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LTC1439CGW Datasheet(PDF) 4 Page - Linear Technology

Part # LTC1439CGW
Description  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1439CGW Datasheet(HTML) 4 Page - Linear Technology

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4
LTC1438/LTC1439
ELECTRICAL CHARACTERISTICS T
A = 25°C, VIN = 15V, VRUN/SS1,2 = 5V unless otherwise noted.
The q denotes specifications which apply over the full operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1438CG, LTC1439CG: TJ = TA + (PD)(95°C/W)
LTC1439CGW: TJ = TA + (PD)(85°C/W)
Note 2: The LTC1438 and LTC1439 are tested in a feedback loop which
servos VOSENSE1,2 to the balance point for the error amplifier
(VITH1,2 = 1.19V).
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 4: Oscillator frequency is tested by measuring the COSC charge and
discharge current (IOSC) and applying the formula:
fOSC (kHz) = 8.4(108)[COSC (pF) + 11]–1 (1/ICHG + 1/IDISC) –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 section.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Low-Battery Comparator
VSATLBO
LBO Saturation Voltage
ILBO = 1.6mA, VLBI = 1.1V
0.6
1
V
ILLBO
LBO Leakage
VLBO = 12V, VLBI = 1.4V
q
0.01
1
µA
VTHLB1
LBI Trip Voltage
High to Low Transition on LBO
q
1.16
1.19
1.22
V
IINLB1
LBI Input Current
VLBI = 1.19V
q
150
nA
VHYSLBO
LBO Hysteresis
20
mV
Auxiliary Regulator/Comparator
IAUXDR
AUXDR Current
VEXTVCC = 0V
Max Current Sinking Capability
VAUXDR = 4V, VAUXFB = 1.0V, VAUXON = 5V
10
15
mA
Control Current
VAUXDR = 5V, VAUXFB = 1.5V, VAUXON = 5V
1
5
µA
Leakage when OFF
VAUXDR = 24V, VAUXFB = 1.5V, VAUXON = 0V
0.01
1
µA
IINAUXFB
AUXFB Input Current
VAUXFB = 1.19V, VAUXON = 5V
0.01
1
µA
IINAUXON
AUXON Input Current
VAUXON = 5V
0.01
1
µA
VTHAUXON
AUXON Trip Voltage
VAUXDR = 4V, VAUXFB = 1V
1.0
1.19
1.4
V
VSATAUXDR
AUXDR Saturation Voltage
IAUXDR = 1.6mA, VAUXFB = 1V, VAUXON = 5V
0.4
0.8
V
VAUXFB
AUXFB Voltage
VAUXON = 5V, 11V < VAUXDR < 24V (Note 5)
q
11.5
12.0
12.5
V
VAUXON = 5V, 3V < VAUXDR < 7V
q
1.14
1.19
1.24
V
VTHAUXDR
AUXFB Divider Disconnect Voltage
VAUXON = 5V (Note 5); Ramping Negative
7.5
8.5
9.5
V


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