HT7936B 반도체 회로 부품 판매점
White LED Step-up Charge Pump Converter
|
|
 Holtek Semiconductor |
HT7936A/HT7936B
White LED Step-up Charge Pump Converter
Features
· Input voltage range: 2.8V to VOUT
· Driving current: 110mA (HT7936A),
150mA (HT7936B)
· Fixed output voltage: 5V (HT7936A),
4.5V (HT7936B)
· Oscillator frequency: 1MHz
· Soft start function, current limit,
short circuit protection
· Small outline SOT23-6 package
Applications
· Cellular phones
· PDAs
· DSCs
· Handheld devices
· White LED display backlighting
General Description
The HT7936A and HT7936B are charge-pump type
DC-DC step-up converter devices, which can generate
regulated fixed output voltages of 5.0V and 4.5V. Their
high degree of functional integration requires only the
addition of three external capacitors, namely a flying ca-
pacitor and an input and output capacitor, to implement
a full step-up conversion function.
The devices have the additional benefit of an integrated
soft start function to reduce the level of in-rush current
during device power on. The operating voltage range is
from 2.8V to the full output voltage value, VOUT.
To meet the demands of today¢s power sensitive appli-
cations, the devices, have a very low standby current
value as well as the extra safety features of current limit
and short circuit protection. This range of device fea-
tures, supplied in 6-pin SOT-23-6 package type, will en-
sure that these device will find excellent use in a wide
range of DC-DC step-up converter applications.
Selection Table
Part No.
HT7936A
HT7936B
www.DataSheet4U.com
Output Voltage
5.0V
4.5V
Tolerance
±4%
±4%
Package
SOT23-6
SOT23-6
Rev 1.00
1 December 28, 2009
Block Diagram
HT7936A/HT7936B
VO UT
C + V IN C -
M1
M4
M2
S h o r t C ir c u it
P r o te c io n
M3
Pin Assignment
C o n tro l
GND
EN VREF
1M H z O S C
N o te : D u r in g o p e r a tio n th e fo llo w in g s e q u e n c e o c c u r s :
1 . M 1 , M 3 O n / M 2 , M 4 O ff
2 . M 2 , M 4 O n / M 1 , M 3 O ff
C + V IN C -
6 54
T o p V ie w
1 23
VO UT G ND EN
www.DataSheet4UP.cinomDescription
Pin No. Pin Name
Description
1
VOUT
Regulated Output Voltage. VOUT should be bypassed with a 1mF to 10mF low ESR
ceramic capacitor placed as close as possible to the pin for best performance.
2 GND Ground. This pin is the voltage reference for the regulator output voltage.
3 EN
Device On/Off Control
1: Enable
0: Disable
Pin must not be left floating.
4 C-
Capacitor Negative Pin. Flying capacitor negative terminal.
5 VIN
Input Supply Voltage. VIN should be bypassed with a 1mF to 10mF low ESR ceramic
capacitor.
6 C+
Capacitor Positive Pin. Flying capacitor positive terminal.
Rev 1.00
2 December 28, 2009
|
PDF 파일 내의 페이지 : 총 16 페이지
제조업체: Holtek Semiconductor
( holtek )
HT7936B led
데이터시트 다운로드 :
[ HT7936B.PDF ]
[ HT7936B 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
관련 데이터시트
HT7936A
White LED Step-up Charge Pump Converter - Holtek Semiconductor
HT7936B
White LED Step-up Charge Pump Converter - Holtek Semiconductor