HT7727A 반도체 회로 부품 판매점
PFM Step-up DC/DC Converter
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 Holtek Semiconductor |
HT77XXA
PFM Step-up DC/DC Converter
Features
· Low start-up voltage: 0.7V (Typ.)
· High efficiency: 85% (Typ.)
· High output voltage accuracy: ±2.5%
· Output voltage: 2.7V, 3.0V, 3.3V, 5.0V
· Ultra low supply current IDD: 5mA (Typ.)
· Low ripple and low noise
· Low shutdown current: 0.5mA (Typ.)
· TO-92, SOT-89, SOT-23 and SOT-25 package
Applications
· Palmtops/PDAs
· Portable communicators/Smartphones
· Cameras/Camcorders
· Battery-powered equipment
General Description
The HT77XXA series is a set of PFM step-up DC/DC
converter with high efficiency and low ripple. The series
features extremely low start-up voltage and high output
voltage accuracy. They require only three external com-
ponents to provide a fixed output voltage of 2.7V, 3.0V,
3.3V or 5.0V. CMOS technology ensures ultra low sup-
ply current and makes them ideal for battery-operated
applications powered from one or more cells.
The HT77XXA consists of an oscillator, a PFM control
circuit, a driver transistor, a reference voltage unit, and a
high speed comparator. They employ pulse frequency
modulation (PFM) for minimum supply current and rip-
ple at light output loading. These devices are available
in space saving TO-92, SOT-89, SOT-23 and SOT-25
packages. For SOT-25 package, it also build-in a chip
enable function to reduce power consumption during
shutdown mode.
Selection Table
Part No.
HT7727A
HT7730A
HT7733A
HT7750A
Output Voltage
2.7V
3.0V
3.3V
5.0V
Package
TO-92
SOT-89
SOT-23
SOT-25
Marking
HT77XXA (for TO-92)
HT77XXA# (for SOT-89)
77XXA# (for SOT-23)
77XXA# (for SOT-25)
Note: ²XX² stands for output voltages.
Only lead free devices are available. ²#² stands for lead free devices. For the TO-92 package, there will be a
²#² mark at the end of the date code.
Block Diagram
L X L X L im ite r O S C 2 0 0 k H z
VO UT
V re f
B u ffe r
P F M C o n tro l
C h ip E n a b le
CE
GND
Rev 1.10
1 September 26, 2007
HT77XXA
Pin Assignment
T O -9 2
S O T -8 9
H T77X X A
123
F r o n t V ie w
H T77X X A #
S O T -2 3
VO UT
3
T o p V ie w
77X X A #
S O T -2 5
LX
5
GND
4
T o p V ie w
77X X A #
T o p V ie w
G N D V O U T LX
1 23
G N D V O U T LX
12
G N D LX
1 23
CE VO UT NC
B o tto m V ie w
G N D V O U T LX
G N D LX
CE VO UT NC
Pin Description
TO-92
Pin No.
SOT-89
SOT-23
¾¾¾
223
¾¾¾
111
332
SOT-25
1
2
3
4
5
Pin Name
Description
CE
VOUT
NC
GND
LX
Chip enable pin, high active
DC/DC converter output monitoring pin
No connection
Ground pin
Switching pin
Absolute Maximum Ratings
Supply Voltage ..............................VSS-0.3V to VSS+7V
Operating Temperature ...........................-40°C to 85°C
Storage Temperature ............................-50°C to 125°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Thermal Information
Symbol
Parameter
Thermal Resistance
qJA
(Junction to Ambient)
(Assume no ambient airflow,
no heat sink)
PD Power Dissipation
Note: PD is measured at Ta= 25°C
Package
SOT-89
TO-92
SOT-23
SOT-25
SOT-89
TO-92
SOT-23
SOT-25
Max.
300
300
330
320
0.33
0.33
0.3
0.31
Unit
°C/W
°C/W
°C/W
°C/W
W
W
W
W
Rev 1.10
2 September 26, 2007
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( holtek )
HT7727A converter
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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
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PFM Step-up DC/DC Converter - Holtek Semiconductor
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PFM Step-up DC/DC Converter - Holtek Semiconductor