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参数资料
| 型号： | MAX1259CWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGER 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 功能： | 备份管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 4.5 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) |
Battery Manager
V CCI
+4.25V
+3V
PF
t F
t PF
t R
t REC
BATTERY
CURRENT
Figure 1. Power-Down/Power-Up Conditions
Detailed Description
Battery Switchover and V CCO
Figure 2 shows a typical application for the MAX1259.
CMOS RAM is powered from V CCO . The battery
switchover circuit compares V CC to the V BATT input,
and connects V CCO to whichever is higher.
Switchover occurs when V CC equals V BATT as V CC
falls, and when V CC is 60mV greater than V BATT as
V CC rises. This hysteresis prevents repeated, rapid
switching if V CC falls very slowly or remains nearly
equal to the battery voltage. Low-loss switches guaran-
tee an input-to-output differential of only 200mV, while
supplying 250mA from the primary power supply or
15mA from the battery.
Note: With adequate filtering, the MAX1259 need only
supply the average current drawn by the CMOS RAM.
Many RAM data sheets specify a 75mA maximum sup-
ply current, but this peak current spike lasts only 100ns.
If the sum of the peak currents is greater than 250mA, a
capacitor placed on the V CCO output can supply the
high instantaneous current, while V CCO need only sup-
ply the average current, which is much less.
The MAX1259 operates with battery voltages from 2.5V
to 3.7V. High-value capacitors—either standard elec-
trolytic or farad-sized, double-layer capacitors—can
also be used for short-term memory backup (Figure 3).
V CC
15, 16
V CCI
V CC0
12, 13
TO RAM
RAM16
RAM1
RAM2
CE15
3k Ω
MAX1259
V CC
15, 16
V CCI
V CCO
12, 13
CE0
CE1
2N3904
2
V BATT
2
MAX1259
V BATT
PF
11
NMI
ADDRESS
DECODE
6.2k Ω
0.22F
MAXCAP
GND
7, 8
GND
7, 8
Figure 2. Typical Application Circuit
μ P
NOTE: LARGE VALUE CAPACITORS, SUCH AS A 0.22F MAXCAP,
MAY BE USED FOR SHORT-TERM MEMORY BACKUP.
Figure 3. Using a MAXCAP as a Backup Battery
_______________________________________________________________________________________
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1259EPE | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1259EPE+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1259EWE | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1259EWE+ | 功能描述:电池管理 Battery Manager RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1259EWE+T | 功能描述:电池管理 Battery Manager RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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