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| 型号： | MAX868EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/12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 |
Regulated, Adjustable -2x
Inverting Charge Pump
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
GND
OUT
C1-
PGND
C1+
C2-
IN
C2+
SHDN
FB
FUNCTION
Analog Ground
Charge-Pump Output
Negative Terminal of Flying Capacitor C1
Power Ground
Positive Terminal of Flying Capacitor C1
Negative Terminal of Flying Capacitor C2
Supply-Voltage Input. Input voltage range is 1.8V to 5.5V.
Positive Terminal of Flying Capacitor C2
Active-Low Shutdown Input. Connect SHDN to GND to put the MAX868 in shutdown mode and reduce sup-
ply current to 0.1μA. Connect to IN for normal operation. OUT is actively pulled to GND in shutdown.
Feedback Input. Connect FB to a resistor divider for a regulated output voltage. Connect to IN to generate
an unregulated -2 x V IN output voltage.
Detailed Description
The MAX868 inverting charge pump uses pulse-
frequency-modulation (PFM) control to generate a reg-
ulated negative output voltage up to -2 x V IN . PFM
operation is obtained by enabling the internal 450kHz
oscillator as needed to maintain output voltage regula-
tion. This control scheme reduces supply current at
light loads and permits the use of small capacitors.
IN
C2+
C2-
The functional diagram shown in Figure 1 indicates the
two phases of MAX868 operation: charge phase ( Φ 1)
and discharge phase ( Φ 2). In charge phase, the
switches on the left-hand side close, and the switches
on the right-hand side open. In the discharge phase,
C1+
C1-
OUT
the inverse occurs.
Φ 1
Φ 2
Figure 2 illustrates that in charge phase, both flying
FB
C OUT
capacitors are charged in parallel. The load is serviced
entirely by the charge stored in the output capacitor.
Figure 3 demonstrates the series connection of the fly-
ing capacitors in the discharge phase. The series com-
bination of the flying capacitors, when connected to the
output capacitor, transfers charge to the output in order
to maintain output voltage regulation. In normal opera-
tion, the MAX868 operates predominantly in charge
SHDN
OSCILLATOR
V REF
phase, switching to discharge phase only as needed to
maintain a regulated output.
Figure 1. Functional Diagram
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