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PDF HT7718 Data sheet ( Hoja de datos )
| Número de pieza | HT7718 | |
| Descripción | PFM Step-up DC/DC Converter | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT7718 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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HT77XXwww.DataSheet4U.com
PFM Step-up DC/DC Converter
Features
· Low start-up voltage: 0.7V (Typ.), 0.9V (Max.)
· High efficiency: 85% (Typ.), VOUT³2.7V
· High output voltage accuracy: ±2.5%
· Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V
· Ultra low supply current IDD2: 4mA (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 HT77XX series is a set of PFM step-up DC/DC con-
verter with high efficiency and low ripple. The series fea-
tures extremely low start-up voltage and high output
voltage accuracy. They require only three external com-
ponents to provide a fixed output voltage of 1.8V, 2.7V,
3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ul-
tra low supply current and makes them ideal for bat-
tery-operated applications powered from one or more
cells.
The HT77XX consists of an oscillator, a PFM control cir-
cuit, 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.
HT7718
HT7727
HT7730
HT7733
HT7737
HT7750
Output Voltage
1.8V
2.7V
3.0V
3.3V
3.7V
5.0V
Package
TO-92
SOT-89
SOT-23
SOT-25
Marking
HT77XX (for TO-92)
HT77XX# (for SOT-89)
77XX# (for SOT-23)
77XX# (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
LX
VO UT
V re f
B u ffe r
P F M C o n tro l
O S C 115kH z
C h ip E n a b le
GND
CE
Rev 1.60
1 September 12, 2007
1 page  
3 .0 2
3 .0 0
2 .9 8
2 .9 6
2 .9 4
2 .9 2
2 .9 0
2 .8 8
2 .8 6
2 .8 4
2 .8 2
2 .8 0
0
V IN = 1 .2 V
V IN = 2 .0 V
V IN = 1 .8 V
V IN = 1 .5 V
20 40 60 80 100 120 140
O u tp u t C u rre n t (m A )
HT7730 Output Voltage v.s Output Current
85
V IN = 2 .0 V
80
V IN = 1 .8 V
75
V IN = 1 .5 V
70
65
V IN = 1 .2 V
60
55
50
0
20 40 60
80 100 120 140
O u tp u t C u rre n t (m A )
HT7730 Efficiency v.s Output Current
1 .1
1 .0
0 .9 S ta rt u p
0 .8
0 .7
0 .6
0 .5
H o ld o n
0 .4
0 .3
0 .2
0 .1
0 .0
0 2 4 6 8 10 12 14 16 18 20
O u tp u t C u rre n t (m A )
HT7730 Start-Up& Hold-On Voltage
wwHw.TDa7t7aXShXeet4U.com
3 .4
3 .3 V IN = 2 .0 V
V IN = 1 .8 V
3 .2
V IN = 1 .2 V V IN = 1 .5 V
3 .1
3 .0
2 .9
2 .8
2 .7
2 .6
2 .5
0 20 40 60 80 100 120 140
O u tp u t C u rre n t (m A )
HT7733 Output Voltage v.s Output Current
90
85
V IN = 2 .0 V
80
V IN = 1 .8 V
75
70
V IN = 1 .2 V
V IN = 1 .5 V
65
60
55
50
0 20 40 60
80 100 120 140
O u tp u t C u rre n t (m A )
HT7733 Efficiency v.s Output Current
1 .0
0 .9 S ta rt u p
0 .8
0 .7
0 .6
0 .5
0 .4
H o ld o n
0 .3
0 .2
0 .1
0 .0
024
6 8 10 12 14 16 18 20
O u tp u t C u rre n t (m A )
HT7733 Start-Up& Hold-On Voltage
Rev 1.60
5 September 12, 2007
5 Page 
3-pin SOT-89 Outline Dimensions
A
B
wwHw.TDa7t7aXShXeet4U.com
I
J
E
G
F
H
Symbol
A
B
C
D
E
F
G
H
I
J
Min.
173
64
90
35
155
14
17
¾
55
14
C
D
Dimensions in mil
Nom.
¾
¾
¾
¾
¾
¾
¾
59
¾
¾
Max.
181
72
102
47
167
19
22
¾
63
17
Rev 1.60
11 September 12, 2007
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet HT7718.PDF ] | |
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