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参数资料
| 型号： | MAX768EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWTCHD CAP DBL INV 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），倍增器，反相 |
| 输出类型： | 固定 |
| 输出数： | 2 |
| 输出电压： | ±11V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 25kHz，100kHz |
| 电流 - 输出： | 5mA |
| 同步整流器： | 无 |
| 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） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
Table 1. Shutdown-Control Logic
PSHDN
1
1
0
0
NSHDN
1
0
1
0
POUT
STATUS
Positive output active
Positive output active
Positive output inactive
Shutdown (low-power mode)
NOUT
STATUS
Negative output active
Negative output inactive
Negative output active
Shutdown (low-power mode)
SUPPLY
CURRENT
(mA)
0.8
0.7
0.3
0.0001
Table 2. Charge-Pump Capacitor Selection (Figure 2)
SYNC
FREQUENCY
CAPACITORS
INPUT
GND
IN
External Clock
(kHz)
25
100
20 to 240
C1, C2, C3, C4
10μF
2.2μF
C = 220μF/f (kHz)
C5, C6
10μF
C7
4.7μF
Shutdown
The MAX768 has two active-low, TTL logic-level shut-
down inputs: PSHDN and NSHDN . When both inputs
are pulled low, the MAX768 shuts down and the supply
current is reduced to 10μA max over temperature.
Pulling PSHDN low turns off the positive linear regula-
tor; the doubler charge pump remains active. Pulling
V IN
the NSHDN input low while PSHDN remains high turns
off the inverter charge pump, the negative linear regula-
tor, and the output-ready indicator (Table 1).
C2
C1-
GND
C2+
IN
C1
Capacitors
The overall dropout voltage is a function of the charge
pump’s output resistance and the voltage drop across
the linear regulator. The charge-pump output resistance
is a function of the switching frequency and the capaci-
C4
C2-
V-
NOUT
MAX768
C1+
V+
POUT
C3
C7
+5V
tor’s ESR value. Therefore, minimizing the charge-pump
SETN
SETP
capacitors’ ESR minimizes dropout voltage.
NSHDN
RDY
C5
R POUT = 84 + 8 ( C1 ESR ) + ( C3 ESR ) +
R NOUT = 84 + 8 ( C1 ESR ) + 4 ( C2 ESR ) +
2
f OSC C1
PSHDN
SYNC
TO
V IN
C6
(C4 ESR ) +
2
f OSC C1
+
1
f OSC C2
-5V
See Table 2 for capacitor selection. All capacitors
should be either surface-mount ceramic chip or tanta-
lum. External capacitor values may be adjusted to opti-
mize size, performance, and cost.
SEE TABLE 2 FOR CAPACITOR VALUES
Figure 2. MAX768 Standard Application Circuit
8
_______________________________________________________________________________________
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| MAX768EEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX769EEI | 功能描述:PMIC 解决方案 2-3 Cell Step-Up/Dwn 2-Way Pgr System IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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