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LTM4609
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
temperature range (Note 2), otherwise specifications are at T A = 25°C, V IN = 12V, per typical application (front page) configuration.
SYMBOL
f HIGH
PARAMETER
Highest Frequency
CONDITIONS
V PLLFLTR = 2.4V
MIN
340
TYP
400
MAX
440
UNITS
kHz
R PLLIN
PLLIN Input Resistance
50
kΩ
I PLLFLTR
Phase Detector Output Current
f PLLIN < f OSC
f PLLIN > f OSC
–15
15
μA
μA
Control Section
V FB
Feedback Reference Voltage
V COMP = 1.2V(–40°C to 85°C)
V COMP = 1.2V (–55°C to 125°C)
l
l
0.792
0.785
0.8
0.8
0.808
0.815
V
V
V RUN
I SS
RUN Pin ON/OFF Threshold
Soft-Start Charging Current
V RUN = 2.2V
1
1.6
–1.7
2.2
–1
V
μA
V STBYMD(START)
V STBYMD(KA)
Start-Up Threshold
Keep-Active Power On Threshold
V STBYMD Rising
V STBYMD Rising, V RUN = 0V
0.4
0.7
1.25
V
V
V FCB
Forced Continuous Threshold
0.76
0.8
0.84
V
I FCB
V BURST
DF (BOOST, MAX)
DF (BUCK, MAX)
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
Maximum Duty Factor
Maximum Duty Factor
V FCB = 0.85V
Measured at FCB Pin
% Switch M4 On
% Switch M1 On
–0.3
–0.2
5.3
99
99
–0.1
5.5
μA
V
%
%
t ON(MIN, BUCK)
RFBHI
Minimum On-Time for Synchronous
Switch in Buck Operation
Resistor Between V OUT and V FB Pins
Switch M1 (Note 6)
99.5
200
100
250
100.5
ns
kΩ
Internal V CC Regulator
INTV CC
Δ V LDO /V LDO
V EXTVCC
Internal V CC Voltage
Internal V CC Load Regulation
EXTV CC Switchover Voltage
V IN = 12V, V EXTVCC = 5V
V IN = 7V, V EXTVCC = 5V
I CC = 0mA to 20mA, V EXTVCC = 5V
I CC = 20mA, V EXTVCC Rising
l
l
l
5.7
5.56
5.4
6
6
0.3
5.6
6.3
6.35
2
V
V
%
V
Δ V EXTVCC(HYS)
EXTV CC Switchover Hysteresis
300
mV
Δ V EXTVCC
EXTV CC Switch Drop Voltage
I CC = 20mA, V EXTVCC = 6V
60
150
mV
Current Sensing Section
V SENSE(MAX)
Maximum Current Sense Threshold
Boost Mode
Buck Mode
l
l
–95
160
–130
190
–150
mV
mV
V SENSE(MIN, BUCK)
I SENSE
Minimum Current Sense Threshold
Sense Pins Total Source Current
Discontinuous Mode
V SENSE– = V SENSE+ = 0V
–6
–380
mV
μA
PGOOD
Δ V FBH
Δ V FBL
Δ V FB(HYS)
V PGL
I PGOOD
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
V FB Rising
V FB Falling
V FB Returning
I PGOOD = 2mA
V PGOOD = 5V
5.5
–5.5
7.5
–7.5
2.5
0.2
10
–10
0.3
1
%
%
%
V
μA
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 LTM4609 is tested under pulsed load conditions such that
T J ≈ T A . The LTM4609E 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 LTM4609I is guaranteed over
the –40°C to 85°C operating temperature range. The LTM4609MP is
guaranteed and tested over the –55°C to 125°C operating temperature
range. For output current derating at high temperature, please refer to
Thermal Considerations and Output Current Derating discussion.
Note 3: See output current derating curves for different V IN , V OUT , and T A .
Note 4: The LTM4609 is tested in a feedback loop that servos V COMP to a
specified voltage and measures the resultant V FB .
Note 5: Turn-on and turn-off time are measured using 10% and 90%
levels. Transition delay time is measured using 50% levels.
Note 6: 100% test at wafer level only.
Note 7: Absolute Maximum Rating of –5V on SW1 and SW2 is under
transient condition only.
4609ff
4
For more information www.linear.com/LTM4609
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