Datasheet
MAX1533A/MAX1537A
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
6 _______________________________________________________________________________________
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
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(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 TYP MAX
UNITS
High V
CC
- 0.2
REF 1.7 2.3FSEL Three-Level Input Logic
GND 0.4
V
OVP, UVP, SKIP, ONA, ON3, ON5 = GND
or V
CC
-1 +1
SHDN, 0V or 26V -1 +1
Input Leakage Current
FSEL = GND or V
CC
-3 +3
µA
CSL_ Discharge-Mode
On-Resistance
R
DISCHARGE
10 25 Ω
CSL_ Synchronous-Rectifier
Discharge-Mode Turn-On Level
0.2 0.3 0.4 V
PARAMETER
SYMBOL
CONDITIONS
MIN MAX
UNITS
INPUT SUPPLIES (Note 1)
LDO5 in regulation 6 26
V
IN
Input Voltage Range V
IN
IN = LDO5, V
OUT5
< 4.4V 4.5 5.5
V
V
IN
Operating Supply Current I
IN
LDO5 switched over to CSL5,
either SMPS on
35 µA
V
IN
Standby Supply Current
I
IN
(
STBY
)
V
IN
= 6V to 26V, both SMPS off,
includes I
SHDN
170 µA
V
IN
Shutdown Supply Current
I
IN
(
SHDN
)
V
IN
= 6V to 26V 17 µA
Quiescent Power Consumption P
Q
Both SMPS on, FB3 = FB5 = SKIP = GND,
V
CSL3
= 3.5V, V
CSL5
= 5.3V, V
INA
= 15V,
I
LDOA
= 0, P
IN
+ P
CSL3
+ P
CSL5
+ P
INA
4.5 mW
V
CC
Quiescent Supply Current I
CC
Both SMPS on, FB3 = FB5 = GND,
V
CSL3
= 3.5V, V
CSL5
= 5.3V
2.5 mA
MAIN SMPS CONTROLLERS
3.3V Output Voltage in
Fixed Mode
V
OUT3
V
IN
= 6V to 26V, SKIP = V
CC
(Note 2)
3.28 3.38
V
5V Output Voltage in Fixed Mode
V
OUT5
V
IN
= 6V to 26V, SKIP = V
CC
(Note 2)
4.975 5.125
V
Feedback Voltage in
Adjustable Mode
V
FB3
, V
FB5
V
IN
= 6V to 26V, FB3 or FB5,
duty factor = 20% to 80% (Note 2)
0.982 1.018
V
Output-Voltage Adjust Range Either SMPS 1.0 5.5 V
FB3, FB5 Adjustable-Mode
Threshold Voltage
Dual-mode comparator 0.1 0.2 V