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PDF MAX1584 Data sheet ( Hoja de datos )
| Número de pieza | MAX1584 | |
| Descripción | 5-Channel Slim DSC Power Supplies | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2883; Rev 0; 7/03
EVAALVUAAILTAIOBNLEKIT
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.
Applications
Digital Cameras
PDAs
Typical Operating Circuit
INPUT
0.7V TO 5.5V
MAX1585
ONSU
ONSD
ON1
ON2
ON3
STEP-UP
STEP-DOWN
AUX1
AUX2
AUX3
SYSTEM +5V
CORE +1.8V
LCD, CCD, LED +15V
CCD -7.5V
LOGIC +3.3V
Features
o Step-Up DC-DC Converter, 95% Efficient
o Step-Down DC-DC Converter
Operate from Battery for 95% Efficient
Step-Down
90% Efficient Boost-Buck with Step-Up
o Three Auxiliary PWM DC-DC Controllers
o No Transformers (MAX1585)
o Up to 1MHz Operating Frequency
o 1mA Shutdown Mode
o Internal Soft-Start Control
o Overload Protection
o Compact 32-Pin Thin QFN Package (5mm x 5mm)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX1584ETJ
-40°C to +85°C
32 Thin QFN
5mm x 5mm
AUX
FUNCTIONS
2 step-up
1 step-down
MAX1585ETJ
-40°C to +85°C
32 Thin QFN
5mm x 5mm
1 step-up
1 step-down
1 inverting
Pin Configuration
32 31 30 29 28 27 26 25
CC1 1
24 CC2
FB1 2
23 FB2
PGSD 3
22 PVSU
LXSD 4
PVSD 5
MAX1584
MAX1585
21 LXSU
20 PGSU
ONSD 6
19 OSC
CCSD 7
18 SCF
FBSD 8
17 SDOK
9 10 11 12 13 14 15 16
THIN QFN
5mm x 5mm
________________________________________________________________ Maxim Integrated Products 1
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 page  
5-Channel Slim DSC Power Supplies
ELECTRICAL CHARACTERISTICS
(VPVSU = VPV = VPVSD = VINDL2 = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) (Note 8)
PARAMETER
GENERAL
Input Voltage Range
Shutdown Supply Current
into PVSU
(Note 2)
PVSU = 3.6V
CONDITIONS
Supply Current into PV with
Step-Up Enabled
ONSU = 3.6V, FBSU = 1.5V
(does not include switching losses)
Supply Current into PV with
ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
Step-Up and Step-Down Enabled (does not include switching losses)
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)
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference Line Regulation
IREF = 20µA
10µA < IREF < 200µA
2.7V < PVSU < 5.5V
OSCILLATOR
OSC Discharge Trip Level
Rising edge
OSC Discharge Resistance
OSC = 1.5V, IOSC = 3mA
STEP-UP DC-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Rising edge or falling edge (Note 4)
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
FBSU to CCSU
Transconductance
FBSU = CCSU
FBSU Input Leakage Current
FBSU = 1.25V
Step-Up Maximum Duty Cycle FBSU = 1V
PVSU Leakage Current
LXSU Leakage Current
Switch On-Resistance
VLX = 0V, PVSU = 5.5V
VLXSU = VOUT = 5.5V
N channel
P channel
N-Channel Current Limit
STEP-DOWN DC-DC CONVERTER
Step-Down Output Voltage Adjust
Range
PVSD must be greater than output (Note 7)
MIN
0.7
1.225
1.225
2.30
3.0
1.225
80
-100
80
2.4
1.25
MAX
UNITS
5.5 V
5 µA
450 µA
700 µA
650 µA
1.275
10
5
1.275
80
V
mV
mV
V
Ω
2.65
5.5
1.275
185
+100
90
5
5
150
250
3.2
V
V
V
µS
nA
%
µA
µA
mΩ
A
5.00 V
_______________________________________________________________________________________ 5
5 Page 
5-Channel Slim DSC Power Supplies
Pin Description (continued)
PIN NAME
FUNCTION
16
AUX1OK Open-Drain Power-OK Signal for AUX1 Controller. AUX1OK is low when the AUX1 controller has
successfully completed soft-start. This pin is high impedance in shutdown, overload, and thermal limit.
17
SDOK
Open-Drain Power-OK Signal for Step-Down Converter. SDOK is low when the step-down has successfully
completed soft-start. This pin is high impedance in shutdown, overload, and thermal limit.
Short-Circuit Flag, Active-Low, Open-Drain Output. SCF is high impedance when overload protection
18
SCF
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.
Oscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to PVSU
19
OSC
(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.
20
PGSU
Step-Up Power Ground. Connect all PG_ pins together and to GND with short traces as close to the IC as
possible.
21
LXSU
Step-Up Converter Switching Node. Connect to the inductor of the step-up converter. LXSU is high
impedance in shutdown.
22
PVSU
Power Output of the Step-Up DC-DC Converter. Connect the output filter capacitor from PVSU to PGSU.
PVSU can also power other converter channels. Connect PVSU to PV at the IC.
MAX1585 (AUX2 inverter): The FB2 feedback threshold is 0V.
Connect a resistive voltage-divider from the output voltage to FB2 to
AUX2 Controller Feedback Input. REF to set the output voltage.
23 FB2 This pin is high impedance in
shutdown.
MAX1584 (AUX2 step-up): The FB2 feedback threshold is 1.25V.
Connect a resistive voltage-divider from the output voltage to FB2 to
GND to set the output voltage.
AUX2 Controller Compensation Node. Connect a series resistor-capacitor from CC2 to GND to
24 CC2 compensate the control loop. CC2 is actively driven to GND in shutdown and thermal limit. See the AUX
Compensation section.
MAX1585 (AUX2 inverter): Connect INDL2 to the external P channel
Voltage Input for the AUX2 Gate MOSFET source (typically the battery) to ensure the P channel is
25 INDL2 Driver. The voltage at INDL2 sets completely off when D2 swings high.
the high gate-drive voltage.
MAX1584 (AUX2 step-up): Connect INDL2 to PVSU for optimum
N-channel gate drive.
26 PV IC Power Input. Connect PVSU and PV together.
MAX1585: DL2 drives a PFET in an inverter configuration. In
AUX2 Controller Gate-Drive
shutdown, overload, and thermal limit, DL2 is driven high.
27
DL2 Output. DL2 drives between
MAX1584: DL2 drives an N-channel FET in a boost/flyback
INDL2 and GND.
configuration. In shutdown, overload, and thermal limit, DL2 is driven
low.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MAX1584.PDF ] | |
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