MAX1586A Datasheet, PDF (9/32 Pages) Maxim Integrated Products – High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones

High-Efficiency, Low-I_Q PMICs with
Dynamic Core for PDAs and Smart Phones
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:
I_LIM
−
V_OUT (1 − D)
2 x f xL
I_OUTmax
=
1+
(R_N
+
R_L)
(1 −
2xf
D)
xL
where:
D = ^{VOUT + IOUT(MAX) (RN + RL)}
V_IN + I_OUT(MAX) (R_N − R_P)
and R_N = N-channel synchronous rectifier R_DS(ON)
R_P = P-channel power switch R_DS(ON)
R_L = external inductor ESR
I_OUT(MAX) = maximum required load current
f = operating frequency minimum
L = external inductor value
I_LIM can be substituted for I_OUT(MAX) (desired) when solving for D. This assumes that the inductor ripple current is
small relative to the absolute value.
Note 4: POK only indicates the status of supplies that are enabled (except V7). When a supply is turned off, POK does not trigger
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.
Note 5: Specifications to -40°C are guaranteed by design, not production tested.
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