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参数资料
| 型号： | LTC2902-2CGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SUPPLY QUAD 16-SSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 推挽式，图腾柱 |
| 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： | 0°C ~ 70°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) |
LTC2902
Programmable Quad Supply
Monitor with Adjustable Reset Timer
and Supply Tolerance
FEATURES
DESCRIPTIO
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Simultaneously Monitors Four Supplies
16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or ± Adjustable Voltage
Thresholds
Guaranteed Threshold Accuracy: ± 1.5% of Monitored
Voltage Over Temperature
Selectable Supply Tolerance: 5%, 7.5%,
10%, 12.5% Below Monitored Voltage
Low Supply Current: 43 μ A Typ
Adjustable Reset Time
RESET Disable Pin for Margining Applications
Open-Drain RST Output (LTC2902-1)
Push-Pull RST Output (LTC2902-2)
Individual Nondelayed Monitor Outputs for Each Supply
Power Supply Glitch Immunity
Guaranteed RESET for V CC ≥ 1V
The LTC ? 2902 is a programmable supply monitor for sys-
tems with up to four supply voltages. One of 16 preset or
adjustable voltage monitor combinations can be selected
using an external resistor divider connected to the pro-
gram pin. The preset voltage thresholds are digitally pro-
grammable to 5%, 7.5%, 10% or 12.5% below the nomi-
nal operating voltage, and are accurate to 1.5% over tem-
perature. All four voltage comparator outputs are con-
nected to separate pins for individual supply monitoring.
The reset delay time is adjustable using an external
capacitor. Tight voltage threshold accuracy and glitch
immunity ensure reliable reset operation without false
triggering. The RST output is guaranteed to be in the
correct state for V CC down to 1V and may be disabled
during supply margin testing. The LTC2902-1 features
an open-drain RST output, while the LTC2902-2 has a
Desktop and Notebook Computers
Multivoltage Systems
Telecom Equipment
Portable Battery-Powered Equipment
APPLICATIO S
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push-pull RST output.
The 43 μ A supply current makes the LTC2902 ideal for power
conscious systems and the part may be configured to
monitor less than four inputs. The LTC2902-1/LTC2902-2
are available in the 16-lead narrow SSOP package.
s
Network Servers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Quad Supply Monitor with Adjustable Tolerance (5V, 3.3V, 2.5V, 1.8V)
5V
3.3V
DC/DC
CONVERTER
2.5V
1.8V
SYSTEM
LOGIC
4
V1
3
V3
13
V4
COMP1
2
R3
10k
POWER
GOOD
COMP2
16
14
V2
COMP3
1
C1
0.1 μ F
C2
0.1 μ F
R1
59k
1%
R2
40.2k
1%
12
11
LTC2902-2
V REF
V PG
GND
10
COMP4
RST
RDIS
T0
T1
CRT
5
C RT
15
6
8
7
9
MARGIN
TOLERANCE = 5%
t RST = 216ms
47nF
2902 TA01
2902f
1
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