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參數(shù)資料
| 型號： | LTC1262 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Regulated 12V, 30mA output DC/DC converter.(12V穩(wěn)壓, 30mA輸出DC/DC變換器) |
| 中文描述： | 調(diào)節(jié)12V，30mA電流輸出DC / DC轉(zhuǎn)換器。（12V的穩(wěn)壓，30mA的輸出直流/直流變換器） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 198K |
| 代理商： | LTC1262 |
5
LTC1262
APPLICATIO
S I
FOR
ATIO
U
Operation
The LTC1262 uses a charge pump tripler to generate 12V
from a V
CC
of 5V. The charge pump operates when clocked
by a 300kHz oscillator. When the oscillator output is low,
C1 and C2 are connected between V
CC
and GND, charging
them to V
CC
. When the oscillator output goes high, C1 and
C2 are stacked in series with the bottom plate of C1 pulled
to V
CC
. The top plate of C2 is switched to charge C
OUT
and
V
OUT
rises. V
OUT
is regulated to within 5% of 12V by an
oscillator pulse gating scheme. A resistor divider senses
V
OUT
. When the output of the divider (V
DIV
) is less than the
output of a bandgap (V
BGAP
) by the hysteresis voltage
(V
HYST
) of the comparator, oscillator pulses are applied to
the charge pump to raise V
OUT
. When V
DIV
is above V
BGAP
by V
HYST
, the oscillator pulses are prevented from clock-
ing the charge pump. V
OUT
drops until V
DIV
is below V
BGAP
by V
HYST
again. The gates of all internal switches are
driven between V
OUT
and GND. An internal diode ensures
that the LTC1262 will start up under load by charging C
OUT
to one diode drop below V
CC
.
To reduce supply current the LTC1262 may be put into
shutdown mode by floating the SHDN pin or taking it to
V
CC
. In this mode the bandgap, comparator, oscillator and
resistor divider are switched off to reduce supply current
to typically 0.5
μ
A. At the same time an internal switch
shorts V
OUT
to V
CC
; V
OUT
takes 3.3ms to reach 5.1V (see
t
OFF
in Figure 1). When the SHDN pin is low, the LTC1262
exits shutdown and the charge pump operates to raise
V
OUT
to 12V. V
OUT
takes 500
μ
s to reach the lower regula-
tion limit of 11.4V (see t
ON
in Figure 1).
W
U
U
Choice of Capacitors
The LTC1262 is tested with the capacitors shown in
Figure 2. C1 and C2 are 0.22
μ
F ceramic capacitors and
C
IN
and C
OUT
are 4.7
μ
F tantalum capacitors. Refer to
Table 1 if other choices are desired.
Table 1. Recommended Capacitor Types and Values
CAPACITOR
CERAMIC
C1, C2
0.22
μ
F to 1
μ
F
TANTALUM
Not
Recommended
4.7
μ
F (Min)
4.7
μ
F (Min)
ALUMINUM
Not
Recommended
10
μ
F (Min)
10
μ
F (Min)
C
OUT
C
IN
2
μ
F (Min)
1
μ
F (Min)
C1 and C2 should be ceramic capacitors with values in the
range of 0.22
μ
F to 1
μ
F. Higher values provide better load
regulation. Tantalum capacitors are not recommended as
the higher ESR of these capacitors degrades performance
when the load current is above 25mA with V
CC
= 4.75V.
C
IN
and C
OUT
can be ceramic, tantalum or electrolytic
capacitors. The ESR of C
OUT
introduces steps in the V
OUT
waveform whenever the charge pump charges C
OUT
. This
tends to increase V
OUT
ripple. Ceramic or tantalum capaci-
tors are recommended for C
OUT
if minimum ripple is
desired. The LTC1262 does not require a 0.1
μ
F capacitor
between V
CC
and V
OUT
for stability.
Maximum Load Current
The LTC1262 will source up to 50mA continuously without
any damage to itself.
Do not short the V
OUT
pin to ground
.
If the V
OUT
pin is shorted to ground, irreversible damage
to the device will result.
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