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LT8697 Datasheet, PDF (3/28 Pages) Linear Dimensions Semiconductor – USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
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LT8697
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 4)
PARAMETER
CONDITIONS
USB5V Current
Current Sense Voltage (VISP – VISN)
RCBL Monitor Voltage
RCBL Output Current Limit
ISP, ISN Bias Current
ICTRL Current
INTVCC Voltage
INTVCC Undervoltage Lockout
SYS Voltage
SYS Voltage to Disable Forced Continuous Mode
VISN = 5V, VISP – VISN = 40mV, RCBL = 13.7k
VISN = 5V, VISP – VISN = 10mV, RCBL = 13.7k
VISN = 5V, VISP – VISN = 0V, RCBL = 13.7k
RCBL = Open
VCTRL = 1.5V, VISN = 5V
VCTRL = 1.5V, VISN = 0V
VCTRL = 800mV, VISN = 5V
VCTRL = 800mV, VISN = 0V
VCTRL = 200mV, VISN = 5V
VCTRL = 200mV, VISN = 0V
VISP – VISN = 40mV, RCBL = 13.7k
VISP – VISN = 10mV, RCBL = 13.7k
VISP – VISN = 50mV, VRCBL = 0V
VISP = VISN = 0V, 5V
VICTRL = 1.5V
VSYS = 0V, 5V
VIN = 12V
SYS Current in Regulation
Dropout Voltage (VIN – VSYS)
Maximum Duty Cycle in Dropout
VSYS = 5V, RT = 56.2k
VSYS = 5V, ILOAD = 2.1A
Minimum On-Time
Minimum Off-Time
Minimum VIN for SYS Regulation at Full Frequency
Oscillator Frequency
Top Power NMOS On-Resistance
Top Power NMOS Current Limit
ILOAD = 1A
ILOAD = 0.5A
RT = 16.5k, VUSB5V = 0V, ILOAD = 0.5A
RT = 140k
RT = 56.2k
RT = 16.5k
ISW = 1A
Bottom Power NMOS On-Resistance
Bottom Power NMOS Current Limit
SW Leakage Current
EN/UV Threshold
EN/UV Hysteresis
VINTVCC = 3.4V, ISW = 1A
VINTVCC = 3.4V
VIN = 42V, VSW = 0V, 42V
VEN/UV Rising
EN/UV Bias Current
PG Upper Threshold Offset from VUSB5V
PG Lower Threshold Offset from VUSB5V
PG Hysteresis
VEN/UV = 2V
VUSB5V Falling
VUSB5V Rising
PG Pull-Down Resistance
PG Transition Delay
SYNC Threshold
SYNC Current
TR/SS Current
TR/SS Pull-Down Resistance
VPG = 0.1V
VUSB5V from 5V to 4V
VSYNC Falling
VSYNC Rising
VSYNC = 2V
VTR/SS = 0V
Fault Condition, VTR/SS = 0.1V
MIN TYP MAX
UNIT
l 58
60
62
µA
l 12
15
23
µA
l0
2
8
µA
l0
1
2
µA
l 45.5 48
50
mV
l 44.5 48.5
53
mV
l 37.5 39.5
42
mV
l 36
40
44.5
mV
l6
9.5
13
mV
l5
10
15
mV
l 720 800
880
mV
l 130 205
280
mV
–2
–3
–4
mA
–20
20
µA
–0.5 –2
–3
µA
3.4
V
2.6 2.9
3.15
V
l 5.63 5.8
5.92
V
7.5
V
l3
4
5
mA
450
mV
96 97.5
99
%
l 30
45
70
ns
50
80
110
ns
l 6.2
7
7.9
V
l 250 300
340
kHz
l 620 700
750
kHz
l 1.9 2.00 2.05
MHz
120
mΩ
l 3.2 4.8
6
A
65
mΩ
3.5 4.5
5.8
A
0.1
5
µA
l 0.94 1.0
1.06
V
40
mV
–20
20
nA
l6
9
12
%
l –6
–9
–12
%
1.3
%
l
680 2000
Ω
40
µs
0.8 1.1
1.4
V
1.6 2.0
2.4
V
–40
40
nA
–1.2 –2.2 –3.2
µA
230
Ω
8697p
For more information www.linear.com/LT8697
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