19-2883; Rev 0; 7/03
5-Channel Slim DSC Power Supplies
General Description
The MAX1584/MAX1585 provide a complete power-
supply solution for slim digital cameras. They improve
performance, component count, and size compared to
conventional multichannel controllers in 2-cell AA, 1-cell
Li+, and dual-battery designs. On-chip MOSFETs pro-
vide up to 95% efficiency for critical power supplies,
while additional channels operate with external FETs for
optimum design flexibility. This optimizes overall effi-
ciency and cost, while also reducing board space.
The MAX1584/MAX1585 include 5 high-efficiency DC-
DC conversion channels:
• Step-up DC-DC converter with on-chip FETs
• Step-down DC-DC converter with on-chip FETs
• Three PWM DC-DC controllers for CCD, LCD, LED,
or other functions
The step-down DC-DC converter can operate directly
from the battery or from the step-up output, providing
boost-buck capability with a compound efficiency of up
to 90%. Both devices include three PWM DC-DC con-
trollers: the MAX1584 includes two step-up controllers
and one step-down controller, while the MAX1585
includes one step-up controller, one inverting controller,
and one step-down controller. All DC-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 over-
load protection. The MAX1584/MAX1585 are available
in space-saving, 32-pin thin QFN packages. An evalua-
tion kit is available to expedite designs.
Features
♦
Step-Up DC-DC Converter, 95% Efficient
♦
Step-Down DC-DC Converter
Operate from Battery for 95% Efficient
Step-Down
90% Efficient Boost-Buck with Step-Up
♦
Three Auxiliary PWM DC-DC Controllers
♦
No Transformers (MAX1585)
♦
Up to 1MHz Operating Frequency
♦
1mA Shutdown Mode
♦
Internal Soft-Start Control
♦
Overload Protection
♦
Compact 32-Pin Thin QFN Package (5mm x 5mm)
MAX1584/MAX1585
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
32 Thin QFN
5mm x 5mm
32 Thin QFN
5mm x 5mm
AUX
FUNCTIONS
2 step-up
1 step-down
1 step-up
1 step-down
1 inverting
MAX1584ETJ
-40°C to +85°C
MAX1585ETJ
-40°C to +85°C
Applications
GND
CC3
DL1
Pin Configuration
INDL2
25
24
23
22
CC2
FB2
PVSU
LXSU
PGSU
OSC
SCF
SDOK
21
20
19
18
17
9
ON1
10
ON2
11
ON3
12
ONSU
13
REF
14
FBSU
15
CCSU
16
AUX1OK
DL3
DL2
27
FB3
PV
26
Digital Cameras
PDAs
32
31
30
29
28
Typical Operating Circuit
CC1
FB1
PGSD
LXSD
1
2
3
4
5
6
7
8
INPUT
0.7V TO 5.5V
MAX1585
STEP-UP
STEP-DOWN
ONSU
ONSD
ON1
ON2
ON3
AUX1
AUX2
AUX3
SYSTEM +5V
CORE +1.8V
LCD, CCD, LED +15V
CCD -7.5V
LOGIC +3.3V
PVSD
ONSD
CCSD
FBSD
MAX1584
MAX1585
THIN QFN
5mm x 5mm
________________________________________________________________
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.
5-Channel Slim DSC Power Supplies
MAX1584/MAX1585
ABSOLUTE MAXIMUM RATINGS
PV, PVSU, PVSD,
SDOK, AUX1OK,
SCF, ON_, FB_ to
GND..........................................................................-0.3V to +6V
PGND to GND....................................................…-0.3V to +0.3V
INDL2, DL1, DL3 to GND.........................-0.3V to (PVSU + 0.3V)
DL2 to GND ............................................-0.3V to (INDL2 + 0.3V)
PV to PVSU ...........................................................-0.3V to + 0.3V
LXSU 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)
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 PVSU and PGND, and LXSD has internal clamp diodes to PVSD and PGND. Applications
that forward bias these diodes should take care not to exceed the device’s 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
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
Shutdown Supply Current into PV
Supply Current into PV with
Step-Up Enabled
Supply Current into PV with
Step-Up and Step-Down 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
STEP-UP DC-DC CONVERTER
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
80
2.65
V
mV
R
OSC
= 47kΩ, C
OSC
=100pF
Rising edge
OSC = 1.5V, I
OSC
= 3mA
1.225
1.25
52
150
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 = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses)
0.7
0.9
0.1
300
450
5.5
1.1
5
450
700
V
V
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
400
650
µA
2
_______________________________________________________________________________________
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
Step-Up Voltage Adjust Range
Start Delay of ONSD, ON1, ON2,
ON3 after SU in Regulation
FBSU Regulation Voltage
FBSU to CCSU
Transconductance
FBSU Input Leakage Current
Idle Mode
TM
MAX1584/MAX1585
CONDITIONS
MIN
3.0
TYP
MAX
5.5
UNITS
V
OSC
cycles
1024
1.231
FBSU = CCSU
FBSU = 1.25V
(Note 6)
80
-100
1.25
135
+1
150
0.275
FBSU = 1V
V
LX
= 0V, PVSU = 5.5V
V
LXSU
= V
OUT
= 5.5V
N channel
P channel
2.4
PVSU = 1.8V (Note 5)
PVSU = 1.8V
PVSU = 1.8V
80
85
0.1
0.1
95
150
2.8
20
450
700
200
90
5
5
150
250
3.2
1.269
185
+100
V
µS
nA
mA
V/A
%
µA
µA
mΩ
A
mA
mA
ns
kHz
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
Step-Down Output Voltage
Adjust 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
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
(Note 6)
STEP-DOWN DC-DC CONVERTER
PVSD must be greater than output (Note 7)
1.25
1.231
80
-100
1.25
135
+0.1
100
0.5
0.1
95
150
0.8
20
2048
0.01
0.01
0.1
1
5
150
250
0.95
5.00
1.269
185
+100
V
V
µS
nA
mA
V/A
µA
mΩ
A
mA
OSC
cycles
V
µA
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
3
5-Channel Slim DSC Power Supplies
MAX1584/MAX1585
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
AUX1, 2, 3 DC-DC CONTROLLERS
Maximum Duty Cycle
FB1 and FB3 Regulation Voltage
FB2 (MAX1584) Regulation
Voltage
FB2 (MAX1585) (Inverter)
Regulation Voltage
FB_ to CC_ Transconductance
FB_ Input Leakage Current
DL_ Driver Resistance
DL_ Drive Current
Soft-Start Interval
AUX1OK
Output Low Voltage
AUX1OK
Leakage Current
0.1mA into
AUX1OK
ONSU = GND
FB_ = 1V
FB_ = CC_
FB_ = CC_
FB_ = CC_
FB_ = CC_
FB_ = 1.25V
Output high or low
Sourcing or sinking
80
1.231
1.231
-0.01
80
-100
85
1.25
1.25
0
135
+1
2.5
0.5
4096
0.01
0.01
0.1
1
90
1.269
1.269
+0.01
185
+100
10
%
V
V
V
µS
nA
Ω
A
OSC
cycles
V
µA
OSC
cycles
1
0.1
µA
V
°C
°C
0.2
0.4
V
PVSU
-
0.2
1.6
330
kΩ
CONDITIONS
MIN
TYP
MAX
UNITS
OVERLOAD AND THERMAL PROTECTION
Overload-Protection Fault Delay
SCF Leakage Current
SCF Output Low Voltage
Thermal Shutdown
Thermal Hysteresis
LOGIC INPUTS
ON_ Input Low Level
1.1V < PVSU < 1.8V (ONSU only)
1.8V < PVSU< 5.5V
1.1V < PVSU < 1.8V (ONSU only)
1.8V < PVSU < 5.5V
ON_ Impedance to GND
ON_ = 3.35V
V
ONSU = PVSU, FBSU = 1.5V
0.1mA into SCF
100,000
0.1
0.01
+160
20
ON_ Input High Level
V
4
_______________________________________________________________________________________
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS
(V
PVSU
= V
PV
= V
PVSD
= V
INDL2
= 3.6V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 8)
PARAMETER
GENERAL
Input Voltage Range
Shutdown Supply Current
into PVSU
Supply Current into PV with
Step-Up Enabled
Supply Current into PV with
Step-Up and Step-Down 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
STEP-UP DC-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
FBSU to CCSU
Transconductance
FBSU Input Leakage Current
Step-Up Maximum Duty Cycle
PVSU Leakage Current
LXSU Leakage Current
Switch On-Resistance
N-Channel Current Limit
STEP-DOWN DC-DC CONVERTER
Step-Down Output Voltage Adjust
Range
PVSD must be greater than output (Note 7)
1.25
5.00
V
FBSU = CCSU
FBSU = 1.25V
FBSU = 1V
V
LX
= 0V, PVSU = 5.5V
V
LXSU
= V
OUT
= 5.5V
N channel
P channel
2.4
Rising edge or falling edge (Note 4)
2.30
3.0
1.225
80
-100
80
2.65
5.5
1.275
185
+100
90
5
5
150
250
3.2
V
V
V
µS
nA
%
µA
µA
mΩ
A
Rising edge
OSC = 1.5V, I
OSC
= 3mA
1.225
1.275
80
V
Ω
I
REF
= 20µA
10µA < I
REF
< 200µA
2.7V < PVSU < 5.5V
1.225
1.275
10
5
V
mV
mV
(Note 2)
PVSU = 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 = ON1 = 3.6V, FBSU = 1.5V, FB2 = 1.5V
(does not include switching losses)
0.7
5.5
5
450
700
V
µA
µA
µA
CONDITIONS
MIN
MAX
UNITS
MAX1584/MAX1585
650
µA
_______________________________________________________________________________________
5
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