19-2882; Rev 1; 4/04
KIT
ATION
EVALU
E
L
B
AVAILA
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
The MAX1566/MAX1567 provide a complete powersupply solution for digital cameras. They improve performance, component count, and size compared to conventional 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 DCto-DC conversion channels:
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
• Step-up DC-to-DC converter with on-chip power FETs
♦ Transformerless Inverting Controller (MAX1567)
• Main DC-to-DC converter with on-chip FETs, configurable to step either up or down
♦ Three Extra PWM Controllers (Two on the
MAX1567)
• Step-down core DC-to-DC converter with on-chip
FETs
♦ Up to 1MHz Operating Frequency
• DC-to-DC controller for white LEDs or other output
♦ Soft-Start and Overload Protection
♦ Compact 40-Pin 6mm x 6mm Thin QFN Package
Ordering Information
• Transformerless inverting DC-to-DC controller (typically for negative CCD bias) on the MAX1567
PART
TEMP RANGE PIN-PACKAGE
40 Thin QFN
6mm x 6mm
Step-up
controller
MAX1567ETL -40°C to +85°C
40 Thin QFN
6mm x 6mm
Inverting
controller
Applications
Typical Operating Circuit
Li+ OR 2AA
BATTERY INPUT
MAX1567
STEP-UP
SYSTEM 5V
STEP-DN
ONSU
ONM
AUX1
1.8V CORE
CCD/LCD + 15V
FB2
INDL2
GND
DL2
30 CC2
CC1 2
29 ON2
FB1 3
28 PVM
ON1 4
27 LXM
26 PGM
MAX1566/MAX1567
25 PVSU
LXSD 6
AUX3
ONSD
ON3(LED)
LEDS
PVSD 7
24 LXSU
ONSD 8
23 PGSU
FBSD 9
22 OSC
CCSD 10
21 SDOK
AUX1OK
SCF
ONSU
FBSU
REF
CCSU
ONM
CCD - 7.5V
FBM
AUX2
CCM
11 12 13 14 15 16 17 18 19 20
SUSD
ON1
ON2
3.3V LOGIC
CC3
40 39 38 37 36 35 34 33 32 31
FB3H 1
PGSD 5
MAIN DC-TO-DC
PV
TOP VIEW
PDAs
FB3L
Pin Configuration
ON3
Digital Cameras
AUX2
FUNCTION
MAX1566ETL -40°C to +85°C
DL3
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.
DL1
• Extra DC-to-DC controller (typically for LCD); two
extra controllers on the MAX1566
♦ 1µA Shutdown Mode
6mm x 6mm
THIN QFN
________________________________________________________________ Maxim Integrated Products
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.
1
MAX1566/MAX1567
General Description
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
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 (TA = +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 internal 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
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5.5
V
GENERAL
Input Voltage Range
(Note 2)
0.7
Step-Up Minimum Startup
Voltage (Note 2)
ILOAD < 1mA, TA = +25°C; startup voltage tempco is
-2300ppm/°C (typ) (Note 3)
0.9
1.1
V
Shutdown Supply Current into PV
PV = 3.6V
0.1
10
µA
Supply Current into PV with StepUp Enabled
ONSU = 3.6V, FBSU = 1.5V
(does not include switching losses)
300
450
µA
Supply Current into PV with StepUp and Step-Down Enabled
ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
450
700
µA
Supply Current into PV with StepUp and Main Enabled
ONSU = ONM = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
450
700
µA
Total Supply Current from PV and
PVSU with Step-Up and One
AUX Enabled
ONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses)
400
650
µA
REFERENCE
Reference Output Voltage
IREF = 20µA
1.25
1.27
V
Reference Load Regulation
10µA < IREF < 200µA
1.23
4.5
10
mV
Reference Line Regulation
2.7 < PVSU < 5.5V
1.3
5
mV
1.25
1.275
V
52
80
OSCILLATOR
OSC Discharge Trip Level
Rising edge
OSC Discharge Resistance
OSC = 1.5V, IOSC = 3mA
OSC Discharge Pulse Width
OSC Frequency
2
ROSC = 47kΩ, COSC = 100pF
1.225
Ω
200
ns
500
kHz
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Rising edge or falling edge (Note 4)
2.30
2.5
2.65
V
STEP-UP DC-TO-DC
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Startup-to-Normal
Operating Threshold Hysteresis
80
Step-Up Voltage Adjust Range
3.0
Start Delay of ONSD, ONM,
ON1, ON2, and ON3 after
SU in Regulation
mV
5.5
OSC
cycles
1024
FBSU Regulation Voltage
V
1.231
1.25
1.269
V
FBSU to CCSU Transconductance
FBSU = CCSU
80
135
185
µS
FBSU Input Leakage Current
FBSU = 1.25V
-100
0.01
+100
Idle ModeTM Trip Level
Current-Sense Amplifier
Transresistance
mA
0.275
V/A
Step-Up Maximum Duty Cycle
FBSU = 1V
85
90
%
PVSU Leakage Current
VLX = 0V, PVSU = 3.6V
0.1
5
µA
LXSU Leakage Current
VLX = VOUT = 3.6V
0.1
5
µA
N channel
95
150
P channel
150
250
2.1
2.4
Switch On-Resistance
N-Channel Current Limit
80
nA
150
1.8
P-Channel Turn-Off Current
mΩ
A
20
mA
Startup Current Limit
PVSU = 1.8V (Note 5)
450
mA
Startup tOFF
PVSU = 1.8V
700
ns
Startup Frequency
PVSU = 1.8V
200
kHz
MAIN DC-TO-DC CONVERTER
Main Step-Up Voltage
Adjust Range
SUSD = PVSU
Main Step-Down Voltage
Adjust Range
PVM Undervoltage Lockout in
Step-Down Mode
3
5.5
V
SUSD = GND, PVM must be greater than output (Note 6)
2.45
5.00
V
SUSD = GND (Note 6)
2.45
2.5
2.55
V
1.231
1.25
1.269
V
Regulation Voltage
FBM to CCM Transconductance
FBM = CCM
80
135
185
µS
FBM Input Leakage Current
FBM = 1.25V
-100
0.01
+100
nA
Idle Mode Trip Level
Current-Sense Amplifier
Transresistance
Step-up mode (SUSD = PVSU)
150
Step-down mode (SUSD = GND)
100
Step-up mode (SUSD = PVSU)
0.25
Step-down mode (SUSD = GND)
0.5
mA
V/A
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
3
MAX1566/MAX1567
ELECTRICAL CHARACTERISTICS (continued)
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 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
CONDITIONS
Step-up mode (SUSD = PVSU)
MIN
TYP
MAX
80
85
90
Step-down mode (SUSD = GND)
95
VLXM = 0 to 3.6V, PVSU = 3.6V
0.1
5
N channel
95
150
P channel
150
250
Step-up mode (SUSD = PVSU)
1.8
2.1
2.4
Step-down mode (SUSD = GND)
0.70
0.8
0.95
Step-up mode (SUSD = PVSU)
20
Step-down mode (SUSD = GND)
20
Soft-Start Interval
UNITS
%
µA
mΩ
A
mA
OSC
cycles
4096
STEP-DOWN DC-TO-DC CONVERTER
Step-Down Output-Voltage Adjust
PVSD must be greater than output (Note 7)
Range
1.25
FBSD Regulation Voltage
1.231
FBSD to CCSD
Transconductance
FBSD = CCSD
80
FBSD Input Leakage Current
FBSD = 1.25V
-100
5.00
V
1.25
1.269
V
135
185
µS
0.1
+100
nA
Idle Mode Trip Level
100
mA
Current-Sense Amplifier
Transresistance
0.5
V/A
LXSD Leakage Current
Switch On-Resistance
VLXSD = 0 to 3.6V, PVSU = 3.6V
0.1
5
N channel
95
150
P channel
150
250
0.77
0.90
P-Channel Current Limit
0.65
N-Channel Turn-Off Current
Soft-Start Interval
µA
mΩ
A
20
mA
2048
OSC
cycles
SDOK Output Low Voltage
0.1mA into SDOK
0.01
0.1
V
SDOK Leakage Current
ONSU = GND
0.01
1
µA
2.45
2.5
2.55
V
80
85
90
%
FB1, FB2 (MAX1566), FB3H
Regulation Voltage
1.231
1.25
1.269
V
FB2 (MAX1567) Inverter
Regulation Voltage
-0.01
0
+0.01
V
AUX1, 2, 3 DC-TO-DC CONTROLLERS
INDL2 Undervoltage
Lockout
Maximum Duty Cycle
4
FB_ = 1V
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
0.19
0.2
0.21
V
AUX1, AUX2 FB to CC
Transconductance
80
135
185
µS
AUX3 FBL or FBH to CC
Transconductance
50
100
150
µS
-100
FB3L Regulation Voltage
FB_ Input Leakage Current
0.1
+100
nA
DL_ Driver Resistance
Output high or low
2.5
7
Ω
DL_ Drive Current
Sourcing or sinking
0.5
A
4096
OSC
cycles
Soft-Start Interval
AUX1OK Output Low Voltage
0.1mA into AUX1OK
0.01
0.1
V
AUX1OK Leakage Current
ONSU = GND
0.01
1
µA
OVERLOAD PROTECTION
Overload Protection Fault Delay
OSC
cycles
100,000
SCF Leakage Current
ONSU = PVSU, FBSU = 1.5V
0.1
1
µA
SCF Output Low Voltage
0.1mA into SCF
0.01
0.1
V
THERMAL-LIMIT PROTECTION
Thermal Shutdown
160
°C
Thermal Hysteresis
20
°C
LOGIC INPUTS (ON_, SUSD)
ONSU Input Low Level
1.1V < PVSU < 1.8V
0.2
1.8V ≤ PVSU < 2.5V
0.4
2.5V ≤ PVSU < 5.5V
0.5
1.1V < PVSU < 1.8V
(PVSU
- 0.2)
1.8V < PVSU < 5.5V
1.6
ONSU Input High Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input Low Level
2.7V < PVSU < 5.5V (Note 8)
ONM, ONSD, ON1, ON2, ON3,
SUSD Input High Level
2.7V < PVSU < 5.5V (Note 8)
V
V
0.5
1.6
V
V
SUSD Input Leakage
0.1
ON_ Impedance to GND
330
1
µA
kΩ
_______________________________________________________________________________________
5
MAX1566/MAX1567
ELECTRICAL CHARACTERISTICS (continued)
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
ELECTRICAL CHARACTERISTICS
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
0.7
GENERAL
Input Voltage Range
(Note 2)
5.5
V
Step-Up Minimum Startup
Voltage (Note 2)
ILOAD < 1mA, TA = +25°C; startup voltage tempco is
-2300ppm/°C (typ) (Note 3)
1.1
V
Shutdown Supply Current into PV
PV = 3.6V
10
µA
Supply Current into PV with StepUp Enabled
ONSU = 3.6V, FBSU = 1.5V
(does not include switching losses)
400
µA
Supply Current into PV with StepUp and Step-Down Enabled
ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
600
µA
Supply Current into PV with StepUp and Main Enabled
ONSU = ONM = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
600
µA
Total Supply Current from PV and
PVSU with Step-Up and One
AUX Enabled
ONSU = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses)
550
µA
REFERENCE
Reference Output Voltage
IREF = 20µA
1.27
V
Reference Load Regulation
10µA < IREF < 200µA
1.23
10
mV
Reference Line Regulation
2.7V < PVSU < 5.5V
5
mV
1.275
V
80
Ω
2.65
V
OSCILLATOR
OSC Discharge Trip Level
Rising edge
OSC Discharge Resistance
OSC = 1.5V, IOSC = 3mA
1.225
STEP-UP DC-TO-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Rising edge or falling edge (Note 4)
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
2.30
3.0
5.5
V
1.231
1.269
V
FBSU to CCSU
Transconductance
FBSU = CCSU
80
185
µS
FBSU Input Leakage Current
FBSU = 1.25V
-100
+100
nA
Step-Up Maximum Duty Cycle
FBSU = 1V
80
90
%
PVSU Leakage Current
VLX = 0V, PVSU = 3.6V
5
µA
LXSU Leakage Current
VLX = VOUT = 3.6V
5
µA
Switch On-Resistance
N channel
150
P channel
250
N-Channel Current Limit
mΩ
1.8
2.4
A
3.0
5.5
V
MAIN DC-TO-DC CONVERTER
Main Step-Up Voltage
Adjust Range
6
SUSD = PVSU
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAX1566/MAX1567
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.)
CONDITIONS
MIN
MAX
UNITS
Main Step-Down Voltage
Adjust Range
PARAMETER
SUSD = GND, PVM must be greater than output (Note 6)
2.45
5.00
V
PVM Undervoltage Lockout in
Step-Down Mode
SUSD = GND (Note 6)
2.45
2.55
V
1.225
1.275
V
Regulation Voltage
FBM to CCM Transconductance
FBM = CCM
80
185
µS
FBM Input Leakage Current
FBM = 1.25V
-100
+100
nA
Maximum Duty Cycle
Step-up mode (SUSD = PVSU),
step-down mode (SUSD = GND) (Note 6)
80
90
%
LXM Leakage Current
VLXM = 0 to 3.6V, PVSU = 3.6V
5
µA
Switch On-Resistance
Main Switch Current Limit
N channel
150
P channel
250
mΩ
Step-up mode (SUSD = PVSU)
1.8
2.4
Step-down mode (SUSD = GND)
0.70
0.95
1.25
5.00
V
1.225
1.275
V
A
STEP-DOWN DC-TO-DC CONVERTER
Step-Down Output Voltage
Adjust Range
PVSD must be greater than output (Note 7)
FBSD Regulation Voltage
FBSD to CCSD
Transconductance
FBSD = CCSD
80
185
µS
FBSD Input Leakage Current
FBSD = 1.25V
-100
+100
nA
LXSD Leakage Current
VLXSD = 0 to 3.6V, PVSU = 3.6V
5
µA
Switch On-Resistance
N channel
150
P channel
250
P-Channel Current Limit
0.65
SDOK Output Low Voltage
0.1mA into SDOK
SDOK Leakage Current
ONSU = GND
0.90
mΩ
A
0.1
V
1
µA
AUX1, 2, 3 DC-TO-DC CONTROLLERS
INDL2 Undervoltage Lockout
2.45
2.55
V
80
90
%
FB1, FB2 (MAX1566), FB3H
Regulation Voltage
1.225
1.275
V
FB2 (MAX1567) Inverter
Regulation Voltage
-0.01
+0.01
V
FB3L Regulation Voltage
0.19
0.21
V
80
185
µS
Maximum Duty Cycle
AUX1, AUX2 FB to CC
Transconductance
FB_ = 1V
_______________________________________________________________________________________
7
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU = VPV = VPVM = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
AUX3 FBL or FBH to CC
Transconductance
FB_ Input Leakage Current
MIN
MAX
UNITS
35
150
µS
-100
+100
nA
7
Ω
0.1
V
DL_ Driver Resistance
Output high or low
AUX1OK Output Low
0.1mA into AUX1OK
AUX1OK Leakage Current
ONSU = GND
1
µA
SCF Leakage Current
ONSU = PVSU, FBSU = 1.5V
1
µA
SCF Output Low Voltage
0.1mA into SCF
0.1
V
1.1V < PVSU < 1.8V
0.2
1.8V ≤ PVSU < 2.5V
0.4
2.5V ≤ PVSU < 5.5V
0.5
OVERLOAD PROTECTION
LOGIC INPUTS (ON_, SUSD)
ONSU Input Low Level
1.1V < PVSU < 1.8V
(PVSU
- 0.2)
1.8V < PVSU < 5.5V
1.6
ONSU Input High Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input Low Level
2.7V < PVSU < 5.5V (Note 8)
ONM, ONSD, ON1, ON2, ON3,
SUSD Input High Level
2.7V < PVSU < 5.5V (Note 8)
V
0.5
1.6
SUSD Input Leakage
V
V
V
1
µA
Note 2: The MAX1566/MAX1567 are powered from the step-up output (PVSU). An internal low-voltage startup oscillator drives the
step-up starting at approximately 0.9V until PVSU reaches approximately 2.5V. When PVSU reaches 2.5V, the main control
circuitry takes over. Once the step-up is up and running, it can maintain operation with very low input voltages; however,
output current is limited.
Note 3: Since the device is powered from PVSU, a Schottky rectifier, connected from the battery to PVSU, is required for low-voltage
startup.
Note 4: The step-up regulator is in startup mode until this voltage is reached. Do not apply full load current during startup. A powerOK output can be used with an external PFET to gate the load until the step-up is in regulation. See the AUX1OK, SDOK,
and SCF Connections section.
Note 5: The step-up current limit in startup refers to the LXSU switch current limit, not the output current limit.
Note 6: If the main converter is configured as a step-up (SUSD = PVSU), the P-channel synchronous rectifier is disabled until the
2.5V normal operation threshold has been exceeded. If the main converter is configured as a step-down (SUSD = GND), all
step-down operation is locked out until the normal operation threshold has been exceeded. When the main is configured as
a step-down, operation in dropout (100% duty cycle) can only be maintained for 100,000 OSC cycles before the output is
considered faulted, triggering global shutdown.
Note 7: Operation in dropout (100% duty cycle) can only be maintained for 100,000 OSC cycles before the output is considered
faulted, triggering global shutdown.
Note 8: ONM, ONSD, ON1, ON2, and ON3 are disabled until 1024 OSC cycles after PVSU reaches 2.7V.
8
_______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAIN (STEP-UP) EFFICIENCY
vs. LOAD CURRENT
90
80
70
EFFICIENCY (%)
VIN = 4.5V
VIN = 3.8V
VIN = 3.2V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
50
40
50
70
40
50
40
30
20
20
20
10
10
VSU = 5V
0
10
100
0
0
1
1000
10
100
1000
LOAD CURRENT (mA)
OUTPUT CURRENT (mA)
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
BOOST-BUCK EFFICIENCY (SU + SD)
vs. LOAD CURRENT
80
60
50
80
40
30
SD = 1.8V
SD INPUT
CONNECTED
TO BATT
20
10
70
VIN = 3.2V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
60
50
40
20
100
1000
VM = 3.3V
IOUTVM = 200mA
90
SU = 5V, IOUTSU = 500mA
85
AUX2 = 8V, IOUT2 = 100mA
80
SU + SD, IOUT3 = 350mA
70
1
10
100
1000
1.5
2.5
3.5
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
AUX EFFICIENCY vs. LOAD CURRENT
AUX EFFICIENCY vs. LOAD CURRENT
MAX1567 AUX2 EFFICIENCY
vs. LOAD CURRENT
100
MAX1566/67 toc07
90
80
70
30
80
70
VIN = 4.5V
VIN = 3.8V
VIN = 3.0V
VIN = 2.0V
VIN = 1.5V
70
60
20
VOUT_AUX = 5V
0
100
LOAD CURRENT (mA)
1000
50
40
20
40
10
VIN = 2.5V
VIN = 3.0V
VIN = 3.8V
VIN = 4.5V
60
30
50
10
90
EFFICIENCY (%)
40
EFFICIENCY (%)
50
90
4.5
100
80
VIN = 4.5V
VIN = 3.8V
VIN = 3.0V
VIN = 2.0V
VIN = 1.5V
60
1
95
75
VSU = 3.3V
SD = 1.8V
10
10
1000
30
0
1
100
EFFICIENCY vs. INPUT VOLTAGE
90
EFFICIENCY (%)
VIN = 2.5V
VIN = 3.0V
VIN = 3.8V
VIN = 4.5V
70
10
100
EFFICIENCY (%)
90
1
OUTPUT CURRENT (mA)
100
MAX1566/67 toc04
100
VM = 3.3V
VSU = 5V
10
VM = 3.3V
MAX1566/67 toc05
1
VIN = 4.5V
VIN = 3.8V
VIN = 3.2V
VIN = 2.5V
60
30
30
EFFICIENCY (%)
60
MAX1566/67 toc09
60
80
MAX1566/67 toc08
EFFICIENCY (%)
70
EFFICIENCY (%)
VIN = 3.2V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
90
MAX1566/67 toc06
80
EFFICIENCY (%)
90
100
MAX1566/67 toc02
100
MAX1566/67 toc01
100
BOOST-BUCK EFFICIENCY
(SU + MAIN AS STEP-DOWN) vs. LOAD CURRENT
MAX1566/67 toc03
STEP-UP EFFICIENCY vs. LOAD CURRENT
VOUT_AUX = 15V
30
10
VAUX2 = -7.5V
0
1
10
LOAD CURRENT (mA)
100
1
10
100
1000
LOAD CURRENT (mA)
_______________________________________________________________________________________
9
MAX1566/MAX1567
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (OUTSU)
VSU = 5.0V
+ VSD = 1.8V
1.5
1.0
VSU = 5.0V ONLY
2.0
1.5
1.0
0.5
2
3
4
200
400
600
800
1000
LOAD CURRENT (mA)
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
OSCILLATOR FREQUENCY vs. ROSC
MAX1566/67 toc13
1.249
1.248
1.247
1.246
1.245
OSCILLATOR FREQUENCY (kHz)
INPUT VOLTAGE (V)
1.250
800
0
50
100
150
200
250
400
200
1
10
AUX_ MAXIMUM DUTY CYCLE
vs. FREQUENCY
100
1000
-50
STEP-UP STARTUP WAVEFORMS
87
86
MAX1566/67 toc16
WHEN THIS DUTY CYCLE IS
EXCEEDED FOR 100,000 CLOCK CYCLES,
THE MAX1566/MAX1567 SHUT DOWN
85
84
COSC = 100pF
83
75
100
-25
0
25
50
75
100
STEP-UP STARTUP WAVEFORMS
MAX1566/67 toc18
ONSU
2V/div
ONSU
2V/div
0V
0V
VSU = 3.3V
5V/div
0V
0V
0A
IOUT_SU
100mA/div
0A
0A
IIN
1A/div
0A
VSU = 5V
5V/div
IOUT_SU
100mA/div
82
81
IIN
1A/div
VIN = 2V, VSU = 3.3V
80
0
200
400
600
800
1000
1200
100µs/div
VIN = 3.0V, VSU = 5V
100µs/div
FREQUENCY (kHz)
10
50
TEMPERATURE (°C)
MAX1566/67 toc17
88
25
315
314
313
312
311
310
309
308
307
306
305
304
303
302
301
300
ROSC (kΩ)
REFERENCE LOAD CURRENT (µA)
0
SWITCHING FREQUENCY vs. TEMPERATURE
600
300
-25
TEMPERATURE (°C)
COSC = 470pF
COSC = 330pF
COSC = 220pF
COSC = 100pF
COSC = 47pF
1000
-50
0
1.244
1.246
1.243
0
5
1.248
SWITCHING FREQUENCY (kHz)
1
MAX1566/7 toc14
0
1.251
WITH NO SCHOTTKY RECTIFER
FROM BATT TO PVSU
0.0
0.5
REFERENCE VOLTAGE (V)
2.5
MAX1566/67 toc15
2.0
3.0
REFERENCE VOLTAGE (V)
VSU = 5.0V
+ VM = 3.3V
1.254
MAX1566/67 toc11
MINIMUM STARTUP VOLTAGE (V)
INPUT CURRENT (mA)
2.5
REFERENCE VOLTAGE vs. TEMPERATURE
3.5
MAX1566/67 toc10
3.0
MAX1566/67 toc12
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAXIMUM DUTY CYCLE (%)
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAIN (STEP-DOWN MODE) AND STEP-DOWN
STARTUP WAVEFORMS
MAIN (STEP-UP MODE) AND STEP-DOWN
STARTUP WAVEFORMS
MAX1566/67 toc20
MAX1566/67 toc19
ONSU =
ONSD =
ONM
2V/div
0V
VSU
5V/div
VSD
1V/div
0V
VM (MAIN
AS BOOST)
2V/div
0V
0V
ONSU =
ONM =
ONSD
2V/div
VSU
2V/div
0V
0V
VSD
2V/div
0V
VM
2V/div
MAIN AS A
STEP-DOWN
0V
VIN = 3.0V
2ms/div
2ms/div
MAIN (STEP-UP MODE)
LOAD TRANSIENT RESPONSE
STEP-UP LOAD TRANSIENT RESPONSE
MAX1566/67 toc21
0V
MAX1566/67 toc22
VSU
AC-COUPLED
100mV/div
0A
VIN = 3.0V, VSU = 5V
ISU
200mA/div
0V
0A
1ms/div
VM
AC-COUPLED
100mV/div
(MAIN AS STEP-UP)
VIN = 3.0V, VM = 3.3V
1ms/div
MAIN (STEP-DOWN MODE)
LOAD TRANSIENT RESPONSE
STEP-DOWN TRANSIENT RESPONSE
MAX1566/67 toc23
MAX1566/67 toc24
VM
AC-COUPLED
200mV/div
0V
VSD
AC-COUPLED
20mV/div
0V
IM
200mA/div
0A
ISD
100mA/div
0A
(MAIN AS STEP-DOWN FROM SU)
VIN = 3.0V, VM = 3.3V
1ms/div
IM
100mA/div
VIN = 3.0V, VSD = 1.8V
1ms/div
______________________________________________________________________________________
11
MAX1566/MAX1567
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAX1566/MAX1567
Pin Description
PIN
FUNCTION
1
FB3H
AUX3 Controller Voltage Feedback Input. Connect a resistive voltage-divider from the step-up
converter output to FBH to set the output voltage. The feedback threshold is 1.25V. This pin is high
impedance in shutdown. FB3H can provide conventional voltage feedback (with FB3L grounded) or
open-LED protection in white LED drive circuits.
2
CC1
AUX1 Controller Compensation Node. Connect a series resistor-capacitor from this pin to GND to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the AUX Compensation section.
3
FB1
AUX1 Controller Feedback Input. The feedback threshold is 1.25V. This pin is high impedance in
shutdown.
4
ON1
AUX1 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles
after the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.
5
PGSD
Power Ground. Connect all PG_ pins to GND with short wide traces as close to the IC as possible.
6
LXSD
Step-Down Converter Switching Node. Connect to the inductor of the step-down converter. LXSD is
high impedance in shutdown.
7
PVSD
Step-Down Converter Input. Bypass to GND with a 1µF ceramic capacitor. The step-down efficiency
is measured from this input.
8
ONSD
Step-Down Converter On/Off Control Input. Logic high = on; however, turn-on is locked out until 1024
OSC cycles after the step-up has reached regulation. This pin has an internal 330kΩ pulldown
resistance to GND.
9
FBSD
Step-Down Converter Feedback Input. The feedback threshold is 1.25V. This pin is high impedance
in shutdown.
10
CCSD
Step-Down Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND
for compensating the converter control loop. This pin is actively driven to GND in shutdown, overload,
and thermal limit. See the Step-Down Compensation section.
SUSD
Configures the Main Converter as a Step-Up or a Step-Down. This function must be hardwired. Onthe-fly changes are not allowed. With SUSD connected to PV, the main is configured as a step-up
and PVM is the converter output. With SUSD connected to GND, the main is configured as a stepdown and PVM is the power input.
12
CCM
Main Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND for
compensating the converter control loop. This pin is actively driven to GND in shutdown, overload,
and thermal limit. See the Step-Up Compensation section when the main is used in step-up mode
and the Step-Down Compensation section when the main is used in step-down mode.
13
FBM
Main Converter Feedback Input. The feedback threshold is 1.25V. This pin is high impedance in
shutdown. The main output voltage must not be set higher than the step-up output.
14
ONM
On/Off Control for the Main DC-to-DC Converter. Logic high = on; however, turn-on is locked out until
1024 OSC cycles after the step-up has reached regulation. This pin has an internal 330kΩ pulldown
resistance to GND. SUSD pin configures the main converter as a step-up or step-down.
15
REF
Reference Output. Bypass REF to GND with a 0.1µF or greater capacitor. The maximum-allowed REF
load is 200µA. REF is actively pulled to GND when the step-up is shut down (all converters turn off).
11
12
NAME
______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
PIN
NAME
FUNCTION
16
CCSU
Step-Up Converter Compensation Node. Connect a series resistor-capacitor from this pin to GND for
compensating the converter control loop. This pin is actively driven to GND in shutdown, overload,
and thermal limit. See the Step-Up Compensation section.
17
FBSU
Step-Up Converter Feedback Input. The feedback threshold is 1.25V. This pin is high impedance in
shutdown.
18
ONSU
Step-Up Converter On/Off Control. Logic high = on. All other ON_ pins are locked out until 1024 OSC
cycles after the step-up DC-to-DC converter output has reached its final value. This pin has an
internal 330kΩ pulldown resistance to GND.
19
SCF
Open-Drain, Active-Low, Short-Circuit Flag Output. SCF goes open when overload protection occurs
and during startup. SCF can drive high-side PFET switches connected to one or more outputs to
completely disconnect the load when the channel turns off in response to a logic command or an
overload. See the Status Outputs (SDOK, AUX1OK, SCF) section.
20
AUX1OK
21
SDOK
22
OSC
Oscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to
PVSU (or other DC voltage) to set the oscillator frequency between 100kHz and 1MHz. See the
Setting the Switching Frequency section. This pin is high impedance in shutdown.
23
PGSU
Power Ground. Connect all PG_ pins to GND with short wide traces as close to the IC as possible.
24
LXSU
Step-Up Converter Switching Node. Connect to the inductor of the step-up converter. LXSU is high
impedance in shutdown.
25
PVSU
Power Output of the Step-Up DC-to-DC Converter. PVSU can also power other converter channels.
Connect PVSU and PV together.
26
PGM
Power Ground. Connect all PG_ pins to GND with short wide traces as close to the IC as possible.
27
LXM
Main Converter Switching Node. Connect to the inductor of the main converter (can be configured as
a step-up or step-down by SUSD). LXM is high impedance in shutdown.
28
PVM
When SUSD = PVSU, the main converter is configured as a step-up and PVM is the main output.
When SUSD = GND, the main is configured as a step-down and PVM is the power input.
29
ON2
AUX2 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles
after the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.
30
CC2
AUX2 Controller Compensation Node. Connect a series resistor-capacitor from this pin to GND to
compensate the converter control loop. This pin is actively driven to GND in shutdown, overload, and
thermal limit. See the AUX Compensation section.
Open-Drain, Active-Low, Power-OK Signal for AUX1 Controller. AUX1OK goes low when the AUX1
controller has successfully completed soft-start. AUX1OK goes high impedance in shutdown,
overload, and thermal limit.
Open-Drain, Active-Low, Power-OK Signal for Step-Down Converter. SDOK goes low when the stepdown has successfully completed soft-start. SDOK goes high impedance in shutdown, overload, and
thermal limit.
______________________________________________________________________________________
13
MAX1566/MAX1567
Pin Description (continued)
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
MAX1566/MAX1567
Pin Description (continued)
PIN
31
FB2
FUNCTION
AUX2 Controller
Feedback Input. This
pin is high impedance
in shutdown.
MAX1566 (AUX2 is configured as a boost): FB2 feedback threshold is
1.25V.
MAX1567 (AUX2 is configured as an inverter): FB2 feedback threshold is
0V.
MAX1566 (AUX2 is configured as a boost): connect INDL2 to PVSU for
Voltage Input for AUX2
optimum N-channel gate drive.
Gate Driver. The voltage
MAX1567 (AUX2 is configured as an inverter): connect INDL2 to the
at INDL2 sets the high
external P-channel MOSFET source to ensure the P channel is completely
gate-drive voltage.
off when DL2 swings high.
32
INDL2
33
GND
Analog Ground. Connect to all PG_ pins as close to the IC as possible.
DL2
AUX2 Controller GateDrive Output. DL2
drives between INDL2
and GND.
34
The MAX1566 configures DL2 to drive an N-channel FET in a boost
configuration. DL2 is driven low in shutdown, overload, and thermal limit.
The MAX1567 configures DL2 to drive a PFET in an inverter configuration.
DL2 is driven high in shutdown, overload, and thermal limit.
35
DL3
AUX3 Controller Gate-Drive Output. Connect to the gate of an N-channel MOSFET. DL3 drives
between GND and PVSU and supplies up to 500mA. This pin is actively driven to GND in shutdown,
overload, and thermal limit.
36
DL1
AUX1 Controller Gate-Drive Output. Connect to the gate of an N-channel MOSFET. DL1 drives
between GND and PVSU and supplies up to 500mA. This pin is actively driven to GND in shutdown,
overload, and thermal limit.
37
PV
38
CC3
AUX3 Controller Compensation Node. Connect a series resistor-capacitor from this pin to GND for
compensating the converter control loop. This pin is actively driven to GND in shutdown, overload,
and thermal limit. See the AUX Compensation section.
39
FB3L
AUX3 Controller Current-Feedback Input. Connect a resistor from FB3L to GND to set LED current in
LED boost-drive circuits. The feedback threshold is 0.2V. Connect this pin to GND if using only the
FB3H feedback. This pin is high impedance in shutdown.
40
ON3
AUX3 Controller On/Off Input. Logic high = on; however, turn-on is locked out until 1024 OSC cycles
after the step-up has reached regulation. This pin has an internal 330kΩ pulldown resistance to GND.
EP
Exposed Metal Pad. This pad is connected to ground. Note this internal connection is a soft-connect,
meaning there is no internal metal or bond wire physically connecting the exposed pad to the GND
pin. The connection is through the silicon substrate of the die and then through a conductive epoxy.
Connecting the exposed pad to ground does not remove the requirement for a good ground
connection to the appropriate pins.
Pad
14
NAME
IC Power Input. Connect PVSU and PV together.
______________________________________________________________________________________
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
The MAX1566/MAX1567 include the following blocks to
build a multiple-output digital camera power-supply
system. Both devices can accept inputs from a variety
of sources including 1-cell Li+ batteries, 2-cell alkaline
or NiMH batteries, and even systems designed to
accept both battery types. The MAX1566/
MAX1567 include six DC-to-DC converter channels to
generate all required voltages:
• Step-up DC-to-DC converter (_SU pins) with on-chip
power FETS
• Main DC-to-DC converter (_M pins) with on-chip
power FETS that can be configured as either a stepup or step-down DC-to-DC converter
• Step-down core DC-to-DC converter with on-chip
MOSFETs (_SD pins)
• AUX1 DC-to-DC controller for boost and flyback
converters
• AUX2 DC-to-DC controller for boost and flyback
converters (MAX1566)
• AUX2 DC-to-DC controller for inverting DC-to-DC
converters (MAX1567)
• AUX3 DC-to-DC controller for white LED as well as
conventional boost applications; includes open LED
overvoltage protection
Step-Up DC-to-DC Converter
The step-up DC-to-DC switching converter typically is
used to generate a 5V output voltage from a 1.5V to
4.5V battery input, but any voltage from VIN to 5V can
be set. An internal NFET switch and external synchronous rectifier allow conversion efficiencies as high as
95%. Under moderate to heavy loading, the converter
operates in a low-noise PWM mode with constant
frequency and modulated pulse width. Switching
harmonics generated by fixed-frequency operation are
consistent and easily filtered. Efficiency is enhanced
under light (
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