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参数资料
| 型号： | LTC2901-3IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR QUAD SUPP PROG 16SSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 5 ms |
| 电压 - 阀值： | 16 种可选阀值组合 |
| 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) |
LTC2901
APPLICATIO S I FOR ATIO
Monitoring Power Supply Controller Activity
Figure 7 demonstrates how the LTC2901 can be used to
monitor switcher activity. The monitor is configured to
supervise 3.3V, 2.5V, 1.8V and one adjustable input.
Because 2.5V does not exist in this application, the V2
input is tied to the V1 (3.3V) input. The feedback voltage
on the LTC1772 (0.8V typ) is monitored with the adjust-
able input (V4). The RST pin will go high 216ms
(C RT = 47nF) after the 3.3V and 1.8V supplies and the
feedback voltage are above threshold. Individual input
status is available at the COMPX pins.
While the voltage monitors can detect low voltage or
shorted inputs, the watchdog circuit can be used to detect
an open circuit to the primary load. With the CWT pin
unconnected, the watchdog time-out is approximately
200 μ s. At low load currents on the 1.8V supply, the
LTC1772 will go into Burst Mode ? operation. With an
open-ciruit load, the duty cycle at the gate of M1 will drop,
and the pulse spacing will exceed the watchdog time-out
period. The WDO pin will go low indicating the low load
condition. The WDO pin will return high on the next pulse
to the gate of M1. The WDO pin will remain high if the load
is restored.
Ensuring Reset Valid for V CC Down to 0V
(LTC2901-2/LTC2901-4)
Some applications require the reset output (RST) to be
valid with V CC down to 0V. The LTC2901-2 is designed to
handle this requirement with the addition of an external
resistor from RST to ground. The resistor will provide a
path for stray charge and/or leakage currents, preventing
the RST output from floating to undetermined voltages
when connected to high impedance (such as CMOS logic
inputs). The resistor value should be small enough to
provide effective pull-down without excessively loading
the active pull-up circuitry. Too large a value may not pull
down well enough. A 100k resistor from RST to ground is
satisfactory for most applications.
Burst Mode is a registered trademark of Linear Technology Corporation.
SENSE –
LTC1772
1 6
I TH PGATE
R6 2 5
10k GND V IN
3 4
C3 V FB
220pF
C1: TAIYO YUDEN CERAMIC LMK325BJ106K-T
C2: SANYO POSCAP 6TPA47M
D1: MOTOROLA MBRM120T3
L1: COILTRONICS UP1B-100
R5
0.15 Ω
M1 L1
10 μ H
D1
+
C1
10 μ F
10V
C2
47 μ F
6V
R3
100k
R4
80.6k
V IN
3.3V
V OUT
1.8V
0.5A
R1
28k
1%
R2
71.5k
1%
4
14
3
13
8
12
11
10
LTC2901-2
V1 COMP1
V2 COMP2
V3 COMP3
V4 COMP4
WDI RST
V REF WDO
V PG CRT
GND CWT
2
16
1
15
6
7
5
9
3.3V MONITOR
1.8V MONITOR
FEEDBACK MONITOR
COMMON RESET OUT
LOW LOAD INDICATOR
C RT
47nF
M1: Si3443DV
R5: DALE 0.25W
2901 F07
Figure 7. Monitor Input, Output, Feedback Voltage and Low Load Conditions on DC/DC Controller
2901fb
14
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