2039年The TCS5420 is available in the industry The TCS5420 have thermal shutdown capability capacitors at VIN and VOUT) make the TCS5420 The TCS5420 is a low noi, constant frequency
卡通男生q版F e a t u r e s
Fixed 5V ± 4% Output VIN Range: 2.8V to 4.5V
Output Current: Up to 100mA （VIN ≥2.8V ）
Up to 250mA （VIN ≥3.6V ） Constant Frequency Operation at All Loads Low Noi Constant Frequency (400kHz) Operation
Automatic Soft-Start Reduces Inrush Current
小绿豆
Shutdown Current <1µA Short-Circuit Protection No Inductors
Available in Low Profile 6-Lead SOT23 Package
A p p l i c a t i o n s
White LED Backlighting Li-Ion Battery Backup Supplies Local 3V to 5V Conversion Smart Card Readers D e s c r i p t i o n
(400kHz) switched capacitor voltage doubler. It produce a regulated output voltage from a 2.8V to 4.5V input. Low external parts count (one flying capacitor and two small bypass ideally suited for small, battery-powered applications.
and can survive a continuous short circuit from VOUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up.
High switching frequency enables the u of small ceramic capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1uA. standard SOT-23-6L power packages.
PCMCIA Local 5V Supplies
The TCS5420 are guaranteed to meet performance speci
秘密倒数
养草金鱼最怕什么
T y p i c a l
A p p l i c a t i o n s
Figure 1: Regulated 5V Output
P i n D e s c r i p t i o n
Top View
SOT-23-6L
A b s o l u t e M a x i m u m R a t i n g s (Note 1)
V IN ……………………………….…………………………….…….….…..….………- 0.3V to 6V V OUT …
……………………………………………………………………………….….- 0.3V to 5.5V VOUT Short-circuit Duration.…………………………………………..….………………indefinite V EN ……………………………………………………...…………………….…...……- 0.3V to 6V IOUT (Note 2) …………………….................................………………………...................... 300mA Operating Temperature Range (Note 3)……………………………………………...……- 30℃ to 85℃ Lead Temperature (Soldering 10 c.) ……………………………………..………………300℃ Storage Temperature Range ………………………………………………..…..- 65℃ to 125℃
Note 1: Absolute Maximum Ratings are tho values beyond which the life of a device may be impaired. Note 2: Bad on long term current density limitations. Note 3: fications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls.
PIN NUMBER SOT-23-6L
PIN NAME 1 VOUT 2 GND 3 EN 4 C- 5 VIN 6
C+
Low Noi, Regulated Charge Pump DC/DC Converter
E l e c t r i c a l C h a r a c t e r i s t i c s
The specifications are at TA = 25 ℃. EN= V IN , C IN =C OUT =10uF unless otherwi noted.
＊ EFFI = [(Output Voltage × Output Current) / (Input Voltage × Input Current)] × 100%上吊死
T y p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s
TA=25℃, EN= V IN , C IN =10uF, C OUT =10uF, C FLY =10uF, unless otherwi noted.
PARAMETER
C O N
D I T I O N S MIN TYP MAX UNITS
Input Voltage Range (V IN )
2.7
5 V Output Voltage Range (V OUT ) 2.7V <V IN < 5.5V, I OUT < 65mA
4.7
5 5.2
V I SHDN Shutdown Current EN=0V,V OUT = 0V 0.3 µA No Load Input Current I OUT = 0mA, V IN = 2.8V 0.65
田佑
mA Output Ripple (VR) V IN = 2.8V , I OUT = 100mA 150
mVP-P
Efficiency
V IN = 2.8V, I OUT =100mA
81 % Switching Frequency ( f
osc )
400
kHz
Low Noi, Regulated Charge Pump DC/DC Converter
Low Noi, Regulated Charge Pump DC/DC Converter秦良玉
Low Noi, Regulated Charge Pump DC/DC Converter P i n F u n c t i o n s
VOUT (Pin 1): Regulated Output Voltage. VOUT should be bypasd with a low ESR ceramic capacitor providing at least 2.2µF of capacitance as clo to the pin as possible for best performance.
GND (Pin 2): Ground. The pins should be tied to a ground plane for best performance.
EN (Pin 3): Active Low Shutdown Input. This pin must not be allowed to float.
C- (Pin 4): Flying Capacitor Negative Terminal.
VIN (Pin 5): Input Supply Voltage. VIN should be bypasd with a low ESR ceramic capacitor providing
at least 2.2µF of capacitance as clo to the pin as possible for best performance.
C+ (Pin 6): Flying Capacitor Positive Terminal.
B l o c k D i a g r a m
