参数资料
型号: LTC1439IGW
厂商: Linear Technology
文件页数: 4/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-SSOP
标准包装: 32
PWM 型: 电流模式
输出数: 2
频率 - 最大: 138kHz
占空比: 99%
电源电压: 3.5 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-BSOP(0.295",7.50mm 宽)
包装: 管件
LTC1438/LTC1439
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range. T A = 25 ° C, V IN = 15V, V RUN/SS1,2 = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Low-Battery Comparator
V SATLBO
LBO Saturation Voltage
I LBO = 1.6mA, V LBI = 1.1V
0.6
1
V
I LLBO
LBO Leakage
V LBO = 12V, V LBI = 1.4V
0.01
1
μ A
V THLB1
I INLB1
LBI Trip Voltage
LBI Input Current
High to Low Transition on LBO
V LBI = 1.19V
1.16
1.19
1
1.22
50
V
nA
V HYSLBO
LBO Hysteresis
20
mV
Auxiliary Regulator/Comparator
I AUXDR
AUXDR Current
V EXTVCC = 0V
Max Current Sinking Capability
V AUXDR = 4V, V AUXFB = 1.0V, V AUXON = 5V
10
15
mA
Control Current
Leakage when OFF
V AUXDR = 5V, V AUXFB = 1.5V, V AUXON = 5V
V AUXDR = 24V, V AUXFB = 1.5V, V AUXON = 0V
1
0.01
5
1
μ A
μ A
I INAUXFB
I INAUXON
AUXFB Input Current
AUXON Input Current
V AUXFB = 1.19V, V AUXON = 5V
V AUXON = 5V
0.01
0.01
1
1
μ A
μ A
V THAUXON
V SATAUXDR
AUXON Trip Voltage
AUXDR Saturation Voltage
V AUXDR = 4V, V AUXFB = 1V
I AUXDR = 1.6mA, V AUXFB = 1V, V AUXON = 5V
1.0
1.19
0.4
1.4
0.8
V
V
V AUXFB
V THAUXDR
AUXFB Voltage
AUXFB Divider Disconnect Voltage
V AUXON = 5V, 11V < V AUXDR < 24V (Note 6)
V AUXON = 5V, 3V < V AUXDR < 7V
V AUXON = 5V (Note 6); Ramping Negative
11.5
1.14
7.5
12.0
1.19
8.5
12.5
1.24
9.5
V
V
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formulas:
LTC1438CG, LTC1439CG: T J = T A + (P D )(95 ° C/W)
LTC1439CGW: T J = T A + (P D )(85 ° C/W)
Note 3: The LTC1438 and LTC1439 are tested in a feedback loop which
servos V OSENSE1,2 to the balance point for the error amplifier
(V ITH1,2 = 1.19V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Oscillator frequency is tested by measuring the C OSC charge and
discharge current (I OSC ) and applying the formula:
f OSC (kHz) = 8.4(10 8 )[C OSC (pF) + 11] –1 (1/I CHG + 1/I DISC ) –1
Note 6: The auxiliary regulator is tested in a feedback loop which servos
V AUXFB to the balance point for the error amplifier. For applications with
V AUXDR > 9.5V, V AUXFB uses an internal resistive divider. See Applications
Information section.
Note 7: The LTC1439EG is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
14389fb
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