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參數(shù)資料
| 型號： | LTC1522 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower, Regulated 5V Charge Pump DC/DC Converter |
| 中文描述： | 微功耗，電壓5V充電泵DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 223K |
| 代理商： | LTC1522 |
6
LTC1522
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 2. Ultralow Quiescent Current (<2.1
μ
A) Regulated Supply
1
2
3
4
8
7
6
5
NC
SHDN
GND
C
–
NC
V
IN
V
OUT
C
+
LTC1522
FROM MPU
10
μ
F
10
μ
F
V
OUT
5V
4%
SHDN PIN WAVEFORMS:
LOW I
Q
MODE (2Hz TO 100Hz, 95% TO 98% DUTY CYCLE)
I
OUT
≤
100
μ
A
V
OUT
LOAD ENABLE MODE
(I
OUT
= 100
μ
A TO 20mA)
0.22
μ
F
V
2.7V TO 5V
+
+
1522 F02
INPUT VOLTAGE (V)
0.0
2.0
4.0
6.0
S
μ
A
5.0
1522 F03a
2.0
3.0
4.0
Figure 3a. No-Load I
CC
vs Input Voltage for Circuit in Figure 3
OUTPUT CURRENT (
μ
A)
1
10
100
1000
M
1000
1522 F03b
1
10
100
SHDN ON PULSE WIDTH = 200
μ
s
C
OUT
= 10
μ
F
The LTC1522 must be out of shutdown for a minimum
duration of 200
μ
s to allow enough time to sense the output
and keep it in regulation. A 2Hz, 98% duty cycle signal will
keep V
OUT
in regulation under no-load conditions. As the
V
OUT
load current increases, the frequency with which the
part is taken out of shutdown must also be increased to
prevent V
OUT
from drooping below 4.8V during the OFF
phase (see Figure 3b). A 100Hz 98% duty cycle signal on
the SHDN pin ensures proper regulation with load currents
as high as 100
μ
A. When load current greater than 100
μ
A
is needed, the SHDN pin must be forced low as in normal
operation. The typical no-load supply current for this
circuit with V
IN
= 3V is only
2.1
μ
A
.
Each time the LTC1522 comes out of shutdown, the part
delivers a minimum of one clock cycle worth of charge to
the output. Under high V
IN
(>3.3V) and/or low I
OUT
(<10
μ
A)
conditions, this behavior may cause a net excess of charge
to be delivered to the output capacitor if a high frequency
signal is used on the SHDN pin (e.g., 50Hz to 100Hz).
Under such conditions, V
OUT
will slowly drift positive and
may even go out of regulation. To avoid this potential
problem in the low I
Q
mode, it is necessary to switch the
part in and out of shutdown at the minimum allowable
frequency (refer to Figure 3b) for a given output load.
Figure 3b. Maximum SHDN OFF Time vs Output Load Current
for Ultralow I
Q
Operation
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| LTC1522CMS8#TR | 功能描述:IC REG SWITCHED CAP 5V 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1522CMS8#TRPBF | 功能描述:IC REG SWITCHED CAP 5V 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1522CS8 | 功能描述:IC REG SWITCHED CAP 5V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
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