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| 型号： | MAX1680ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 125MA 8SOIC |
| 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 |
| 输出数： | 1 |
| 输入电压： | 2 V ~ 5.5 V |
| 频率 - 开关： | 125kHz，250kHz |
| 电流 - 输出： | 125mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
Operating Frequency Trade-Offs
It is important to recognize the trade-offs between
switching frequency, power consumption, noise, cost,
and performance. Higher frequency switching reduces
capacitor size while maintaining the same output
impedance, thus saving capacitor cost and board
space. Lower frequency designs use less supply cur-
rent. Table 2 summarizes the relative trade-offs.
Table 2. Switching-Frequency Trade-Offs
resistance is a critical circuit component, as it deter-
mines the voltage drop that will occur at the output from
the ideal value of -V INPUT (or 2V INPUT when doubling).
To optimize performance, minimize overall resistance in
the system. In particular, equivalent series resistance
(ESR) in the capacitors produces significant losses as
large currents flow through them. Therefore, choose a
low-ESR capacitor for highest efficiency. Table 3 lists
recommended capacitors and their suppliers.
Calculate the output ripple voltage as follows:
ATTRIBUTE
Output Ripple
C1, C2 Values
Supply Current
LOWER
FREQUENCY
Larger
Larger
Smaller
HIGHER
FREQUENCY
Smaller
Smaller
Larger
V RIPPLE = [(I OUT ) / (2 x f OSC x C2)] + 2 x (I OUT x ESR C2 )
where I OUT is the load current, f S is the charge pump’s
operating frequency, C2 is the output capacitor, and
ESR C2 is the output capacitor’s ESR.
Table 4 lists the minimum recommended capacitances
that allow for the maximum output current. The output
Capacitor Selection
The MAX1680/MAX1681 are tested with capacitor val-
ues of 10μF and 2.2μF, respectively. Capacitor size
and switching speed determine output resistance.
Larger C1 values decrease the output resistance until
the internal switch resistance (3.5 ? typ) becomes the
dominant term. Low-ESR capacitors minimize output
resistance and ripple voltage. The entire circuit’s output
resistance can be approximated by the following equa-
tion:
R OUT ? R O + 4 x ESR C1 + ESR C2 + [1 / (f OSC x C1)] +
[1 / (f OSC x C2)]
where R O is the device’s internal effective switch resis-
tance and f OSC is the switching frequency. Output
Table 3. Low-ESR Capacitor Suppliers
capacitor, C2, is normally equal to or greater than the
charge-pump capacitor, C1. Capacitor values can be
scaled directly proportional to the input voltage, fre-
quency, and load current. For example, for V INPUT =
5V, I LOAD = 125mA at f OSC = 125kHz, a 6.4μF mini-
mum capacitor is recommended. For an output of only
62.5mA, a 3.2μF capacitor is recommended. C1’s value
can be estimated as follows:
C1 = 6.4μF x (V INPUT / 5.0V) x (125kHz / f OSC ) x
(I LOAD / 125mA)
where f OSC is the switching frequency (kHz) and I LOAD
is the output current (mA) required.
SUPPLIER
AVX
Marcon/United Chemi-Con
Matsuo
Nichicon
Sanyo
Sprague
TDK
United Chemi-Con
Vishay/Vitramon
PHONE
(803) 946-0690
(800) 282-4975
(847) 696-2000
(714) 969-2491
USA: (847) 843-7500
Japan: 81-7-5231-8461
USA: (619) 661-6835
Japan: 81-7-2070-6306
(603) 224-1961
(847) 390-4373
(714) 255-9500
(203) 268-6261
FAX
(803) 626-3123
(847) 696-9278
(714) 960-6492
USA: (847) 843-2798
Japan: 81-7-5256-4158
USA: (619) 661-1055
Japan: 81-7-2070-1174
(603) 224-1430
(847) 390-4428
(714) 255-9400
(203) 452-5670
DEVICE TYPE
Surface mount, TPS series
Ceramic capacitors
Surface mount, 267 series
Through-hole, PL series
Through-hole, OS-CON series
Surface mount, 595D series
Ceramic capacitors
Through-hole, LXF series
SMT ceramic chip capacitors
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