19-2712; Rev 0; 1/03
KIT
ATION
EVALU
BLE
AVAILA
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
General Description
Features
o
Step-Up DC-to-DC Converter
95% Efficient
3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output
Voltage
o
Step-Down DC-to-DC Converter
Operate from Battery for 95% Efficient Buck
Combine with Step-Up for 90% Efficient Buck-
Boost
Adjustable Output Down to 1.25V
o
Three Auxiliary PWM Controllers
o
Up to 1MHz Operating Frequency
o
1µA Shutdown Mode
o
Internal Soft-Start Control
o
Overload Protection
o
Compact 32-Pin, 5mm x 5mm Thin QFN Package
MAX1565
The MAX1565 provides a complete power-supply solution
for digital still and video cameras through the integration
of ultra-high-efficiency step-up/step-down DC-to-DC con-
verters along with three auxiliary step-up controllers. The
MAX1565 is targeted for applications that use either 2 or
3 alkaline or NiMH batteries as well as those using a
single lithium-ion (Li+) battery.
The step-up DC-to-DC converter accepts inputs from
0.7V to 5.5V and regulates a resistor-adjustable output
from 2.7V to 5.5V. It uses internal MOSFETs to achieve
95% efficiency. Adjustable operating frequency facili-
tates design for optimum size, cost, and efficiency.
The step-down DC-to-DC converter can produce output
voltages as low as 1.25V and also utilizes internal
MOSFETs to achieve 95% efficiency. An internal soft-
start ramp minimizes surge current from the battery.
The converter can operate from the step-up output pro-
viding buck-boost capability with up to 90% compound
efficiency, or it can run directly from the battery if buck-
boost operation is not needed.
The MAX1565 features auxiliary step-up controllers that
power CCD, LCD, motor actuator, and backlight cir-
cuits. The device also features low-cost expandability
by supplying power, an oscillator signal, and a refer-
ence to the MAX1801 SOT23 slave controller that sup-
ports step-up, SEPIC, and flyback configurations.
The MAX1565 is available in a space-saving 32-pin thin
QFN package.
Ordering Information
PART
MAX1565ETJ
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN
Pin Configuration
OUTSUB
26
COMP2
Applications
Digital Still Cameras
Digital Video Cameras
PDAs
TOP VIEW
FB2
GND
DL1
DL2
DL3
32
COMP1
1
2
3
4
5
6
7
8
9
ON1
31
30
29
28
27
25
24
COMP3
23
SDOK
22
OUTSUA
21
LXSU
Typical Operating Circuit
INPUT
+0.7V TO +5.5V
FB1
PGNDA
LXSD
MAX1565
STEP-UP
STEP-DOWN
ONSU
ONSD
ON1
ON2
0N3
AUX1
AUX2
AUX3
MAIN +3.3V
CORE +1.5V
MOTOR +5V
CCD +15V/-7.5V
LCD, LED +15V
INSD
ONSD
COMPSD
FBSD
MAX1565
FB3
20
PGNDB
19
OSC
18
FBSEL1
17
FBSELSD
16
FBSELSU
10
ON2
11
ON3
12
ONSU
13
REF
14
FBSU
15
COMPSU
ON/OFF
CONTROLS
5mm x 5mm
THIN QFN
1
________________________________________________________________
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.
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
MAX1565
ABSOLUTE MAXIMUM RATINGS
OUTSU_, INSD, SDOK, ON_, FB_,
FBSEL_ to GND ....................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
DL_ to PGND...........................................-0.3V to OUTSU + 0.3V
LXSU Current (Note 1) ..........................................................3.6A
LXSD Current (Note 1) ........................................................2.25A
REF, OSC, COMP_ to GND.....................-0.3V to OUTSU + 0.3V
Continuous Power Dissipation (T
A
=+70°C)
32-Pin Thin QFN (derate 22mW/°C
above +70°C).............................................................1700mW
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 OUTSU and PGND, and LXSD has internal clamp diodes to INSD and PGND.
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
OUTSU
= 3.3V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
GENERAL
Input Voltage Range
Minimum Startup Voltage
Overload Protection Fault Interval
Thermal Shutdown
Thermal-Shutdown Hysteresis
Shutdown Supply Current into
OUTSU
Step-Up DC-to-DC Supply
Current into OUTSU
Step-Up Plus 1 AUX Supply
Current into OUTSU
Step-Up Plus Step-Down Supply
Current into OUTSU
Reference Output Voltage
Reference Load Regulation
Reference Line Regulation
OSC Discharge Trip Level
OSC Discharge Resistance
OSC Discharge Pulse Width
OSC Frequency
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Startup-to-Normal
Operating Threshold Hysteresis
R
OSC
= 40kΩ, C
OSC
= 100pF
STEP-UP DC-TO-DC CONVERTER
Rising or falling edge (Note 4)
2.30
2.5
80
2.60
V
mV
ONSU = ONSD = ON1 = ON2 = ON3 = 0; OUTSU = 3.6V
ONSU = 3.35V, FBSU = 1.5V
(does not include switching losses)
ONSU = ON_ = 3.35V, FBSU = 1.5V, FB_ = 1.5V
(does not include switching losses)
ONSU = ONSD = 3.35V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
I
REF
= 20µA
10µA < I
REF
< 200µA
2.7 < OUTSU < 5.5V
Rising edge
OSC = 1.5V, I
OSC
= 3mA
1.225
1.23
(Note 2)
I
LOAD
< 1mA, T
A
= +25°C, startup voltage tempco is
-2300ppm/°C (typ) (Note 3)
0.7
0.9
100,000
160
20
0.1
290
420
470
1.25
4.5
1.3
1.25
52
300
400
5
400
600
650
1.27
10
5
1.275
80
5.5
1.1
V
V
OSC
cycles
°C
°C
µA
µA
µA
µA
V
mV
mV
V
Ω
ns
kHz
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(V
OUTSU
= 3.3V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
OUTSU Regulation Voltage
FBSU to COMPSU
Transconductance
FBSU Input Leakage Current
Idle-Mode™ Trip Level
Current-Sense Amplifier
Transresistance
Step-Up Maximum Duty Cycle
OUTSU 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
FBSD Regulation Voltage
OUTSD Regulation Voltage
FBSD to COMPSD
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 Operating Voltage Range
FBSD = 0.4V; 0.1mA into SDOK pin
1.0
V
LXSD
= 5.5V, OUTSU = 5.5V
V
LXSD
= 0V, OUTSU = 5.5V
N-channel
P-channel
0.7
FBSELSD = GND
FBSD = COMPSD
FBSD = 1.25V
(Note 6)
OUTSU = 1.8V (Note 5)
OUTSU = 1.8V
OUTSU = 1.8V
1.231
1.48
80
-100
110
FBSU = 1V
V
LX
= 0V, OUTSU = 5.5V
V
LXSU
= V
OUT
= 5.5V
N-channel
P-channel
1.6
80
FBSELSU = GND
FBSU = COMPSU
FBSU = 1.25V
(Note 6)
CONDITIONS
MIN
2.7
1.231
3.296
80
-100
150
1.25
3.35
135
+1
200
0.3
85
0.01
0.01
95
150
2
20
800
700
200
1.25
1.5
135
+1
160
0.60
0.01
0.01
95
150
0.79
20
4096
0.002
0.1
5.5
20
20
150
250
1.0
1.269
1.52
185
+100
190
90
20
20
150
250
2.4
TYP
MAX
5.5
1.269
3.404
185
+100
265
UNITS
V
V
V
µS
nA
mA
V/A
%
µA
µA
mΩ
A
mA
mA
ns
kHz
V
V
µS
nA
mA
V/A
µA
mΩ
A
mA
OSC
cycles
V
V
MAX1565
STEP-DOWN DC-TO-DC CONVERTER
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
3
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
MAX1565
ELECTRICAL CHARACTERISTICS (continued)
(V
OUTSU
= 3.3V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
Maximum Duty Cycle
FB_ Regulation Voltage
FB_ to COMP_
Transconductance
FB_ Input Leakage Current
AUX1 Output Regulation Voltage
DL_ Driver Resistance
DL_ Drive Current
Soft-Start Interval
LOGIC INPUTS (ON_ , FBSEL_)
Input Low Level
1.1V < OUTSU < 1.8V (ONSU only)
1.8V < OUTSU < 5.5V
1.1V < OUTSU < 1.8V (ONSU only)
1.8V < OUTSU < 5.5V
FBSEL_ Input Leakage Current
ON_ Impedance to GND
FBSEL = 3.6V, OUTSU = 3.6V
FBSEL = GND, OUTSU = 3.6V
ON_ = 3.35V
V
OUTSU
- 0.2
1.6
-100
-100
0
0
330
+100
+100
nA
kΩ
0.2
0.4
V
FB_ = 1V
FB_ = COMP_
FB_ = COMP_
FB_ = 1.25V
FBSEL1 = GND, FB1 connected directly to AUX1 output
Output high
Output low
Sourcing or sinking
CONDITIONS
MIN
80
1.231
80
-100
4.93
TYP
85
1.25
135
+1
5
3
2
0.5
4096
MAX
90
1.269
185
+100
5.07
10
5
UNITS
%
V
µS
nA
V
Ω
A
OSC
cycles
AUXILIARY DC-TO-DC CONTROLLERS (AUX 1, 2, AND 3)
Input High Level
V
ELECTRICAL CHARACTERISTICS
(V
OUTSU
= 3.3V,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
GENERAL
Input Voltage Range
Minimum Startup Voltage
Shutdown Supply Current into
OUTSU
Step-Up DC-to-DC Supply
Current into OUTSU
Step-Up Plus 1 AUX Supply
Current into OUTSU
Step-Up Plus Step-Down Supply
Current into OUTSU
Reference Output Voltage
Reference Load Regulation
(Note 2)
I
LOAD
< 1mA, T
A
= +25°C, startup voltage tempco is
-2300ppm/°C (typ) (Note 3)
ONSU = ONSD = ON1 = ON2 = ON3 = 0
OUTSU = 3.6V
ONSU = 3.35V, FBSU = 1.5V
(does not include switching losses)
ONSU = ON_ = 3.35V, FBSU = 1.5V, FB_ = 1.5V
(does not include switching losses)
ONSU = ONSD = 3.35V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
I
REF
= 20µA
10µA < I
REF
< 200µA
1.23
0.7
5.5
1.1
5
400
600
650
1.27
10
V
V
µA
µA
µA
µA
V
mV
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(V
OUTSU
= 3.3V,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
Reference Line Regulation
OSC Discharge Trip Level
OSC Discharge Resistance
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
OUTSU Regulation Voltage
FBSU to COMPSU
Transconductance
FBSU Input Leakage Current
Idle-Mode Trip Level
Step-Up Maximum Duty Cycle
OUTSU Leakage Current
LXSU Leakage Current
Switch On-Resistance
N-Channel Current limit
STEP-DOWN DC-TO-DC CONVERTER
FBSD Regulation Voltage
OUTSD Regulation Voltage
FBSD to COMPSD
Transconductance
FBSD Input Leakage Current
Idle-Mode Trip Level
LXSD Leakage Current
Switch On-Resistance
P-Channel Current Limit
SDOK Output Low Voltage
SDOK Operating Voltage Range
AUXILIARY DC-TO-DC CONTROLLERS (AUX 1, 2, AND 3)
Maximum Duty Cycle
FB_ Regulation Voltage
FB_ = 1V
FB_ = COMP_
80
1.225
90
1.275
%
V
FBSD = 0.4V; 0.1mA into SDOK pin
1
FBSELSD = GND
FBSD = COMPSD
FBSD = 1.25V
(Note 6)
V
LXSD
= 5.5V, OUTSU = 5.5V
V
LXSD
= 0V, OUTSU = 5.5V
N-channel
P-channel
0.7
1.225
1.47
80
-100
110
1.275
1.53
185
+100
195
20
20
150
250
1.0
0.1
5.5
V
V
µS
nA
mA
µA
mΩ
A
V
V
FBSELSU = GND
FBSU = COMPSU
FBSU = 1.25V
(Note 6)
FBSU =1V
V
LX
= 0V, OUTSU = 5.5V
V
LXSU
= V
OUT
= 5.5V
N-channel
P-channel
1.6
Rising edge
OSC = 1.5V, I
OSC
= 3mA
CONDITIONS
2.7V < OUTSU < 5.5V
1.225
MIN
TYP
MAX
5
1.275
80
UNITS
mV
V
Ω
MAX1565
STEP-UP DC-TO-DC CONVERTER
Rising or falling edge (Note 4)
2.30
2.7
1.225
3.283
80
-100
150
80
2.60
5.5
1.275
3.417
185
+100
275
90
20
20
150
250
2.4
V
V
V
V
µS
nA
mA
%
µA
µA
mΩ
A
_______________________________________________________________________________________
5
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