IXD3237C18DER-G datasheet, PDF

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IXD3237C18DER-G: DescriptionSwitching Regulator; CategoryPower/power management The power supply circuit; File Size1MB，27 Pages; ManufacturerIXYS

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IXD3237C18DER-G Overview

Switching Regulator

IXD3237C18DER-G Parametric

Parameter Name	Attribute value
Maker	IXYS
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR

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IXD3235/36/37

Step-

Converter

Synchronous 600 mA Step-Down DC/DC Converter

FEATURES

Built-in transistors

Operating Input Voltage Range:

2.0 V ~ 6.0 V

(A/B/C types) or 1.8 V ~ 6.0 V (D/E/F/G types)

Output Voltage Range Externally Set:

0.8 V ~ 4.0 V

(internally set) or 0.9 ~ 6.0 V (externally set)

Output Current:

600 mA

High Efficiency:

92%

Oscillation Frequency:

1.2 MHz, 3 MHz

Maximum Duty Cycle:

100%

Operating Modes:

PWM, PWM/PFM auto select or

PWM/PFM manual select

Functions:

Build-in Current Limit, Load Capacitor

Discharge, High Speed Soft start

Operating Ambient temperature:

-40 ~ +85 C

Packages:

SOT-25, USP-6C, USP-6EL, WLP-5-03

EU RoHS Compliant, Pb Free

APPLICATION

Mobile Phones

Bluetooth headsets

Digital home appliances

Office automation equipment

Various portable equipment

DESCRIPTION

The IXD3235/36/37 series is a group of synchronous-

rectification type DC/DC converters with a built-in

0.52

Ω

N-channel synchronous rectification transistor

and 0.42

Ω

P-channel switching transistor providing

up to 600 mA output current.

Operating voltage range is from 2.0 V to 6.0 V (A

C types) or 1.8 V to 6.0 V (D

G types). For the D/F

types, which have a reference voltage of 0.8 V with ±

2.0% accuracy, the output voltage can be set from

0.9 V by using two external resistors.

The A/B/C/E/G types have a fixed output voltage

from 0.8 V to 4.0 V in increments of 0.05 V with

± 2.0% accuracy. The device requires only an

inductor and two externally connected ceramic

capacitors. The built-in oscillator, either 1.2 MHz or

3.0 MHz, can be selected.

The IXD3235 operates in PWM mode, the IXD3236

automatically switches between PWM/PFM modes,

and the IXD3237 allows switch manually between the

PWM and the automatic PWM/PFM switching control

modes. This allows fast response, low ripple, and

high efficiency over the full range of loads from light

to heavy.

The soft start and current control functions are

internally optimized. All circuits are disabled in a

standby mode to reduce current consumption to less

than 1.0

µA.

The B/F/G types have a 0.25 ms high-speed soft-

start for quick turn-on. The built-in Under Voltage

Lockout (UVLO) function forces the internal

P-channel transistor OFF, when input voltage

becomes 1.4 V or lower.

The B to G types have the output capacitor C

discharge circuitry, which allows fast C

discharge

when IC goes into standby mode.

Device is available in four types of packages: SOT-

25, USP-6C, USP-6EL, and WLP-5-03.

TYPICAL APPLICATION CIRCUITS

TYPICAL PERFORMANCE CHARACTERISTIC

Efficiency vs. Output Current (f

OSC

= 1.2 MHz, V

OUT

= 1.8 V)

PWM/PFM Automatic Switching mode

IXD3235/36/37 A, B, C, E, and G types

IXD3235/36/37 D and F types

Characteristics subject to change without notice

Doc. No. IXD3235_DS, Rev. N0

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