LTM4603 LINER [Linear Technology], LTM4603 Datasheet - Page 4

• Manufacturer Part Number: LTM4603
• Description: 36VIN, 34VOUT High Efficiency Buck-Boost DC/DC
• Manufacturer: LINER [Linear Technology]

electrical characteristics
LTM4609
temperature range (Note 2), otherwise specifications are at T
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
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
4
SYMBOL
f
R
I
Control Section
V
V
I
V
V
V
I
V
DF
DF
t
RFBHI
Internal V
INTV
ΔV
V
ΔV
ΔV
Current Sensing Section
V
V
I
PGOOD
ΔV
ΔV
ΔV
V
I
HIGH
PLLFLTR
SS
FCB
ON(MIN, BUCK)
SENSE
PGOOD
J
FB
RUN
STBYMD(START)
STBYMD(KA)
FCB
BURST
EXTVCC
SENSE(MAX)
SENSE(MIN, BUCK)
PLLIN
PGL
(BOOST, MAX)
(BUCK, MAX)
≈ T
LDO
EXTVCC(HYS)
EXTVCC
FBH
FBL
FB(HYS)
CC
A
/V
. The LTM4609E is guaranteed to meet performance specifications
LDO
CC
Regulator
PARAMETER
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
Feedback Reference Voltage
RUN Pin ON/OFF Threshold
Soft-Start Charging Current
Start-Up Threshold
Keep-Active Power On Threshold
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
Maximum Duty Factor
Maximum Duty Factor
Minimum On-Time for Synchronous
Switch in Buck Operation
Resistor Between V
Internal V
Internal V
EXTV
EXTV
EXTV
Maximum Current Sense Threshold
Minimum Current Sense Threshold
Sense Pins Total Source Current
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
CC
CC
CC
Switchover Voltage
Switchover Hysteresis
Switch Drop Voltage
CC
CC
Voltage
Load Regulation
OUT
and V
FB
Pins
CONDITIONS
V
f
f
V
V
V
V
V
V
Measured at FCB Pin
% Switch M4 On
% Switch M1 On
Switch M1 (Note 6)
V
I
I
I
Boost Mode
Buck Mode
Discontinuous Mode
V
V
V
V
I
V
PLLIN
PLLIN
CC
CC
CC
PGOOD
PLLFLTR
COMP
COMP
RUN
STBYMD
STBYMD
FCB
IN
SENSE
FB
FB
FB
PGOOD
= 0mA to 20mA, V
= 20mA, V
= 20mA, V
> 7V, V
Rising
Falling
Returning
= 0.85V
= 2.2V
< f
> f
–
= 1.2V(–40°C to 85°C)
= 1.2V (–55°C to 125°C)
The
= 2mA
= 5V
= V
OSC
OSC
= 2.4V
Rising
Rising, V
A
EXTVCC
= 25°C, V
SENSE
l
EXTVCC
EXTVCC
denotes the specifications which apply over the specified operating
+
= 5V
RUN
= 0V
Thermal Considerations and Output Current Derating discussion. High
junction temperatures degrade operating lifetimes; operating lifetime is
derated for junction temperatures greater than 125°C.
Note 3: See Application Note 100.
Note 4: The LTM4609 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
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.
Rising
= 6V
EXTVCC
IN
= 0V
= 12V, per typical application (front page) configuration.
= 5V
l
l
l
l
l
l
0.792
0.785
0.76
–0.3
99.5
–5.5
MIN
340
–95
0.4
5.7
5.4
5.5
1
1
–130
–380
1.25
–0.2
–7.5
TYP
400
–15
200
100
300
160
0.8
0.8
1.6
1.7
0.7
0.8
5.3
0.3
5.6
7.5
2.5
0.2
FB
–6
50
15
99
99
60
6
.
0.808
0.815
100.5
–150
MAX
0.84
–0.1
440
250
150
190
–10
2.2
5.5
6.3
0.3
10
2
1
COMP
UNITS
to a
4609fc
kHz
mV
mV
mV
mV
mV
kΩ
kΩ
µA
µA
µA
µA
µA
µA
ns
%
%
%
%
%
%
V
V
V
V
V
V
V
V
V
V