MAX1585ETJ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1585ETJ ,5-Channel Slim DSC Power SuppliesFeaturesThe MAX1584/MAX1585 provide a complete power- Step-Up DC-DC Converter, 95% Efficient suppl ..
MAX1585ETJ+ ,5-Channel Slim DSC Power SuppliesFeaturesThe MAX1584/MAX1585 provide a complete power-♦ Step-Up DC-DC Converter, 95% Efficient suppl ..
MAX1586 ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesFeaturesThe MAX1586/MAX1587 power-management ICs are ♦ Six Regulators in One Package:optimized for ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart Phonesfeatures an additional linear regulatorMAX1587BACKUP(V6) for VCC_USIM and low-battery and dead- bat ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesELECTRICAL CHARACTERISTICS(V = 3.6V, V = 3.0V, V = 1.1V, V = 1.35V, circuit of Figure 5, T = 0°C to ..
MAX1586AETM+ ,High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and SmartphonesMAX1586A/MAX1586B/MAX1586C/MAX1587A/MAX1587C19-3089; Rev 4; 4/09High-Efficiency, Low-I PMICs withQD ..
MAX4246AKA+T ,Ultra-Small, Rail-to-Rail I/O with Disable, Single/Dual-Supply, Low-Power Op AmpsApplicationsMAX4245AXT+T -40°C to +125°C 6 SC70 AAZ● Portable Communications● Single-Supply Zero-Cr ..
MAX4246AKA-T ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsELECTRICAL CHARACTERISTICS(V = +2.7V, V = 0, V = 0, V = V /2, R connected from OUT to V /2, SHDN_ = ..
MAX4246AUA ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsFeaturesThe MAX4245/MAX4246/MAX4247 family of low-cost Rail-to-Rail Input and Output Voltage Swing ..
MAX4249ESD ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsfeatures make the' Input Common-Mode Voltage Range Includesdevices an ideal choice for portable/bat ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsapplications that require low distortion and/or low noise. ' Outputs Swing within 8mV of Rails with ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op AmpsMAX4249–MAX425719-1295; Rev 2; 4/98SOT23, Single-Supply, Low-Noise,Low-Distortion, Rail-to-Rail Op ..

MAX1585ETJ
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 FETsStep-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.
Applications
Digital Cameras
PDAs
FeaturesStep-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-UpThree Auxiliary PWM DC-DC ControllersNo Transformers (MAX1585)Up to 1MHz Operating Frequency1mA Shutdown ModeInternal Soft-Start ControlOverload ProtectionCompact 32-Pin Thin QFN Package (5mm x 5mm)
MAX1584/MAX1585
Ordering Information
Typical Operating Circuit
Pin Configuration
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
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, 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 (TA= +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
ELECTRICAL CHARACTERISTICS
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
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.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA= 0°C to +85°C, unless otherwise noted.)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA= -40°C to +85°C, unless otherwise noted.) (Note 8)
step-up starting at about 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 cur-
rent is limited.
Note 3:Since the device is powered from PVSU, a Schottky rectifier, connected from the input battery to PVSU, is required for low-
voltage startup, or if PVSD is connected to VINinstead of PVSU.
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 Applications
Informationsection.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
STEP-UP EFFICIENCY
vs. LOAD CURRENT
MAX1584/85 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
MAX1584/85 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
COMBINED BOOST-BUCK
EFFICIENCY vs. LOAD CURRENT
MAX1584/85 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY vs. INPUT VOLTAGE
MAX1584/85 toc04
INPUT VOLTAGE (V)
EFFICIENCY (%)
AUX1 EFFICIENCY vs. LOAD CURRENT
MAX5184/85 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX1585 AUX2 EFFICIENCY
vs. LOAD CURRENT
MAX5184/85 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
Typical Operating Characteristics
(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
Note 5:The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit.
Note 6:The idle mode current threshold is the transition point between fixed-frequency PWM operation and idle mode operation
(where switching rate varies with load). The specification is given in terms of inductor current. In terms of output current, the
idle mode transition varies with input-output voltage ratio and inductor value. For the step-up, the transition output current is
approximately 1/3 the inductor current when stepping from 2V to 3.3V. For the step-down, the transition current in terms of
output current is approximately 3/4 the inductor current when stepping down from 3.3V to 1.8V.
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:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(VPVSU= VPV= VPVSD= VINDL2= 3.6V, TA= -40°C to +85°C, unless otherwise noted.) (Note 8)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAX1584/85 toc07
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (VSU)
MAX5184/85 toc08
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1584/85 toc09
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)50250-25
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX1584/85 toc10
REFERENCE LOAD CURRENT (µA)
REFERENCE VOLTAGE (V)
OSCILLATOR FREQUENCY vs. ROSC
MAX1584/85 toc11
ROSC (kΩ)
OSCILLATOR FREQUENCY (kHz)
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1584/85 toc12
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)50250-25
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
AUX1 STARTUP RESPONSE
MAX1584/85 toc16
2ms/div
ON1
5V/div
OUT1
10V/div
IOUT1
100mA/div
STEP-UP LOAD-TRANSIENT RESPONSE
MAX1584/85 toc17
400µs/div
VOUTSU
AC-COUPLED
500mV/div
IOUT_SU
200mA/div0A
STEP-DOWN LOAD-
TRANSIENT RESPONSE
MAX1584/85 toc18
400µs/div
VOUTSD
AC-COUPLED
100mV/div
IOUT_SD
100mA/div0A
AUX MAXIMUM DUTY CYCLE
vs. FREQUENCY
MAX1584/85 toc13
FREQUENCY (kHz)
MAXIMUM DUTY CYCLE (%)
STEP-UP STARTUP RESPONSE
MAX1584/85 toc14
200µs/div
ONSU
5V/div
OUTSU
5V/div
IOUTSU
200mA/div
IIN
1.0A/div
STEP-DOWN STARTUP RESPONSE
MAX1584/85 toc15
4ms/div
ONSD
5V/div
OUTSD
5V/div
IOUTSD
200mA/div
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Detailed Description
The MAX1584/MAX1585 are complete power-conver-
sion ICs for slim digital still cameras. They can accept
input from a variety of sources, including single-cell Li+
batteries and 2-cell alkaline or NiMH batteries, as well
as systems designed to accept both battery types. The
MAX1584/MAX1585 include five DC-DC converter
channels to generate all required voltages (Figure 2
shows a functional diagram):Synchronous-rectified step-up DC-DC converter with
on-chip MOSFETs—Typically supplies 3.3V for main
system power or 5V to power other DC-DC convert-
ers for boost-buck designs.Synchronous-rectified step-down DC-DC converter
with on-chip MOSFETs—Typically supplies 1.8V for
the DSP core. Powering the step-down from the
step-up output provides efficient (up to 90%) boost-
buck functionality that supplies a regulated output
when the battery voltage is above or below the out-
put voltage. The step-down can also be powered
from the battery if there is sufficient headroom.AUX1 step-up controller—Typically used for 15V to
bias one or more of the LCD, CCD, and LED back-
lights.AUX2 step-up controller (MAX1584)—Typically sup-
plies remaining bias voltages with either a multi-out-
put flyback transformer or a boost converter with
charge-pump inverter. Alternately, can power white
LEDs for LCD backlighting.AUX2 inverter controller (MAX1585)—Typically sup-
plies negative CCD bias when high current is need-
ed for large pixel-count CCDs.AUX3 step-down controller—Typically steps 5V gen-
erated at PVSU down to 3.3V for system logic in
boost-buck designs.
Step-Up DC-DC Converter
The step-up DC-DC switching converter is typically used
to generate a 5V output voltage from a 1.5V to 4.5V bat-
tery input, but any voltage from VINto 5V can be set. An
internal NFET switch and a PFET 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 modu-
lated pulse width. Switching harmonics generated by
fixed-frequency operation are consistent and easily fil-
tered. Efficiency is enhanced under light (<75mA typ)
loading, by an idle mode that switches the step-up only
as needed to service the load. In this mode, the maxi-
mum inductor current is 250mA for each pulse.
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Figure 1. MAX1584/MAX1585 Typical Application for 2-Cell AA or 1-Cell Li+ Battery
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Figure 2. MAX1584/MAX1585 Functional Diagram
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
Step-Down DC-DC Converter
The step-down DC-DC converter is optimized for gen-
erating low output voltages (down to 1.25V) at high effi-
ciency. Output voltages lower than 1V can be set by
adding an additional resistor (see the Applications
Informationsection). The step-down runs from the volt-
age at PVSD. This pin can be connected directly to the
battery if sufficient headroom exists to avoid dropout;
otherwise, PVSD can be powered from the output of
another converter. The step-down can also operate
with the step-up for boost-buck operation.
Under moderate to heavy loading, the converter oper-
ates in a low-noise PWM mode with constant frequency
and modulated pulse width. Efficiency is enhanced
under light (<75mA typ) loading by assuming an idle
mode during which the step-down switches only as
needed to service the load. In this mode, the maximum
inductor current is 100mA for each pulse. The step-
down DC-DC is inactive until the step-up DC-DC is in
regulation.
The step-down also features an open-drain SDOKout-
put that goes low when the step-down output is in regu-
lation. SDOKcan be used to drive an external MOSFET
switch that gates 3.3V power to the processor after the
core voltage is in regulation. This connection is shown
in Figure 13.
Boost-Buck Operation
The step-down input can be powered from the output
of the step-up. By cascading these two channels, the
step-down output can maintain regulation even as the
battery voltage falls below the step-down output volt-
age. This is especially useful when trying to generate
3.3V from 1-cell Li+ inputs, or 2.5V from 2-cell alkaline
or NiMH inputs, or when designing a power supply that
must operate from both Li+ and alkaline/NiMH inputs.
Compound efficiencies of up to 90% can be achieved
when the step-up and step-down are operated in
series.
Note that the step-up output supplies both the step-up
load and the step-down input current when the step-
down is powered from the step-up. The step-down
input current reduces the available step-up output cur-
rent for other loads.
Direct Battery Step-Down Operation
The step-down converter can also be operated directly
from the battery as long as the voltage at PVSD does
not exceed PVSU by more than a Schottky diode for-
ward voltage. When using this connection, connect an
external Schottky diode from the battery input to PVSU.
On the MAX1584/MAX1585, there is an internal 10kΩ
resistance from PVSU to PVSD. This adds a small addi-
tional current drain (of approximately (VPVSU- VPVSD) /
10kΩ) from PVSU when PVSD is not connected directly
to PVSU.
Step-down direct battery operation improves efficiency
for the step-down output (up to 95%), but restricts the
upper limit of the output voltage to 200mV less than the
minimum battery voltage. In 1-cell Li+ designs (with a
2.7V min), the output can be set up to 2.5V. In 2-cell
alkaline or NiMH designs, the output can be limited to
1.5V or 1.8V, depending on the minimum-allowed cell
voltage.
The step-down can only be briefly operated in dropout
since the MAX1584/MAX1585 fault protection detects
the out-of-regulation condition and activates after
100,000 OSC cycles (200ms at fOSC= 500kHz). At that
point, all MAX1584/MAX1585 channels shut down.
AUX1, AUX2, and AUX3 DC-DC Controllers
The three auxiliary controllers operate as fixed-frequen-
cy voltage-mode PWM controllers. They do not have
internal MOSFETs, so output power is determined by
external components. The controllers regulate output
voltage by modulating the pulse width of the DL_ drive
signal to an external MOSFET switch. The MAX1584
contains two step-up/flyback controllers (AUX1 and
AUX2) and one step-down controller (AUX3). The
MAX1585 contains one step-up controller (AUX1), one
inverting controller (AUX2), and one step-down con-
troller (AUX3).
Figure 3 shows a functional diagram of the AUX con-
trollers. The inverting and step-down controllers differ
from the step-up controllers only in the gate-drive logic
and FB polarity and threshold. The sawtooth oscillator
signal at OSC governs timing. At the start of each
cycle, DL_ turns on the external MOSFET switch. For
step-up controllers, DL_ goes high, while for inverting
and step-down controllers, DL_ goes low (to turn on
PFETs). The external MOSFET then turns off when the
internally level-shifted sawtooth rises above CC_ or
when the maximum duty cycle is exceeded. The switch
remains off until the start of the next cycle. A transcon-
ductance error amplifier forms an integrator at CC_ so
that high DC loop gain and accuracy can be main-
tained. In step-up and step-down controllers, the FB_
threshold is 1.25V, and higher FB_ voltages reduce the
MOSFET duty cycle. In inverting controllers, the FB_
threshold is 0V, and lower (more negative) FB_ volt-
ages reduce the MOSFET duty cycle.
Auxiliary controllers do not start until the step-up DC-DC
output is in regulation. If the step-up, step-down, or any
of the auxiliary controllers remains faulted for 100,000

Partno	Mfg	Dc	Qty	Available	Descript
MAX1585ETJ	MAXI	N/a	2095	avai	5-Channel Slim DSC Power Supplies