MAX8680 Datasheet, PDF (1/2 Pages) Maxim Integrated Products – Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN

ABRIDGED
19-0681; Rev 2; 11/07
EVAALVUAAILTAIOBNLEKIT
Smallest, All-Internal MOSFET, 7-Channel
DSC PMIC in Tiny 5mm x 5mm Thin QFN
General Description
The MAX8680 highly efficient complete power-supply
solution is designed for digital still cameras (DSCs) and
digital video cameras (DVCs). The device integrates
seven on-chip power MOSFET DC-DC converters with
up to 95% efficiency to power all critical power supplies
in DSC systems. Each converter also features True
Shutdown™, as well as internal compensation to mini-
mize external component count. The seven DC-DC
converter outputs are:
• Step-up synchronous-rectified DC-DC converter
(SU). The MAX8680 is bootstrapped from V_SU.
• MAIN synchronous-rectified step-down DC-DC con-
verter (M) for DSP I/O supply voltage.
• DDRZ synchronous-rectified step-down DC-DC
converter (Z) for DSP DDR supply voltage.
• Low-voltage (down to 1V) synchronous-rectified
step-down DC-DC converter (SD) for DSP core sup-
ply voltage.
• High-voltage, step-up DC-DC converter with current
regulation and PWM dimming control (LEDBST) for
white LEDs (WLED).
• High-voltage step-up DC-DC converter (CCDBST)
for CCD imagers or positive LCD bias supplies.
• Transformerless inverting DC-DC converter (CCDINV)
for CCD imagers or negative LCD bias supplies.
The MAX8680 has an independent/simultaneous
power-on sequence of the CCDBST and CCDINV con-
verters. For a preset power-on sequence of CCDBST
before CCDINV, contact the factory.
The MAX8680 operates with 1-cell lithium-ion (Li+) bat-
tery, two-AA cell, or dual-battery designs and is avail-
able in a 5mm x 5mm, 40-pin thin QFN package. The
MAX8680 operates over the -40°C to +85°C extended
temperature range.
Applications
DSCs and DVCs
PDAs and Portable Media Players
GPS Navigation Systems
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
MAX8680ETL+ ^{-40°C to 40 Thin QFN-EP*}
+85°C 5mm x 5mm x 0.8mm
+Denotes a lead-free package.
*EP= Exposed paddle.
T4055-2
Features
♦ 95% Efficient Synchronous-Rectified DC-DC
Converters
♦ 90% Efficient Boost-Buck Operation
♦ 85% Efficient DC-DC Converters for CCD, LCD,
WLED, and/or OLED
♦ Internal Compensation on All Channels
♦ True Shutdown on All Step-Up Converters
♦ Overload Protection
♦ Soft-Start for Controlled Startup Current
♦ Dropout Operation (100% Duty Cycle) on Step-
Down Converters
♦ Regulated Current Output for Up to 6 White LEDs
♦ PWM Dimming of WLED Current
♦ Adjustable LED Overvoltage Protection Up to 27V
♦ Transformerless Inverting Converter for CCD
♦ 2MHz Switching Frequency for Low-Voltage
Channels
♦ ±2.5% Switching Frequency Accuracy
♦ 1µA Shutdown Supply Current
♦ Power-On Voltage Tracking for Core and Main
Outputs
♦ All Internal Power MOSFETs
♦ SDOK Power-OK Indicator
Typical Operating Circuit
INPUT
2.7V TO 5.5V
BATT
ONSU
ONM
SU STEP-UP
MAIN STEP-DOWN
SD STEP-DOWN
ONSD ^{DDRZ STEP-DOWN}
ONZ
SDOK
MAX8680
ONLED
LEDBST
ONBST
CCDBST
ONINV
CCDINV
V_SU 5V
V_MAIN 3.3V
V_SD 1.8V
V_DDRZ 2.5V
V_LEDBST UP TO 6 WLEDs
V_CCDBST +15V
V_CCDINV -7.5V
Pin Configuration appears at the end of data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.