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ELM621LA Schematic ( PDF Datasheet ) - ELM Technology

Teilenummer ELM621LA
Beschreibung High efficiency 30V step up DC/DC converter
Hersteller ELM Technology
Logo ELM Technology Logo 




Gesamt 9 Seiten
ELM621LA Datasheet, Funktion
ELM621LA High efficiency 30V step up DC/DC converter
General description
ELM621LA is a high efficiency step-up DC/DC converter using a constant frequency, current mode
architecture. Featuring current-mode and fixed frequency operation, this device incorporates an integrated
main switch and the switching frequency is internally set at 1.3MHz, allowing the use of small surface mount
inductors and capacitor. As for the output voltage, it can be regulated ranging from 2.7V to 30V.
ELM621LA is available in a low profile TSOT-25 package.
■Features
• Current mode operation
• Thermal shutdown protection
• Undervoltage-lockout (UVLO)
• Input voltage range
• Internal current limit
• Shutdown current
• Constant frequency operation
• High efficiency
• Package
: 2.5V to 5.5V
: 1.45A
: < 0.1µA
: Typ.1.3MHz
: 90%
: TSOT-25
■Application
• Cellular telephones
• PDAs and smart phones
• MP3 players
• Wireless and DSL card
• Digital still cameras
• Slim-type DVD
• Portable instruments
■Maximum absolute ratings
Parameter
Symbol
Limit
VIN power supply voltage
Vin
GND-0.3 to +6.5
Apply voltage to EN
Ven GND-0.3 to +6.5
Apply voltage to FB
Vfb GND-0.3 to +6.5
Apply voltage to SW
Vsw GND-0.3 to +43
SW peak current
Isw 2
Power dissipation
Pd 200
Operating temperature range
Top
-20 to +85
Storage temperature range
Tstg
-65 to +150
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
Unit
V
V
V
V
A
mW
°C
°C
■Selection guide
ELM621LA-S
Symbol
a Package
b Product version
c Taping direction
* Taping direction is one way.
L: TSOT-25
A
S: Refer to PKG file
ELM621LA - S
↑↑ ↑
ab c
9- 1
Rev.1.2






ELM621LA Datasheet, Funktion
ELM621LA High efficiency 30V step up DC/DC converter
■AP circuit1 12V Step up converter
Vin 2.5V~5.5V to Vout 12V
Vin Vin=2.5~5.5V
Vout<30V
12V
Vout
C3
10µF
D B340
R1 115K
L
4.7µH
C2
4.7µF
U2
C1
0.1µF
1 SW
2 GND
3 FB
VIN 5
EN 4
ELM621LA
R2 Vref=1.25V
13.3K
R3 100K
C4
0.1µF
Enable
■AP circuit2 SEPIC Converter(Step up/Step down)
Step up/Step down converter is realized by ELM621LA and SEPIC topology. Vin2.5V~4.2V to Vout 3.3V.
3.3V
150mA
Vout
C3
10µF
D B340 C6
1µF
L2 10µH
R1 1M
Vin Vin=2.5~4.2V
L1
10µH
C2
4.7µF
C1
0.1µF
U2
1 SW
2 GND
3 FB
VIN 5
EN 4
R2
604K
ELM621LA
Vref=1.25V
R3 100K Enable
C4
0.1µF
9- 6
Rev.1.2

6 Page







SeitenGesamt 9 Seiten
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