MAX1533 Datasheet, PDF (8/38 Pages) Maxim Integrated Products – High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers

High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V_IN = 12V, both SMPS enabled, V_CC = 5V, FSEL = REF, SKIP = GND, V_{ILIM_} = V_LDO5, V_INA = 15V, V_LDOA = 12V,
I_LDO5 = I_LDO3 = I_LDOA = no load, T_A = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX UNITS
FAULT DETECTION
Output Overvoltage Trip
Threshold
OVP = GND, with respect to error-
comparator threshold
+8
+15
%
Output Undervoltage-Protection
Trip Threshold
With respect to error-comparator threshold +65
+75
%
PGOOD Lower Trip Threshold
PGOOD Output Low Voltage
PGDLY Pulldown Resistance
PGDLY Trip Threshold
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
INPUTS AND OUTPUTS
Logic Input Voltage
With respect to error-comparator threshold,
hysteresis = 1%
I_SINK = 4mA
-14.0
REF-
0.2
R_DH BST_ - LX_ forced to 5V
DL_, high state
R_DL
DL_, low state
SKIP, hysteresis = 600mV
High
2.4
Low
-7.0
%
0.4
V
25
Ω
REF+
V
0.2
5
Ω
5
Ω
3
V
0.8
Fault Enable Logic Input Voltage
SHDN Input Trip Level
ON_ Input Voltage
FSEL Three-Level Input Logic
OVP, UVP, ONA
Rising trip level
Falling trip level
Clear fault level
SMPS off level
Delay start level (REF)
SMPS on level
High
REF
GND
High
Low
0.7 x
V_CC
1.1
0.95
1.9
2.4
V_CC - 0.2
1.7
V
0.4
2.2
V
1.05
0.8
1.6
V
2.1
2.3
V
0.4
Note 1: The MAX1533/MAX1537 cannot operate over all combinations of frequency, input voltage (V_IN), and output voltage. For
large input-to-output differentials and high-switching frequency settings, the required on-time may be too short to maintain
the regulation specifications. Under these conditions, a lower operating frequency must be selected. The minimum on-time
must be greater than 150ns, regardless of the selected switching frequency. On-time and off-time specifications are mea-
sured from 50% point to 50% point at the DH_ pin with LX_ = GND, V_{BST_} = 5V, and a 250pF capacitor connected from DH_
to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.
Note 2: When the inductor is in continuous conduction, the output voltage has a DC regulation level lower than the error-comparator
threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regula-
tion level higher than the trip level by approximately 1% due to slope compensation.
Note 3: Specifications are guaranteed by design, not production tested.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
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