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19-0681; Rev 2; 11/07
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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 VSU.
• 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
VSU 5V
VMAIN 3.3V
VSD 1.8V
VDDRZ 2.5V
VLEDBST UP TO 6 WLEDs
VCCDBST +15V
VCCDINV -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.

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Smallest, All-Internal MOSFET, 7-Channel
DSC PMIC in Tiny 5mm x 5mm Thin QFN
VBATT OR VSU
VBATT
(2V TO 5.5V)
C1
22μF
C20
0.1μF
C2
22μF
L1
2μH
VSU
(5V, 500mA)
C3
22μF
R1
402kΩ
C4
22μF
R17
100Ω
C16
0.1μF
R2
100kΩ
C5 VSU
1μF
VMAIN
(3.3V, 300mA)
R3
232kΩ
C6
10μF
C7
10μF
L2
4.7μH
R4
100kΩ
C8
10μF
VBATT
VSD
(1.8V, 250mA)
R5
80kΩ
C10
10μF
C9
10μF
L3
4.7μH
R6
100kΩ
NOTE: ALL CONVERTERS’ POWER GROUND CONNECTIONS
ARE THROUGH THE EXPOSED PADDLE (EP).
24
REF
33 BATT
32 LXSU
31 LXSU
29
PVSU
30 PVSU
16
PVINV
LXINV 15
C18
1μF
D3
L7
4.7μH
FBINV 23
SWBST 17
C19
4.7μF
VCCDINV
(-7.5V, 100mA)
R13
604kΩ
R14
100kΩ
26 SU
MAX8680
27 FBSU
PGSU
(EP)
PGSU
(EP)
38 PVM
39 LXM
1 FBM
PGM
(EP)
34 PVSD
35 LXSD
5
FBSD
PGSD
(EP)
28 ONSU
40 ONM
6 ONSD
10 ONLED
21 ONBST
7 ONINV
2 ONZ
LXBST 19, 20
PGBST
(EP)
FBBST 22
L6
4.7μH
D2
PVBST 18
VBATT
VREF VCCDBST
(15V, 30mA)
C17
1μF R11
1.4MΩ
R12
C16 100kΩ
1μF
VBATT
PVLED 13
SWLED 14
L5
4.7μH
D1
LXLED 11, 12
OVLED 9
C14
1μF
C15
1μF
VLEDBST
(16V, 30mA)
R9
1.6MΩ
R10
100kΩ
D4
D5
D6
D7
FBLED 8
PGLED
(EP)
EP
25
GND
PVZ 36
LXZ 37
VBATT OR
VSU
C11
1μF
L4
4.7μH
C12 C13
10μF 10μF
FBZ 3
PGZ
(EP)
SDOK 4
R16
100kΩ
VBATT
R15
10Ω
VDDRZ
(2.5V, 200mA)
R7
150kΩ
R8
100kΩ
Figure 1. MAX8680 Typical Application Circuit (for Li+ Cell Design, Connect PVZ and PVINV to BATT; for Two-AA or Dual-Battery
Design, Connect PVZ and PVINV to PVSU)
14 ______________________________________________________________________________________