MAX1566-MAX1567 Datasheet, PDF (1/35 Pages) Maxim Integrated Products – Six-Channel, High-Efficiency, Digital Camera Power Supplies

19-2882; Rev 1; 4/04
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Six-Channel, High-Efficiency, Digital
Camera Power Supplies
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
Typical Operating Circuit
Li+ OR 2AA
BATTERY INPUT
MAX1567
STEP-UP
SYSTEM 5V
MAIN DC-TO-DC
3.3V LOGIC
ONSU
ONM
ONSD
ON3(LED)
ON1
ON2
STEP-DN
1.8V CORE
AUX3
AUX1
CCD/LCD + 15V
LEDS
AUX2
CCD - 7.5V
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
Ordering Information
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
Pin Configuration
TOP VIEW
40 39 38 37 36 35 34 33 32 31
FB3H 1
CC1 2
FB1 3
ON1 4
PGSD 5
LXSD 6
PVSD 7
ONSD 8
FBSD 9
CCSD 10
MAX1566/MAX1567
30 CC2
29 ON2
28 PVM
27 LXM
26 PGM
25 PVSU
24 LXSU
23 PGSU
22 OSC
21 SDOK
11 12 13 14 15 16 17 18 19 20
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 Maxim’s website at www.maxim-ic.com.