The JTM3420,JTM3420B,JTM3420D,JTM3420S is a 1.5MHz constant

1.产品概述         2.产品特点
3.应用范围    4.产品封装图
5.电路原理图              6.产品PDF文档
7.功能概述       8.相关产品

一,产品概述(General Description)
The JTM3420D is a 1.5MHz constant frequency,current mode step-down converter. It is ideal for portable equipment requiring very high current up
to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The JTM3420D also can run at 100%
duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The JTM3420D can supply up to 2A output load current from a 2.3V to 6V input
voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate
with smaller inductor values to optimize size and provide efficient operation. The device is available in a Pb-free, 3x3mm 10-lead DFN package and is rated over the -40°C to +85°C temperature range.This device offers two operation modes, PWM
control and PFM Mode switching control, which allows a high efficiency over the wider range of the load.

二.产品特点(Features)

High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
2A Output Current
No Schottky Diode Required
2.3V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
PFM Mode for High Efficiency in Light Load
100% Duty Cycle in Dropout Operation
Low Quiescent Current: 40μA
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1μA Shutdown Current
DFN3X3-10 package
三,应用范围 (Applications)

Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Portable Instruments
Digital Still and Video Cameras
PC Cards

四,产品封装图 (Package)

五,电路原理图

Pin Name	Pin Number	Description
EN	1	Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN below 0.3V to turn it off. Do not leave EN floating.
VDD	2	Analog supply input pin.
PVDD	3	Power Supply Input. Must be closely decoupled to GND with a 10μF or greater ceramic capacitor.
GND	4,6	Analog ground pin.
FB	5	Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage.
SW	7,8	Power Switch Output. It is the switch node connection to Inductor. This pin connects to the drains of the internal P-ch and N-ch MOSFET switches.
PGND	9,10	Power Ground Pin.
EP	11	Power Ground exposed pad, Must be connected to bare copper ground plane.

六.产品PDF文档

JTM3420

JTM3420S

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