MAX1587AETL Maxim Integrated Products, MAX1587AETL Datasheet - Page 9

• Manufacturer Part Number: MAX1587AETL
• Description: Other Power Management PMICs w/Dynamic Core for PDAs
• Manufacturer: Maxim Integrated Products

ELECTRICAL CHARACTERISTICS (continued)
Note 1: Dropout voltage is guaranteed by the p-channel switch resistance and assumes a maximum inductor resistance of 45mΩ.
Note 2: The PWM-skip-mode transition has approximately 10mA of hysteresis.
Note 3: The maximum output current is guaranteed by the following equation:
Note 4: POK only indicates the status of supplies that are enabled (except V7). When a supply is turned off, POK does not trigger
Note 5: Specifications to -40°C are guaranteed by design, not production tested.
where:
and
low. When a supply is turned on, POK immediately goes low until that supply reaches regulation. POK is forced low when all
supplies (except V7) are disabled.
Dynamic Core for PDAs and Smart Phones
R
R
R
I
f = operating frequency minimum
L = external inductor value
I
small relative to the absolute value.
OUT(MAX)
LIM
N
P
L
= p-channel power switch R
= external inductor ESR
_______________________________________________________________________________________
= n-channel synchronous rectifier R
can be substituted for I
= maximum required load current
High-Efficiency, Low-I
I
OUT MAX
D
OUT(MAX)
=
(
DS(ON)
V
V
OUT
IN
)
(desired) when solving for D. This assumes that the inductor ripple current is
+
=
+
DS(ON)
I
1
OUT MAX
I
OUT MAX
+
I
LIM
(
(
(
R
N
−
)
)
(
+
R
(
V
R
N
R
OUT
2
N
L
−
)
+
x f x L
R
2 2 x f x L
R
P
(
1
(
L
)
1
)
−
−
D
D
)
)
Q
PMICs with
9