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參數(shù)資料
| 型號(hào)： | MAX1759 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320C6410 : Digital Signal Processor 100-LQFP |
| 中文描述： | Buck/boost穩(wěn)壓電荷泵，µMAX封裝 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 191K |
| 代理商： | MAX1759 |
M
Buck/Boost Regulating
Charge Pump in μMAX
8
_______________________________________________________________________________________
Capacitor Selection
Optimize the charge-pump circuit for physical size, out-
put current, and output ripple by selecting capacitors
C
IN
, C
X
, and C
OUT
. See Table 1 for suggested capacitor
values.
Note that capacitors must have low ESR (
≤
20m
) to
maintain low output ripple. Ceramic capacitors are
recommended. In cost-sensitive applications where high
output current is needed, the output capacitor may be a
combination of a 1μF ceramic in parallel with a 10μF tan-
talum capacitor. The ceramic capacitor’s low ESR will
help keep output ripple within acceptable levels.
Output Voltage Ripple
The MAX1759 proprietary control scheme automatically
chooses between voltage doubling and voltage step-
down to maintain output voltage regulation over various
load currents and V
IN
to V
OUT
voltage differentials.
When V
IN
is lower than V
OUT
, the charge pump always
operates in voltage-doubler mode. It regulates the output
voltage by modulating the charge delivered by the
transfer capacitor.
When V
IN
is higher than V
OUT
, the charge pump oper-
ates in voltage step-down mode, but may revert to volt-
age-doubler mode if necessary to maintain regulation
under load. While operating in step-down mode, the
output voltage ripple is typically much lower than it is in
voltage-doubler mode (see
Typical Operating
Characteristics
).
Output Current
The MAX1759 is guaranteed to deliver a regulated 3.3V
at 100mA continuous, from a +2.5V input. Peaks up to
200mA are acceptable as long as the current is
≤
100mA (RMS).
Applications Information
PC Board Layout
The MAX1759 is a high-frequency switched-capacitor
voltage regulator. For best circuit performance, use a
ground plane and keep C
IN
, C
X
, C
OUT
, and feedback
resistors (if used) close to the device. If using external
feedback, keep the feedback node as small as possi-
ble by positioning the feedback resistors very close to
FB. Suggested PC component placement and board
layout are shown in Figures 4a and 4b.
Chip Information
TRANSISTOR COUNT: 1802
0.33
μ
F
V
IN
= 1.6V TO 5.5V
10
μ
F
10
μ
F
100k
V
OUT
= 2.5V
R1
76.8k
R2
75k
FB
PGND
GND
SHDN
IN
CXN
CXP
OUT
POK
MAX1759
Figure 3. Using External Feedback for Regulated 2.5V Output
Table 1. Capacitor Selection
OUTPUT
CURRENT
(mA)
100
100
50
2.2
4.7
10
C
IN
(μF)
CAPACITOR VALUE
OUTPUT RIPPLE
(mV)
C
X
(μF)
0.33
0.22
0.1
2.2
4.7
10
C
OUT
(μF)
V
IN
=
2.5V
40
80
100
80
60
20
V
IN
=
4.2V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1759EUB | Buck/Boost Regulating Charge Pump in レMAX |
| MAX1760EUB | 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter |
| MAX1761 | Small, Dual, High-Efficiency Buck Controller for Notebooks |
| MAX1761EEE | Replaced by TMS320VC5506 : Digital Signal Processor 100-LQFP |
| MAX1763 | 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter |
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參數(shù)描述 |
|---|---|
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| MAX17595ATE+T | 功能描述:電流型 PWM 控制器 AC/DC-DC/DC Peak Current-Mode Cnvrtr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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| MAX17596ATE+T | 功能描述:電流型 PWM 控制器 AC/DC-DC/DC Peak Current-Mode Cnvrtr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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