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参数资料
| 型号： | LTC3226EUD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, PQCC16 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件页数： | 4/16页 |
| 文件大小： | 431K |
| 代理商： | LTC3226EUD#PBF |
LTC3226
12
3226f
APPLICATIONS INFORMATION
where VF is the forward voltage of the diode. As an ex-
ample, if RPF1 = 200k, RPF2 = 120k, RH = 2M, and VF =
0.4V, the additional hysteresis provided by this network
can be calculated using the above equation as follows:
VIN(HYS) = 1.2+0.02–0.4
(
)V 200k
2M
= 82mV
Programming the Reset Threshold
Thethresholdfortheresetcomparatorcanbeprogrammed
by using a resistor divider from the VOUT pin to GND via
the RST_FB pin such that:
VOUT = VRST_FB 1+
RFB1
RFB2
where VRST_FB is 0.74V. See Figure 1. Typical values for
RFB1 and RFB3 are in the range of 40k to 5M. In most ap-
plications, the LDO_FB and RST_FB pins can be shorted
together and only one resistor divider between VOUT and
GND is needed to set VOUT and the reset threshold 7.5%
below the VOUT programmed voltage. However, the reset
threshold can be set independent of VOUT by an additional
resistor divider.
Effective Open-Loop Output Resistance (ROL) of the
Charge Pump
Theeffectiveopen-loopoutputresistance(ROL)ofacharge
pumpdeterminesthestrengthofachargepump.Thevalue
of this parameter depends on many factors such as the
oscillator frequency (fOSC), value of the flying capacitor
(CFLY),thenonoverlaptime,theinternalswitchresistances
(RS), and the ESR of the external capacitors. A first order
approximation of ROL is given below:
ROL 2 Σ
S
=1to4
RS +
1
fOSC CFLY
3226 F02
LTC3226
D1
VIN
VOUT
PFO
PFI
470k
RPF1
RH
RPF2
Figure 2. Increasing PFI Comparator Hysteresis Externally
Programming the LDO Output Voltage (VOUT)
The LDO output voltage in backup mode can be pro-
grammed for any voltage between 2.5V to 5.3V by using a
resistor divider from the VOUT pin to GND via the LDO_FB
pin such that:
VOUT = VLDO_FB 1+
RFB1
RFB2
where VLDO_FB is 0.8V. See the Block Diagram in Figure 1.
Typical values for RFB1 and RFB2 are in the range of 40k to
500k. Too small a resistor will result in a large quiescent
current whereas too large a resistor coupled with LDO_FB
pin capacitance will create an additional pole and may
cause loop instability.
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相关代理商/技术参数 |
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| LTC3230EUD#PBF | 功能描述:IC LED DRIVR WHITE BCKLGT 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
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