Step-up DC/DC Controller

EC9215

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5J15N-Rev.F001

General Description

The EC9215 is a single PWM, step‐ up DC‐ DC controller

with low operating voltage application integrating softstart and

short circuit detection function. The oscillator switching

frequency on chip can be operated by terminating OSC pin to

connect capacitor and resistor for adjustable operating

frequency. Soft‐ start is adjusted with the external capacitor,

which sets the input current ramp. Besides, the external

compensation FB pin will apply the flexibility in the dynamic

loop status, which allows using small and low equivalent

series resistance (ESR) ceramic output capacitors.

The EC9215 is available in a Pb‐ free, SOP‐ 8L and

TSSOP-8L package.

Features

●2.5 to 5.5V Input Voltage Range

●Adjustable Frequency: Maximum 1MHZ

●Incorporates Soft‐ Start Function

●Built‐ in Short‐ Circuit Detection Circuit (SCP)

●Low Operating Current: Maximum to 1mA

●Low Shutdown Current: Maximum to 1µA

●Under‐ Voltage Lockout

●Package: SOP‐ 8 and TSSOP‐ 8

●Lead Free and Green Devices Available (RoHS

Compliant)

Applications

●LCD Display Power Source

●PDA, PMP, MP3

●Digital Camera

Pin Assignments

Figure1 Pin Configuration of EC9215(Top View)

Pin Description

Pin Number

Pin Name

Description

1

INV

Internal 0.5V reference voltage. Use a resistor divider to set the output voltage

2

SCP

Soft‐ start and short‐ circuit detection, connects a capacitor from the pin to ground.

3

VDD

Power supply input pin for IC voltage

4

CTL

Output control pin. Low = operating mode; High = shutdown mode.

5

OUT

External MOSFET driving pin.

6

GND

GND

7

OSC

Setting capacitor and resister to provide oscillation switching frequency adjustment.

8

FB

Error amplifier output pin. Setting circuit for IC compensation.