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参数资料
| 型号： | MAX1697UEUT#TG16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/13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： | 1.6 V ~ 5.5 V |
| 频率 - 开关： | 120kHz ~ 400kHz |
| 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
Typical Operating Characteristics (continued)
(Circuit of Figure 1, capacitors from Table 2, V IN = +5V, SHDN = IN, T A = +25°C, unless otherwise noted.)
500
450
400
350
300
MAX1697T
OUTPUT RIPPLE vs. CAPACITANCE
500
450
400
350
300
MAX1697U
OUTPUT RIPPLE vs. CAPACITANCE
250
V IN = +4.75V, V OUT = -4.0V
250
200
150
100
50
0
V IN = +3.15V, V OUT = -2.5V
V IN = +1.9V, V OUT = -1.5V
200
150
100
50
0
V IN = +4.75V, V OUT = -4.0V
V IN = +3.15V, V OUT = -2.5V
V IN = +1.9V, V OUT = -1.5V
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
CAPACITANCE ( μ F)
Pin Description
CAPACITANCE ( μ F)
PIN
NAME
FUNCTION
C1
1
2
3
OUT
IN
C1-
Inverting Charge-Pump Output
Power-Supply Voltage Input. Input
range is 1.5V to 5.5V.
Negative Terminal of the Flying
Capacitor
INPUT
1.5V to 5.5V
C3
ON
OFF
2
5
IN
SHDN
6 3
C1+ C1-
MAX1697
GND
OUT
1
R L
C2
NEGATIVE
OUTPUT
-1 ? V IN
4
5
GND
SHDN
Ground
Shutdown Input. Drive this pin high
for normal operation; drive it low for
shutdown mode. OUT is actively
4
TE: (
Figure 1. Typical Application Circuit
pulled to ground during shutdown.
6
C1+
Positive Terminal of the Flying
Capacitor
C2 is smaller than the voltage across C1, charge flows
from C1 to C2 until the voltage across C2 reaches
-V IN . The actual voltage at the output is more positive
I OUT OUT ?
? xR
η?
? 1 ?
?
Detailed Description
The MAX1697 capacitive charge pumps invert the volt-
age applied to their input. For highest performance, use
low equivalent series resistance (ESR) capacitors (e.g.,
ceramic).
During the first half-cycle, switches S2 and S4 open,
switches S1 and S3 close, and capacitor C1 charges to
the voltage at IN (Figure 2). During the second half-
cycle, S1 and S3 open, S2 and S4 close, and C1 is level
shifted downward by V IN volts. This connects C1 in par-
allel with the reservoir capacitor C2. If the voltage across
than -V IN , since switches S1–S4 have resistance and the
load drains charge from C2.
Efficiency Considerations
The efficiency of the MAX1697 is dominated by its qui-
escent supply current (I Q ) at low output current and by
its output impedance (R OUT ) at higher output current; it
is given by:
I OUT
I OUT + I Q ? V IN ?
_______________________________________________________________________________________
7
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