Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. (Note 3) V
IN
= 12V, unless otherwise noted.
SYMBOL
V
IN
V
OUT
I
VIN
PARAMETER
Operating Voltage
Operating Voltage
Input Quiescent Current
Shutdown Mode, V
RUN
= 0V
Burst Mode Operation
Forced Continuous Mode (Note 4), V
FB
< 0.6V
LTC3621/LTC3621-2
l
elecTrical characTerisTics
CONDITIONS
MIN
2.7
0.6
TYP
MAX
17
V
IN
UNITS
V
V
µA
µA
mA
V
V
nA
V
V
V
V
µA
%/V
%
µA
µA
Ω
Ω
%
ns
0.1
3.5
1.5
0.594
0.591
3.267
3.250
4.950
4.925
0.6
0.6
3.3
3.3
5.0
5.0
2
0.01
0.1
0.1
0.1
1.0
7
V
FB
I
FB
V
OUT
Regulated Feedback Voltage
FB Input Current
Regulated Fixed Output Voltage
0.606
0.609
10
3.333
3.350
5.050
5.075
10
0.015
1
1
LTC3621/LTC3621-2
LTC3621-3.3/LTC3621-23.3
l
LTC3621-5/LTC3621-25
l
I
FB(VOUT)
Feedback Input Leakage Current
Fixed Output Versions
V
IN
= 2.7V to 17V (Note 5)
(Note 5)
ΔV
LINE(REG)
Reference Voltage Line Regulation
ΔV
LOAD(REG)
Output Voltage Load Regulation
I
LSW
R
DS(ON)
D
MAX
t
ON(MIN)
V
RUN
I
RUN
NMOS Switch Leakage
PMOS Switch Leakage
NMOS On-Resistance (Bottom FET)
PMOS On-Resistance (Top FET)
Maximum Duty Cycle
Minimum On-Time
RUN Input High Threshold
RUN Input Low Threshold
RUN Input Current
V
IN
= 5V
V
FB
= 0.5V, V
MODE/SYNC
= 1.5V
l
0.15
0.37
100
60
0.3
1.0
0
20
V
V
nA
3621fc
V
RUN
= 12V
For more information
www.linear.com/LTC3621
3
LTC3621/LTC3621-2
elecTrical characTerisTics
SYMBOL
PARAMETER
V
MODE/SYNC
Pulse-Skipping Mode
Burst Mode Operation
Forced Continuous Mode
I
MODE/SYNC
t
SS
I
LIM
V
UVLO
V
UVLO(HYS)
V
OVLO
V
OVLO(HYS)
f
OSC
MODE/SYNC Input Current
Internal Soft-Start Time
Peak Current Limit
(E/I-Grade)
(H-Grade)
V
IN
Ramping Up
l
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. (Note 3) V
IN
= 12V, unless otherwise noted.
CONDITIONS
MIN
V
INTVCC
– 0.4
1.0
0
0.8
1.44
1.30
1.2
2.4
18
0.92
0.82
0.78
2.05
1.8
1.7
60
V
IN
> 4V
PGOOD R
DS(ON)
at 500µA
PGOOD Low to High
PGOOD High to Low
3.6
±7.5
275
0
32
100
±12.5
350
1.60
1.76
1.80
1.80
2.7
20
1.08
1.16
1.16
2.45
2.6
2.6
140
TYP
MAX
0.3
V
INTVCC
– 1.2
20
UNITS
V
V
V
nA
ms
A
A
A
V
mV
V
mV
MHz
MHz
MHz
MHz
MHz
MHz
%
V
%
Ω
Cycles
Cycles
nA
V
INTVCC
Undervoltage Lockout
V
INTVCC
Undervoltage Lockout Hysteresis
V
IN
Overvoltage Lockout Rising
V
IN
Overvoltage Lockout Hysteresis
Oscillator Frequency
2.6
250
19
300
1.00
LTC3621/LTC3621-3.3/LTC3621-5
(E/I-Grade)
(H-Grade)
LTC3621-2/LTC3621-23.3/LTC3621-25
(E/I-Grade)
(H-Grade)
l
l
l
l
2.25
f
SYNC
V
INTVCC
ΔV
PGOOD
R
PGOOD
t
PGOOD
I
PGOOD
SYNC Capture Range
V
INTVCC
LDO Output Voltage
Power Good Range
Power Good Resistance
PGOOD Delay
PGOOD Leakage Current
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:
Transient absolute maximum voltages should not be applied for
more than 4% of the switching duty cycle.
Note 3:
The LTC3621 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3621E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3621I is guaranteed over the –40°C to 125°C operating junction
temperature range, and the LTC3621H is guaranteed over the –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes; operating lifetime is derated for junction
temperatures greater than 125°C. 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 impedance and other environmental factors.
Note 4:
The quiescent current in forced continuous mode does not include
switching loss of the power FETs.
Note 5:
The LTC3621 is tested in a proprietary test mode that connects V
FB
to the output of error amplifier.
Note 6:
T
J
is calculated from the ambient, T
A
, and power dissipation, P
D
,
according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
Note 7:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
I went into the item store and wanted to buy some items, but I didn't expect that the load capacity was insufficient. The user's load capacity was only 10, but the minimum weight of the item was 20......
1. LTE Technology OverviewLTE is a new generation of communication system based on multiple antennas (MIMO) and orthogonal frequency division multiplexing (OFDM) launched by 3GPP, a mobile communicati...
Please tell me!! Why can’t I enter the interrupt? ? I used P1.0 as external interrupt #includemain() { WDTCTL=WDTPW+WDTHOLD; P1IES= 0x01; 0x01; P2OUT=0Xfe; P1IFG=0x00; }...
Is there anyone familiar with LPC4357? Does this chip support software interrupts? Now I want to generate a manually triggered interrupt, is there any better way?...
Walking on the crowded Fourth Ring Road in the morning, although the Fourth Ring Road was full of Monday morning rush hour congestion, listening to the special program on earthquake relief on the traf...
1. Introduction
RFID (radio frequency identification) is a non-contact automatic identification technology that emerged in the 1990s. It uses the characteristics of radio frequency signal prop...[Details]
Microchip's PIC18F46J50 is a low-power, high-performance 8-bit USB microcontroller (MCU) using nanoWatt XLP technology. The current in deep sleep mode can be as low as 13nA, the operating voltage i...[Details]
As a wireless broadband metropolitan area network standard, WiMAX technology has greater advantages than previous 3.5GHz MMDS products in terms of non-line-of-sight transmission and spectrum utiliz...[Details]
As LEDs continue to improve in almost every aspect of performance and cost, LED lighting is being used in an increasingly wide range of applications, among which LED street lights are a focus of in...[Details]
Two simple circuits are implemented to drive two LEDs from a battery powered microprocessor.
This design is based on a circuit that uses three resistors and a microprocessor I/O pin as an input h...[Details]
Electronic systems are located at different points on the automotive power bus and therefore often need to operate under very stringent power requirements. These include load dump, cold crank, very lo...[Details]
Power management solutions for today's portable application processors are becoming increasingly integrated. Total power consumption, standby and sleep current consumption affect battery size, bill...[Details]
The data collector of the automatic weather station is generally designed based on a single-chip microcomputer or a PC/104 bus controller. It has the characteristics of good compatibility with PC, low...[Details]
AD8205 is
a single-supply high-performance differential
amplifier
launched by
Analog
Devices of the United States
. The typical single-supply voltage is 5V, and its common-mode volta...[Details]
Microcalorimetry
is used to determine energy relationships. Microcalorimetry techniques are often required when performing calorimetric experiments with small sample sizes or slow heating rat...[Details]
1. Background:
The instrument system parameter detection and control of the chemical production workshop of Tangshan Coal Gas Coking Plant are all analog instruments, some of which are eve...[Details]
1. Introduction
Testing the temperature of steel billets before rolling is an important measure to ensure the quality of steel. Traditional manual testing is difficult to ensure product qu...[Details]
D5026A is a driver IC designed by Shanghai Debei Electronics for energy-saving LED display screens. Its design concept is energy-saving and compatible with existing solutions, that is, it can be ...[Details]
To understand how and why OLED power supply affects display image quality, you must first understand OLED display technology and power supply requirements. This article will explain the latest OLED...[Details]
introduction
Incandescent bulbs can emit a variety of light, but in specific applications, only green, red, and yellow light are usually needed - such as traffic lights. If an incand...[Details]
Suggestions & Announcements
京公网安备 11010802033920号
EEWORLD
