19-2882; Rev 1; 4/04
KIT
ATION
EVALU
BLE
AVAILA
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
General Description
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
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.
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
40 Thin QFN
6mm x 6mm
40 Thin QFN
6mm x 6mm
AUX2
FUNCTION
Step-up
controller
Inverting
controller
MAX1566ETL
-40°C to +85°C
MAX1567ETL
-40°C to +85°C
Applications
FB3L
Pin Configuration
GND
ON3
CC3
DL1
DL3
DL2
FB2
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
PDAs
Typical Operating Circuit
FB3H
1
40 39 38 37 36 35 34 33 32 31
Li+ OR 2AA
BATTERY INPUT
MAX1567
STEP-UP
MAIN DC-TO-DC
ONSU
ONM
ONSD
ON3(LED)
ON1
ON2
STEP-DN
AUX3
AUX1
AUX2
CCD/LCD + 15V
CCD - 7.5V
LEDS
SYSTEM 5V
3.3V LOGIC
1.8V CORE
CC1
2
FB1
3
ON1
4
PGSD
5
LXSD
6
MAX1566/MAX1567
PVSD
7
ONSD
8
FBSD
9
CCSD
10
AUX1OK
SUSD
FBM
ONM
REF
CCSU
FBSU
ONSU
CCM
SCF
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.
PV
TOP VIEW
INDL2
Digital Cameras
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAX1566/MAX1567
ABSOLUTE MAXIMUM RATINGS
PV, PVSU,
SDOK, AUX1OK,
SCF, ON_, FB_,
SUSD to GND ....................................................... -0.3V to +6V
PG_ to GND...........................................................-0.3V to +0.3V
DL1, DL3, INDL2, PVM, PVSD to GND …-0.3V to (PVSU + 0.3V)
DL2 to GND ............................................-0.3V to (INDL2 + 0.3V)
LXSU Current (Note 1) ..........................................................3.6A
LXM Current (Note 1) ............................................................3.6A
LXSD Current (Note 1) ........................................................2.25A
REF, OSC, CC_ to GND...........................-0.3V to (PVSU + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
40-Pin Thin QFN (derate 26.3mW/°C above +70°C) .2105mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
LXSU has internal clamp diodes to PVSU and PGSU, LXM has internal clamp diodes to PVM and PGM, and LXSD has inter-
nal clamp diodes to PVSD and PGSD. Applications that forward bias these diodes should take care not to exceed the
devices’ power dissipation limits.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
PVSU
= V
PV
= V
PVM
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
GENERAL
Input Voltage Range
Step-Up Minimum Startup
Voltage (Note 2)
Shutdown Supply Current into PV
Supply Current into PV with Step-
Up Enabled
Supply Current into PV with Step-
Up and Step-Down Enabled
Supply Current into PV with Step-
Up and Main Enabled
Total Supply Current from PV and
PVSU with Step-Up and One
AUX Enabled
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference Line Regulation
OSCILLATOR
OSC Discharge Trip Level
OSC Discharge Resistance
OSC Discharge Pulse Width
OSC Frequency
R
OSC
= 47kΩ, C
OSC
= 100pF
Rising edge
OSC = 1.5V, I
OSC
= 3mA
1.225
1.25
52
200
500
1.275
80
V
Ω
ns
kHz
I
REF
= 20µA
10µA < I
REF
< 200µA
2.7 < PVSU < 5.5V
1.23
1.25
4.5
1.3
1.27
10
5
V
mV
mV
(Note 2)
I
LOAD
< 1mA, T
A
= +25°C; startup voltage tempco is
-2300ppm/°C (typ) (Note 3)
PV = 3.6V
ONSU = 3.6V, FBSU = 1.5V
(does not include switching losses)
ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
ONSU = ONM = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
ONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses)
0.7
0.9
0.1
300
450
450
5.5
1.1
10
450
700
700
V
V
µA
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
400
650
µA
2
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVM
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
STEP-UP DC-TO-DC
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Startup-to-Normal
Operating Threshold Hysteresis
Step-Up Voltage Adjust Range
Start Delay of ONSD, ONM,
ON1, ON2, and ON3 after
SU in Regulation
FBSU Regulation Voltage
FBSU to CCSU Transconductance
FBSU Input Leakage Current
Idle Mode
TM
MAX1566/MAX1567
CONDITIONS
MIN
TYP
MAX
UNITS
Rising edge or falling edge (Note 4)
2.30
2.5
80
2.65
V
mV
3.0
1024
1.231
FBSU = CCSU
FBSU = 1.25V
80
-100
1.25
135
0.01
150
0.275
FBSU = 1V
V
LX
= 0V, PVSU = 3.6V
V
LX
= V
OUT
= 3.6V
N channel
P channel
1.8
PVSU = 1.8V (Note 5)
PVSU = 1.8V
PVSU = 1.8V
80
85
0.1
0.1
95
150
2.1
20
450
700
200
5.5
V
OSC
cycles
1.269
185
+100
V
µS
nA
mA
V/A
Trip Level
Current-Sense Amplifier
Transresistance
Step-Up Maximum Duty Cycle
PVSU Leakage Current
LXSU Leakage Current
Switch On-Resistance
N-Channel Current Limit
P-Channel Turn-Off Current
Startup Current Limit
Startup t
OFF
Startup Frequency
MAIN DC-TO-DC CONVERTER
Main Step-Up Voltage
Adjust Range
Main Step-Down Voltage
Adjust Range
PVM Undervoltage Lockout in
Step-Down Mode
Regulation Voltage
FBM to CCM Transconductance
FBM Input Leakage Current
Idle Mode Trip Level
Current-Sense Amplifier
Transresistance
FBM = CCM
FBM = 1.25V
Step-up mode (SUSD = PVSU)
Step-down mode (SUSD = GND)
Step-up mode (SUSD = PVSU)
Step-down mode (SUSD = GND)
SUSD = PVSU
SUSD = GND, PVM must be greater than output (Note 6)
SUSD = GND (Note 6)
3
2.45
2.45
1.231
80
-100
90
5
5
150
250
2.4
%
µA
µA
mΩ
A
mA
mA
ns
kHz
5.5
5.00
2.5
1.25
135
0.01
150
100
0.25
0.5
2.55
1.269
185
+100
V
V
V
V
µS
nA
mA
V/A
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
3
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAX1566/MAX1567
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVM
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
Maximum Duty Cycle (Note 6)
LXM Leakage Current
Switch On-Resistance
Main Switch Current Limit
Synchronous Rectifier
Turn-Off Current
Soft-Start Interval
STEP-DOWN DC-TO-DC CONVERTER
Step-Down Output-Voltage Adjust
PVSD must be greater than output (Note 7)
Range
FBSD Regulation Voltage
FBSD to CCSD
Transconductance
FBSD Input Leakage Current
Idle Mode Trip Level
Current-Sense Amplifier
Transresistance
LXSD Leakage Current
Switch On-Resistance
P-Channel Current Limit
N-Channel Turn-Off Current
Soft-Start Interval
SDOK
Output Low Voltage
SDOK
Leakage Current
INDL2 Undervoltage
Lockout
Maximum Duty Cycle
FB1, FB2 (MAX1566), FB3H
Regulation Voltage
FB2 (MAX1567) Inverter
Regulation Voltage
FB_ = 1V
0.1mA into
SDOK
ONSU = GND
V
LXSD
= 0 to 3.6V, PVSU = 3.6V
N channel
P channel
0.65
FBSD = CCSD
FBSD = 1.25V
1.25
1.231
80
-100
1.25
135
0.1
100
0.5
0.1
95
150
0.77
20
2048
0.01
0.01
0.1
1
5
150
250
0.90
5.00
1.269
185
+100
V
V
µS
nA
mA
V/A
µA
mΩ
A
mA
OSC
cycles
V
µA
CONDITIONS
Step-up mode (SUSD = PVSU)
Step-down mode (SUSD = GND)
V
LXM
= 0 to 3.6V, PVSU = 3.6V
N channel
P channel
Step-up mode (SUSD = PVSU)
Step-down mode (SUSD = GND)
Step-up mode (SUSD = PVSU)
Step-down mode (SUSD = GND)
1.8
0.70
MIN
80
TYP
85
95
0.1
95
150
2.1
0.8
20
20
4096
5
150
250
2.4
0.95
MAX
90
UNITS
%
µA
mΩ
A
mA
OSC
cycles
AUX1, 2, 3 DC-TO-DC CONTROLLERS
2.45
80
1.231
-0.01
2.5
85
1.25
0
2.55
90
1.269
+0.01
V
%
V
V
4
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVM
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
FB3L Regulation Voltage
AUX1, AUX2 FB to CC
Transconductance
AUX3 FBL or FBH to CC
Transconductance
FB_ Input Leakage Current
DL_ Driver Resistance
DL_ Drive Current
Soft-Start Interval
AUX1OK
Output Low Voltage
AUX1OK
Leakage Current
OVERLOAD PROTECTION
Overload Protection Fault Delay
SCF Leakage Current
SCF Output Low Voltage
THERMAL-LIMIT PROTECTION
Thermal Shutdown
Thermal Hysteresis
LOGIC INPUTS (ON_, SUSD)
1.1V < PVSU < 1.8V
ONSU Input Low Level
1.8V
≤
PVSU < 2.5V
2.5V
≤
PVSU < 5.5V
1.1V < PVSU < 1.8V
ONSU Input High Level
1.8V < PVSU < 5.5V
ONM, ONSD, ON1, ON2, ON3,
SUSD Input Low Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input High Level
SUSD Input Leakage
ON_ Impedance to GND
2.7V < PVSU < 5.5V (Note 8)
2.7V < PVSU < 5.5V (Note 8)
1.6
0.1
330
1
(PVSU
- 0.2)
1.6
0.5
V
V
µA
kΩ
0.2
0.4
0.5
V
V
160
20
°C
°C
ONSU = PVSU, FBSU = 1.5V
0.1mA into SCF
100,000
0.1
0.01
1
0.1
OSC
cycles
µA
V
0.1mA into
AUX1OK
ONSU = GND
Output high or low
Sourcing or sinking
CONDITIONS
MIN
0.19
80
50
-100
TYP
0.2
135
100
0.1
2.5
0.5
4096
0.01
0.01
0.1
1
MAX
0.21
185
150
+100
7
UNITS
V
µS
µS
nA
Ω
A
OSC
cycles
V
µA
MAX1566/MAX1567
_______________________________________________________________________________________
5
