MAX1585ETJ+ Maxim Integrated Products, MAX1585ETJ+ Datasheet - Page 27

• Manufacturer Part Number: MAX1585ETJ+
• Description: IC DGTL CAM PWR SUP 5CH 32TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1585ETJ+

• Applications: Controller, Digital Camera
• Voltage - Input: 0.7 ~ 5.5 V
• Number Of Outputs: 5
• Voltage - Output: 1.25 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 12. Adding a PWM Channel with an External MAX1801
Slave Controller
Figure 13. Using SDOK to Gate 3.3V Power to CPU After the
Core Voltage Is in Regulation
The MAX1801 controller operation and design are simi-
lar to that of the MAX1584/MAX1585 AUX controllers.
All comments in the AUX Controller Component
V
OUT
AUX3 V-MODE
STEP-DOWN
MAX1584/MAX1585
STEP-DOWN
CURRENT-
PWM
MODE
PWM
(PARTIAL)
DL
FB
COMP
GND
______________________________________________________________________________________
TO BATT
MAX1801
PGSD
SDOK
PVSD
LXSD
ON3
DL3
FB3
DCON
OSC
5-Channel Slim DSC Power Supplies
REF
IN
TO V
OR PVSU
TO V
OR PVSU
BATT
BATT
PVSU
OSC
REF
TO PVSU
(PARTIAL)
MAX1584
MAX1585
+1.5V
3.3V
LOGIC
Selection section also apply to add-on MAX1801 slave
controllers. For more details, refer to the MAX1801 data
sheet.
The SDOK goes low when the step-down reaches regu-
lation. Some microcontrollers with low-voltage cores
require the high-voltage (3.3V) I/O rail not be powered
up until the core has a valid supply. The circuit in
Figure 13 accomplishes this by driving the gate of a
PFET connected between the 3.3V output and the
processor I/O supply.
Figure 14 shows a similar application where AUX1OK
gates 5V power to the CCD only after the +15V output
is in regulation. Alternately, power sequencing can also
be implemented by connecting RC networks to delay
the appropriate converter ON_ inputs.
The SCF output goes low only after the step-up reaches
regulation. It can be used to drive a P-channel MOSFET
switch that turns off the load of a selected supply in the
Figure 14. AUX1OK drives an external PFET that switches 5V to
the CCD only after the +15V CCD bias supply is in regulation.
Using
CURRENT-
STEP-UP
MODE
PWM
AUX1
PWM
(PARTIAL)
MAX1584
MAX1585
SDOK and AUX1OK for Power Sequencing
PVSU
V
AUX1OK
BATT
TO
PGSU
PVSU
LXSU
FBSU
DL1
FB1
PV
Using SCF for Full-Load Startup
L2
D6
V
TO
BATT
15V
100mA
GATED +5V
TO CCD
V
+5V
SU
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