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| 型号： | MAX868EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 10UMAX |
| 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -3.6 V ~ -11 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 频率 - 开关： | 270kHz ~ 630kHz |
| 电流 - 输出： | 30mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-µMAX |
19-1290; Rev 1; 2/98
Regulated, Adjustable -2x
Inverting Charge Pump
General Description
The MAX868 inverting charge pump provides a low-cost
and compact means of generating a regulated negative
voltage up to -2 x V IN from a positive input voltage
between 1.8V and 5.5V. It uses a pulse-frequency-
modulation (PFM) control scheme to generate the regulat-
ed negative output voltage. PFM operation is obtained
by gating the internal 450kHz oscillator on and off as
needed to maintain output voltage regulation. This
unique on-demand switching scheme gives the MAX868
excellent light-load efficiency without degrading its full-
load operation (up to 30mA), permitting smaller capaci-
tors to take advantage of the oscillator’s high switching
frequency.
The MAX868 requires no inductors; only four capacitors
are required to build a complete DC-DC converter.
Output voltage regulation is achieved by adding just two
resistors. The MAX868 comes in a 10-pin μMAX pack-
age, which is only 1.11mm high and occupies just half
____________________________Features
o Regulated Negative Output Voltage
(up to -2 x V IN )
o Ultra-Small, 10-Pin μMAX Package
o On-Demand Switching at up to 450kHz
o 30μA Quiescent Supply Current
o Requires Only Four Small External Capacitors
o 1.8V to 5.5V Input Voltage Range
o 0.1μA Logic-Controlled Shutdown
o Up to 30mA Output Current
Ordering Information
the board area of a standard 8-pin SO.
________________________Applications
PART
MAX868C/D
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
Dice*
Small LCD Panels
Cell Phones
Cordless Phones
Camcorders
Handy-Terminals, PDAs
MAX868EUB -40°C to +85°C
*Dice are tested at T A = +25°C.
10 μMAX
Medical Instruments
Battery-Operated Equipment
Configuration
V IN = 1.8V TO 5.5V
1 μ F
Typical Operating Circuit
TOP VIEW
SHDN
IN
MAX868
GND 1
10 FB
0.1 μ F
C1+
FB
OUT
C1-
2
3
MAX868
9
8
SHDN
C2+
C1-
V OUT = 0V TO -2 x V IN
PGND
C1+
4
5
7
6
IN
C2-
0.1 μ F
C2+
C2-
OUT
2.2 μ F
μ MAX
PGND
GND
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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