Rainbow Electronics MAX1567 - Manual

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 36 37 38 39
18
21
23
22
24
25
19 20 16 17
6
5
4
3
2
1
7
8
9
10
11 12 13 14 15
26
27
28
29
30
31 32 33 34 35
CCSD
CCM
ON3
MAX1566/MAX1567
TOP VIEW
FB3L CC3 PV 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