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LT1619EMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LT1619
1619fa
Low Voltage Current Mode
PWM Controller
, LTC and LT are registered trademarks of Linear Technology Corporation.
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.
■
Wide V
IN
Range: 1.9V to 18V
■
300kHz Fixed Frequency Current Mode Control
■
1A Rail-to-Rail N-Channel MOSFET Driver
■
Low 53mV Current Limit Threshold Voltage
Improves Efficiency
■
Implements Boost, SEPIC and Flyback Converters
Requiring Low Side Power Transistors
■
Internal Current Sense Amplifier
with Leading Edge Blanking
■
Up to 500kHz External Synchronization
■
Burst Mode
®
Operation for High Efficiency
at Light Load
■
140µA Quiescent Current
■
15µA Shutdown Current
■
8-Lead MSOP and SO Packages
■
3.3V to 5V DC/DC Converters
■
Distributed Power Supplies
■
Isolated Power Supplies
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter
Burst Mode is a registered trademark of Linear Technology Corporation.
LOAD CURRENT (mA)
75
EFFICIENCY (%)
80
85
90
95
1 100 1000
1619 F01a
70
10
Efficiency
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
0.1µF
0.1µF
15nF
220pF
V
IN
3.3V
L1
5.6µH
5A
D1
M1
Si9804
V
OUT
5V
2.2A
R
SENSE
0.01Ω
1619 F01
75k
37.4k
12.4k
C1
22µF
C1: PANASONIC EEFCDOK220R
C
OUT
: KEMET T495X227K010AS (×2)
D1: MBRD835L
L1: COILCRAFT DO5022P-562
+
C
OUT
440µF
S/S
FB
V
C
GND
8
7
6
5
1
2
3
4
V
IN
DRV
GATE
SENSE
LT1619
2
LT1619
1619fa
Input Voltage (V
IN
) ................................... –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) .............................................. V
IN
Compensation Voltage (V
C
) ...................................... 3V
Gate Drive Output Current (GATE) ........................ ±1.5A
Current Sense Voltage (SENSE) .................–0.5V to V
IN
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
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 200°C/W
T
JMAX
= 125°C, θ
JA
= 120°C/W
(Note 1)
ORDER PART
NUMBER
MS8 PART MARKING
LT1619EMS8
LTHC
1
2
3
4
S/S
FB
V
C
GND
8
7
6
5
V
IN
DRV
GATE
SENSE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
ORDER PART
NUMBER
S8 PART MARKING
LT1619ES8
1619
1
2
3
4
8
7
6
5
TOP VIEW
V
IN
DRV
GATE
SENSE
S/S
FB
V
C
GND
S8 PACKAGE
8-LEAD PLASTIC SO
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage Measured at the FB Pin ● 1.22 1.24 1.26 V
Reference Line Regulation 1.9V ≤ V
IN
≤ 18V 0.004 0.05 %/V
FB Input Bias Current V
FB
= V
REF
10 25 nA
Error Amplifier Transconductance 80 170 260 µΩ
–1
Error Amplifier Output Source Current V
FB
= 1V, V
COMP
= 1V 4 8.7 14 µA
Error Amplifier Output Sink Current V
FB
= 1.5V, V
COMP
= 1V 4 8.7 14 µA
Error Amplifier Clamp Voltage V
FB
= 1V 1.6 2.2 V
Undervoltage Lockout Threshold 1.65 1.85 V
Input Voltage Range ● 1.9 18 V
Switching Frequency 1.9V ≤ V
IN
≤ 18V ● 220 300 360 kHz
Synchronization Frequency Range 370 500 kHz
Maximum Duty Cycle ● 88 92 %
Current Limit Threshold ● 40 53 66 mV
Burst Mode Operation Current Limit 10 mV
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= V
DRV
= 2.5V, V
S/S
= V
IN
, COMP open, V
SENSE
= 0V unless otherwise noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
3
LT1619
1619fa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Input Current V
SENSE
= 0V ● –90 –120 –150 µA
Current Limit Delay 150 ns
Driver Output Rise Time C
L
= 3300pF 30 ns
Driver Output Fall Time C
L
= 3300pF 35 ns
Driver Output High Level I
OUT
= –20mA V
DRV
– 0.6 V
DRV
– 0.35 V
I
OUT
= –200mA V
DRV
– 1.6 V
DRV
– 1.2 V
Driver Output Low Level I
OUT
= 20mA 100 200 mV
I
OUT
= 200mA 0.5 0.7 V
Shutdown Driver Output Level V
S/S
= 0V, I
OUT
= 20mA 100 200 mV
Idle Mode Driver Output Level V
S/S
= V
IN
, V
FB
= 1.5V, I
OUT
= 20mA 100 200 mV
S/S Pin Current V
S/S
= V
IN
4 µA
V
S/S
= 0V –2 µA
Operating Supply Current V
FB
= 1V 9 mA
Quiescent Supply Current V
S/S
= V
IN
, V
FB
= 1.5V ● 140 220 µA
Shutdown Supply Current V
S/S
= 0V 15 19 µA
V
S/S
= 0V, V
IN
= 18V, T
A
= 85°C40µA
Shutdown Threshold 0.45 1.2 V
Shutdown Delay 12 17 33 µs
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= V
DRV
= 2.5V, V
S/S
= V
IN
, COMP open, V
SENSE
= 0V unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1619E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: T
J
is calculated from the ambient temperature T
A
, the power
dissipation P
D
and the thermal resistance θ
JA
of the package according to
the formula:
T
J
= T
A
+ P
D
• θ
JA
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Bandgap Voltage vs Temperature I
S/S
vs V
S/S
S/S Pin Current vs Temperature
TEMPERATURE (°C)
–40
BANDGAP VOLTAGE (V)
1.241
1.243
80 100
1619 G01
–20 0 20 40 60 120
1.245
1.235
1.227
1.225
1.233
1.231
1.229
1.237
1.239
V
IN
= 2.5V
V
S/S
(V)
0
I
S/S
(µA)
5
4
3
2
1
0
–1
–2
–3
4.0
1619 G02
1.0 2.0 3.0 5.03.50.5 1.5 2.5 4.5
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
TEMPERATURE (°C)
–40
S/S PIN CURRENT (µA)
1
3
120
1619 G03
–1
–3
0
40
80
–20
20
60
100
5
0
2
–2
4
V
S/S
= 0V
V
S/S
= 2.5V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1619EMS8#PBF

Mfr. #:
Buy LT1619EMS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Current-Mode Boost Controller
Lifecycle:
New from this manufacturer.
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