MAX1533 Datasheet, PDF (4/38 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 = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LDO3 Output Voltage
LDO3 Bootstrap Switch Threshold
V_LDO3
Standby mode, 6V < V_IN < 26V,
0 < I_LOAD < 100mA
Rising edge of CSL3, hysteresis = 1%
3.20 3.35 3.42
V
2.83
3.10
V
LDO3 Bootstrap Switch
Resistance
LDO3 to CSL3, V_CSL3 = 3.2V,
I_LDO3 = 50mA
1
3
Ω
Short-Circuit Current
LDO3 = LDO5 = GND,
CSL3 = CSL5 = GND
150 220
mA
Short-Circuit Current (Switched
Over to CSL_)
LDO3 = LDO5 = GND, V_CSL3 > 3.1V,
V_CSL5 > 4.7V
AUXILIARY LINEAR REGULATOR (MAX1537 ONLY)
LDOA Voltage Range
INA Voltage Range
V_LDOA
V_INA
LDOA Regulation Threshold,
Internal Feedback
ADJA = GND, 0 < I_LDOA < 120mA,
V_INA > 13V
250
mA
5
23
V
6
24
V
11.4 12.0 12.4
V
ADJA Regulation Threshold,
External Feedback
ADJA Dual-Mode Threshold
ADJA Leakage Current
LDOA Current Limit
V_ADJA
0 < I_LDOA < 120mA, V_LDOA > 5.0V and
V_INA > V_LDOA + 1V
1.94 2.00 2.06
V
0.1
0.15
0.2
V
V_ADJA = 2.1V
-0.1
+0.1
µA
V_LDOA forced to V_INA - 1V, V_ADJA = 1.9V,
150
mA
V_INA > 6V
Secondary Feedback Regulation
Threshold
V_INA - V_LDOA
0.65 0.8 0.95
V
DL Duty Factor
INA Quiescent Current
INA Shunt Sink Current
INA Leakage Current
REFERENCE (REF)
Reference Voltage
Reference Load Regulation
REF Lockout Voltage
FAULT DETECTION
Output Overvoltage Trip
Threshold
I_INA
I_INA(SHDN)
V_INA - V_LDOA < 0.7V, pulse width with
respect to switching period
V_INA = 24V, I_LDOA = no load
V_INA = 28V
V_INA = 5V, LDOA disabled
V_REF
V_REF(UVLO)
V_CC = 4.5V to 5.5V, I_REF = 0
I_REF = -10µA to +100µA
Rising edge, hysteresis = 350mV
OVP = GND, with respect to error-
comparator threshold
33
%
50
165
µA
10
mA
30
µA
1.985 2.00 2.015
V
1.980
2.020
V
1.95
V
8
11
15
%
Output Overvoltage Fault-
Propagation Delay
t_OVP
50mV overdrive
10
µs
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