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Linear Technology Electronic Components Datasheet

LT1619 Datasheet

Low Voltage Current Mode PWM Controller

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FEATURES
s Wide VIN Range: 1.9V to 18V
s 300kHz Fixed Frequency Current Mode Control
s 1A Rail-to-Rail N-Channel MOSFET Driver
s Low 53mV Current Limit Threshold Voltage
Improves Efficiency
s Implements Boost, SEPIC and Flyback Converters
Requiring Low Side Power Transistors
s Internal Current Sense Amplifier
with Leading Edge Blanking
s Up to 500kHz External Synchronization
s Burst Mode® Operation for High Efficiency
at Light Load
s 140µA Quiescent Current
s 15µA Shutdown Current
s 8-Lead MSOP and SO Packages
U
APPLICATIO S
s 3.3V to 5V DC/DC Converters
s Distributed Power Supplies
s Isolated Power Supplies
LT1619
Low Voltage Current Mode
PWM Controller
DESCRIPTIO
The LT®1619 is a fixed frequency PWM controller for
implementing current mode DC/DC converters with mini-
mum external parts. The LT1619 operates with input
voltages ranging from 1.9V to 18V and is suitable for a
variety of battery-powered and distributed DC/DC con-
verters. The internal rail-to-rail N-channel MOSFET driver
operates either from the input in the nonbootstrapped
mode or from the output in bootstrapped operation. The
driver is designed to drive a low side power transistor in
boost, SEPIC, flyback and other topologies.
Converter efficiency is improved at heavy loads with a
53mV current sense voltage and at light load with Burst
Mode operation. The operating frequency is internally set
at 300kHz. The oscillator can also be synchronized exter-
nally up to 500kHz. No load quiescent current is 140µA and
shutdown current is 15µA.
The LT1619 is available in 8-lead MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
3.3V
37.4k
12.4k
220pF
75k
15nF
1
S/S
8
VIN
2
FB
7
DRV
LT1619
36
VC GATE
45
GND SENSE
C1: PANASONIC EEFCDOK220R
COUT: KEMET T495X227K010AS (×2)
D1: MBRD835L
L1: COILCRAFT DO5022P-562
+
0.1µF
C1
22µF
0.1µF
L1
5.6µH
5A
M1
Si9804
D1
+
RSENSE
0.01
1619 F01
VOUT
5V
2.2A
COUT
440µF
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter
Efficiency
95
90
85
80
75
70
1
10 100
LOAD CURRENT (mA)
1000
1619 F01a
1619fa
1


Linear Technology Electronic Components Datasheet

LT1619 Datasheet

Low Voltage Current Mode PWM Controller

No Preview Available !

LT1619
ABSOLUTE AXI U RATI GS (Note 1)
Input Voltage (VIN) ................................... – 0.3V to 20V
Gate Drive Supply Voltage (DRV) ............. – 0.3V to 20V
Shutdown/Synch Voltage (S/S) ................ – 0.3V to 20V
Feedback Voltage (FB) .............................................. VIN
Compensation Voltage (VC) ...................................... 3V
Gate Drive Output Current (GATE) ........................ ±1.5A
Current Sense Voltage (SENSE) ................. – 0.5V to VIN
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
S/S 1
FB 2
VC 3
GND 4
8 VIN
7 DRV
6 GATE
5 SENSE
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/ W
ORDER PART
NUMBER
LT1619EMS8
MS8 PART MARKING
LTHC
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
S/S 1
FB 2
VC 3
GND 4
8 VIN
7 DRV
6 GATE
5 SENSE
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/ W
ORDER PART
NUMBER
LT1619ES8
S8 PART MARKING
1619
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = VDRV = 2.5V, VS/S = VIN, COMP open, VSENSE = 0V unless otherwise noted.
PARAMETER
Reference Voltage
Reference Line Regulation
FB Input Bias Current
Error Amplifier Transconductance
Error Amplifier Output Source Current
Error Amplifier Output Sink Current
Error Amplifier Clamp Voltage
Undervoltage Lockout Threshold
Input Voltage Range
Switching Frequency
Synchronization Frequency Range
Maximum Duty Cycle
Current Limit Threshold
Burst Mode Operation Current Limit
CONDITIONS
Measured at the FB Pin
1.9V VIN 18V
VFB = VREF
VFB = 1V, VCOMP = 1V
VFB = 1.5V, VCOMP = 1V
VFB = 1V
1.9V VIN 18V
MIN TYP MAX
q 1.22 1.24 1.26
0.004 0.05
10 25
80 170 260
4 8.7 14
4 8.7 14
1.6 2.2
1.65 1.85
q 1.9
18
q 220 300 360
370 500
q 88
92
q 40 53 66
10
UNITS
V
%/V
nA
µΩ – 1
µA
µA
V
V
V
kHz
kHz
%
mV
mV
1619fa
2


Part Number LT1619
Description Low Voltage Current Mode PWM Controller
Maker Linear Technology
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LT1619 Datasheet PDF






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