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LTC3834EGN-1-TRPBF Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3834EGN-1-TRPBF
Description  30關A IQ Synchronous Step-Down Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3834EGN-1-TRPBF Datasheet(HTML) 3 Page - Linear Technology

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3
LTC3834-1
38341f
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VLOADREG
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop; I TH Voltage = 1.2V to 0.7V
0.1
0.5
%
Measured in Servo Loop; I TH Voltage = 1.2V to 2V
– 0.1
– 0.5
%
gm
Transconductance Amplifier gm
ITH = 1.2V; Sink/Source 5μA (Note 4)
0.5
mmho
IQ
Input DC Supply Current
(Note 5)
Sleep Mode
RUN = 5V, VFB = 0.83V (No Load)
30
50
μA
Shutdown
VRUN = 0V
4
10
μA
UVLO
Undervoltage Lockout
VIN Ramping Down
3.7
4
V
VOVL
Feedback Overvoltage Lockout
Measured at VFB Relative to Regulated VFB
810
12
%
ISENSE
Sense Pins Total Source Current
VSENSE– = VSENSE+ = 0V
–220
μA
DFMAX
Maximum Duty Factor
In Dropout
98
99.4
%
ITRACK/SS
Soft-Start Charge Current
VTRACK = 0V
0.85
1.1
1.45
μA
VRUN ON
RUN Pin ON Threshold
VRUN1, VRUN2 Rising
0.5
0.7
0.9
V
VSENSE(MAX)
Maximum Current Sense Threshold
VFB = 0.7V, VSENSE– = 3.3V
85
100
115
mV
TG Transition Time:
(Note 6)
TG1, 2 tr
Rise Time
CLOAD = 3300pF
50
90
ns
TG1, 2 tf
Fall Time
CLOAD = 3300pF
50
90
ns
BG Transition Time:
(Note 6)
BG1, 2 tr
Rise Time
CLOAD = 3300pF
40
90
ns
BG1, 2 tf
Fall Time
CLOAD = 3300pF
40
80
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF
70
ns
Synchronous Switch-On Delay Time
BG/TG t2D
Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF
70
ns
Top Switch-On Delay Time
tON(MIN)
Minimum On-Time
(Note 7)
200
ns
INTVCC Linear Regulator
VINTVCCVIN
Internal VCC Voltage
8.5V < VIN < 30V
5.0
5.25
5.5
V
VLDOVIN
INTVCC Load Regulation
ICC = 0mA to 20mA
0.2
1.0
%
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
VPLLLPF = No Connect
360
400
440
kHz
fLOW
Lowest Frequency
VPLLLPF = 0V
220
250
280
kHz
fHIGH
Highest Frequency
VPLLLPF = INTVCC
475
530
580
kHz
fSYNCMIN
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V
115
140
kHz
fSYNCMAX
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V
650
800
kHz
IPLLLPF
Phase Detector Output Current
Sinking Capability
fPLLIN/MODE < fOSC
–5
μA
Sourcing Capability
fPLLIN/MODE > fOSC
5
μA
The
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LTC3834E-1 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with statistical
process controls. The LTC3834I-1 is guaranteed to meet performance
specifications over the –40°C to 85°C operating temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3834GN-1: TJ = TA + (PD • 90°C/W)
LTC3834DHC-1: TJ = TA + (PD • 43.5°C/W)
Note 4: The LTC3834-1 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current 40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).


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