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| 型号： | LTC1262IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV FLASHMEM 12V 8SOIC |
| 标准包装： | 100 |
| 应用： | 转换器，编程电源 |
| 输入电压： | 4.75 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 12V |
| 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） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
LTC1262
APPLICATIO N S I N FOR M ATIO N
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).
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 TANTALUM ALUMINUM
C1, C2 0.22 μ F to 1 μ F Not Not
Recommended Recommended
C OUT 2 μ F (Min) 4.7 μ F (Min) 10 μ F (Min)
C IN 1 μ F (Min) 4.7 μ F (Min) 10 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.
5
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| LTC1263CS8 | 功能描述:IC DC/DC CONV FLASHMEM 12V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1263CS8#PBF | 功能描述:IC DC/DC CONV FLASHMEM 12V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC1263CS8#TR | 功能描述:IC CONV DC/DC FLASH MEMORY 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1263CS8#TRPBF | 功能描述:IC DC/DC CONV FLASHMEM 12V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1263CS8PBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up 4.75-5.5V SOIC8 |
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