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MAX860

更新时间： 2024-10-01 22:55:11
品牌 Logo 应用领域
美信 - MAXIM 转换器开关
页数 文件大小 规格书
12页 144K
描述
50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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MAX860 数据手册

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19-0239; Rev 1; 11/96  
5 0 m A, Fre q u e n c y-S e le c t a b le ,  
S w it c h e d -Ca p a c it o r Vo lt a g e Co n ve rt e rs  
0/MAX861  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
♦ 8-Pin, 1.11mm High µMAX Package  
♦ Invert or Double the Input Supply Voltage  
♦ Three Selectable Switching Frequencies  
♦ High Frequency Reduces Capacitor Size  
♦ 87% Efficiency at 50mA  
The MAX860/MAX861 charge-pump voltage converters  
invert input voltages ranging from +1.5V to +5.5V, or  
double input voltages ranging from +2.5V to +5.5V.  
Because of their high switching frequencies, these  
devices use only two small, low-cost capacitors. Their  
50mA output makes switching regulators unnecessary,  
eliminating inductors and their associated cost, size,  
and EMI. Greater than 90% efficiency over most of the  
load-current range, combined with a typical operating  
current of only 200µA (MAX860), provides ideal perfor-  
mance for both battery-powered and board-level volt-  
age-conversion applications.  
♦ 200µA Quiescent Current (MAX860)  
♦ 1µA Shutdown Supply Current  
♦ 600mV Voltage Drop at 50mA Load  
♦ 12Ω Output Resistance  
A frequency-control (FC) pin provides three switching-  
frequencies to optimize capacitor size and quiescent  
current and to prevent interference with sensitive cir-  
cuitry. Each device has a unique set of three available  
———–  
frequencies. A shutdown (SHDN) pin reduces current  
consumption to less than 1µA. The MAX860/MAX861  
are suitable for use in applications where the ICL7660  
and MAX660's switching frequencies are too low. The  
MAX860/MAX861 a re a va ila b le in 8-p in µMAX a nd  
SO packages.  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
-25°C to +85°C  
-25°C to +85°C  
0°C to +70°C  
PIN-PACKAGE  
8 SO  
MAX860ISA  
MAX860IUA  
MAX860C/D  
MAX860ESA  
MAX860MJA  
MAX861ISA  
MAX861IUA  
MAX861C/D  
MAX861ESA  
MAX861MJA  
8 µMAX  
Dice*  
-40°C to +85°C  
-55°C to +125°C  
-25°C to +85°C  
-25°C to +85°C  
0°C to +70°C  
8 SO  
________________________Ap p lic a t io n s  
Portable Computers  
†
8 CERDIP  
8 SO  
Medical Instruments  
8 µMAX  
Dice*  
8 SO  
Interface Power Supplies  
Hand-Held Instruments  
-40°C to +85°C  
-55°C to +125°C  
Operational-Amplifier Power Supplies  
†
8 CERDIP  
* Dice are tested at T = +25°C, DC parameters only.  
A
† Contact factory for availability.  
__________Typ ic a l Op e ra t in g Circ u it  
INPUT  
VOLTAGE  
+1.5V TO +5.5V  
1
2
8
7
MAX860  
MAX861  
FC  
V
DD  
C1+  
SHDN  
__________________P in Co n fig u ra t io n  
3
4
6
5
GND  
C1-  
LV  
INVERTED  
NEGATIVE  
OUTPUT  
C1 10µF  
OUT  
TOP VIEW  
10µF  
C2  
VOLTAGE INVERTER  
FC  
C1+  
GND  
C1-  
V
DD  
1
2
3
4
8
7
6
5
INPUT  
SHDN  
LV  
VOLTAGE  
+2.5V TO +5.5V  
DOUBLED  
POSITIVE  
OUTPUT  
1
2
3
4
8
7
6
5
MAX860  
MAX861  
MAX860  
MAX861  
FC  
V
DD  
C1+  
GND  
C1-  
SHDN  
10µF  
C2  
OUT  
LV  
C1  
10µF  
SO/µMAX  
OUT  
POSITIVE VOLTAGE DOUBLER  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800  
1234567...12

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