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參數(shù)資料
| 型號(hào)： | LTC3226EUD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 431K |
| 代理商： | LTC3226EUD#TRPBF |
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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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