MAX1565ETJ ,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 ..
MAX1565ETJ+ ,Small, High-Efficiency, Five-Channel Digital Still Camera Power Supplyapplications that use either 2 or3 alkaline or NiMH batteries as well as those using a ♦ Step-Down ..
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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
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, Five-Channel
Digital Still Camera Power Supply
Pin Configuration
Ordering Information
Typical Operating Circuit
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.
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS(VOUTSU= 3.3V, TA
= -40°C to +85°C, unless otherwise noted.)
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.)
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.)
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.
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 (%)
BUCK-BOOST EFFICIENCY
vs. LOAD CURRENT
(3.3V OUTPUT, VOUTSU = 5V)MAX1565 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(1.5V OUTPUT, VOUTSU = 3.3V)
MAX1565 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
BUCK-BOOST EFFICIENCY
vs. INPUT VOLTAGE
(3.3V OUTPUT, VOUTSU = 5V)
MAX1565 toc07
INPUT VOLTAGE (V)
EFFICIENCY (%)
BOOST AND BUCK-BOOST COMBINED
EFFICIENCY vs. INPUT VOLTAGE
MAX1565 toc08
INPUT VOLTAGE (V)
EFFICIENCY (%)
AUX_ EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT)
MAX1565 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAX1565 toc10
INPUT VOLTAGE (V)
INPUT CURRENT (mA)32
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (OUTSU)
MAX1565 toc11
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
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.)
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
STEP-DOWN LOAD TRANSIENT RESPONSEMAX1565 toc20
400µs/div
IOUTSD
100mA/div
VOUTSD
AC-COUPLED
50mV/div
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
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Pin Description (continued)
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power SupplyFigure 1. Typical Application Circuit
MAX1565
Small, High-Efficiency, Five-Channel
Digital Still Camera Power SupplyFigure 2. MAX1565 Functional Diagram
