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PDF E910.27A Data sheet ( Hoja de datos )

Número de pieza E910.27A
Descripción External Adjustable High Efficiency PFM Step-Down Converter
Fabricantes ELMOS Semiconductor 
Logotipo ELMOS Semiconductor Logotipo



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- Preliminary -
E910.27A
External Adjustable High Efficiency PFM Step-Down Converter
Features
More than 90% efficiency and 100% duty cycle
Wide input voltage range from 5V to 40V
Integrated 1.6A on-chip P-channel MOS power switch
12µA typical shutdown current
Less than 0.5V drop voltage at 500mA output current
0.2V to Vinput adjustable output range
Controllable VOUT via an external Reference
No control loop compensation required
Improved current-limited PFM converter
Maximum operating frequency > 300kHz
Power good, reset or watchdog signal
Under-voltage lockout and thermal shutdown
-40°C to 125°C junction temperature
Available in thermally enhanced TSSOP24 package
Applications
Automotive electronics
Minimum component step-down converter
Sequenceable POL power supply systems
Externally controllable LED power supply
Externally controllable power amplifier
Brief Functional Description
The easy to use hysteretic step-down converter provides high
efficiency over a wide load and input range with few external
components.
An advanced PFM control scheme gives this device the bene-
fits of a PWM converter with high efficiency at heavy loads,
while using very low operating current at light loads to maintain
an excellent behaviour over load variation.
Maximum switching frequency of 300kHz permits small exter-
nal components and operation to 100% duty cycle allows the
lowest possible dropout voltage. For optimal flexibility an exter-
nal shunt resistor sets the maximum output current.
The converter contains a selectable internal reference with
high or low voltage to regulate a wide range of output voltage
or output current. The reference for output regulation can also
be provided from an external source, like DAC.
A selectable power good, reset or watchdog signal is provided.
An external capacitor sets the reset output pulse duration and /
or watchdog trigger time.
An optional internal short delay timeout can greatly reduce the
losses of the whole application in case of short or overload.
Very low shutdown and quiescent currents and the wide input
voltage range makes the converter ideal for battery powered
systems.
Typical Application
VINPUT
CSM
DAC
ENPS
SMON, RSEL
VSM
E91027
RFB1 RFB2
CDRV
RSIN
CDR
RS
CIN
SWD
DSW
LCK
COUT
VOUTPUT
ELMOS Semiconductor AG
Specification 1 / 50
03SP0357E.00 05.09.2006

1 page




E910.27A pdf
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2.2 Package Pinout
- Preliminary -
RSIN1
RSIN2
CDRV
VSP
VSA
ENPS
SMON
VSM
SGND
AGND
VFB
RFEX
1
2
3
4
5
6
7
8
9
10
11
12
Top View
24 SWD2
23 SWD1
22 PGND
21 GND
20 CDEL
19 PWGD
18 WEN
17 WDI
16 RSEL
15 RLEV
14 SDLY
13 ERR
Exposed Pad must be connected to GND
Figure 2.2-1: Pinout TSSOP24 ADT-1
E910.27A
ELMOS Semiconductor AG
Specification 5 / 50
03SP0357E.00 05.09.2006

5 Page





E910.27A arduino
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- Preliminary -
5.4 MUX
No. Parameter
Condition
Symbol
Min.
1 RFEX input voltage range 1)
VRFEX
0
2 RFEX input current
1)
0V < VRFEX < 1.3V
IRFEX
-
3 RFEX feedthrough loss
1) 2) Source Impedance
< 2kOhm
VLRFEX
-
4 RSEL level true
1) 2)
VRSELH
-
5 RSEL level false
1) 2)
VRSELL
-
6 RSEL input current
1)
IRSEL
-
7 RLEV level true
1) 2)
VRLEVH
-
8 RLEV level false
1) 2)
VRLEVL
-
9 RLEV input current
1)
IRLEV
-
1) VS => 5V, VSM > 4V, ENPS = true, SMON = true, 2) Ensured by design. Not production tested.
Typ.
-
-1
10
0.65xVSM
0.26xVSM
1
0.65xVSM
0.26xVSM
1
E910.27A
Max. Unit
1.30 V
-3 µA
- mV
-V
-V
- µA
-V
-V
- µA
5.5 Voltage Comparator
No. Parameter
Condition
Symbol
Min.
1 Effective VFB offset voltage 1) 2)
VOFF
-10
2 VFB input current
1)
IVFB -
3 VFB reference voltage H 1)
VR1 1.165
4 VFB reference voltage L 1)
VR2 194
5 Static VFB hysteresis
1)
VCMPHYST
6
VFB propagation time to SW
output
2) VS=12V,
VR1+/-100mV
Tj=25°C, RSW=50Ohm
TRHFB
-
1) VS => 5V, VSM > 4V, ENPS = true, SMON = true, 2) Ensured by design. Not production tested.
Typ.
0
-1
1.200
200
4
100
Max.
10
-3
1.236
206
-
Unit
mV
µA
V
mV
mV
ns
5.6 Current Comparator
No. Parameter
Condition
Symbol
Min.
1 Threshold level
1)
VCLIM
VS-170m
2
Propagation time to SWD
output
2) VS=12V, Tj=25°C,
RS=1.30Ohm,
RSW=50Ohm
TRHCL
-
1) VS => 5V, VSM > 4V, ENPS = true, SMON = true, 2) Ensured by design. Not production tested.
Typ.
VS-200m
100
Max.
VS-230m
-
Unit
V
ns
ELMOS Semiconductor AG
Specification 11 / 50
03SP0357E.00 05.09.2006

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