- 您现在的位置：买卖IC网 > PDF目录13581 > MAX1852EXT+T (Maxim Integrated Products)IC REG SWITCHED CAP INV SC70-6 PDF资料下载
参数资料
| 型号： | MAX1852EXT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV SC70-6 |
| 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： | -2.5 V ~ -5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 50kHz |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SC-70-6 |
SC70 Inverting Charge Pumps
with Shutdown
Pin Description
C1
PIN
NAME
FUNCTION
1
OUT
Inverting Charge-Pump Output
INPUT
2.5V TO 5.5V
4
IN
6
C1+
5
C1-
OUT
1
NEGATIVE
OUTPUT
2
3
GND
SHDN
Ground
Shutdown Input. Drive this pin high
for normal operation; drive it low for
shutdown mode.
C3
ON
OFF
3
SHDN
MAX1852
MAX1853
GND
R L
C2
-1 ? V IN
4
IN
Power-Supply Voltage Input. Input
range is +2.5V to +5.5V.
TE: (
2
5
6
C1-
C1+
Negative Terminal of the Flying
Capacitor
Positive Terminal of the Flying
Capacitor
Figure 1. Typical Application Circuit
I OUT x R OUT ?
?
η?
? 1 ?
?
Detailed Description
The MAX1852/MAX1853 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
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
than -V IN since switches S1 – S4 have resistance and the
load drains charge from C2.
Efficiency Considerations
The efficiency of the MAX1852/MAX1853 is dominated
by their quiescent supply current (I Q ) at low output cur-
rent and by their output impedance (R OUT ) at higher
output current; it is given by:
I OUT
I OUT + I Q ? V IN ?
where the output impedance is roughly approximated
by:
resistances (typically 6 ? at V IN = +5V). The typical out-
put impedance is more accurately determined from the
Typical Operating Characteristics .
Shutdown
The MAX1852/MAX1853 have a logic-controlled shut-
down input. Driving SHDN low places the devices in a
low-power shutdown mode. The charge-pump switch-
ing halts, supply current is reduced to 2nA.
Driving SHDN high will restart the charge pump. The
switching frequency and capacitor values determine how
soon the device will reach 90% of the input voltage.
Applications Information
Capacitor Selection
The charge-pump output resistance is a function of the
ESR of C1 and C2. To maintain the lowest output resis-
tance, use capacitors with low ESR. (See Table 1 for a
list of recommended manufacturers.) Tables 2 and 3
suggest capacitor values for minimizing output resis-
tance or capacitor size.
Flying Capacitor (C1)
Increasing the flying capacitor ’ s value reduces the out-
put resistance. Above a certain point, increasing C1 ’ s
capacitance has negligible effect because the output
resistance is then dominated by internal switch resis-
tance and capacitor ESR.
Output Capacitor (C2)
( )
R OUT ?
1
f OSC x C1
+ 2R SW + 4ESR C1 + ESR C2
Increasing the output capacitor ’ s value reduces the
output ripple voltage. Decreasing its ESR reduces both
output resistance and ripple. Lower capacitance values
The first term is the effective resistance of an ideal
switched-capacitor circuit (Figures 3a and 3b), and
R SW is the sum of the charge pump ’ s internal switch
can be used with light loads if higher output ripple can
be tolerated. Use the following equation to calculate the
peak-to-peak ripple:
_______________________________________________________________________________________
5
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1721EUT+T | IC REG SWITCHED CAP INV SOT23-6 |
| EL7563CREZ-T13 | IC REG BUCK SYNC ADJ 4A 28HTSSOP |
| EL7563CREZ-T7 | IC REG BUCK SYNC ADJ 4A 28HTSSOP |
| VE-24L-EX-F1 | CONVERTER MOD DC/DC 28V 75W |
| GBC43DCAH-S189 | CONN EDGECARD 86POS R/A .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1853EXT | 制造商:Maxim Integrated Products 功能描述:SC70 200KHZ INVERTING CHARGE PUMP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX1853EXT+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP INV -2.5V TO -5.5V 30MA 6PIN SC-70 - Rail/Tube |
| MAX1853EXT+T | 功能描述:电荷泵 Inverting w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1853EXT-T | 功能描述:电荷泵 Inverting w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1854EEG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。