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| 型号： | LTC1261CS8-4.5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | -4.5V |
| 输入电压： | 3 V ~ 8 V |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 15mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LTC1261
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V CC = 3V to 6.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
0°C ≤ T A ≤ 70°C
MIN TYP MAX
–40°C ≤ T A ≤ 85°C
(Note 7)
MIN TYP MAX
UNITS
V REF
I S
Reference Voltage
Supply Current
No Load, SHDN Floating, Doubler Mode
No Load, SHDN Floating, Tripler Mode
No Load, V SHDN = V CC
l
l
l
l
1.20
1.24
600
900
5
1.28
1000
1500
20
1.20
1.24
600
900
5
1.28
1500
2000
20
V
μA
μA
μA
f OSC
P EFF
Internal Oscillator Frequency
Power Efficiency
550
65
550
65
kHz
%
V OL
REG Output Low Voltage
I REG = 1mA
l
0.1
0.8
0.1
0.8
V
I REG
REG Sink Current
V REG = 0.8V, V CC = 3.3V
V REG = 0.8V, V CC = 5.0V
l
l
5
8
8
15
5
8
8
15
mA
mA
I ADJ
Adjust Pin Current
V ADJ = 1.24V
l
0.01
1
0.01
1
μA
V IH
V IL
SHDN Input High Voltage
SHDN Input Low Voltage
l
l
2
0.8
2
0.8
V
V
I IN
SHDN Input Current
V SHDN = V CC
l
5
20
5
25
μA
t ON
Turn-On Time
I OUT = 15mA
500
500
μs
Doubler Mode. V CC = 5V ±10%, C1 = 0.1μF, C2 = 0 (Note 4), C OUT = 3.3μF unless otherwise s pecified .
?V OUT
I SC
Output Regulation (Note 2)
Output Short-Circuit Current
–1.24V ≥ V OUT ≥ –4V, 0 ≤ I OUT ≤ 8mA
–1.24V ≥ V OUT ≥ –4V, 0 ≤ I OUT ≤ 7mA
–4V ≥ V OUT ≥ –5V, 0 ≤ I OUT ≤ 8mA (Note 6)
V OUT = 0V
l
l
l
1
2
60
5
125
1
2
60
5
125
%
%
%
mA
V RIP
Output Ripple Voltage
I OUT = 5mA, V OUT = –4V
5
5
mV
LTC1261CS Only. Tripler Mode. V CC = 2.7V, C1 = C2 = 0.1μF (Note 4), C OUT = 3.3μF unles s otherwise specified.
?V OUT
I SC
Output Regulation
Output Short-Circuit Current
–1.24V ≥ V OUT ≥ –4V, 0 ≤ I OUT ≤ 5mA
V OUT = 0V
l
l
1
60
5
125
1
60
5
125
%
mA
V RIP
Output Ripple Voltage
I OUT = 5mA, V OUT = –4V
5
5
mV
LTC1261CS Only. Tripler Mode. V CC = 3.3V ± 10%, C1 = C2 = 0.1μF (Note 4), C OUT = 3.3μ F unless otherwise specified.
?V OUT
I SC
Output Regulation (Note 2)
Output Short-Circuit Current
–1.24V ≥ V OUT ≥ –4.5V, 0 ≤ I OUT ≤ 6mA
–4.5V ≥ V OUT ≥ –5V, 0 ≤ I OUT ≤ 3.5mA
V OUT = 0V
l
l
l
1
2
35
5
5
75
1
2
35
5
75
%
%
mA
V RIP
Output Ripple Voltage
I OUT = 5mA, V OUT = –4V
5
5
mV
LTC1261CS Only. Tripler Mode. V CC = 5V ±10%, C1 = C2 = 0.1μF (Note 4), C OUT = 3.3μF unless otherwise specified.
?V OUT
I SC
Output Regulation
Output Short-Circuit Current
–1.24V ≥ V OUT ≥ –4V, 0 ≤ I OUT ≤ 12mA
–4V ≥ V OUT ≥ –5V, 0 ≤ I OUT ≤ 10mA
V OUT = 0V
l
l
l
1
2
35
5
5
75
1
2
35
5
5
75
%
%
mA
V RIP
Output Ripple Voltage
I OUT = 5mA, V OUT = –4V
5
5
mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: All typicals are given at T A = 25°C.
Note 4: C1 = C2 = 0.1μF means the specifications apply to tripler mode
where V CC – V OUT = 3V CC (LTC1261CS only; the LTC1261CS8 cannot be
connected in tripler mode) with C1 connected between C1 + and C1 – and
C2 connected between C2 + and C2 – . C2 = 0 implies doubler mode where
V CC – V OUT = 2V CC ; for the LTC1261CS this means C1 connects from C1 +
to C2 – with C1 – and C2 + floating. For the LTC1261CS8 in doubler mode,
C1 connects from C1 + to C1 – ; there are no C2 pins.
Note 5: Setting output to <–7V will exceed the absolute voltage maximum
rating with a 5V supply. With supplies higher than 5V, the output should
never be set to exceed V CC – 12V.
Note 6: For output voltages below –4.5V the LTC1261 may reach 50%
duty cycle and fall out of regulation with heavy load or low input voltages.
Beyond this point, the output will follow the input with no regulation.
Note 7: The LTC1261C is guaranteed to meet specifications from 0°C
to 70°C and is designed, characterized and expected to meet industrial
temperature limits, but is not tested at –40°C and 85°C. The LTC1261IS8
is guaranteed to meet specifications from –40°C and 85°C.
1261fb
For more information www.linear.com/LTC1261
3
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| LTC1261IS8 | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC1261IS8#PBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC1261IS8#TR | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC1261IS8#TRPBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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