参数资料
型号: LTC1909-8EG#TRPBF
厂商: Linear Technology
文件页数: 2/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-SSOP
标准包装: 2,000
PWM 型: 电流模式
输出数: 1
频率 - 最大: 200kHz
占空比: 90%
电源电压: 4 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
LTC1909-8
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
Input Supply Voltage
V IN , I ON .................................................. – 0.3V to 36V
Boosted Topside Driver Supply Voltage
BOOST .................................................. – 0.3V to 42V
SW, SENSE + Voltages ................................. – 5V to 36V
RUN/SS
V ON
PGOOD
V RNG
1
2
3
4
TOP VIEW
28 BOOST
27 TG
26 SW
25 SENSE +
ORDER PART
NUMBER
LTC1909-8EG
I TH
I ON
V FB
EXTV CC , (BOOST – SW), RUN/SS, PGOOD, INTV CC ,
SEL, SDA, SCL, VRON, PGTMR, V OSENSE ,
FB, CPUON, V CC Voltages .......................... – 0.3V to 7V
FCB, V ON , V RNG Voltages ....... – 0.3V to (INTV CC + 0.3V)
I TH , V FB Voltages...................................... – 0.3V to 2.7V
TG, BG, INTV CC , EXTV CC Peak Currents .................... 2A
TG, BG, INTV CC , EXTV CC RMS Currents .............. 50mA
FCB 5
6
SGND 7
8
9
SEL 10
SDA 11
SCL 12
24 PGND
23 BG
22 INTV CC
21 V IN
20 EXTV CC
19 V CC
18 GND
17 FB
Operating Ambient Temperature Range
LTC1909-8EG (Note 2) ....................... – 40 ° C to 85 ° C
Junction Temperature (Note 4) ............................ 125 ° C
Storage Temperature Range ................. – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec).................. 300 ° C
VRON 13 16 V OSENSE
PGTMR 14 15 CPUON
G PACKAGE
28-LEAD PLASTIC SSOP
T JMAX = 125 ° C, θ JA = 95 ° C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS (Switching Regulator Controller) The q denotes specifications which apply
over the full operating temperature range, otherwise specifications are T A = 25 ° C. V IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
I Q
Input DC Supply Current
Normal
Shutdown Supply Current
900
15
2000
30
μ A
μ A
V FB
Feedback Reference Voltage
I TH = 1.2V (Note 3)
q
0.792
0.800
0.808
V
? V FB(LINEREG)
Feedback Voltage Line Regulation
V IN = 4V to 30V, I TH = 1.2V (Note 3)
0.002
%/V
? V FB(LOADREG)
I FB
Feedback Voltage Load Regulation
Feedback Input Current
I TH = 0.5V to 1.9V (Note 3)
V FB = 0.8V
q
– 0.05
–5
– 0.3
± 50
%
nA
g m(EA)
V FCB
I FCB
t ON
t ON(MIN)
t OFF(MIN)
V SENSE(MAX)
Error Amplifier Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
V PGND – V SENSE+
I TH = 1.2V (Note 3)
V FCB = 0.8V
I ON = 60 μ A, V ON = 1.5V
I ON = 30 μ A, V ON = 1.5V
I ON = 180 μ A, V ON = 0V
I ON = 60 μ A, V ON = 1.5V
V RNG = 1V, V FB = 0.76V
V RNG = 0V, V FB = 0.76V
q
q
q
1.4
0.76
212
425
113
79
1.7
0.8
–1
250
500
50
250
133
93
2
0.84
–2
288
575
100
400
153
107
mS
V
μ A
ns
ns
ns
ns
mV
mV
V RNG = INTV CC , V FB = 0.76V
158
186
214
mV
V SENSE(MIN)
Minimum Current Sense Threshold
V PGND – V SENSE+
V RNG = 1V, V FB = 0.84V
V RNG = 0V, V FB = 0.84V
V RNG = INTV CC , V FB = 0.84V
– 67
– 47
– 93
mV
mV
mV
? V FB(OV)
Output Overvoltage Fault Threshold
5.5
7.5
9.5
%
19098f
2
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