LTC3807_15 Datasheet, PDF (3/32 Pages) Linear Technology – Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability

LTC3807
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3807HFE#PBF
LTC3807HFE#TRPBF
LTC3807FE
20-Lead Plastic TSSOP
–40°C to 150°C
LTC3807MPFE#PBF
LTC3807MPFE#TRPBF
LTC3807FE
20-Lead Plastic TSSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
operating junction temperature range, otherwise specifications are at T_A = 25°C (Note 2), V_IN = 12V, V_RUN = 5V, EXTV_CC = 0V unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
Input Supply Operating Voltage Range
V_OUT
Regulated Output Voltage Range
V_FB
Regulated Feedback Voltage
(Note 4); I_TH Voltage = 1.2V
–40°C to 85°C
LTC3807E, LTC3807I
LTC3807H, LTC3807MP
4
38
V
0.8
24
V
0.792 0.800 0.808
V
l 0.788 0.800 0.812
V
l 0.786 0.800 0.812
V
I_FB
Feedback Current
(Note 4)
±5
±50
nA
Reference Voltage Line Regulation
(Note 4); V_IN = 4.5V to 38V
0.002 0.02
%/V
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop;
∆I_TH Voltage = 1.2V to 0.7V
l
0.01
0.1
%
(Note 4)
Measured in Servo Loop;
∆I_TH Voltage = 1.2V to 2V
l
–0.01 –0.1
%
g_m
Transconductance Amplifier g_m
(Note 4); I_TH = 1.2V; Sink/Source 5µA
2
mmho
I_Q
Input DC Supply Current
(Note 5)
Pulse Skip or Forced Continuous Mode V_FB = 0.83V (No Load)
2
mA
Sleep Mode
V_FB = 0.83V (No Load)
50
75
µA
Shutdown
RUN = 0V
14
25
µA
UVLO
Undervoltage Lockout
Feedback Overvoltage Protection
SENSE⁺ Pin Current
SENSE^– Pins Current
Maximum Duty Factor
INTV_CC Ramping Up
INTV_CC Ramping Down
l
3.92
4.2
V
l 3.6
3.80
4.0
V
Measured at V_FB Relative to Regulated V_FB
7
10
13
%
±1
µA
VV_{SSEENNSSEE––}
<
>
INTV_CC
INTV_CC
–
+
0.5V
0.5V
±2
µA
700
µA
In Dropout
98
99
%
Soft-Start Charge Current
V_TRACK = 0V
7
10
14
µA
V_RUN On
RUN Pin On Threshold
V_RUN Rising
l 1.15 1.21 1.27
V
V_RUN Hyst
RUN Pin Hysteresis
50
mV
V_SENSE(MAX)
Maximum Current Sense Threshold
V_FB
V_FB
V_FB
=
=
=
0.7V,
0.7V,
0.7V,
VVV_{SSSEEENNNSSSEEE–––}
=
=
=
3.3V,
3.3V,
3.3V,
I_LIM
I_LIM
I_LIM
=
=
=
0
INTV_CC
FLOAT
l
l
l
22
43
64
30
50
75
36
57
85
mV
mV
mV
3807f
For more information www.linear.com/LTC3807
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