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LTM4605
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C (Note 2), V IN = 12V. Per typical application (front page) con?guration.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Control Section
V FB
V RUN
I SS
V STBYMD(START)
Feedback Reference Voltage
RUN Pin ON/OFF Threshold
Soft-Start Charging Current
Start-Up Threshold
V COMP = 1.2V
V RUN = 2.2V
V STBYMD Rising
l
0.792
1
1
0.4
0.8
1.6
1.7
0.7
0.808
2.2
V
V
μA
V
V STBYMD(KA)
Keep-Active Power On Threshold
V STBYMD Rising, V RUN = 0V
1.25
V
V FCB
Forced Continuous Threshold
0.76
0.8
0.84
V
I FCB
V BURST
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
V FCB = 0.85V
Measured at FCB Pin
–0.3
–0.2
5.3
–0.1
5.5
μA
V
Threshold
DF (BOOST, MAX)
DF (BUCK, MAX)
Maximum Duty Factor
Maximum Duty Factor
% Switch M4 On
% Switch M1 On
99
99
%
%
t ON(MIN, BUCK)
Minimum On-Time for Synchronous
Switch M1 (Note 5)
200
250
ns
Switch in Buck Operation
RFBHI
Resistor Between V OUT and V FB Pins
99.5
100
100.5
k Ω
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 > 7V, V EXTVCC = 5V
I CC = 0mA to 20mA, V EXTVCC = 5V
I CC = 20mA, V EXTVCC Rising
l
l
5.7
5.4
6
0.3
5.6
6.3
2
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 LTM4605E is guaranteed to meet speci?cations from the 0°C
to 85°C operating temperature range. Speci?cations over the –40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTM4605I is
Note 3: The LTM4605 is tested in a feedback loop that servos V COMP to a
speci?ed voltage and measures the resultant V FB .
Note 4: Turn-on and turn-off time are measured using 10% and 90%
levels. Transition delay time is measured using 50% levels.
Note 5: 100% tested at wafer level only.
Note 6: Absolute Maximum Rating of –5V on SW1 and SW2 is under
transient condition only.
guaranteed over the –40°C to 85°C operating temperature range.
4605fc
4
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