The JTMA7277 is a synchronous rectifier, fixed switching fre

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

一,产品概述(General Description)
The JTMA7277 is a synchronous rectifier, fixed switching frequency (1.2MHz typical), and
current-mode step-up regulator. The device allows use of small inductors and output capacitors for USB devices. The current-mode control scheme provides fast transient response and good output voltage accuracy.At light loads, the JTMA7277 will automatically enter in Pulse Frequency Modulation (PFM) operation to reduce the dominant switching losses. During PFM operation,the IC consumes very low quiescent current and maintains high efficiency over the complete load range.
The JTMA7277 also includes current-limit and over-temperature shutdown to prevent damage
in the event of an output overload.
The JTMA7277 is available in 4mmx4mm TQFN4x4-16 and DFN3x3-12 packages.
二.产品特点(Features)
1.)92% Effiicency Synchronous Boost Converter With 1000-mA Output Current From
1.8V Input
2.)Stable with Low ESR Output Capacitors
3.)Fixed 1.2MHz Oscillator Frequency
4.)Low EMI Converter (Integrated Anti-Ringing Function)
5.)Low Battery Output
6.)Integrated Power Save Mode Operation to Improve Light Load Efficiency
7.)Load Disconnected During Shutdown
8.)Output Current-Limit Protection
9.)Over Temperature Protection
10.)Under Voltage Protection
11.)Enable/Shutdown Function
12.)Available in TQFN4x4-16 and DFN3x3-12 Packages
13.)Lead Free and Green Devices Available (RoHS Compliant)
三,应用范围 (Applications)
Power Bank
Tablet
Portable Equiment

四.下载产品资料PDF文档

JTMA7277

五,产品封装图 (Package)

PIN	NAME	FUNCTION
1,15,16	VOUT	Converter Output and IC Supply Voltage.
2	NC	Enable in Charge Done No Internal Connection.
3,4	SW	Converter Switch Pin. Connect inductor here.
5,6,7	PGND	Enable in Charge Done Power Ground. Connect these pins to GND.
8	VBAT	Converter Supply Voltage. Enable in Charge Done
9	LBI	Low Battery Indicator.
10	PSI	Power Saving Input. Force VPSI exceed 1V enter PFM. Left VPSI below 0.4V enter PWM mode.
11	EN	Device Enable Control Input. Force VEN exceed 1V enable the device. Left VEN below 0.4V to shutdown.
12	LBO	Low Battery Output.
13	GND	Signal Ground. Connect this pin to PGND.
14	FB	Converter Feedback Input.
Exposed Pad	PGND	Power Ground. Tie this pin to the ground island/plane through the lowest impedance connection available.

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