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MAX1565ETJ+T ,Small, High-Efficiency, Five-Channel Digital Still Camera Power SupplyELECTRICAL CHARACTERISTICS(V = 3.3V, T = 0°C to +85°C, unless otherwise noted.)OUTSU A PARAMETER CO ..
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MAX1565ETJ+-MAX1565ETJ+T
Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply
General DescriptionThe MAX1565 provides a complete power-supply solution
for digital still and video cameras through the integration
of ultra-high-efficiency step-up/step-down DC-to-DC con-
verters along with three auxiliary step-up controllers. The
MAX1565 is targeted for applications that use either 2 or
3 alkaline or NiMH batteries as well as those using a
single lithium-ion (Li+) battery.
The step-up DC-to-DC converter accepts inputs from
0.7V to 5.5V and regulates a resistor-adjustable output
from 2.7V to 5.5V. It uses internal MOSFETs to achieve
95% efficiency. Adjustable operating frequency facili-
tates design for optimum size, cost, and efficiency.
The step-down DC-to-DC converter can produce output
voltages as low as 1.25V and also utilizes internal
MOSFETs to achieve 95% efficiency. An internal soft-
start ramp minimizes surge current from the battery.
The converter can operate from the step-up output pro-
viding buck-boost capability with up to 90% compound
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-
cuits. The device also features low-cost expandability
by supplying power, an oscillator signal, and a refer-
ence to the MAX1801 SOT23 slave controller that sup-
ports step-up, SEPIC, and flyback configurations.
The MAX1565 is available in a space-saving 32-pin thin
QFN package.
ApplicationsDigital Still Cameras
Digital Video Cameras
PDAs
FeaturesStep-Up DC-to-DC Converter
95% Efficient
3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output
VoltageStep-Down DC-to-DC Converter
Operate from Battery for 95% Efficient Buck
Combine with Step-Up for 90% Efficient Buck-
Boost
Adjustable Output Down to 1.25VThree Auxiliary PWM ControllersUp to 1MHz Operating Frequency1µA Shutdown ModeInternal Soft-Start ControlOverload ProtectionCompact 32-Pin, 5mm x 5mm Thin QFN Package
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power SupplyMAX1565
5mm x 5mm
THIN QFNTOP VIEW28293031252627
COMP2GNDDL1DL2FB2DL3OUTSUBFB31315141611129
ON1ON3ON2
REF
ONSU
COMPSU
FBSU
FBSELSUSDOKCOMP3
OUTSUA
LXSU
PGNDB
OSC
FBSEL1
FBSELSDFBSD
COMPSD
ONSD
INSD
LXSD
PGNDA
FB1COMP1
Pin Configuration
Ordering InformationMAIN +3.3V
CORE +1.5V
MOTOR +5V
CCD +15V/-7.5V
LCD, LED +15V
STEP-UP
STEP-DOWN
AUX1
AUX2
AUX30N3
ON2
ON1
ONSD
ONSU
MAX1565
INPUT
+0.7V TO +5.5V
ON/OFF
CONTROLS
Typical Operating Circuit19-2712; Rev 0; 1/03
EVALUATION KIT
AVAILABLEPART TEMP RANGE PIN-PACKAGEMAX1565ETJ -40°C to +85°C 32 Thin QFN
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VOUTSU= 3.3V, TA
= 0°C to +85°C, unless otherwise noted.)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.
OUTSU_, INSD, SDOK, ON_, FB_,
FBSEL_ to GND....................................................-0.3V to +6V
PGND to GND.......................................................-0.3V to +0.3V
DL_ to PGND...........................................-0.3V to OUTSU + 0.3V
LXSU Current (Note 1)..........................................................3.6A
LXSD Current (Note 1)........................................................2.25A
REF, OSC, COMP_ to GND.....................-0.3V to OUTSU + 0.3V
Continuous Power Dissipation (TA=+70°C)
32-Pin Thin QFN (derate 22mW/°C
above +70°C).............................................................1700mW
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
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.
PARAMETER CONDITIONS MIN TYP MAX UNITSGENERALInput Voltage Range (Note 2) 0.7 5.5 VMinimum Startup Voltage ILOAD < 1mA, TA = +25°C, startup voltage tempco is
-2300ppm/°C (typ) (Note 3) 0.9 1.1 VOverload Protection Fault Interval 100,000 OSC
cyclesThermal Shutdown 160 °CThermal-Shutdown Hysteresis 20 °CShutdown Supply Current into
OUTSU ONSU = ONSD = ON1 = ON2 = ON3 = 0; OUTSU = 3.6V 0.1 5 µAStep-Up DC-to-DC Supply
Current into OUTSU ONSU = 3.35V, FBSU = 1.5V
(does not include switching losses) 290 400 µAStep-Up Plus 1 AUX Supply
Current into OUTSU ONSU = ON_ = 3.35V, FBSU = 1.5V, FB_ = 1.5V
(does not include switching losses) 420 600 µAStep-Up Plus Step-Down Supply
Current into OUTSU ONSU = ONSD = 3.35V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses) 470 650 µAReference Output Voltage IREF = 20µA 1.23 1.25 1.27 VReference Load Regulation 10µA < IREF < 200µA 4.5 10 mVReference Line Regulation 2.7 < OUTSU < 5.5V 1.3 5 mVOSC Discharge Trip Level Rising edge 1.225 1.25 1.275 VOSC Discharge Resistance OSC = 1.5V, IOSC = 3mA 52 80 ΩOSC Discharge Pulse Width 300 nsOSC Frequency ROSC = 40kΩ, COSC = 100pF 400 kHz
STEP-UP DC-TO-DC CONVERTERStep-Up Startup-to-Normal
Operating Threshold Rising or falling edge (Note 4) 2.30 2.5 2.60 VStep-Up Startup-to-Normal
Operating Threshold Hysteresis 80 mV
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)(VOUTSU= 3.3V, TA
= 0°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSStep-Up Voltage Adjust Range 2.7 5.5 VFBSU Regulation Voltage 1.231 1.25 1.269 VOUTSU Regulation Voltage FBSELSU = GND 3.296 3.35 3.404 VFBSU to COMPSU
Transconductance FBSU = COMPSU 80 135 185 µSFBSU Input Leakage Current FBSU = 1.25V -100 +1 +100 nAIdle-Mode™ Trip Level (Note 6) 150 200 265 mACurrent-Sense Amplifier
Transresistance 0.3 V/AStep-Up Maximum Duty Cycle FBSU = 1V 80 85 90 %OUTSU Leakage Current VLX = 0V, OUTSU = 5.5V 0.01 20 µALXSU Leakage Current VLXSU = VOUT = 5.5V 0.01 20 µAN-channel 95 150 Switch On-Resistance P-channel 150 250 mΩN-Channel Current limit 1.6 2 2.4 AP-Channel Turn-Off Current 20 mAStartup Current Limit OUTSU = 1.8V (Note 5) 800 mAStartup tOFF OUTSU = 1.8V 700 nsStartup Frequency OUTSU = 1.8V 200 kHz
STEP-DOWN DC-TO-DC CONVERTERFBSD Regulation Voltage 1.231 1.25 1.269 VOUTSD Regulation Voltage FBSELSD = GND 1.48 1.5 1.52 VFBSD to COMPSD
Transconductance FBSD = COMPSD 80 135 185 µSFBSD Input Leakage Current FBSD = 1.25V -100 +1 +100 nAIdle-Mode Trip Level (Note 6) 110 160 190 mACurrent-Sense Amplifier
Transresistance 0.60 V/AVLXSD = 5.5V, OUTSU = 5.5V 0.01 20 LXSD Leakage Current VLXSD = 0V, OUTSU = 5.5V 0.01 20 µAN-channel 95 150 Switch On-Resistance P-channel 150 250 mΩP-Channel Current Limit 0.7 0.79 1.0 AN-Channel Turn-Off Current 20 mASoft-Start Interval 4096 OSC
cyclesSDOK Output Low Voltage FBSD = 0.4V; 0.1mA into SDOK pin 0.002 0.1 VSDOK Operating Voltage Range 1.0 5.5 V
Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)(VOUTSU= 3.3V, TA
= 0°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSAUXILIARY DC-TO-DC CONTROLLERS (AUX 1, 2, AND 3)Maximum Duty Cycle FB_ = 1V 80 85 90 %FB_ Regulation Voltage FB_ = COMP_ 1.231 1.25 1.269 VFB_ to COMP_
Transconductance FB_ = COMP_ 80 135 185 µSFB_ Input Leakage Current FB_ = 1.25V -100 +1 +100 nAAUX1 Output Regulation Voltage FBSEL1 = GND, FB1 connected directly to AUX1 output 4.93 5 5.07 VOutput high 3 10 DL_ Driver Resistance Output low 2 5 ΩDL_ Drive Current Sourcing or sinking 0.5 ASoft-Start Interval 4096 OSC
cycles
LOGIC INPUTS (ON_ , FBSEL_)1.1V < OUTSU < 1.8V (ONSU only) 0.2 Input Low Level 1.8V < OUTSU < 5.5V 0.4 V1.1V < OUTSU < 1.8V (ONSU only) VOUTSU
- 0.2 Input High Level1.8V < OUTSU < 5.5V 1.6 VFBSEL = 3.6V, OUTSU = 3.6V -100 0 +100 FBSEL_ Input Leakage Current FBSEL = GND, OUTSU = 3.6V -100 0 +100 nAON_ Impedance to GND ON_ = 3.35V 330 kΩ
ELECTRICAL CHARACTERISTICS(VOUTSU= 3.3V, TA
= -40°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSGENERALInput Voltage Range (Note 2) 0.7 5.5 VMinimum Startup Voltage ILOAD < 1mA, TA = +25°C, startup voltage tempco is
-2300ppm/°C (typ) (Note 3) 1.1 VShutdown Supply Current into
OUTSU ONSU = ONSD = ON1 = ON2 = ON3 = 0
OUTSU = 3.6V 5 µAStep-Up DC-to-DC Supply
Current into OUTSU ONSU = 3.35V, FBSU = 1.5V
(does not include switching losses) 400 µAStep-Up Plus 1 AUX Supply
Current into OUTSU ONSU = ON_ = 3.35V, FBSU = 1.5V, FB_ = 1.5V
(does not include switching losses) 600 µAStep-Up Plus Step-Down Supply
Current into OUTSU ONSU = ONSD = 3.35V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses) 650 µAReference Output Voltage IREF = 20µA 1.23 1.27 VReference Load Regulation 10µA < IREF < 200µA 10 mV
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)(VOUTSU= 3.3V, TA
= -40°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSReference Line Regulation 2.7V < OUTSU < 5.5V 5 mVOSC Discharge Trip Level Rising edge 1.225 1.275 VOSC Discharge Resistance OSC = 1.5V, IOSC = 3mA 80 Ω
STEP-UP DC-TO-DC CONVERTERStep-Up Startup-to-Normal
Operating Threshold Rising or falling edge (Note 4) 2.30 2.60 VStep-Up Voltage Adjust Range 2.7 5.5 VFBSU Regulation Voltage 1.225 1.275 VOUTSU Regulation Voltage FBSELSU = GND 3.283 3.417 VFBSU to COMPSU
Transconductance FBSU = COMPSU 80 185 µSFBSU Input Leakage Current FBSU = 1.25V -100 +100 nAIdle-Mode Trip Level (Note 6) 150 275 mAStep-Up Maximum Duty Cycle FBSU =1V 80 90 %OUTSU Leakage Current VLX = 0V, OUTSU = 5.5V 20 µALXSU Leakage Current VLXSU = VOUT = 5.5V 20 µAN-channel 150 Switch On-Resistance P-channel 250 mΩN-Channel Current limit 1.6 2.4 A
STEP-DOWN DC-TO-DC CONVERTERFBSD Regulation Voltage 1.225 1.275 VOUTSD Regulation Voltage FBSELSD = GND 1.47 1.53 VFBSD to COMPSD
Transconductance FBSD = COMPSD 80 185 µSFBSD Input Leakage Current FBSD = 1.25V -100 +100 nAIdle-Mode Trip Level (Note 6) 110 195 mAVLXSD = 5.5V, OUTSU = 5.5V 20 LXSD Leakage Current VLXSD = 0V, OUTSU = 5.5V 20 µAN-channel 150 Switch On-Resistance P-channel 250 mΩP-Channel Current Limit 0.7 1.0 ASDOK Output Low Voltage FBSD = 0.4V; 0.1mA into SDOK pin 0.1 VSDOK Operating Voltage Range 1 5.5 V
AUXILIARY DC-TO-DC CONTROLLERS (AUX 1, 2, AND 3)Maximum Duty Cycle FB_ = 1V 80 90 %FB_ Regulation Voltage FB_ = COMP_ 1.225 1.275 V
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)(VOUTSU= 3.3V, TA
= -40°C to +85°C, unless otherwise noted.)PARAMETER CONDITIONS MIN TYP MAX UNITSFB_ to COMP_
Transconductance FB_ = COMP_ 80 185 µSFB_ Input Leakage Current FB_ = 1.25V -100 +100 nAAUX1 Output Regulation Voltage FBSEL1 = GND, FB1 connected directly to AUX1 output 4.90 5.10 VOutput high 10 DL_ Driver Resistance Output low 5 Ω
LOGIC INPUTS (ON_, FBSEL_)1.1V < OUTSU < 1.8V (ONSU only) 0.2 Input Low Level 1.8V < OUTSU < 5.5V 0.4 V1.1V < OUTSU < 1.8V (ONSU only) VOUTSU -0.2 Input High Level1.8V < OUTSU < 5.5V 1.6 VFBSEL = 3.6V, OUTSU = 3.6V -100 +100 FBSEL_ Input Leakage Current FBSEL = GND, OUTSU = 3.6V -100 +100 nA
Note 2:The IC is powered from the OUTSU output.
Note 3:Since the part is powered from OUTSU, a Schottky rectifier, connected from the input battery to OUTSU, is required for
low-voltage startup.
Note 4:The step-up regulator operates in startup mode until this voltage is reached. Do not apply full load current during startup.
Note 5:The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit.
Note 6:The idle-mode current threshold is the transition point between fixed-frequency PWM operation and idle-mode operation
(where switching rate varies with load). The spec is given in terms of inductor current. In terms of output current, the idle-
mode transition varies with input/output voltage ratio and inductor value. For the step-up, the transition output current is
approximately 1/3 the inductor current when stepping from 2V to 3.3V. For the step-down, the transition current in terms of
output current is approximately 3/4 the inductor current when stepping down from 3.3V to 1.8V.
STEP-UP EFFICIENCY
vs. LOAD CURRENT
(5V OUTPUT)MAX1565 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 4V
VIN = 3.6V
VIN = 3V
VIN = 2V
VIN = 1.5V
VOUT = 5V
STEP-UP EFFICIENCY
vs. LOAD CURRENT
(3.3V OUTPUT)MAX1565 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 3.6V
VIN = 3V
VIN = 2V
VIN = 1.5V
VOUT = 3.3V
STEP-DOWN EFFICIENCY
vs. LOAD CURRENTMAX1565 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
INSD CONNECTED TO BATTERY
VOUT = 1.5V
DOES NOT INCLUDE CURRENT USED
BY THE STEP-UP TO POWER THE IC
Typical Operating Characteristics(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
BUCK-BOOST EFFICIENCY
vs. LOAD CURRENT
(1.5V OUTPUT, VOUTSU = 3.3V)MAX1565 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 3V
VIN = 2V
VIN = 1.5V
VOUTSD = 1.5V
VOUTSU = 3.3V
BUCK-BOOST EFFICIENCY
vs. LOAD CURRENT
(3.3V OUTPUT, VOUTSU = 5V)MAX1565 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
VIN = 2V
VIN = 1.5V
VOUTSD = 3.3V
VOUTSU = 5V
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(1.5V OUTPUT, VOUTSU = 3.3V)MAX1565 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
IOUTSD = 250mA
IOUTSD = 500mA
IOUTSD = 100mA
VOUTSD = 1.5V
VOUTSU = 3.3V
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(3.3V OUTPUT, VOUTSU = 5V)MAX1565 toc07
INPUT VOLTAGE (V)
EFFICIENCY (%)
IOUTSD = 250mA
IOUTSD = 500mAIOUTSD = 100mA
VOUTSD = 3.3V
VOUTSU = 5V
BOOST AND BUCK-BOOST COMBINED
EFFICIENCY vs. INPUT VOLTAGEMAX1565 toc08
INPUT VOLTAGE (V)
EFFICIENCY (%)
VOUTSU = 3.3V, 200mA
VOUTSD = 1.5V, 200mA
EFF% = [(VSUISU) + (VSDISD)]/(VINIIN)
AUX_ EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT)MAX1565 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 3.6V
VIN = 3V
VIN = 2V
VIN = 1.5V
VOUTAUX_ = 5V
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)MAX1565 toc10
INPUT VOLTAGE (V)
INPUT CURRENT (mA)32
VOUTSD = 1.5V
VOUTSU = 5V
BUCK-BOOST
(STEP-UP AND STEP DOWN)
STEP-UP
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (OUTSU)MAX1565 toc11
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
*SCHOTTKY DIODE CONNECTED
FROM IN TO OUTSU
WITH SCHOTTKY*
WITHOUT SCHOTTKY*
Typical Operating Characteristics (continued)(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Typical Operating Characteristics (continued)(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
REFERENCE VOLTAGE
vs. TEMPERATUREMAX1565 toc12
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)50250-25
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX1565 toc13
REFERENCE LOAD CURRENT (μA)
REFERENCE VOLTAGE (V)
OSCILLATOR FREQUENCY vs. ROSC
MAX1565 toc14
ROSC (kΩ)
OSCILLATOR FREQUENCY (kHz)
COSC = 470pF
COSC = 220pF
COSC = 100pF
COSC = 47pF
AUX_ MAXIMUM DUTY CYCLE
vs. FREQUENCYMAX1565 toc15
FREQUENCY (kHz)
MAXIMUM DUTY CYCLE (%)
COSC = 100pF
WHEN THIS DUTY CYCLE IS EXCEEDED FOR
100,000 CLOCK CYCLES, THE MAX1565
SHUTS DOWN
STEP-UP STARTUP RESPONSEMAX1565 toc16
100μs/div
IOUTSU
100mA/div
ONSU
5V/div
IIN
1A/div
OUTSU
2V/divVOUTSO = 3.3V
VIN = 2V
BUCK-BOOST STARTUP RESPONSEMAX1565 toc17
4ms/div
OUTSD
500mA/div
ONSD = ONSU
5V/div
IOUTSD
200mA/div
OUTSU
1V/div
VOUTSU = 3.3V
VOUTSD = 1.5V
VIN = 2.5V
AUX_ STARTUP RESPONSEMAX1565 toc18
2ms/div
ON1
5V/div
IOUT1
200mA/div
OUT1
2V/divVOUT1 = 5V
VIN = 2.5V
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
STEP-UP LOAD TRANSIENT RESPONSEMAX1565 toc19
400μs/div
IOUTSU
200mA/div
VOUTSU
AC-COUPLED
100mV/div
VOUTSU = 3.3V
VIN = 2.5V
STEP-DOWN LOAD TRANSIENT RESPONSEMAX1565 toc20
400μs/div
IOUTSD
100mA/div
VOUTSD
AC-COUPLED
50mV/div
VOUTSD = 1.5V
VOUTSU = 3.3V
VIN = 2.5V
Typical Operating Characteristics (continued)(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
Pin DescriptionPIN NAME FUNCTION1 COMP1 Auxiliary Controller 1 Compensation Node. Connect a series RC from COMP1 to GND to compensate the
control loop. COMP1 is actively driven to GND in shutdown and thermal limit.2 FB1Auxiliary Controller 1 Feedback Input. For 5V output, short FBSEL1 to GND and connect FB1 to the output
voltage. For other output voltages, connect FBSEL1 to OUTSU and connect a resistive voltage-divider from
the step-up converter output to FB1 to GND. The FB1 feedback threshold is then 1.25V. This pin is high
impedance in shutdown.3 PGNDA Power Ground. Connect PGNDA and PGNDB together and to GND with short trace as close to the IC as
possible.4 LXSD Step-Down Converter Power-Switching Node. Connect LXSD to the step-down converter inductor. LXSD is
the drain of the P-channel switch and N-channel synchronous rectifier. LXSD is high impedance in
shutdown.5 INSDStep-Down Converter Input. INSD can connect to OUTSU, effectively making OUTSD a buck-boost output
from the battery. Bypass to GND with a 1µF ceramic capacitor if connected to OUTSU. INSD may also be
connected to the battery, but should not exceed OUTSU by more than a Schottky diode forward voltage.
Bypass INSD with a 10µF ceramic capacitor when connecting to the battery input. A 10kΩ internal
resistance connects OUTSU and INSD.6 ONSD Step-Down Converter On/Off Control Input. Drive ONSD high to turn on the step-down converter. This pin
has an internal 330kΩ pulldown resistor. ONSD does not start until OUTSU is in regulation.7 C OM P S D Step-Down Converter Compensation Node. Connect a series RC from COMPSD to GND to compensate the
control loop. COMPSD is pulled to GND in normal shutdown and during thermal shutdown (see the Step-
Down Compensation section).
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Pin Description (continued)PIN NAME FUNCTION8 FBSD Step-Down Converter Feedback Input. For a 1.5V output, short FBSELSD to GND and connect FBSD to
OUTSD. For other voltages, short FBSELSD to OUTSU and connect a resistive voltage-divider from OUTSD
to FBSD to GND. The FBSD feedback threshold is 1.25V. This pin is high impedance in shutdown.9 ON1 Auxiliary Controller 1 On/Off Control Input. Drive ON1 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON1 cannot start until OUTSU is in regulation.10 ON2 Auxiliary Controller 2 On/Off Control Input. Drive ON2 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON2 cannot start until OUTSU is in regulation.11 ON3 Auxiliary Controller 3 On/Off Control Input. Drive ON3 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON3 cannot start until OUTSU is in regulation.12 ONSU Step-Up Converter On/Off Control. Drive ONSU high to turn on the step-up converter. All other control pins
are locked out until 2ms after the step-up output has reached its final value. This pin has an internal 330kΩ
resistance to GND.13 REF Reference Output. Bypass REF to GND with a 0.1µF or greater capacitor. The maximum allowed load on
REF is 200µA. REF is actively pulled to GND when all converters are shut down.14 FBSUStep-Up Converter Feedback Input. To regulate OUTSU to 3.35V, connect FBSELSU to GND. FBSU may be
connected to OUTSU or GND. For other output voltages, connect FBSELSU to OUTSU and connect a
resistive voltage-divider from OUTSU to FBSU to GND. The FBSU feedback threshold is 1.25V. This pin is
high impedance in shutdown.15 COMPSU Step-Up Converter Compensation Node. Connect a series RC from COMPSU to GND to compensate the
control loop. COMPSD is pulled to GND in normal shutdown and during thermal shutdown (see the Step-
Down Compensation section).16 FBSE LS U Step-Up Feedback Select Pin. With FBSELSU = GND, OUTSU regulates to 3.35V. With FBSELSU = OUTSU,
FBSU regulates to a 1.25V threshold for use with external feedback resistors. This pin is high impedance in
shutdown.17 FBSE LS D Step-Down Feedback Select Pin. With FBSELSD = GND, FBSD regulates to 1.5V. With FBSELSD = OUTSU,
FBSD regulates to 1.25V for use with external feedback resistors. This pin is high impedance in shutdown.18 FBSEL1 Auxiliary Controller 1 Feedback Select Pin. With FBSEL1 = GND and FB1 regulates to 5V. With FBSEL1 =
OUTSU, FB1 regulates to 1.25V for use with external feedback resistors. This pin is high impedance in
shutdown.19 OSC Oscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to OUTSU
to set the oscillator frequency between 100kHz and 1MHz. This pin is high impedance in shutdown.20 PGNDB Power Ground. Connect PGNDA and PGNDB together and to GND with short trace as close to the IC as
possible.21 LXSU Step-Up Converter Power-Switching Node. Connect LXSU to the step-up converter inductor. LXSU is high
impedance in shutdown.22 OUTSUA Step-Up Converter Output. OUTSUA is the power output of the step-up converter. Connect OUTSUA to
OUTSUB at the IC.23 SDOK This open-drain output goes high impedance when the step-down has successfully completed soft-start.
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Pin Description (continued)PIN NAME FUNCTION24 COMP3 Auxiliary Controller 3 Compensation Node. Connect a series resistor-capacitor from COMP3 to GND to
compensate the control loop. COMP3 is actively driven to GND in shutdown and thermal limit.25 FB3 Auxiliary Controller 3 Feedback Input. Connect a resistive voltage-divider from the output voltage to FB3 to
GND. The FB3 feedback threshold is 1.25V. This pin is high impedance in shutdown.26 OUTSUB Step-Up Converter Output. OUTSUB powers the MAX1565 and is the sense input when FBSELSU is GND
and the output is 3.3V. Connect OUTSUA to OUTSUB.27 DL3 Auxiliary Controller 3 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL3. DL3 swings
from GND to OUTSU and supplies up to 500mA. DL3 is driven to GND in shutdown and thermal limit.28 DL2 Auxiliary Controller 2 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL2. DL2 swings
from GND to OUTSU and supplies up to 500mA. DL2 is driven to GND in shutdown and thermal limit.29 DL1 Auxiliary Controller 1 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL1. DL1 swings
from GND to OUTSU and supplies up to 500mA. DL1 is driven to GND in shutdown and thermal limit.30 GND Quiet Ground. Connect GND to PGND as close to the IC as possible.31 COMP2 Auxiliary Controller 2 Compensation Node. Connect a series resistor-capacitor from COMP2 to GND to
compensate the control loop. COMP2 is actively driven to GND in shutdown and thermal limit.32 FB2 Auxiliary Controller 2 Feedback Input. Connect a resistive voltage-divider from the output voltage to FB2 to
GND to set the output voltage. The FB2 feedback threshold is 1.25V. This pin is high impedance in
shutdown.Exposed
Pad EP Exposed Underside Metal Pad. This pad must be soldered to the PC board to achieve package thermal and
mechanical ratings. The exposed pad is electrically connected to GND.
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power SupplyMAX1565
DL1
FB1
2μH
VIN
+1.5V TO +4.2V20μF
20μF
OSC
COMPSU
COMPSD
COMP1
COMP2
COMP3
ONSU
ONSD
ON1
ON2
ON3
100pF
GND
OUTSU
OUTSUA
DL3
FB3
DL2
FB2
SDOK
CURRENT-
MODE
STEP-UP
FBSU
LXSU
REF
+1.25V
REF
PGNDB
OUTSUB
AUX2 V-MODE
STEP-UP
PWM
AUX1
V-MODE
STEP-UP
PWM
AUX3
V-MODE
STEP-UP
PWM
TO VIN
90.9kΩ1MΩ
TO VIN0.1
FBSELSU
FBSELSD
FBSEL1
1000pF
10kΩ
36.5kΩ
+15V 20mA
+CCD BIAS
500mA
-7.5V 20mA
-CCD BIAS
+15V 100mA
LCD
47μF
+1.5V
350mA
CORE
3.35V
600mA
MAIN SYSTEM
10μF
1μF
3.3μH
TO VIN TO
STEP-DOWN
DIRECT
FROM
BATTERY
1μF
1μF
10μF
1μF4.7μH
1MΩ
90.9kΩ
INSD
CURRENT-
MODE
STEP-
DOWN
FBSD
LXSD
PGNDA
22μF
4.7μH
1000pF
10kΩ
0.01μF
20kΩ
3300pF
25kΩ
6800pF
47kΩ
Figure 1. Typical Application Circuit
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply2.35V
VOUTSU
ONSU
VREF
ONSU
REFOKDIE OVER
TEMP
FAULT
CLK
NORMAL
MODE
STARTUP
OSCILLATOR
INTERNAL
POWER
100,000
CLOCK CYCLE
FAULT TIMER
REF
VREF
300ns
ONE-SHOT
STARTUP
TIMER
STEP-UP
TIMER
DONE
(SUSSD)
1.25V
REFERENCE
TO INTERNAL
POWER
OSC
COMPSU
FBSU
VREF
SOFT-START
RAMP
GENERATOR
COMPSD
FBSD
ONSDSUSSD
ON_
SUSSD
VREF
SOFT-START
RAMP
GENERATOR
COMP_
FB_
FAULT
CURRENT-
MODE
DC-TO-DC
STEP-DOWN
FAULT
ONE OF 3
VOLTAGE-MODE
DC-TO-DC
CONTROLLERS
AUX_
INSD
LXSD
REF
GND
OUTSUB
PGND
SDOK
DL_
FLTALL
FLTALL
FAULT
CURRENT-
MODE
DC-TO-DC
STEP-UP
OUTSUA
LXSU
PGND
ONSU
FLTALL
FLTALL
Figure 2. MAX1565 Functional Diagram
