Rainbow Electronics MAX1567 User Manual
General Description
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:
• Step-up DC-to-DC converter with on-chip power FETs
• Main DC-to-DC converter with on-chip FETs, configurable 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 (typically 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
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
Typical Operating Circuit
PART TEMP RANGE PIN-PACKAGE
MAX1566ETL -40°C to +85°C
MAX1567ETL -40°C to +85°C
40 Thin QFN
6mm x 6mm
40 Thin QFN
6mm x 6mm
AUX2
FUNCTION
Step-up
controller
Inverting
controller
Li+ OR 2AA
BATTERY INPUT
ONSU
ONM
ONSD
ON3(LED)
ON1
ON2
MAX1567
STEP-UP
MAIN DC-TO-DC
STEP-DN
AUX3
AUX1
AUX2
SYSTEM 5V
3.3V LOGIC
1.8V CORE
CCD/LCD + 15V
CCD - 7.5V
LEDS
TOP VIEW
FB3H
CC1
FB1
ON1
PGSD
LXSD
PVSD
ONSD
FBSD
CCSD
ON3
40 36373839
1
2
3
4
5
6
7
8
9
10
11
12
SUSD
FB3L
CC3
PV
DL1
DL3
DL2
GND
INDL2
3435
33
MAX1566/MAX1567
18
CCM
15
14
13
REF
FBM
ONM
CCSU
FBSU
19 2016 17
ONSU
SCF
FB2
3132
30
29
28
27
26
25
24
23
22
21
AUX1OK
6mm x 6mm
THIN QFN
CC2
ON2
PVM
LXM
PGM
PVSU
LXSU
PGSU
OSC
SDOK
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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
ELECTRICAL CHARACTERISTICS
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
Input Voltage Range (Note 2) 0.7 5.5 V
Step-Up Minimum Startup
Voltage (Note 2)
I
< 1mA, TA = +25°C; startup voltage tempco is
LOAD
-2300ppm/°C (typ) (Note 3)
Shutdown Supply Current into PV PV = 3.6V 0.1 10 µA
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
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)
REFERENCE
Reference Output Voltage I
Reference Load Regulation 10µA < I
= 20µA 1.23 1.25 1.27 V
REF
< 200µA 4.5 10 mV
REF
Reference Line Regulation 2.7 < PVSU < 5.5V 1.3 5 mV
OSCILLATOR
OSC Discharge Trip Level Rising edge 1.225 1.25 1.275 V
OSC Discharge Resistance OSC = 1.5V, I
= 3mA 52 80 Ω
OSC
OSC Discharge Pulse Width 150 ns
OSC Frequency R
= 47kΩ, C
OSC
= 100pF 500 kHz
OSC
0.9 1.1 V
300 450 µA
450 700 µA
450 700 µA
400 650 µA
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
Idle Mode is a trademark of Maxim Integrated Products, Inc.
PARAMETER CONDITIONS MIN TYP MAX UNITS
STEP-UP DC-TO-DC
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Startup-to-Normal
Operating Threshold Hysteresis
Rising edge or falling edge (Note 4) 2.30 2.5 2.65 V
80 mV
Step-Up Voltage Adjust Range 3.0 5.5 V
Start Delay of ONSD, ONM,
ON1, ON2, and ON3 after
SU in Regulation
1024
OSC
cycles
FBSU Regulation Voltage 1.231 1.25 1.269 V
FBS U to C C S U Tr anscond uctance FBSU = CCSU 80 135 185 µS
FBSU Input Leakage Current FBSU = 1.25V -100 0.01 +100 nA
Idle Mode
Current-Sense Amplifier
Transresistance
TM
Trip Level 150 mA
0.275 V/A
Step-Up Maximum Duty Cycle FBSU = 1V 80 85 90 %
PVSU Leakage Current V
LXSU Leakage Current V
Switch On-Resistance
= 0V, PVSU = 3.6V 0.1 5 µA
LX
LX
= V
OUT
= 3.6V
0.1 5 µA
N channel 95 150
P channel 150 250
mΩ
N-Channel Current Limit 1.8 2.1 2.4 A
P-Channel Turn-Off Current 20 mA
Startup Current Limit PVSU = 1.8V (Note 5) 450 mA
Startup t
OFF
PVSU = 1.8V 700 ns
Startup Frequency PVSU = 1.8V 200 kHz
MAIN DC-TO-DC CONVERTER
Main Step-Up Voltage
Adjust Range
Main Step-Down Voltage
Adjust Range
PVM Undervoltage Lockout in
Step-Down Mode
SUSD = PVSU 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
Regulation Voltage 1.231 1.25 1.269 V
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
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle (Note 6)
LXM Leakage Current V
Switch On-Resistance
Main Switch Current Limit
Synchronous Rectifier
Turn-Off Current
Soft-Start Interval 4096
STEP-DOWN DC-TO-DC CONVERTER
Step-Down Output-Voltage Adjust
Range
FBSD Regulation Voltage 1.231 1.25 1.269 V
FBSD to CCSD
Transconductance
FBSD Input Leakage Current FBSD = 1.25V -100 0.1 +100 nA
Idle Mode Trip Level 100 mA
Current-Sense Amplifier
Transresistance
LXSD Leakage Current V
Switch On-Resistance
P-Channel Current Limit 0.65 0.77 0.90 A
N-Channel Turn-Off Current 20 mA
Soft-Start Interval 2048
SDOK Output Low Voltage 0.1mA into SDOK 0.01 0.1 V
SDOK Leakage Current ONSU = GND 0.01 1 µA
AUX1, 2, 3 DC-TO-DC CONTROLLERS
INDL2 Undervoltage
Lockout
Maximum Duty Cycle FB_ = 1V 80 85 90 %
FB1, FB2 (MAX1566), FB3H
Regulation Voltage
FB2 (MAX1567) Inverter
Regulation Voltage
Step-up mode (SUSD = PVSU) 80 85 90
Step-down mode (SUSD = GND) 95
= 0 to 3.6V, PVSU = 3.6V 0.1 5 µA
LXM
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
PVSD must be greater than output (Note 7) 1.25 5.00 V
FBSD = CCSD 80 135 185 µS
0.5 V/A
= 0 to 3.6V, PVSU = 3.6V 0.1 5 µA
LXSD
N channel 95 150
P channel 150 250
2.45 2.5 2.55 V
1.231 1.25 1.269 V
-0.01 0 +0.01 V
cycles
cycles
%
mΩ
A
mA
OSC
mΩ
OSC
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FB3L Regulation Voltage 0.19 0.2 0.21 V
AUX1, AUX2 FB to CC
Transconductance
AUX3 FBL or FBH to CC
Transconductance
80 135 185 µS
50 100 150 µS
FB_ Input Leakage Current -100 0.1 +100 nA
DL_ Driver Resistance Output high or low 2.5 7 Ω
DL_ Drive Current Sourcing or sinking 0.5 A
OSC
Soft-Start Interval 4096
cycles
AUX1OK Output Low Voltage 0.1mA into AUX1OK 0.01 0.1 V
AUX1OK Leakage Current ONSU = GND 0.01 1 µA
OVERLOAD PROTECTION
OSC
Overload Protection Fault Delay 100,000
cycles
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
ONSU Input High Level
1.1V < PVSU < 1.8V 0.2
1.8V < PVSU < 5.5V 0.4
1.1V < PVSU < 1.8V
(PVSU
- 0.2)
V
V
1.8V < PVSU < 5.5V 1.6
ONM, ONSD, ON1, ON2, ON3,
SUSD Input Low Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input High Level
2.7V < PVSU < 5.5V (Note 8) 0.4 V
2.7V < PVSU < 5.5V (Note 8) 1.6 V
SUSD Input Leakage 0.1 1 µA
ON_ Impedance to GND 330 kΩ
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= -40°C to +85°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN MAX UNITS
GENERAL
Input Voltage Range (Note 2) 0.7 5.5 V
Step-Up Minimum Startup
Voltage (Note 2)
Shutdown Supply Current into PV PV = 3.6V 10 µA
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 I
Reference Load Regulation 10µA < I
Reference Line Regulation 2.7V < PVSU < 5.5V 5 mV
OSCILLATOR
OSC Discharge Trip Level Rising edge 1.225 1.275 V
OSC Discharge Resistance OSC = 1.5V, I
STEP-UP DC-TO-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Voltage Adjust Range 3.0 5.5 V
FBSU Regulation Voltage 1.231 1.269 V
FBSU to CCSU
Transconductance
FBSU Input Leakage Current FBSU = 1.25V -100 +100 nA
Step-Up Maximum Duty Cycle FBSU = 1V 80 90 %
PVSU Leakage Current V
LXSU Leakage Current V
Switch On-Resistance
N-Channel Current Limit 1.8 2.4 A
MAIN DC-TO-DC CONVERTER
Main Step-Up Voltage
Adjust Range
I
< 1mA, TA = +25°C; startup voltage tempco is
LOAD
-2300ppm/°C (typ) (Note 3)
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)
= 20µA 1.23 1.27 V
REF
< 200µA 10 mV
REF
= 3mA 80 Ω
OSC
1.1 V
400 µA
600 µA
600 µA
550 µA
Rising edge or falling edge (Note 4) 2.30 2.65 V
FBSU = CCSU 80 185 µS
= 0V, PVSU = 3.6V 5 µA
LX
= V
LX
= 3.6V 5 µA
OUT
N channel 150
P channel 250
SUSD = PVSU 3.0 5.5 V
mΩ
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= -40°C to +85°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN MAX UNITS
Main Step-Down Voltage
Adjust Range
PVM Undervoltage Lockout in
Step-Down Mode
SUSD = GND, PVM must be greater than output (Note 6) 2.45 5.00 V
SUSD = GND (Note 6) 2.45 2.55 V
Regulation Voltage 1.225 1.275 V
FBM to CCM Transconductance FBM = CCM 80 185 µS
FBM Input Leakage Current FBM = 1.25V -100 +100 nA
Maximum Duty Cycle
LXM Leakage Current V
Switch On-Resistance
Main Switch Current Limit
Step-up mode (SUSD = PVSU),
step-down mode (SUSD = GND) (Note 6)
= 0 to 3.6V, PVSU = 3.6V 5 µA
LXM
80 90 %
N channel 150
P channel 250
Step-up mode (SUSD = PVSU) 1.8 2.4
Step-down mode (SUSD = GND) 0.70 0.95
mΩ
A
STEP-DOWN DC-TO-DC CONVERTER
Step-Down Output Voltage
Adjust Range
PVSD must be greater than output (Note 7) 1.25 5.00 V
FBSD Regulation Voltage 1.225 1.275 V
FBSD to CCSD
Transconductance
FBSD = CCSD 80 185 µS
FBSD Input Leakage Current FBSD = 1.25V -100 +100 nA
LXSD Leakage Current V
Switch On-Resistance
= 0 to 3.6V, PVSU = 3.6V 5 µA
LXSD
N channel 150
P channel 250
mΩ
P-Channel Current Limit 0.65 0.90 A
SDOK Output Low Voltage 0.1mA into SDOK 0.1 V
SDOK Leakage Current ONSU = GND 1 µA
AUX1, 2, 3 DC-TO-DC CONTROLLERS
INDL2 Undervoltage Lockout 2.45 2.55 V
Maximum Duty Cycle FB_ = 1V 80 90 %
FB1, FB2 (MAX1566), FB3H
Regulation Voltage
FB2 (MAX1567) Inverter
Regulation Voltage
1.225 1.275 V
-0.01 +0.01 V
FB3L Regulation Voltage 0.19 0.21 V
AUX1, AUX2 FB to CC
Transconductance
80 185 µS
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
8 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= VPV= V
PVM
= V
PVSD
= V
INDL2
= 3.6V, TA= -40°C to +85°C, unless otherwise noted.)
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 power-
OK 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.
PARAMETER CONDITIONS MIN MAX UNITS
AUX3 FBL or FBH to CC
Transconductance
FB_ Input Leakage Current -100 +100 nA
DL_ Driver Resistance Output high or low 7 Ω
AUX1OK Output Low 0.1mA into AUX1OK 0.1 V
AUX1OK Leakage Current ONSU = GND 1 µA
OVERLOAD PROTECTION
SCF Leakage Current ONSU = PVSU, FBSU = 1.5V 1 µA
SCF Output Low Voltage 0.1mA into SCF 0.1 V
LOGIC INPUTS (ON_, SUSD)
ONSU Input Low Level
ONSU Input High Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input Low Level
ONM, ONSD, ON1, ON2, ON3,
SUSD Input High Level
SUSD Input Leakage 1 µA
35 150 µS
1.1V < PVSU < 1.8V 0.2
1.8V < PVSU < 5.5V 0.4
1.1V < PVSU < 1.8V
(PVSU
- 0.2)
1.8V < PVSU < 5.5V 1.6
2.7V < PVSU < 5.5V (Note 8) 0.4 V
2.7V < PVSU < 5.5V (Note 8) 1.6 V
v
V
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
_______________________________________________________________________________________ 9
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
STEP-UP EFFICIENCY vs. LOAD CURRENT
100
90
80
70
60
50
40
EFFICIENCY (%)
30
VIN = 4.5V
= 3.8V
V
IN
= 3.2V
V
IN
= 2.5V
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
20
10
0
1100010010
VSU = 5V
LOAD CURRENT (mA)
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
100
90
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
1 100010010
VIN = 2.5V
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
V
IN
LOAD CURRENT (mA)
SD = 1.8V
SD INPUT
CONNECTED
TO BATT
MAX1566/67 toc01
MAX1566/67 toc04
EFFICIENCY (%)
MAIN (STEP-UP) EFFICIENCY
vs. LOAD CURRENT
100
90
80
70
60
50
40
EFFICIENCY (%)
30
VIN = 3.2V
= 2.5V
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
20
10
0
1 100010010
OUTPUT CURRENT (mA)
BOOST-BUCK EFFICIENCY (SU + SD)
vs. LOAD CURRENT
100
90
80
70
60
50
40
30
20
10
1100010010
LOAD CURRENT (mA)
BOOST-BUCK EFFICIENCY
VIN = 4.5V
= 3.8V
V
IN
= 3.2V
V
IN
= 2.5V
V
IN
VM = 3.3V
= 5V
V
0
1 100010010
SU
OUTPUT CURRENT (mA)
EFFICIENCY vs. INPUT VOLTAGE
VM = 3.3V
= 200mA
I
SU = 5V, I
AUX2 = 8V, I
OUTVM
OUTSU
OUT2
= 500mA
= 100mA
95
90
85
80
SU + SD, I
OUT3
= 350mA
75
70
1.5 2.5 3.5 4.5
INPUT VOLTAGE (V)
VIN = 3.2V
= 2.5V
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
VM = 3.3V
VSU = 3.3V
SD = 1.8V
(SU + MAIN AS STEP-DOWN) vs. LOAD CURRENT
100
90
80
MAX1566/67 toc02
70
60
50
40
EFFICIENCY (%)
30
20
10
100
MAX1566/67 toc05
EFFICIENCY (%)
MAX1566/67 toc03
MAX1566/67 toc06
AUX EFFICIENCY vs. LOAD CURRENT
90
80
70
60
50
40
EFFICIENCY (%)
30
VIN = 4.5V
= 3.8V
V
IN
= 3.0V
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
20
10
0
1 100010010
LOAD CURRENT (mA)
V
OUT_AUX
= 5V
MAX1566/67 toc07
AUX EFFICIENCY vs. LOAD CURRENT
100
90
80
70
60
EFFICIENCY (%)
50
VIN = 4.5V
= 3.8V
V
IN
= 3.0V
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
40
V
30
110100
OUT_AUX
LOAD CURRENT (mA)
MAX1566/67 toc08
EFFICIENCY (%)
= 15V
100
90
80
70
60
50
40
30
20
10
0
1 100010010
MAX1567 AUX2 EFFICIENCY
vs. LOAD CURRENT
VIN = 2.5V
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
V
IN
V
= -7.5V
AUX2
LOAD CURRENT (mA)
MAX1566/67 toc09
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
0.5
1.0
1.5
2.0
2.5
3.0
021345
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAX1566/67 toc10
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
VSU = 5.0V ONLY
VSU = 5.0V
+ V
SD
= 1.8V
VSU = 5.0V
+ V
M
= 3.3V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0600200 400 800 1000
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (OUTSU)
MAX1566/67 toc11
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
WITH NO SCHOTTKY RECTIFER
FROM BATT TO PVSU
1.251
1.248
1.246
1.243
-50 25-25 0 50 75 100
REFERENCE VOLTAGE vs. TEMPERATURE
MAX1566/67 toc12
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
1.254
1.250
1.249
1.248
1.247
1.246
1.245
1.244
0 100 200 30050 150 250
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX1566/67 toc13
REFERENCE LOAD CURRENT (µA)
REFERENCE VOLTAGE (V)
0
1100010010
OSCILLATOR FREQUENCY vs. R
OSC
400
800
600
200
1000
MAX1566/7 toc14
R
OSC
(kΩ)
OSCILLATOR FREQUENCY (kHz)
C
OSC
= 470pF
C
OSC
= 330pF
C
OSC
= 220pF
C
OSC
= 100pF
C
OSC
= 47pF
315
314
313
312
311
310
309
308
307
306
305
304
303
302
301
300
-50 25-25 0 50 75 100
SWITCHING FREQUENCY vs. TEMPERATURE
MAX1566/67 toc15
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
88
87
86
85
84
83
82
81
80
0600200 400 800 1000 1200
AUX_ MAXIMUM DUTY CYCLE
vs. FREQUENCY
MAX1566/67 toc16
FREQUENCY (kHz)
MAXIMUM DUTY CYCLE (%)
WHEN THIS DUTY CYCLE IS
EXCEEDED FOR 100,000 CLOCK CYCLES,
THE MAX1566/MAX1567 SHUT DOWN
C
OSC
= 100pF
STEP-UP STARTUP WAVEFORMS
MAX1566/67 toc17
100µs/div
I
IN
1A/div
ONSU
2V/div
V
SU
= 3.3V
5V/div
I
OUT_SU
100mA/div
VIN = 2V, VSU = 3.3V
0V
0V
0A
0A
STEP-UP STARTUP WAVEFORMS
MAX1566/67 toc18
100µs/div
I
IN
1A/div
ONSU
2V/div
V
SU
= 5V
5V/div
I
OUT_SU
100mA/div
VIN = 3.0V, VSU = 5V
0V
0V
0A
0A
MAX1566/MAX1567
Six-Channel, High-Efficiency, Digital
Camera Power Supplies
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAIN (STEP-UP MODE) AND STEP-DOWN
STARTUP WAVEFORMS
0V
0V
0V
0V
2ms/div
STEP-UP LOAD TRANSIENT RESPONSE
0V
MAX1566/67 toc19
VIN = 3.0V
MAX1566/67 toc21
=
ONSU
=
ONSD
ONM
2V/div
V
SU
5V/div
V
SD
1V/div
VM (MAIN
AS BOOST)
2V/div
V
SU
AC-COUPLED
100mV/div
MAIN (STEP-DOWN MODE) AND STEP-DOWN
0V
0V
0V
0V
0V
STARTUP WAVEFORMS
(MAIN AS STEP-DOWN)
2ms/div
MAX1566/67 toc20
MAIN (STEP-UP MODE)
LOAD TRANSIENT RESPONSE
MAX1566/67 toc22
ONSU
=
ONM =
ONSD
2V/div
V
SU
2V/div
V
SD
2V/div
V
M
2V/div
V
M
AC-COUPLED
100mV/div
I
0A
VIN = 3.0V, VSU = 5V
1ms/div
SU
200mA/div
0A
(MAIN AS STEP-UP)
= 3.0V, VM = 3.3V
V
IN
1ms/div
I
M
100mA/div
MAIN (STEP-DOWN MODE)
LOAD TRANSIENT RESPONSE
0V
0A
(MAIN AS STEP-DOWN FROM SU)
= 3.0V, VM = 3.3V
V
IN
1ms/div
MAX1566/67 toc23
V
M
AC-COUPLED
200mV/div
I
M
200mA/div
STEP-DOWN TRANSIENT RESPONSE
0V
0A
VIN = 3.0V, VSD = 1.8V
1ms/div
MAX1566/67 toc24
V
SD
AC-COUPLED
20mV/div
ISD
100mA/div
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