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参数资料
| 型号： | MAX1697REUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13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： | 6kHz ~ 21kHz |
| 电流 - 输出： | 60mA |
| 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 |
60mA, SOT23 Inverting Charge Pump
with Shutdown
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.
Cascading Devices
Two devices can be cascaded to produce an even
larger negative voltage (Figure 4). The unloaded output
voltage is normally -2 ? 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
nth cascaded circuit must not exceed the maximum
output current capability of the (n-1)th circuit to ensure
is the number of parallel devices. Figure 5 shows the
equation for calculating output resistance.
Combined Doubler/Inverter
In the circuit of Figure 6, capacitors C1 and C2 form the
inverter, while C3 and C4 form the doubler. C1 and C3
are the pump capacitors; C2 and C4 are the reservoir
capacitors. Because both the inverter and doubler use
part of the charge-pump circuit, loading either output
causes both outputs to decline toward GND. Make sure
the sum of the currents drawn from the two outputs
does not exceed 60mA.
Heavy Load Connected to a
Positive Supply
Under heavy loads, where a higher supply is sourcing
current into OUT, the OUT supply must not be pulled
above ground. Applications that sink heavy current into
OUT require a Schottky diode (1N5817) between GND
and OUT, with the anode connected to OUT (Figure 7).
proper startup.
Paralleling Devices
Layout and Grounding
Good layout is important, primarily for good noise per-
Paralleling multiple MAX1697s reduces the output resis-
tance. Each device requires its own pump capacitor
(C1), but the reservoir capacitor (C2) serves all devices
(Figure 5). Increase C2’s value by a factor of n , where n
Table 1. Low-ESR Capacitor Manufacturers
formance. To ensure good layout, mount all compo-
nents as close together as possible, keep traces short
to minimize parasitic inductance and capacitance, and
use a ground plane.
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 to Minimize
Output Resistance
Table 3. Capacitor Selection to Minimize
Capacitor Size
PART
MAX1697R
MAX1697S
MAX1697T
MAX1697U
FREQUENCY
(kHz)
12
35
125
250
CAPACITOR
(μF)
22
6.8
2.2
1
TYPICAL
R OUT ( Ω )
12
12
12
12
PART
MAX1697R
MAX1697S
MAX1697T
MAX1697U
FREQUENCY
(kHz)
12
35
125
250
CAPACITOR
(μF)
10
3.3
1
0.47
TYPICAL
R OUT ( Ω )
17
17
17
17
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相关代理商/技术参数 |
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|---|---|
| MAX1697SEUT | 制造商:Maxim Integrated Products 功能描述:60MA SOT23 INVERTING CHARGE PUMP WITH SHUTDOWN - Bulk |
| MAX1697SEUT#TG16 | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1697SEUT+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP INV -1.25V TO -5.5V 60MA 6PIN SOT-23 - Cut Tape Product |
| MAX1697SEUT+T | 功能描述:电荷泵 60mA Invert Charge Pump w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1697SEUT-T | 功能描述:电荷泵 60mA Invert Charge Pump w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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