LTC3731HG Linear Technology, LTC3731HG Datasheet - Page 4

• Manufacturer Part Number: LTC3731HG
• Description: IC REG SW SYNC 3PH STPDWN 36SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3731HG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 6 V
• Frequency - Switching: 225kHz ~ 680kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 140°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Not Compliant

LTC3731H
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 LTC3731H is guaranteed to meet specifications over the –40°C
to 140°C operating junction temperature range. Note that the maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Junction temperature (T
and power dissipation PD according to the following formula:
High junction temperatures degrade operating lifetimes. Operating lifetime
at junction temperatures greater than 125°C is derated to 1000 hours. The
LTC3731H is tested under pulsed load conditions such that T
temperature range, otherwise specifications are at T
SYMBOL
Power Good Output Indication
V
I
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
V
R
I
R
CLKOUT

PGOOD
NOM
LOW
HIGH
PLLFLTR
PGL
PGTHNEG
PGTHPOS
PGDLY
PLLTH
PLLIN
RELPHS
LTC3731HG: T
LTC3731HG: T
LTC3731HUH: T
PARAMETER
PGOOD Voltage Output Low
PGOOD Output Leakage
PGOOD Trip Thresholds
Power Good Fault Report Delay
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Threshold
PLLIN Input Resistance
Phase Detector Output Current
Controller 2-Controller 1 Phase
Controller 3-Controller 1 Phase
Controller 1 TG to CLKOUT Phase
V
V
Sinking Capability
Sourcing Capability
J
J
EAIN
EAIN
= T
= T
J
= T
A
CASE
Ramping Negative
Ramping Positive
A
J
+ (P
) is calculated from the ambient temperature T
+ (P
+ (P
D
D
• 70°C/W)
D
• 34°C/W)
• 25°C/W)
CONDITIONS
I
I
V
V
Goes Low After V
After V
V
V
V
Minimum Pulse Width > 100ns
f
f
PHASMD = 0V
PHASMD = 5V
PGOOD
PGOOD
PLLIN
PLLIN
PGOOD
EAIN
PLLFLTR
PLLFLTR
PLLFLTR
with Respect to Set Output Voltage, PGOOD
A
< f
> f
J
EAIN
= 2mA, G Package
= 1.6mA, UH Package
≈ T
= 5V
= 25°C. V
OSC
OSC
= 1.2V
= 0V
= 2.4V
A
is Forced Outside the PGOOD Thresholds
.
The
A
UVDLY
l
CC
denotes the specifications which apply over the full operating
= V
Delay
Note 3: The IC is tested in a feedback loop that servoes the error amplifier
output voltage to its midrange point (V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: The minimum on-time condition corresponds to an inductor
peak-to-peak ripple current of ≥40% of I
considerations in the Applications Information Section).
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Overtemperature protection becomes active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
RUN/SS
= 5V unless otherwise noted.
MIN
360
190
600
–7
7
ITH
MAX
= 1.2V).
(see minimum on-time
TYP
–10
100
400
225
680
120
240
0.1
0.5
10
50
20
20
30
60
1
MAX
–13
150
440
260
750
0.3
13
1
1
3731Hfb
UNITS
Deg
Deg
Deg
Deg
kHz
kHz
kHz
kΩ
µA
µA
µA
µs
%
%
V
V
V