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参数资料
| 型号： | DS1259S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/5页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGER 16-SOIC |
| 标准包装： | 1,000 |
| 功能： | 电源管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
DS1259
OPERATION
During normal operation, V CCI (Pins 15 and 16) is the primary energy source and power is supplied to
V CCO (Pins 12 and 13) through an internal switch at a voltage level of V CCI -0.2 volts at 250 mA. During
this time the power-fail signal ( PF ) is held high, indicating valid V CCI voltage (see Figure 1). However, if
the V CCI falls below the trip point (V TP ), a level of 1.26 times the battery level (V BAT ), the power-fail
signal is driven low. As V CCI falls below the battery level, power is switched from V CCI to V BAT and the
battery supplies power to the uninterruptible output (V CCO ) at V BAT -0.2 volts at 15 mA.
On power-up, as the V CCI supply rises above the battery, the primary energy source, V CCI , becomes the
supply. As V CCI rises above the trip point (V TP ), the power fail signal is driven back to the high level.
During normal operation, BAT (Pin 5) stays at the battery level regardless of the level of V CCI .
BATTERY FAIL
When power is being supplied from the primary energy source, BF (Pin 3) is held at a high level,
provided that the attached battery (V BAT ) is greater than 2 volts. If the battery level should decrease to
below 2 volts, the BF signal is driven low, indicating a low battery. The BF signal is always low when
the PF signal is low.
RESET
The reset input can be used to prevent the battery from supplying power to V CCO and BAT even if V CCI
falls below the level of the battery. This feature is activated by applying a pulsed input on RST to high
level for 50ns minimum while primary power is valid (see Figure 2). When primary power is removed
after pulsing RST, the V CCO output and BAT will go to high impedance. The next time primary power is
applied such that V CCI is greater than V BAT , normal operation resumes and V CCO will be supplied by the
battery or V CCI . The BAT output will also return to the level of the battery. Figure 3 shows the DS1259 in
a typical application.
BLOCK DIAGRAM Figure 1
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