ßßDRIVENßBY - Elmos Semiconductor AG

ßßDRIVENßBY
E910.27
Step down converter, fully integrated
Features
Applications
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Wide input voltage range of 5V to 40V
Wide, adjustable output voltage of 0.25V
to (VIN-0.5V)
Output current range up to 2.8A
Fully integrated,
minimum external components required
Very high efficiency in the entire load
current range (up to 90%)
Very low shutdown current (12µA typical)
Fast start up
100% duty cycle possible
Fast multi-loop-regulation
Adaptive switching frequency up to >300kHz
No compensation necessary
External reference voltage input, for e.g.
DAC control of Vout
ON and sleep control input with TTL threshold but
accepting up to 40V
Open load stable
Ambient temperature range – 40°C to + 125°C.
TSSOP24 package
Automotive electronics
Controller and sensor supply
LED supply
General supply applications
General Description
The IC is developed and optimized for automotive applications where it can be used to supply controllers,
sensors, high power LEDs and many other devices. The
reference input allows to control the output voltage (or
current) with e.g. an external DAC. That makes it easy to
build an LED dimmer or any application that needs variable supply. For fast load and line regulation a multiloop regulation is implemented using a chaotic current
mode regulator which requires no compensation. The
possibility of a 100% duty cycle enables the minimum
possible voltage drop and therefore the best utilization
of components and input voltage range. With the ENPS
and SMON control inputs the converter can be enabled
and set to standby/operation mode. Due to their wide
input voltage range these inputs can be driven with TTL
or CMOS level as well as CAN controller output or a (filtered) Kl15 signal.
VBAT
VSA
VSP
CDRV
SMON
int.
Supply
ENPS
VSM
VLIM
+
RSIN1
-
RSIN2
0,2 V
MUX
1,22 V
RFEX
VCC (Standby)
RES
External
µC
DO 0
DO 1
+
VCMP
-
PWM
GEN
DRV
SWD1
RSEL
RLEV
PWGD
WDI
WEN
VOUT
SWD2
VDRV
PowerGood
&
WD
CDLY
DI 0
OVTMP
Err Proc
PGND
UVLO
E910.27
VFB
ERR
SDLY
GND
SGND
GND
AGND
VCC
ELMOS Semiconductor AG
Info Sheet
QM-No.: 25IS0021E.00 2009-09-30
ELMOS Semiconductor AG – Headquarters
Heinrich-Hertz-Str. 1 | 44227 Dortmund | Germany
Phone + 49 (0) 231 - 75 49 - 100 | Fax + 49 (0) 231 - 75 49 - 149
[email protected] | www.elmos.de
Note ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any
circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication
has been checked, no responsibility, however, is assumed for inaccuracies. ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of
the product can reasonably be expected to cause failure of a life-support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications.
Copyright © 2009 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.