V = V = V = V = 3.6V, T = 0C to +85C, unless otherwise noted.) PVSU PV PVM PVSD INDL2 A PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL Input Voltage Range (Note 2) 0.7 5.5 V Step-Up Minimum Startup I < 1mA, T = +25C startup voltage tempco is LOAD A 0.9 1.1 V Voltage (Note 2) -2300ppm/C (typ) (Note 3) Shutdown Supply Current into PV PV = 3.6V 0.1 10 A Supply Current into PV with Step- ONSU = 3.6V, FBSU = 1.5V 300 450 A Up Enabled (does not include switching losses) Supply Current into PV with Step- ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V 450 700 A Up and Step-Down Enabled (does not include switching losses) Supply Current into PV with Step- ONSU = ONM = 3.6V, FBSU = 1.5V, FBSD = 1.5V 450 700 A Up and Main Enabled (does not include switching losses) Total Supply Current from PV and ONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V PVSU with Step-Up and One 400 650 A (does not include switching losses) AUX Enabled REFERENCE 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 < PVSU < 5.5V 1.3 5 mV OSCILLATOR 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 200 ns OSC Frequency R = 47k , C = 100pF 500 kHz OSC OSC 2 MAX1566/MAX1567