datasheet e910_27_neu - Elmos Semiconductor AG

INTRODUCTION
BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
DRIVER IC
I/O IC
SENSOR INTERFACE IC
SENSOR IC
IP’S
E 910.22 Wide range flyb. SMPS with WD
E 910.24 | 25 | 26 PFM controller family
ÿ E 910.27 Step down converter, fully integr.
E 981.03 Energy storage controller
E 910.28 Step down converter, for ext. FET
ÿ Step down converter, fully integrated
FEATURES
E910.27
APPLICATION
ÿ
Wide input range of 5V to 40V
ÿ
Automotive electronics
ÿ
Wide, adjustable output voltage of 1.25V
ÿ
Controller and sensor supply
to (VIN-0.5V)
ÿ
LED supply
ÿ
Output current range of 0mA to 2.8 A peak
ÿ
General supply applications
ÿ
Fully integrated,
ÿ
ÿ
ÿ
minimum external components required
DESCRIPTION
Very high efficiency over the whole load
The IC is developed and optimized for automotive applications
current range (up to 90%)
where it can be used to supply controllers, sensors, power-
Very low shutdown current with internal supply off
LEDs and many other devices. The reference input allows it to
(12 µA typical)
control the output voltage (or current) with e.g. an external DAC.
Low standby current with internal supply on for fast
That makes it easy to build LED-dimmer or any application that
start up (<200µA typical)
needs variable supply.
ÿ
100% duty cycle possible
ÿ
Easy to use chaotic regulation behaviour
For fast load and line regulation a multi-loop regulation is imple-
ÿ
Fast multi-loop-regulation
mented using a chaotic current mode regulator which re-quires
ÿ
Adaptive frequency selection up to 300kHz
no compensation components.
ÿ
No compensation necessary
ÿ
Reference voltage input available, for e.g.
The possibility to generate a duty cycle of 100% enables the mini-
DAC control of Vout
mum possible voltage drop and therefore the best utilization of
ON and sleep control-input with TTL threshold but
components and input voltage range. With the ENPS and SMON
accepting up to 40V
pins the converter can be started and stopped. Due to their wide
ÿ
Open load stable
input voltage range the pins can be driven by TTL- and CMOS-
ÿ
Temperature range – 40°C to + 125°C.
level as well as CAN-controller output or a (filtered) Kl15 signal.
ÿ
TSSOP24 package
ÿ
PINNING
PACKAGE
Pin
Name
Description
1
RSIN1
PFM current sense comparator input
2
RSIN2
PFM current sense comparator input
3
CDRV
High side linear regulator output
4
VSP
Positive power stage supply input
5
VSA
Positive analog power supply input
6
ENPS
Shutdown input
7
SMON
SMON control input, Active-high
8
VSM
Internal linear regulator output
9
SGND
Signal ground
10
AGND
Analog ground
11
VFB
Feedback input
12
RFEX
External reference input
13
ERR
Error output
14
SDLY
Delayed restart PFM after fault, high active
15
RLEV
Internal high-reference low-active
16
RSEL
Reference select, low=internal, high=external
17
WDI
Watchdog trigger input
18
WEN
Watchdog enable input
19
PWGD
Power good, Open drain output
20
CDLY
Delay timing capacitor input
21
GND
Ground
22
PGND
Power ground
23
SWD1
Drain output of the internal power P-MOSFET
24
SWD2
Drain output of the internal power P-MOSFET
TSSOP 24
BLOCK DIAGRAM
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.
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Copyright © 2007 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.
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