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參數資料
型號: MC34270FB
廠商: MOTOROLA INC
元件分類: 穩壓器
英文描述: Single Output LDO, 250mA, Fixed(3.0V), Low Noise, Fast Transient Response 5-SOT-23 -40 to 85
中文描述: 0.5 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQFP32
封裝: PLASTIC, QFP-32
文件頁數: 4/12頁
文件大小: 364K
代理商: MC34270FB
MC34270 MC34271
4
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS
(continued)
(VDD = 6.0 V, for typical values TA = Low to High [Note 1], for min/max values TA is
the operating ambient temperature range that applies, unless otherwise noted.)
Characteristic
Unit
Max
Typ
Min
Symbol
AUXILIARY VOLTAGE OUTPUTS
V1, V2, V3, V4 Outputs
1–V1/V0 Ratio:
MC34270
MC34271
MC34270
MC34271
MC34270
MC34271
MC34270
MC34271
0.0565
0.0500
0.1135
0.1010
0.1135
0.1010
0.0565
0.0500
20
5.0
0.0580
0.0520
0.1160
0.1035
0.1160
0.1035
0.0580
0.0520
40
10
0.0595
0.0535
0.1185
0.1065
0.1185
0.1065
0.0595
0.0535
60
20
1–V2/V0 Ratio:
V3/V0 Ratio:
V4/V0 Ratio:
Output Resistance (Isource = 4.0 mA)
Output Short Circuit Current
Ro
Iss
mA
LOGIC INPUTS (EN1, EN2, MODE)
Input Low State
VIL
VIH
Rin
0
0.8
V
Input High State
2.0
6.0
V
Input Impedance
25
50
100
k
SOFT START CONTROL (SS1,SS2)
Charge Current (Capacitor Voltage = 1.0 V to 4.0 V
)
Ichg
0.5
1.0
2.5
μ
A
Discharge Current (Capacitor Voltage = 1.0 V)
Idschg
250
650
μ
A
TOTAL SUPPLY CURRENT
VDD Current
Standby Mode (EN1 = EN2 = 0)
VDD Current
Backlight “On” (EN1 = 1; EN2 = 0)
VDD Current
LCD “On” (No Inductor) (EN1 = 0; EN2 = 1)
VB Current (V0 = 35 V)
VDD = 6.0 V
VDD = 16 V
ICC
2.0
3.0
5.0
15
μ
A
ICC
0.7
3.0
mA
ICC
0.9
2.0
mA
IO
1.2
3.0
mA
NOTE:
1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
10
100
1.5
1.0
AV
f, FREQUENCY (Hz)
D
Figure 1. Switch Output Duty Cycle versus
Compensation Voltage
VComp, COMPENSATION VOLTAGE (V)
Figure 2. Error Amp Open Loop Gain and
Phase versus Frequency
0.6
0.4
0.2
0
0.8
80
60
40
20
0
– 20
2.0
2.5
3.0
3.5
4.0
4.5
100
1.0 k
10 k
100 k
1000 k
θ
,
90
120
150
180
°
VDD = 6.0 V
TA = 25
°
C
VDD = 6.0 V
VComp = 2.5 V
RL = Open
TA = 25
°
C
0
30
60
Gain
Phase
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