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PE2118 Schematic ( PDF Datasheet ) - Zetex

Teilenummer PE2118
Beschreibung Synchronous Boost DC/DC Regulator
Hersteller Zetex
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Gesamt 9 Seiten
PE2118 Datasheet, Funktion
PE2118
Synchronous Boost DC/DC Regulator PE2118
Features
Description
Up to 96% Efficiency
Low voltage start-up 0.9V
Shut-down current: < 1 A
Input voltage 0.6V 4.4V
Output voltage 2.5V 4.3V (Up to 5V
with Schottky)
Low switch on resistance RDS(ON),
Internal switch: 0.35
1.4MHz fixed frequency switching
High switch on current: 1A
Short-Circuit protection
Low profile SOT-23-6 package (lead-free
packaging is now available)
Applications
Digital cameras and MP3
Palmtop computers / PDAs
Cellular phones
Wireless handsets and DSL modems
PC cards
Portable media players
The PE2118 is high efficiency synchronous,
PWM step-up DC/DC converters optimized
to provide a high efficient solution to
medium power systems. The devices work
under the input voltage between 0.6V and
4.4V with a 1.4MHz fixed frequency
switching. These features minimize overall
solution footprint by allowing the use of tiny,
low profile inductors and ceramic
capacitors.
The PE2118 is capable of supplying an
output voltage between 2.5V and 4.3V, the
internal synchronous switch is desired to
provide high efficiency without Schottky.
The devices also featured providing up to
260mA from a single AA cell input or up to
600mA from a 2-cell AA with a 3V/3.3V
output.
The PE2118 regulators are available in the
industry standard SOT-23-6 power packages
(or upon request).
Order Information
PE2118
:
SYMBOL
DESCRIPTION
Denotes Output voltage:
A : Adjustable Output
Denotes Package Types:
F: SOT-23-6
-1-
Free Datasheet http://www.datasheet4u.com/






PE2118 Datasheet, Funktion
PE2118
Application Information
PIN ASSIGNMENT
SW (Pin 1): Switch Pin. Connect inductor between SW and VIN. Keep these PCB trace lengths
as short and wide as possible to reduce EMI and voltage overshoot.
GND (Pin 2): Signal and Power Ground. Provide a short direct PCB path between GND and the
(–) side of the output capacitor(s).
FB (Pin 3): Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The
output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.203V • [1 + (R1/R2)].
EN (Pin 4): Logic Controlled Shutdown Input. EN = High: Normal free running operation,
1.5MHz typical operating frequency. EN = Low: Shutdown, quiescent current <1µA. Output
capacitor can be completely discharged through the load or feedback resistors.
VOUT (Pin 5): Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier
MOSFET. Bias is derived from VOUT. PCB trace length from VOUT to the output filter capacitor(s)
should be as short and wide as possible.
VIN (Pin 6): Battery Input Voltage. The device gets its start-up bias from VIN. Once VOUT exceeds
VIN, bias comes from VOUT. Thus, once started, operation is completely independent from VIN.
Operation is only limited by the output power level and the battery’s internal series resistance.
-6-
Free Datasheet http://www.datasheet4u.com/

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