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General Description

The MAX1566/MAX1567 provide a complete power-

supply solution for digital cameras. They improve perfor-

mance, component count, and size compared to con-

ventional multichannel controllers in 2-cell AA,

1-cell lithium-ion (Li+), and dual-battery designs. On-chip

MOSFETs provide up to 95% efficiency for critical power

supplies, while additional channels operate with external

FETs for optimum design flexibility. This optimizes overall

efficiency and cost, while also reducing board space.

The MAX1566/MAX1567 include six high-efficiency DC-

to-DC conversion channels:

• Step-up DC-to-DC converter with on-chip power FETs

• Main DC-to-DC converter with on-chip FETs, config-

urable to step either up or down

• Step-down core DC-to-DC converter with on-chip

FETs

• DC-to-DC controller for white LEDs or other output

• Extra DC-to-DC controller (typically for LCD); two

extra controllers on the MAX1566

• Transformerless inverting DC-to-DC controller (typi-

cally for negative CCD bias) on the MAX1567

All DC-to-DC channels operate at one fixed frequency

settable from 100kHz to 1MHz to optimize size, cost, and

efficiency. Other features include soft-start, power-OK

outputs, and overload protection. The MAX1566/

MAX1567 are available in space-saving 40-pin thin QFN

packages. An evaluation kit is available to expedite

designs.

Applications

Digital Cameras

PDAs

Features

♦ 95% Efficient Step-Up DC-to-DC Converter

♦ 0.7V Minimum Input Voltage

♦ Main DC-to-DC Configurable as Either Step-Up or

Step-Down

♦ Combine Step-Up and Step-Down for 90%

Efficient Boost-Buck

♦ 95% Efficient Step-Down for DSP Core

♦ Regulate LED Current for Four, Six, or More LEDs

♦ Open LED Overvoltage Protection

♦ Transformerless Inverting Controller (MAX1567)

♦ Three Extra PWM Controllers (Two on the

MAX1567)

♦ Up to 1MHz Operating Frequency

♦ 1µA Shutdown Mode

♦ Soft-Start and Overload Protection

♦ Compact 40-Pin 6mm x 6mm Thin QFN Package

MAX1566/MAX1567

Six-Channel, High-Efficiency, Digital

Camera Power Supplies

________________________________________________________________ Maxim Integrated Products 1

40 36373839

19 2016 17

3132

3435

CCSD

CCM

ON3

MAX1566/MAX1567

TOP VIEW

FB3L

CC3

DL1

DL3

DL2

GND

INDL2

FB2

SUSD

ONM

FBM

CCSU

REF

ONSU

FBSU

SCF

CC2

ON2

PVM

LXM

PGM

PVSU

LXSU

PGSU

OSC

FBSD

ONSD

PVSD

LXSD

PGSD

ON1

FB1

CC1

FB3H

AUX1OK

SDOK

6mm x 6mm

THIN QFN

Pin Configuration

Ordering Information

19-2882; Rev 0; 5/03

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

AUX2

FUNCTION

MAX1566ETL -40°C to +85°C

40 Thin QFN

6mm x 6mm

Step-up

controller

MAX1567ETL -40°C to +85°C

40 Thin QFN

6mm x 6mm

Inverting

controller

Li+ OR 2AA

BATTERY INPUT

SYSTEM 5V

3.3V LOGIC

1.8V CORE

LEDS

CCD/LCD + 15V

CCD - 7.5V

STEP-UP

MAIN DC-TO-DC

STEP-DN

AUX3

AUX1

AUX2

ONSU

ONM

ONSD

ON3(LED)

ON1

ON2

MAX1567

Typical Operating Circuit

Summary of content (35 pages)

PAGE 1
9-2882; Rev 0; 5/03 KIT ATION EVALU E L B AVAILA Six-Channel, High-Efficiency, Digital Camera Power Supplies The MAX1566/MAX1567 include six high-efficiency DCto-DC conversion channels: Features ♦ 95% Efficient Step-Up DC-to-DC Converter ♦ 0.
PAGE 2
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies ABSOLUTE MAXIMUM RATINGS PV, PVSU, SDOK, AUX1OK, SCF, ON_, FB_, SUSD to GND ....................................................... -0.3V to +6V PG_ to GND...........................................................-0.3V to +0.3V DL1, DL3, INDL2, PVM, PVSD to GND …-0.3V to (PVSU + 0.3V) DL2 to GND ............................................-0.3V to (INDL2 + 0.3V) LXSU Current (Note 1) ...............................................
PAGE 3
Six-Channel, High-Efficiency, Digital Camera Power Supplies (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Rising edge or falling edge (Note 4) 2.30 2.5 2.65 V STEP-UP DC-TO-DC Step-Up Startup-to-Normal Operating Threshold Step-Up Startup-to-Normal Operating Threshold Hysteresis 80 Step-Up Voltage Adjust Range 3.0 Start Delay of ONSD, ONM, ON1, ON2, and ON3 after SU in Regulation mV 5.
PAGE 4
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies ELECTRICAL CHARACTERISTICS (continued) (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER Maximum Duty Cycle (Note 6) LXM Leakage Current Switch On-Resistance Main Switch Current Limit Synchronous Rectifier Turn-Off Current CONDITIONS Step-up mode (SUSD = PVSU) MIN TYP MAX 80 85 90 Step-down mode (SUSD = GND) 95 VLXM = 0 to 3.6V, PVSU = 3.6V 0.
PAGE 5
Six-Channel, High-Efficiency, Digital Camera Power Supplies (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS FB3L Regulation Voltage MIN TYP MAX UNITS 0.19 0.2 0.21 V AUX1, AUX2 FB to CC Transconductance 80 135 185 µS AUX3 FBL or FBH to CC Transconductance 50 100 150 µS -100 FB_ Input Leakage Current 0.1 +100 nA DL_ Driver Resistance Output high or low 2.5 7 Ω DL_ Drive Current Sourcing or sinking 0.
PAGE 6
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies ELECTRICAL CHARACTERISTICS (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN MAX UNITS 0.7 GENERAL Input Voltage Range (Note 2) 5.5 V Step-Up Minimum Startup Voltage (Note 2) ILOAD < 1mA, TA = +25°C; startup voltage tempco is -2300ppm/°C (typ) (Note 3) 1.1 V Shutdown Supply Current into PV PV = 3.
PAGE 7
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 ELECTRICAL CHARACTERISTICS (continued) (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN MAX UNITS Main Step-Down Voltage Adjust Range SUSD = GND, PVM must be greater than output (Note 6) 2.45 5.00 V PVM Undervoltage Lockout in Step-Down Mode SUSD = GND (Note 6) 2.45 2.55 V 1.225 1.
PAGE 8
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies ELECTRICAL CHARACTERISTICS (continued) (VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS AUX3 FBL or FBH to CC Transconductance FB_ Input Leakage Current DL_ Driver Resistance Output high or low AUX1OK Output Low 0.1mA into AUX1OK AUX1OK Leakage Current ONSU = GND MIN MAX UNITS 35 150 µS -100 +100 nA 7 Ω 0.
PAGE 9
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAIN (STEP-UP) EFFICIENCY vs. LOAD CURRENT 90 80 EFFICIENCY (%) 40 40 40 30 20 20 20 10 10 VSU = 5V 10 100 0 0 1 1000 10 100 1000 LOAD CURRENT (mA) OUTPUT CURRENT (mA) STEP-DOWN EFFICIENCY vs. LOAD CURRENT BOOST-BUCK EFFICIENCY (SU + SD) vs. LOAD CURRENT 80 60 50 80 40 30 SD = 1.8V SD INPUT CONNECTED TO BATT 20 10 70 VIN = 3.2V VIN = 2.5V VIN = 2.0V VIN = 1.5V 60 50 40 20 100 1000 VM = 3.
PAGE 10
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MINIMUM STARTUP VOLTAGE vs. LOAD CURRENT (OUTSU) VSU = 5.0V + VSD = 1.8V 1.5 1.0 VSU = 5.0V ONLY 2.0 1.5 1.0 0.5 2 3 4 200 400 600 800 1000 LOAD CURRENT (mA) REFERENCE VOLTAGE vs. REFERENCE LOAD CURRENT OSCILLATOR FREQUENCY vs. ROSC MAX1566/67 toc13 1.249 1.248 1.247 1.246 1.245 OSCILLATOR FREQUENCY (kHz) INPUT VOLTAGE (V) 1.250 800 0 50 100 150 200 250 400 200 1 10 AUX_ MAXIMUM DUTY CYCLE vs.
PAGE 11
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAIN (STEP-DOWN MODE) AND STEP-DOWN STARTUP WAVEFORMS MAIN (STEP-UP MODE) AND STEP-DOWN STARTUP WAVEFORMS MAX1566/67 toc20 MAX1566/67 toc19 ONSU = ONSD = ONM 2V/div 0V VSU 5V/div VSD 1V/div 0V VM (MAIN AS BOOST) 2V/div 0V 0V ONSU = ONM = ONSD 2V/div VSU 2V/div 0V 0V VSD 2V/div 0V VM 2V/div 0V (MAIN AS STEP-DOWN) VIN = 3.
PAGE 12
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 Pin Description PIN FUNCTION 1 FB3H AUX3 Controller Voltage Feedback Input. Connect a resistive voltage-divider from the step-up converter output to FBH to set the output voltage. The feedback threshold is 1.25V. This pin is high impedance in shutdown. FB3H can provide conventional voltage feedback (with FB3L grounded) or open-LED protection in white LED drive circuits. 2 CC1 AUX1 Controller Compensation Node.
PAGE 13
Six-Channel, High-Efficiency, Digital Camera Power Supplies PIN NAME FUNCTION 16 CCSU Step-Up Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND for compensating the converter control loop. This pin is actively driven to GND in shutdown, overload, and thermal limit. See the Step-Up Compensation section. 17 FBSU Step-Up Converter Feedback Input. The feedback threshold is 1.25V. This pin is high impedance in shutdown. 18 ONSU Step-Up Converter On/Off Control.
PAGE 14
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 Pin Description (continued) PIN 31 FB2 FUNCTION AUX2 Controller Feedback Input. This pin is high impedance in shutdown. MAX1566 (AUX2 is configured as a boost): FB2 feedback threshold is 1.25V. MAX1567 (AUX2 is configured as an inverter): FB2 feedback threshold is 0V. MAX1566 (AUX2 is configured as a boost): connect INDL2 to PVSU for Voltage Input for AUX2 optimum N-channel gate drive. Gate Driver.
PAGE 15
Six-Channel, High-Efficiency, Digital Camera Power Supplies The MAX1566/MAX1567 include the following blocks to build a multiple-output digital camera power-supply system. Both devices can accept inputs from a variety of sources including 1-cell Li+ batteries, 2-cell alkaline or NiMH batteries, and even systems designed to accept both battery types.
PAGE 16
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies VBATT C16 10µF C15 10µF 1 Li+ 2.8V TO 4.2V AUX1 PWM L1 1.4µH C1 1µF D1 L2 1.2µH OUTSU MAX1567 D6 R11 1MΩ N2 FB1 DL3 R1 1MΩ INDL2 DL2 D2–D5 LEDS C2 0.1µF R3 10Ω VSU D7 AUX3 PWM AUX2 INVERTING PWM FB3L R12 90.9kΩ TO VBATT L3 22µH P1 FB3H R2 90.9kΩ 15V 20mA DL1 OUTSU N1 C18 1µF R13 549kΩ FB2 TO REF R14 90.9kΩ AUX1OK TO VBATT REF PV R4 47kΩ -7.
PAGE 17
Six-Channel, High-Efficiency, Digital Camera Power Supplies C16 10µF C15 10µF 2 AA 1.5V TO 3.4V L2 1.2µH AUX1 PWM L1 1.4µH D1 D6 R11 1MΩ N2 INDL2 TO VSU L3 22µH P1 DL2 FB3H D2–D5 LEDS VSU AUX2 INVERTING PWM FB3L C2 0.1µF R3 10Ω D7 AUX3 PWM R2 90.9kΩ R12 90.9kΩ FB1 DL3 R1 1MΩ 15V 20mA DL1 OUTSU N1 C18 1µF OUTSU MAX1567 C1 1µF FB2 TO REF R14 90.9kΩ AUX1OK TO VBATT REF R4 47kΩ -7.
PAGE 18
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies VBATT C16 10µF C15 10µF 2 AA OR Li+ 1.5V TO 4.2V L2 1.2µH AUX1 PWM L1 1.4µH C1 1µF D1 D6 R11 1MΩ N2 FB1 DL3 R1 1MΩ INDL2 DL2 D2–D5 LEDS C2 0.1µF R3 10Ω VSU D7 AUX3 PWM AUX2 INVERTING PWM FB3L R12 90.9kΩ TO VSU L3 22µH P1 FB3H R2 90.9kΩ 15V 20mA DL1 OUTSU N1 C18 1µF OUTSU MAX1567 R13 549kΩ FB2 TO REF R14 90.9kΩ AUX1OK TO VBATT REF PV R4 47kΩ -7.
PAGE 19
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 INTERNAL POWEROK VSU NORMAL MODE STARTUP OSCILLATOR 2.35V ONSU VREF REFOK DIE OVER TEMP 1V MAX1566 ONSU FLTALL 100,000CLOCK-CYCLE FAULT TIMER FAULT IN TO INTERNAL POWER CLK PV OSC REF 1.
PAGE 20
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies Core Step-Down DC-to-DC Converter The step-down DC-to-DC is optimized for generating low output voltages (down to 1.25V) at high efficiency. The step-down runs from the voltage at PVSD. This pin can be connected directly to the battery if sufficient headroom exists to avoid dropout; otherwise, PVSD can be powered from the output of another converter.
PAGE 21
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 FB2 CC2 R Q DL_ LEVEL SHIFT S REFI SOFT-START REF 0.85 REF MAX1567 AUX2 INVERTER CLK OSC FAULT PROTECTION ENABLE FB CC R Q DL_ LEVEL SHIFT S REFI SOFT-START REF 0.85 REF MAX1566/MAX1567 AUX_ BOOST CLK OSC FAULT PROTECTION ENABLE IN 1024 CLOCK CYCLES, SOFT-START RAMPS UP REFI FROM 0V TO VREF IN MAX1566/MAX1567 AUX_ BOOST CONTROLLERS AND RAMPS DOWN REFI FROM VREF TO 0V IN MAX1567 AUX2 INVERTER. Figure 5.
PAGE 22
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies VSU MAX1566 MAX1567 (PARTIAL) ROSC TO VBATT AUX PWM OSC VREF (1.25V) COSC PVSU Q1 +15V 50mA LCD D6 DL_ 150ns ONE-SHOT FB_ MAX1566 MAX1567 Figure 6. Oscillator Functional Diagram TO VBATT Figure 8. +15V LCD Bias with Basic Boost Topology MAX1566 MAX1567 (PARTIAL) PVSU DL3 FB3H (1.
PAGE 23
Six-Channel, High-Efficiency, Digital Camera Power Supplies +15V 20mA TO VBATT TO VBATT INDL2 DL2 FB_ AUX_ PWM -7.5V 100mA AUX2 INVERTING PWM PVSU RTOP -7.5V 20mA DL_ FB2 RREF REF MAX1566/MAX1567 (PARTIAL) Figure 10. Regulated -7.5V Negative CCD (Bias is provided by conventional inverter (works only with the MAX1567).) IN SHDN GND L1 10µH D2 TO VBATT VOUT+ +15V 20mA C2 1µF 1µF OUT R1 1MΩ FB_ FB_ AUX_ PWM +1.25V PVSU Q1 DL_ C1 1µF D1 R2 90.
PAGE 24
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies INPUT 1-CELL Li+ TO BATT VSU L2 L1 PVSU VOUT D1 PV DL_ PART OF MAX1566 MAX1567 (PARTIAL) DL OUTPUT 3.3V PVSU MAX1801 OSC C2 Q1 IN OSC MAX1566 MAX1567 (PARTIAL) FB R1 COMP REF GND REF DCON FB_ R2 Figure 14. Adding a PWM Channel with an External MAX1801 Slave Controller Figure 13. SEPIC Converter Additional Boost-Buck Channel MAX1566 MAX1567 (PARTIAL) SUSD PVM CURRENTMODE UP OR DOWN PWM LXM L3 VM +3.
PAGE 25
Six-Channel, High-Efficiency, Digital Camera Power Supplies MAX1566/MAX1567 TO VBATT MAX1566 MAX1567 (PARTIAL) PVSU AUX1 PWM DL1 D6 15V 100mA FB1 AUX1OK PV PVSU TO VBATT CURRENTMODE STEP-UP PWM LXSU GATED +5V TO CCD VSU +5V L2 PGSU FBSU Figure 16.
PAGE 26
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies step-up UVLO immediately triggers and shuts down all channels. The step-up then continues to attempt starting. If the step-up output short remains, these attempts cannot succeed since PVSU remains near ground. If a soft-short or overload remains on PVSU, the startup oscillator switches the internal N-channel MOSFET, but fault is retriggered if regulation is not achieved by the end of the soft-start interval.
PAGE 27
Six-Channel, High-Efficiency, Digital Camera Power Supplies Shutdown The step-up converter is activated with a high input at ONSU. The main converter (step-up or step-down) is activated by a high input on ONM. The step-down and auxiliary DC-to-DC converters 1, 2, and 3 activate with high inputs at ONSD, ON1, ON2, and ON3, respectively. The step-down, main, and AUX_ converters cannot be activated until PVSU is in regulation. For automatic startup, connect ON_ to PVSU or a logic level greater than 1.6V.
PAGE 28
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies Schottky diode from the battery to PVSU. See the Minimum Startup Voltage vs. Load Current graph in the Typical Operating Characteristics.
PAGE 29
Six-Channel, High-Efficiency, Digital Camera Power Supplies If CP is calculated to be <10pF, it can be omitted. Step-Down Component Selection This section describes component selection for the step-down converter, and for the main converter if used in step-down mode (SUSD = GND). Step-Down Inductor The external components required for the step-down are an inductor, input and output filter capacitors, and compensation RC network.
PAGE 30
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies If the output filter capacitor has significant ESR, a zero occurs at the following: ZESR = 1 / (2π x COUT x RESR) If ZESR > fC, it can be ignored, as is typically the case with ceramic output capacitors. If ZESR < fC, it should be cancelled with a pole set by capacitor CP connected from CC to GND: CP = COUT x RESR / RC Diode For most AUX applications, a Schottky diode rectifies the output voltage.
PAGE 31
Six-Channel, High-Efficiency, Digital Camera Power Supplies AUX Step-Up, Continuous Inductor Current Continuous inductor current can sometimes improve boost efficiency by lowering the ratio between peak inductor current and output current. It does this at the expense of a larger inductance value that requires larger size for a given current rating.
PAGE 32
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies In that case: CC = (VIN / VRAMP) [VREF / (VREF + |VOUT|)] [gM / (2π x fC)] Place: 1 / (2π x RC x CC) = 1 / (2π x RLOAD x COUT), so that RC = RLOAD x COUT / CC Or, reduce the inductor value for discontinuous operation. Applications Information Typical Operating Circuits Figures 1, 2, and 3 show connections for AA and Li+ battery arrangements. Figures 7–13 show various connections for the AUX1, 2, and 3 controllers.
PAGE 33
Six-Channel, High-Efficiency, Digital Camera Power Supplies SEPIC Boost-Buck The MAX1566/MAX1567s’ internal switch step-up, main, and step-down converters can be cascaded to make a high-efficiency boost-buck converter, but it is sometimes desirable to build a second boost-buck converter with an AUX_ controller. One type of step-up/step-down converter is the SEPIC, shown in Figure 13. Inductors L1 and L2 can be separate inductors or can be wound on a single core and coupled like a transformer.
PAGE 34
MAX1566/MAX1567 Six-Channel, High-Efficiency, Digital Camera Power Supplies Designing a PC Board Good PC board layout is important to achieve optimal performance from the MAX1566/MAX1567. Poor design can cause excessive conducted and/or radiated noise. Conductors carrying discontinuous currents and any high-current path should be made as short and wide as possible.
PAGE 35
Six-Channel, High-Efficiency, Digital Camera Power Supplies QFN THIN 6x6x0.8.EPS D2 D CL D/2 b D2/2 k E/2 E2/2 E (NE-1) X e CL E2 k L e (ND-1) X e CL CL L L e A1 A2 e A PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 36, 40L QFN THIN, 6x6x0.8 mm APPROVAL DOCUMENT CONTROL NO. REV. 21-0141 COMMON DIMENSIONS 1 B 2 EXPOSED PAD VARIATIONS D2 E2 PKG. CODES MIN. NOM. MAX. MIN. NOM. MAX. T3666-1 3.60 3.70 3.80 3.60 3.70 3.80 T4066-1 4.00 4.10 4.20 4.00 4.10 4.