MAX1540A Datasheet, PDF (9/49 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 = -40°C to +85°C, unless otherwise noted.)
(Note 4)
PARAMETER
MAX1541 LDO Output-Voltage
Accuracy (Fixed V_LDOOUT)
MAX1541 LDO Feedback
Accuracy (Adjustable V_LDOOUT)
Dropout Voltage
REFERENCE (REF)
Reference Voltage
REFIN1 Input Bias Current
FAULT DETECTION
Overvoltage Trip Threshold
Output Undervoltage-Protection
Trip Threshold
PGOOD_ Lower Trip Threshold
PGOOD_ Upper Trip Threshold
PGOOD_ Output Low Voltage
V_CC Undervoltage-Lockout
Threshold
CURRENT LIMIT
Current-Limit Input Range
Valley Current-Limit Threshold
(Fixed)
Valley Current-Limit Threshold
(Adjustable)
INPUTS AND OUTPUTS
Logic Input Threshold
LDOON Input Trip Level
Dual Mode Threshold Voltage
SYMBOL
V_LDOOUT
V_FBLDO
CONDITIONS
FBLDO = ON1 =
ON2 = GND,
V_LDOIN = 6V to 28V
FBLDO = LDOOUT,
ON1 = ON2 = GND,
V_LDOIN = 4.5V to
28V
0 < I_LDOOUT < 10mA
0 < I_LDOOUT < 100mA
0 < I_LDOOUT < 10mA
0 < I_LDOOUT < 100mA
MAX1540A: V+ - V_LDOOUT, I_LDOOUT = 50mA
MAX1541: V_LDOIN - V_LDOOUT,
I_LDOOUT = 50mA
MIN
4.85
4.65
1.212
1.175
V_REF
I_REFIN1
V_CC = 4.5V to 5.5V, I_REF = 0
1.98
With respect to error-comparator threshold,
10
OVP/UVP = V_CC
With respect to error-comparator threshold,
64
OVP/UVP = V_CC
With respect to error-comparator threshold,
-14
hysteresis = 1%
With respect to error-comparator threshold,
+5
hysteresis = 1%
I_SINK = 4mA
V_UVLO(VCC)
Rising edge, PWM disabled below this
level, hysteresis = 20mV
4.1
CSP_
0
CSN_
-0.3
V_LIM_ _(VAL) V_CSP_ - V_CSN_, ILIM_ = V_CC
40
V_LIM_ _(VAL) V_CSP_ - V_CSN_, V_ILIM_ = 2.00V
160
ON1, ON2, SKIP, GATE, rising edge,
hysteresis = 225mV
1.2
Rising edge, hysteresis = 250mV
1.2
FB1 (MAX1540A),
High
1.9
FB2 (MAX1540A/MAX1541) _Low
0.05
MAX
5.10
5.10
UNITS
V
1.275
V
1.275
800
mV
800
2.02
V
0.05
µA
21
%
76
%
-5
%
+14
%
0.3
V
4.4
V
2.7
V
+28.0
60
mV
240
mV
2.2
V
1.3
V
2.1
V
0.15
_______________________________________________________________________________________ 9