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| 型号： | LT3640IUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 5 X 4 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 1/24页 |
| 文件大小： | 506K |
| 代理商： | LT3640IUFD#TRPBF |
LT3640
3640f
Typical applicaTion
DescripTion
Dual Monolithic Buck
Regulator with Power-On
Reset and Watchdog Timer
The LT3640 is a dual channel, current mode monolithic
buck switching regulator with a power-on reset and a
watchdog timer. Both regulators are synchronized to a
single oscillator with an adjustable frequency (350kHz to
2.5MHz). At light loads, both regulators operate in low
ripple Burst Mode to maintain high efficiency and low
output ripple.
The high voltage channel is a nonsynchronous buck with
an internal 2.4A top switch that operates from an input
of 4V to 35V; a 36.5V OVLO protects the device to 55V.
The low voltage channel operates from an input of 2.5V to
5.5V. Internal synchronous power switches provide high
efficiency without the need of external Schottky diode.
Both channels have cycle-by-cycle current limit, providing
protection against shorted outputs.
The power-on reset and watchdog timeout periods are
both adjustable using external capacitors. The window
mode watchdog timer flags when the P pulses group
too close together or too far apart.
The LT3640 is available in a 28-pin 4mm
× 5mm QFN
package and 28-pin TSSOP package. Both packages have
an exposed pad for low thermal resistance.
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators
FeaTures
applicaTions
n
High Voltage Buck Regulator:
4V to 35V Operating Range
1.3A Output Current
n
OVLO Protects Input to 55V
n
Low Voltage Synchronous Buck Regulator:
2.5V to 5.5V Input Voltage Range
1.1A Output Current
n
Synchronizable, Adjustable 350kHz to 2.5MHz
Switching Frequency
n
Programmable Power-On Reset Timer
n
Programmable Window Mode Watchdog Timer
n
Typical Quiescent Current: 290A
n
Short-Circuit Robust
n
Programmable Soft-Start
n
Low Shutdown Current: IQ < 1A
n
Available in Thermally Enhanced 28-Lead
(4mm
× 5mm) QFN and 28-Lead TSSOP Packages
n
Industrial Power Supplies
n
Automotive Electronic Control Units
3640 TA01a
SYNC
PGOOD
WDE
1nF
1.5nF
32.4k
VOUT2
1.8V/0.8A
VOUT1
3.3V/0.8A
22F
10F
100k
RST2
EN2
WDO
WDI
FB2
CWDT
CPOR
RT GND SS2 SS1
RST1
SW2
SW1
EN/UVLO VIN
VIN
5V TO 35V
SW
LT3640
BST
VIN2
FB1
1H
100k
VOUT1
P
100k
49.9k
80.6k
49.9k
3.3H
0.22F
DA
22F
HV Channel Efficiency,
2MHz, VOUT1 = 3.3V
L
, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LV Channel Efficiency,
2MHz, VOUT2 = 1.8V
VOUT1 CURRENT (A)
0
70
EFFICIENCY
(%)
80
0.2
0.4
0.8
0.6
1.0
90
75
85
1.2
3640 TA01b
VIN = 12V
VOUT2 CURRENT (A)
0
70
EFFICIENCY
(%)
80
0.2
0.4
0.8
0.6
1
90
75
85
3640 TA01c
VIN2 = 3.3V
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