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LT3688 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3688
Description  Dual 800mA Step-Down Switching Regulator with Power-On Reset
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3688 Datasheet(HTML) 3 Page - Linear Technology

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LT3688
3
3688f
The
l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted. (Note 3)
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Undervoltage Lockout
l
3
3.5
3.8
V
Quiescent Current from VIN
VEN/UVLO = 0.3V
VBIAS = 5V, Not Switching
VBIAS = 0V, Not Switching
l
0.01
65
235
1
105
310
μA
μA
μA
Quiescent Current from BIAS
VEN/UVLO = 0.3V
VBIAS = 5V, Not Switching
VBIAS = 0V, Not Switching
l
0.01
155
–5
1
200
–20
μA
μA
μA
FB Voltage
l
0.790
0.784
0.800
0.810
0.814
V
V
FB Pin Bias Current
VFB = 0.800V
l
–3
–50
nA
FB Voltage Line Regulation
5V < VIN < 36V
0.002
%/V
Switching Frequency
RT = 20k, VBST = 12V
RT = 110k, VBST = 12V
l
l
1.85
460
2.1
500
2.35
540
MHz
kHz
Minimum Off-Time (Note 4)
VBST = 12V
l
115
180
ns
Switch Current Limit (Note 5)
DC = 15%
l
1.2
1.7
2.2
A
Switch VCESAT
ISW = 0.8A
280
mV
Switch Leakage Current (Note 8)
–0.01
–1
μA
DA Current Limit
l
0.9
1.2
1.6
A
Boost Schottky Reverse Leakage
VBIAS = 0V
0.01
2
μA
Minimum BST Voltage above SW
2.15
2.5
V
BST Pin Current
ISW = 0.8A
15
25
mA
EN/UVLO Threshold Voltage
l
1.15
1.25
1.35
V
EN/UVLO Input Current
VEN/UVLO = 1.35V
VEN/UVLO = 1.15V
2.5
0.3
46
μA
μA
Threshold Current Hysteresis
2.5
3.7
5.5
μA
RUN/SS Pin Current
VRUN/SS = 0V
–1.4
–2.8
–4
μA
RUN/SS Switching Threshold
0.15
0.8
1
V
SYNC Threshold Voltage
0.4
0.8
1.3
V
VUV
Reset Threshold
% of FB Voltage, VFB Falling
l
88
90
92
%
tRST
Reset Timeout Period
CPOR = 4700pF
l
21.2
23.5
25.8
ms
tWDU
Watchdog Window Upper Boundary
CWDT = 1000pF
l
18
20
22
ms
tWDL
Watchdog Window Lower Boundary
CWDT = 1000pF
l
0.8
1.25
1.6
ms
tWDTO
Watchdog Timeout Period
CWDT = 1000pF
2.5
ms
RST Output Voltage Low
ISINK = 2.5mA, VFB = 0.6V
ISINK = 100μA, VFB = 0.6V
l
l
0.2
0.01
0.4
0.3
V
V
tUV
UV Detect to RST Asserted
VFB Set to 0.680V
l
410
30
μs
WDI Input Threshold
l
0.4
0.95
1.3
V
WDI Input Pull-Up Current
–2
μA
WDI Input Pulse Width
l
300
ns
WDE Threshold Voltage
l
0.4
0.65
1
V
WDE Input Pull-Down Current
VWDE = 1.2V
3.5
μA
WDO Output Voltage Low
ISINK = 2.5mA
ISINK = 100μA
l
l
0.2
0.01
0.4
0.3
V
V



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