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| 型号： | LTC1704EGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/28页 |
| 文件大小： | 347K |
| 描述： | IC REG DL BUCK/LINEAR 16SSOP |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 550kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 3.15 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1704EGNTR |
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LTC1704/LTC1704B
3
1704bfa
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25?/SPAN>C.
V
CC
= PV
CC
= BOOST = 5V, unless otherwise specified. (Note 3)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1704E is guaranteed to meet performance specifications
from 0癈 to 70癈. Specifications over the 40癈 to 85癈 operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: PV
CC
and BV
CC
(V
BOOST
V
SW
) must be greater than V
GS(ON)
of
the external MOSFETs to ensure proper operation.
Note 5: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with supply voltage and the external MOSFETs used.
Note 6: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1704, especially at elevated temperature.
Note 7: Guaranteed by design, not subject to test.
Note 8: Rise and fall times are measured using 10% and 90% levels. Delay
and nonoverlap times are measured using 50% levels.
Note 9: Dropout voltage is the minimum V
CC
to V
REGDR
voltage differential
required to maintain regulation at the specified driver output current.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Switcher Switching Characteristics
f
OSC
Oscillator Frequency
Test Circuit
q 460 550 650 kHz
DC
MAX
Maximum Duty Cycle
q 87 90 93
%
t
NOV
Driver Nonoverlap
Test Circuit (Note 8)
q 10 25 120
ns
t
r
, t
f
Driver Rise/Fall Time
Test Circuit (Note 8)
q
15 100
ns
Linear Regulator Controller
V
REGFB
Feedback Voltage
Test Circuit, R
REGILM
= 680k
0.784 0.800 0.816
V
q 0.780 0.800 0.820
V
I
REGFB
REGFB Input Current
q
?
礎
dV
REGFB
Feedback Voltage Line Regulation
Test Circuit, V
CC
= 4.5V to 5.5V
q
?.05 ?.2 %/V
Feedback Voltage Load Regulation
Test Circuit, I
REGDR
= 0mA to 30mA
q 0.2 0.05
%
I
REGDR
Driver Output Current
Test Circuit
q 30
mA
R
REGILM
= 680k, V
REGFB
= 0.76V, V
REGDR
= 3.3V
20
mA
R
REGILM
= 680k, V
REGFB
= 0V, V
REGDR
= 1V
6
mA
V
DROPOUT
Driver Dropout Voltage
Test Circuit, I
REGDR
= 30mA, V
REGDR
= 3.3V, q
0.65 1.1
V
dV
REGFB
= 1% (Note 9)
V
REGILM
REGILM Threshold
Test Circuit, R
REGILM
= 680k
0.8
V
I
REGILMINT
REGILM Internal Pull-Up Current
V
REGILM
= 0V
1.9
礎
V
PGOOD
Negative REGFB Power Good Threshold
q 15 10 6
%
Positive REGFB Power Good Threshold
q 6 10 15
%
PGOOD
I
PGOOD
V
PGOOD
Sink Current
Power Good
q
10
礎
Power Bad
q 10
mA
V
OLPG
V
PGOOD
Output Low Voltage
I
PGOOD
= 1mA
q
0.03 0.1
V
t
PGOOD
V
PGOOD
Falling Edge Delay
(Note 8)
q 0.5 1
4
祍
V
PGOOD
Rising Edge Delay
(Note 8)
q 10 20 40
祍
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