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参数资料
| 型号： | MAX1721EUT-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV SOT23-6 |
| 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），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -1.5 V ~ -5.5 V |
| 输入电压： | 1.5 V ~ 5.5 V |
| 频率 - 开关： | 60kHz ~ 200kHz |
| 电流 - 输出： | 25mA |
| 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： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-6 |
SOT23, Switched-Capacitor
Voltage Inverters with Shutdown
Flying Capacitor (C1)
Increasing the flying capacitor’s value reduces the out-
put resistance. Above a certain point, increasing C1’s
2
…
+V IN
2
capacitance has a negligible effect because the output
resistance becomes dominated by the internal switch
resistance and capacitor ESR.
C1
3
4
6
MAX1719
MAX1720
MAX1721
“1”
1
C1
3
4
6
MAX1719
MAX1720
MAX1721
“n”
1
V OUT
Output Capacitor (C2)
Increasing the output capacitor’s value reduces the
output ripple voltage. Decreasing its ESR reduces both
output resistance and ripple. Lower capacitance values
can be used with light loads if higher output ripple can
SHDN (MAX1719)
SHDN (MAX1720/
MAX1721)
5
…
C2
5
V OUT = -nV IN
C2
be tolerated. Use the following equation to calculate the
peak-to-peak ripple:
Figure 4. Cascading MAX1719s or MAX1720s or MAX1721s
V RIPPLE =
I OUT
2 × f OSC × C2
+ 2 × I OUT × ESR C2
to Increase Output Voltage
Cascading Devices
Two devices can be cascaded to produce an even
Input Bypass Capacitor (C3)
Bypass the incoming supply to reduce its AC impedance
and the impact of the MAX1719/MAX1720/MAX1721’s
switching noise. A bypass capacitor with a value equal
to that of C1 is recommended.
Voltage Inverter
The most common application for these devices is a
charge-pump voltage inverter (Figure 1). This applica-
tion requires only two external components—capacitors
C1 and C2—plus a bypass capacitor, if necessary.
Refer to the Capacitor Selection section for suggested
capacitor types.
Table 1. Low-ESR Capacitor Manufacturers
larger negative voltage (Figure 4). The unloaded output
voltage is normally -2 x V IN , but this is reduced slightly
by the output resistance of the first device multiplied by
the quiescent current of the second. When cascading
more than two devices, the output resistance rises dra-
matically. For applications requiring larger negative
voltages, see the MAX865 and MAX868 data sheets.
The maximum load current and startup current of the
n th cascaded circuit must not exceed the maximum
output current capability of the (n - 1) th circuit to ensure
proper startup.
PRODUCTION
METHOD
Surface-Mount
Tantalum
Surface-Mount
Ceramic
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
SERIES
TPS series
267 series
593D, 595D series
X7R
X7R
PHONE
803-946-0690
714-969-2491
603-224-1961
803-946-0690
714-969-2491
FAX
803-626-3123
714-960-6492
603-224-1430
803-626-3123
714-960-6492
Table 2. Capacitor Selection for Minimum Output Resistance or Capacitor Size
PART
MAX1720
MAX1719/MAX1721
f OSC
12kHz
125kHz
CAPACITORS TO MINIMIZE
OUTPUT RESISTANCE
(R O = 23 ? , TYP)
C1 = C2
10μF
1μF
CAPACITORS TO MINIMIZE SIZE
(R O = 40 ? , TYP)
C1 = C2
3.3μF
0.33μF
_______________________________________________________________________________________
7
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