LTC1436A Ver la hoja de datos (PDF) - Linear Technology
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LTC1436A Datasheet PDF : 28 Pages
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LTC1436A
LTC1436-PLL-A/LTC1437A
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
Low-Battery Comparator
VSATLBO
LBO Saturation Voltage
ILLBO
LBO Leakage
VTHLBI
LBI Trip Voltage
IINLBI
LBI Input Current
VHYSLBO
LBO Hysteresis
Auxiliary Regulator/Comparator
IAUXDR
AUXDR Current
Max Current Sinking Capability
Control Current
Leakage When Off
IIN AUXFB
IIN AUXON
VTH AUXON
VSAT AUXDR
VAUXFB
AUXFB Input Current
AUXON Input Current
AUXON Trip Voltage
AUXDR Saturation Voltage
AUXFB Voltage
VTH AUXDR AUXFB Divider Disconnect Voltage
CONDITIONS
MIN TYP MAX
ILBO = 1.6mA, VLBI = 1.1V
VLBO = 12V, VLBI = 1.4V
High to Low Transition on LBO
VLBI = 1.19V
0.6
1
q
0.01
1
q 1.16 1.19 1.22
q
1
50
20
VEXTVCC = 0V
VAUXDR = 4V, VAUXFB = 1.0V, VAUXON = 5V
VAUXDR = 5V, VAUXFB = 1.5V, VAUXON = 5V
VAUXDR = 24V, VAUXFB = 1.5V, VAUXON = 0V
10
15
1
5
0.01
1
VAUXFB = 1.19V, VAUXON = 5V
0.01
1
VAUXON = 5V
0.01
1
VAUXDR = 4V, VAUXFB = 1.0V
1.0 1.19 1.4
IAUXDR = 1.6mA, VAUXFB = 1.0V, VAUXON = 5V
0.4
0.8
VAUXON = 5V, 11V < VAUXDR < 24V (Note 5)
q 11.5
12
12.5
VAUXON = 5V, 3V < VAUXDR < 7V (Note 5)
q 1.14 1.19 1.24
VAUXON = 5V (Note 5), Ramping Negative
7.5
8.5
9.5
UNITS
V
µA
V
nA
mV
mA
µA
µA
µA
µA
V
V
V
V
V
The q denotes specifications which apply over the full operating
temperature range.
LTC1436ACGN/LTC1436ACGN-PLL/LTC1437ACG: 0°C ≤ TA ≤ 70°C
LTC1436AIGN/LTC1436AIGN-PLL/LTC1437AIG: – 40°C ≤ TA ≤ 85°C
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1436ACGN/LTC1436ACGN-PLL/LTC1436AIGN/
LTC1436AIGN-PLL: TJ = TA + (PD)(110 °C/W)
LTC1437ACG/LTC1437AIG: TJ = TA + (PD)(95 °C/W)
Note 2: The LTC1436A/LTC1437A are tested in a feedback loop which
servos VOSENSE to the balance point for the error amplifier
(VITH = 1.19V).
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information
section.
Note 4: Oscillator frequency is tested by measuring the COSC charge and
discharge currents and applying the formula:
( ) ( ) fOSC (kHz) =
8.4(108)
COSC (pF) + 11
1
ICHG
+
1
IDIS
–1
Note 5: The Auxiliary Regulator is tested in a feedback loop which servos
VAUXFB to the balance point for the error amplifier. For applications with
VAUXDR > 9.5V, VAUXFB uses an internal resistive divider. See
Applications Information.
Note 6: The minimum on-time test condition corresponds to an inductor
peak-to-peak ripple current ≥ 40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
4
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