Rainbow Electronics MAX1585 User Manual
Page 2
MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
2
_______________________________________________________________________________________
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 (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
ELECTRICAL CHARACTERISTICS
(V
PVSU
= V
PV
= V
PVSD
= V
INDL2
= 3.6V, T
A
= 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL
Input Voltage Range
(Note 2)
0.7
5.5
V
Step-Up Minimum Startup
Voltage
I
LOAD
< 1mA, T
A
= +25
°C, startup voltage tempco is
-2300ppm/
°C (typ) (Note 3)
0.9
1.1
V
Shutdown Supply Current into PV
PV = 3.6V
0.1
5
µA
Supply Current into PV with
Step-Up Enabled
ONSU = 3.6V, FBSU = 1.5V
(does not include switching losses)
300
450
µA
Supply Current into PV with
Step-Up and Step-Down Enabled
ONSU = ONSD = 3.6V, FBSU = 1.5V, FBSD = 1.5V
(does not include switching losses)
450
700
µA
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)
400
650
µA
REFERENCE
Reference Output Voltage
I
REF
= 20µA
1.23
1.25
1.27
V
Reference Load Regulation
10µA < I
REF
< 200µA
4.5
10
mV
Reference Line Regulation
2.7 < PVSU < 5.5V
1.3
5
mV
OSCILLATOR
OSC Discharge Trip Level
Rising edge
1.225
1.25
1.275
V
OSC Discharge Resistance
OSC = 1.5V, I
OSC
= 3mA
52
80
Ω
OSC Discharge Pulse Width
150
ns
OSC Frequency
R
OSC
= 47k
Ω, C
OSC
=100pF
500
kHz
STEP-UP DC-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Rising edge or falling edge (Note 4)
2.30
2.5
2.65
V
Step-Up Startup-to-Normal
Operating Threshold Hysteresis
80
mV
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.