MAX1540A Datasheet, PDF (5/49 Pages) Maxim Integrated Products – Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V_CC = V_DD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, T_A = 0°C to +85°C, unless otherwise noted. Typical
values are at T_A = +25°C.)
PARAMETER
REFERENCE (REF)
Reference Voltage
Reference Load Regulation
REF Lockout Voltage
REFIN1 (MAX1541)
Voltage Range
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
V_REF
V_CC = 4.5V to 5.5V, ^TA ^{= +25°C to +85°C 1.986}
I_REF = 0V
T_A = 0°C to +85°C 1.983
2.00
2.00
2.014
2.017
V
ΔV_REF I_REF = -10µA to +50µA
-0.01
+0.01
V
V_REF(UVLO) Rising edge, hysteresis = 350mV
1.95
V
V_REFIN
0.7
V_REF
V
REFIN1 (MAX1541)
Input Bias Current
I_REFIN1
0.01 0.05
µA
FAULT DETECTION
Overvoltage Trip Threshold
With respect to error-comparator threshold,
12
16
20
%
OVP/UVP = V_CC
Overvoltage Fault-Propagation
Delay
t_OVP FB forced 2% above trip threshold
10
µs
Output Undervoltage-Protection
Trip Threshold
With respect to error-comparator threshold,
65
70
75
%
OVP/UVP = V_CC
Output Undervoltage-Protection
Blanking Time
t_BLANK From rising edge of ON_
10
35
ms
Output Undervoltage Fault-
Propagation Delay
t_UVP
10
µs
PGOOD_ Lower Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
-13
-10
-7
%
PGOOD_ Upper Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
+7
+10 +13
%
PGOOD_ Propagation Delay
PGOOD_ Output Low Voltage
t_PGOOD_ FB forced 2% beyond PGOOD_ trip threshold
I_SINK = 4mA
10
µs
0.3
V
PGOOD_ Leakage Current
I_PGOOD_
FB = REF (PGOOD high impedance),
PGOOD forced to 5.5V
1
µA
Fault-Blanking Time
(MAX1541 Only)
t_FBLANK
FBLANK = V_CC
FBLANK = open
FBLANK = REF
120
220
320
80
140
205
µs
35
65
95
Thermal-Shutdown Threshold
T_SHDN Hysteresis = 10°C
LDOON = V_CC
LDOON = GND
+150
°C
+160
V_CC Undervoltage-Lockout
Threshold
V_UVLO(VCC)
Rising edge, PWM disabled below this
level, hysteresis = 20mV
4.1
4.25
4.4
V
CURRENT LIMIT
ILIM_ Adjustment Range
0.25
2
V
Current-Limit Input Range
CSP_
CSN_
0
2.7
V
-0.3
+28
CSP_/CSN_ Input Current
0.5
µA
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