Rainbow-electronics MAX1765 Manual do Utilizador Página 17
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where I
LIM
is the peak inductor current limit, f
SW
is the
operating frequency (typically 1.2MHz), L is the induc-
tance of the chosen inductor, L
RESR
is the resistance of
the chosen inductor, R
NCH
and R
PCH
are the resis-
tances of the internal N-channel and P-channel,
respectively.
Table 5 lists the typical available output current when oper-
ating with one or more NiCd/NiMH cells or one Li+ cell.
Adding a Manual Power Reset
A momentary pushbutton switch can be used to turn
the MAX1765 on and off (Figure 11). ONA is pulled low
and ONB is pulled high to turn the device off. When the
momentary switch is pressed, ONB is pulled low and
II
I
ID
I
f
D
L
VI R L
D
VVI RL
VIRR
OUT MAX LIM
RIPPLE
RIPPLE
SW
IN LIM NCH ESR
OUT IN LIM NCH ESR
OUT LIM PCH NCH
,
=−
−
()
=××−× +
()
[]
=
−+ × +
()
+−
()
2
1
MAX1765
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
______________________________________________________________________________________ 17
Figure 9. Soft-Start, Maximum Current Limit
C
SS
R
SS
I
LIM
= 1.25A
t
SS
= R
SS
C
SS
500k
Ω
< R
SS
< 1M
Ω
MAX1765
REF
ISET
0.22
µ
F
Figure 8. Soft-Start, Reduced Current Limit
C
SS
MAX1765
REF
ISET
0.22
µ
F
R
SS1
R
SS2
I
LIM
= 1.25A
t
SS
= (R
SS1
|| R
SS2
) C
SS
( )
R
SS2
R
SS1
+
R
SS2
Table 3. Component Selection Guide
PRODUCTION 3.3µH INDUCTORS CAPACITORS SCHOTTKY DIODES
Surface Mount
Coilcraft DS3316P
Coilcraft LPT3305
AVX TPS series
Kemet T510 series
Sanyo POSCAP series
Motorola MBR0520L
Nihon EP10QY03
Table 4. Component Suppliers
SUPPLIER COUNTRY PHONE
AVX
USA
843-448-9411
Coilcraft
USA
847-639-6400
Kemet
USA
810-287-2536
USA 408-629-4789
Motorola
Japan 81-45-474-7030
USA 847-956-0666
Sumida
Japan 81-3-3607-3302
Note: Please indicate that you are using the MAX1765 when
contacting these component suppliers.
- TEMP. RANGE 1
- PIN-PACKAGE 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- LINE TRANSIENT RESPONSE 8
- Pin Description 9
- Detailed Description 10
- Step-Up Converter 10
- Pin Description (continued) 10
- Forced PWM Operation 12
- Synchronized PWM Operation 12
- Synchronous Rectifier 12
- Linear Regulator 12
- Configurations 13
- Shutdown 13
- Design Procedure 14
- Package Selection 15
- Inductor Selection 15
- Applications Information 16
- ( ) 17
- Chip Information 18
- QSOP.EPS 19
- TSSOP, 4.0,EXP PADS.EPS 19
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