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PDF HT7733A Data sheet ( Hoja de datos )
| Número de pieza | HT7733A | |
| 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 HT7733A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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
1 page  
HT77XXA
3 .0 3
2 .9 5 V IN = 2 .0 V
2 .8 8
V IN = 1 .2 V
V IN = 1 .5 V
V IN = 1 .8 V
2 .8 0
2 .7 3
2 .6 5
2 .5 8
2 .5 0
0 20 40 60 80 100 120 140 160 180 200 220
O u tp u t C u rre n t (m A )
HT7730A Output Voltage v.s Output Current
(CIN=47mF-Tantalum, L=47mH, COUT=22mF-Tantalum)
90%
85%
80%
75%
70%
65%
60%
55%
0
V IN = 1 .5 V
V IN = 1 .2 V
V IN = 2 .0 V
V IN = 1 .8 V
20 40
60 80 100 120 140 160 180 200 220
O u tp u t C u rre n t (m A )
HT7730A Efficiency v.s Output Current
(CIN=47mF-Tantalum, L=47mH, COUT=22mF-Tantalum)
360
V IN = 1 .8 V
310
V IN = 1 .5 V
260
V IN = 2 .0 V
210
V IN = 1 .2 V
160
110
60
10
0 20 40 60 80 100 120 140 160 180 200 220
O u tp u t C u rre n t (m A )
HT7730A Ripple Voltage v.s Output Current
(CIN=47mF-Tantalum, L=47mH, COUT=22mF-Tantalum)
360
310
260
V IN = 1 .5 V
210
160
V IN = 1 .8 V
1 1 0 V IN = 1 .2 V
6 0 V IN = 2 .0 V
10
0 10 20 30 40 50 60 70 80 90 100 110
O u tp u t C u rre n t (m A )
HT7730A Ripple Voltage v.s Output Current
(CIN=47mF-Tantalum, L=100mH, COUT=22mF-Tantalum)
1 S ta rt-u p
0 .9 H o ld - o n
0 .8
0 .7
0 .6
0 .5
0 .4
0 .3
0 .2
0 .1
0 2 4 6 8 10 12 14 16 18 20 22
O u tp u t C u rre n t (m A )
HT7730A Start-up/Hold-on Voltage
(CIN=47mF-Tantalum, L=47mH, COUT=22mF-Tantalum)
Rev 1.10
5 September 26, 2007
5 Page 
3-pin SOT-23 Outline Dimensions
D
E
e
C
L
H
A2
Symbol
A
A1
A2
b
C
D
E
e
H
L
q
b
Min.
1
¾
0.7
0.35
0.1
2.7
1.4
¾
2.6
0.37
1°
A
A1
Dimensions in mm
Nom.
¾
¾
¾
¾
¾
¾
¾
1.9
¾
¾
¾
HT77XXA
Max.
1.3
0.1
0.9
0.5
0.25
3.1
1.8
¾
3
¾
9°
Rev 1.10
11 September 26, 2007
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HT7733A.PDF ] | |
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