MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
6 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN MAX UNITS
FBSD Regulation Voltage 1.225 1.275 V
FBSD to CCSD
Transconductance
FBSD = CCSD 80 185 µS
FBSD Input Leakage Current FBSD = 1.25V -100 +100 nA
LXSD Leakage Current V
LXSD
= 0 to 3.6V, PVSU = 3.6V 5 µA
N channel 150
Switch On-Resistance
P channel 250
mΩ
P-Channel Current Limit 0.65 0.95 A
SDOK Output Low Voltage 0.1mA into SDOK 0.1 V
SDOK Leakage Current ONSU = GND 1 µA
AUX1, 2, 3 DC-DC CONTROLLERS
Maximum Duty Cycle FB_ = 1V 80 90 %
FB1 and FB3 Regulation Voltage FB_ = CC_ 1.225 1.275 V
FB2 (MAX1584) Regulation
Voltage
FB_ = CC_ 1.225 1.275 V
FB2 (MAX1585) (Inverter)
Regulation Voltage
FB_ = CC_ -0.01 +0.01 V
FB_ to CC_ Transconductance FB_ = CC_ 80 185 µS
FB_ Input Leakage Current FB_ = 1.25V -100 +100 nA
DL_ Driver Resistance Output high or low 10 Ω
AUX1OK Output Low Voltage 0.1mA into AUX1OK 0.1 V
AUX1OK Leakage Current ONSU = GND 1 µA
OVERLOAD AND THERMAL PROTECTION
SCF Leakage Current ONSU = PVSU, FBSU = 1.5V 1 µA
SCF Output Low Voltage 0.1mA into SCF 0.1 V
LOGIC INPUTS
1.1V < PVSU < 1.8V (ONSU only) 0.2
ON_ Input Low Level
1.8V < PVSU < 5.5V 0.4
V
1.1V < PVSU < 1.8V (ONSU only) V
PVSU
- 0.2
ON_ Input High Level
1.8V < PVSU < 5.5V 1.6
V
ELECTRICAL CHARACTERISTICS (continued)
(V
PVSU
= V
PV
= V
PVSD
= V
INDL2
= 3.6V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 8)
Note 2: The MAX1584/MAX1585 are powered from the step-up output (PVSU). An internal low-voltage startup oscillator drives the
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 V
IN
instead 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
Information section.
(26 paginas)
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