MAX1565 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply

19-2712; Rev 0; 1/03
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Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
General Description
The 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.
Applications
Digital Still Cameras
Digital Video Cameras
PDAs
Typical Operating Circuit
INPUT
+0.7V TO +5.5V
MAX1565
STEP-UP
STEP-DOWN
ON/OFF
CONTROLS
ONSU
ONSD
ON1
ON2
0N3
AUX1
AUX2
AUX3
MAIN +3.3V
CORE +1.5V
MOTOR +5V
CCD +15V/-7.5V
LCD, LED +15V
Features
o Step-Up DC-to-DC Converter
95% Efficient
3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output
Voltage
o Step-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 1.25V
o Three Auxiliary PWM Controllers
o Up to 1MHz Operating Frequency
o 1µA Shutdown Mode
o Internal Soft-Start Control
o Overload Protection
o Compact 32-Pin, 5mm x 5mm Thin QFN Package
PART
MAX1565ETJ
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN
TOP VIEW
Pin Configuration
COMP1 1
FB1 2
PGNDA 3
LXSD 4
INSD 5
ONSD 6
COMPSD 7
FBSD 8
32 31 30 29 28 27 26 25
24 COMP3
23 SDOK
22 OUTSUA
MAX1565
21 LXSU
20 PGNDB
19 OSC
18 FBSEL1
17 FBSELSD
9 10 11 12 13 14 15 16
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 Maxim’s website at www.maxim-ic.com.