Datasheet

LTM4637
4
4637fc
For more information www.linear.com/LTM4637
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage V
OSNS
+
= V
DIFF_OUT
= 1.5V, I
DIFF_OUT
= 100µA 2 mV
A
V
Differential Gain (Note 7) 1 V/V
SR Slew Rate (Note 6) 2 V/µs
GBP Gain Bandwidth Product (Note 6) 3 MHz
CMRR Common Mode Rejection (Note 7) 60 dB
I
DIFF_OUT
DIFF_OUT Current Sourcing 2 mA
PSRR Power Supply Rejection
Ratio
5V < V
IN
< 20V (Note 7) 100 dB
R
IN
Input Resistance V
OSNS
+ to GND 80 kΩ
PGOOD Output
V
PGOOD
PGOOD Trip Level V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
–10
10
%
%
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
INTV
CC
Linear Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 20V 4.8 5 5.2 V
V
INTVCC
Load Reg INTV
CC
Load Regulation I
CC
= 0 to 50mA 0.5 %
V
EXTVCC
External V
CC
Switchover EXTV
CC
Ramping Positive
l
4.5 4.7 V
VLDO Ext EXTV
CC
Voltage Drop I
CC
= 25mA, V
EXTVCC
= 5V 50 100 mV
Oscillator and Phase-Locked Loop
f
SYNC
Frequency Sync Capture
Range
MODE_PLLIN Clock Duty Cycle = 50% 250 800 kHz
f
NOM
Nominal Frequency V
fSET
= 1.2V 450 500 550 kHz
f
LOW
Lowest Frequency V
fSET
= 0V 210 250 290 kHz
f
HIGH
Highest Frequency V
fSET
≥ 2.4V 700 770 850 kHz
I
FREQ
Frequency Set Current 9 10 11 µA
R
MODE_PLLIN
MODE_PLLIN Input
Resistance
250 kΩ
V
IH_MODE_PLLIN
Clock Input Level High 2.0 V
V
IL_MODE_PLLIN
Clock Input Level Low 0.8 V
Temperature Diode
V
TEMP
TEMP Diode Voltage I
TEMP
= 100µA 0.6 V
TC V
TEMP
Temperature Coefficient
l
–2.0 mV/°C
elecTrical characTerisTics
The l denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 12V, per the typical application in Figure 22.
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 LTM4637 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4637E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4637I is guaranteed to meet specifications over the
full –40°C to 125°C internal operating temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
Note 3: The minimum on-time condition is specified for a peak-to-peak
inductor ripple current of ~40% of I
MAX
Load. (See the Applications
Information section)
Note 4: See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 5: Limit current into the RUN pin to less than 2mA.
Note 6: Guaranteed by design.
Note 7: 100% tested at wafer level.