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LTC3246 데이터시트(HTML) 3 Page - Analog Devices

부품명 LTC3246
상세내용  Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer
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LTC3246 데이터시트(HTML) 3 Page - Analog Devices

 
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LTC3246
3
3246fa
For more information www.linear.com/LTC3246
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IADJ
VOUTS/ADJ Input Current
SEL1 = SEL2 = VIN
l
–50
0
+50
nA
IOUT_SCKT
IVOUT Short Circuit Foldback Current VOUT = 0V
250
mA
ROUT
Charge Pump Output Impedance
2:1 Step-Down Mode
1:1 Step-Down Mode, VIN = 5.5V
1:2 Step-Up Mode, VIN = 3V, VOUT ≥ 3.3V (Note 6) l
1
1.2
4
8
VOUT_OV_RST
VOUT Overvoltage Reset
% of Final Regulation Voltage at Which
VOUT Rising Makes RST Go Low
VOUT Falling Makes RST Go Hi-Z
l
l
106
109
108.5
111.5
%
%
VOUT_UV_RST
VOUT Undervoltage Reset
% of Final Regulation Voltage at Which
VOUT Rising Makes RST Go Hi-Z
VOUT Falling Makes RST Go Low
l
l
93
97.5
95
99
%
%
VOUT_PD
VOUT Pull-Down in Shut Down
SEL1 = SEL2 = 0V
100
k
VOUT_RIPPLE
VOUT Ripple Voltage
COUT = 10µF
COUT = 22µF
50
25
mV
mV
Reset Timer Control Pin (RT)
IRT(UP)
RT Pull-Up Current
VRT = 0.3V
l
–2
–3.1
–4.2
µA
IRT(DOWN)
RT Pull-Down Current
VRT = 1.3V
l
2
3.1
4.2
µA
IRT(INT)
Internal RT Detect Current
VRT = VBIAS
l
0.4
1
µA
VRT(INT)
RT Internal Timer Threshold
VRT Rising
l
2.0
2.4
2.65
V
Reset Timer Input (RSTI)
VRSTI_H
RSTI Input High Voltage
l
1.22
1.27
V
VRSTI_L
RSTI Input Low Voltage
l
1.04
1.2
V
IRSTI_H
RSTI Input High Current
RSTI = 5V
l
–1
0
1
µA
IRSTI_L
RSTI Input Low Current
RSTI = 0V
l
–1
0
1
µA
Reset Timing
tRST(INT)
Internal Reset Timeout Period
VRT = VBIAS
150
200
270
ms
tRST(EXT)
Adjustable Reset Timeout Period
CRT = 2.2nF
l
14
21
28
ms
tRSTIL
RSTI Low to RST Asserted
l
5
20
40
µs
Reset Output (RST)
VOL(RST)
Output Voltage Low RST
IRST = 2mA
l
0.1
0.4
V
IOH(RST)
RST Output Voltage High Leakage
VRST = 5V
l
–1
0
1
µA
Watchdog Timing
tWDU(INT)
Internal Watchdog Upper Boundary
VWT = VBIAS
l
1.2
1.6
2.2
s
tWDL(INT)
Internal Watchdog Lower Boundary
VWT = VBIAS
l
37.5
50
68
ms
tWDR(EXT)
External Watchdog Timeout Period
CWT = 2.2nF
l
100
160
220
ms
tWDU(EXT)
External Watchdog Upper Boundary
l
tWDR(EXT) • (128/129)
ms
tWDL(EXT)
External Watchdog Lower Boundary
l
tWDR(EXT) • (5/129)
ms
Watchdog Timer Input (WDI)
VIH
WDI Input High Voltage
l
1.1
1.6
V
VOL
WDI Input Low Voltage
l
0.4
0.8
V
IIH
WDI Input High Current
VWDI = 38V
l
–1
0
1
µA
IIL
WDI Input Low Current
VWDI = 0V
l
–1
0
1
µA
tPW(WDI)
Input Pulsewidth
l
400
ns
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, CFLY = 2.2µF, COUT = 10µF, unless otherwise noted.


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