lt3640 Linear Technology Corporation, lt3640 Datasheet
lt3640
Manufacturer Part Number
lt3640
Description
Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
Manufacturer
Linear Technology Corporation
Datasheet
1.LT3640.pdf
(24 pages)
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APPLICATIONS
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.
TYPICAL APPLICATION
V
FEATURES
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OUT1
High Voltage Buck Regulator:
4V to 36V Operating Range
1.3A Output Current
OVLO Protects Input to 55V
Low Voltage Synchronous Buck Regulator:
2.5V to 5.5V Input Voltage Range
1A Output Current
Synchronizable, Adjustable 350kHz to 2.5MHz
Switching Frequency
Programmable Power-On Reset Timer
Programmable Window Mode Watchdog Timer
Quiescent Current: 275μA
Short-Circuit Robust
Programmable Soft-Start
Low Shutdown Current: I
Available in Thermally Enhanced 28-Lead
(4mm × 5mm) QFN and 28-Lead TSSOP Packages
Industrial Power Supplies
Automotive Electronic Control Units
5V TO 34V
μP
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators
100k
V
IN
1.5nF
100k
10μF
SYNC
PGOOD
WDE
RST1
RST2
WDO
WDI
CWDT
EN/UVLO V
CPOR
32.4k
1.5nF
IN
LT3640
RT GND SS2
SW
0.22μF
BST
Q
1nF
< 1μA
SW1
SW2
V
EN2
FB1
FB2
SS1
IN2
DA
1nF
3.3μH
1μH
10μF
80.6k
49.9k
49.9k
100k
3640 TA01a
47μF
V
3.3V/0.8A
22μF
V
1.8V/0.8A
OUT1
OUT2
Reset and Watchdog Timer
90
85
80
75
70
DESCRIPTION
The LT
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
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 36V; a 38V 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
effi ciency 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 fl ags when the μP 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.
0
HV Channel Effi ciency,
Regulator with Power-On
2MHz, V
0.2
®
3640 is a dual channel, current mode monolithic
0.4
V
Electrical Specifications Subject to Change
OUT1
OUT1
0.6
CURRENT (A)
Dual Monolithic Buck
0.8
= 3.3V
V
IN
1.0
®
= 12V
to maintain high effi ciency and low
3640 TA01b
1.2
90
85
70
80
75
0
LV Channel Effi ciency,
2MHz, V
0.2
V
OUT2
0.4
CURRENT (A)
OUT2
LT3640
0.6
= 1.8V
V
IN2
0.8
= 3.3V
3640 TA01c
1
3640p
1
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