參數(shù)資料
型號(hào): LTC1751-3.3
廠商: Linear Technology Corporation
英文描述: Micropower, Regulated Charge Pump DC/DC Converters
中文描述: 微功耗,穩(wěn)壓電荷泵DC / DC轉(zhuǎn)換器
文件頁(yè)數(shù): 5/12頁(yè)
文件大小: 211K
代理商: LTC1751-3.3
5
LTC1751/LTC1751-3.3/LTC1751-5
PIU
PGOOD (Pin 1) (LTC1751-3.3/LTC1751-5):
Output Volt-
age Status Indicator. On start-up, this open-drain pin re-
mains low until the output voltage, V
OUT
, is within 4.5%
(typ) of its final value. Once V
OUT
is valid, PGOOD becomes
high-Z. If, due to a fault condition, V
OUT
falls 7% (typ) below
its correct regulation level, PGOOD pulls low. PGOOD may
be pulled up through an external resistor to any appropri-
ate reference level.
FB (Pin 1) (LTC1751):
The voltage on this pin is compared
to the internal reference voltage (1.205V) by the error
comparator to keep the output in regulation. An external
resistor divider is required between V
OUT
and FB to pro-
gram the output voltage.
V
OUT
(Pin 2):
Regulated Output Voltage. For best perfor-
mance, V
OUT
should be bypassed with a 6.8
μ
F (min) low
ESR capacitor as close to the pin as possible .
V
IN
(Pin 3):
Input Supply Voltage. V
IN
should be bypassed
with a 6.8
μ
F (min) low ESR capacitor.
GND (Pin 4):
Ground. Should be tied to a ground plane for
best performance.
C
(Pin 5):
Flying Capacitor Negative Terminal.
C
+
(PIN 6):
Flying Capacitor Positive Terminal.
SHDN (Pin 7):
Active Low Shutdown Input. A low on
SHDN disables the device. SHDN must not be allowed to
float.
SS (Pin 8):
Soft-Start Programming Pin. A capacitor on SS
programs the start-up time of the charge pump so that
large start-up input current is eliminated.
TYPICAL PERFOR U
(LTC1751-5)
Power Efficiency vs Load Current
Short-Circuit Output Current
vs Input Voltage
Start-Up
C
SS
= 10nF
2ms/DIV
1751 G13
SHDN
2V/DIV
PGOOD
5V/DIV
V
2V/DIV
Output Ripple
V
IN
= 3V
I
OUT
= 100mA
C
OUT
= 10
μ
F
5
μ
s/DIV
1751 G14
V
AC COUPLED
50mV/DIV
Load Transient Response
V
IN
= 3V
50
μ
s/DIV
1751 G15
V
AC COUPLED
50mV/DIV
I
50mA/DIV
LOAD CURRENT (mA)
0.001
40
E
50
60
70
80
0.01
0.1
1
10
100
1751 G11
30
20
10
0
90
100
V
IN
= 2.7V
V
IN
= 4.1V
V
IN
= 5.5V
T
A
= 25
°
C
C
FLY
= 1
μ
F
C
OUT
= 10
μ
F
INPUT VOLTAGE (V)
2.0
50
O
100
150
200
250
2.5
3.0
3.5
4.0
1751 G12
4.5
5.0
5.5
T
A
= 25
°
C
C
FLY
= 1
μ
F
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