The JTMA8981 series is a 3A ultra low dropout linear regula

1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（产品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 JTMA8981 series is a 3A ultra low dropout linear regulator. This product is specifically
designed to provide well supply voltage for front-side-bus termination on motherboards and
NB applications. The IC needs two supply voltages, a control voltage for the circuitry and a
main supply voltage for power conversion, to reduce power dissipation and provide extremely
low dropout. The
JTMA8981 series integrates many functions. A Power-On-Reset (POR) circuit monitors both
supply voltages to prevent wrong operations. A thermal shutdown and current limit functions
protect the device against thermal and current over-loads. A POK indicates the output status with
time delay which is set internally. It can control other converter for power sequence.
The JTMA8981 series can be enabled by other power system. Pulling and holding the EN pin
below 0.4V shuts off the output.
The JTMA8981 series is available in DFN 3x3-10L & ESOP-8 package which features small size
as SO-8 and anExposed Pad to reduce the junction-to-case resistance.
二.产品特点(Features)

Ultra Low Dropout 0.21V(typical) @ 2A Output
Current for 1.2V Output Voltage
Low ESR Output Capacitor (Multi-layer Chip
Capacitors (MLCC)) Applicable
EN Pull-low for JTMA8981MP-A
EN Pull-high for JTMA8981MP-B
Fast Transient Response
Adjustable Output Voltage by External Resistors
Power-On-Reset Monitoring on Both VCNTL
and VIN Pins
Internal Soft-Start
Current-Limit and Thermal Shutdown Protection
Power-OK Output with a Delay Time
SO-8 with Exposed Pad Pb-Free &
DFN 3x3-10L Package.
Halogen Free Product
三,应用范围 (Applications)

四.技术规格书下载（产品PDF）

JTMA8981

五,产品封装图 (Package)

六.电路原理图

七,功能概述

CNTL Supply Voltage (VCNTL) --------------------------- -0.3V To 6.5V
Input Supply Voltage (VIN) ------------------------------- -0.3V To 6.5V
EN & FB Pin Voltage (VEN/VFB) ------------------------- -0.3V To VCNTL+0.3V
Power Good Voltage (VPOK) ---------------------------- -0.3V To 6.5V
Power Dissipation (PD) ---------------------------------- 2.5W
Storage Temperature Range (TST) -------------------- -65°C To 150°C
Junction Temperature Range (TJ) --------------------- -40°C To 150°C
Thermal Resistance Junction to Ambient (Rth ja)Note
ESOP-8 ------- 40°C/W

DFN 3x3-10L -----62.5°C/W

Thermal Resistance Junction to Case (Rth jc) Note

ESOP-8 ------- 15°C/W
DFN 3x3-10L 17°C/W
八,相关芯片选择指南

Part Number	Package	Vin (max)	Vout	Max. Current (A)	Current Limit (A)	Quiescent Current Typ. (uA)
JTMA8862U5	SC-70-5L	6	3.3V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	600	30
JTMA8862Y5	SOT-23-5L	6	3.3V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	600	30
JTMA8862K	SOT-223	6	3.3V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	600	30
JTMA8862G	SOT-89	6	3.3V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	600	30
JTMA8862H	TO-252	6	3.3V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	600	30
JTMA1205Y5	SOT-23-5L	10	ADJ,3.6V,3.3V,3.0V,2.8V,2.5V,1.8V	0.3	0.42	5
JTMA1209M	SO-8	10	ADJ	1	1.4
JTMA8800A-XXY5P	SOT-23-5L	6	5.0,3.6V,3.3V,3.1V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V	0.3	0.3	30
JTMA8800A-XXTY5P	TSOT-23-5L	6	5.0,3.6V,3.3V,3.1V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V	0.3	0.3	30
JTMA8800N	SOT-23	6	3.6V,3.3V,3.0V,2.8V,2.5V,1.8V,1.5V	0.3	0.3	30
JTMA8800G	SOT-89	6	3.6V,3.3V,3.0V,2.8V,2.5V,1.8V,1.5V	0.3	0.3	30
JTMA8805K	SOT-223	6	3.3V,3.0V,2.8V,2.5V,2.0V,1.8V,1.5V	0.6	0.6	30
JTMA8805G	SOT-89	6	3.3V,3.0V,2.8V,2.5V,2.0V,1.8V,1.5V	0.6	0.6	30
JTMA8805N	SOT-23	6	3.3V,3.0V,2.8V,2.5V,2.0V,1.8V,1.5V	0.6	0.6	30
APU8836Y5	SOT-23-5L	10	ADJ	0.3	0.32	5
APU8850Y5	SOT-23-5L	27	ADJ,5.0V,3.3V,3.0V,2.8V,2.5V,1.8V	0.15	0.2	250
APU8850G	SOT-89	27	ADJ,5.0V,3.3V,3.0V,2.8V,2.5V,1.8V	0.15	0.2	250
APU8850MP	ESOP-8	27	ADJ,5.0V,3.3V,3.0V,2.8V,2.5V,1.8V	0.15	0.2	250
APU8850TY5	TSOT-23-5L	27	ADJ,5.0V,3.3V,3.0V,2.8V,2.5V,1.8V	0.15	0.2	250
APU8850U	J-Lead 2021-8	27	ADJ,5.0V,3.3V,3.0V,2.8V,2.5V,1.8V	0.15	0.2	250
JTMA8862Y5	SOT-23-5L	6	3.3V,3.1V,3.0V,2.8V,2.5V,1.8V,1.5V,1.2V,1.0V	0.6	0.6	55
JTMA8865N	SOT-23	6	3.3V~1.5V,1.2V (0.1V Steps)	0.3	0.3	30
JTMA8865Y5	SOT-23-5L	6	3.3V~1.5V,1.2V (0.1V Steps)	0.3	0.3	30
JTMA8865U4	SC-70-4L	6	3.3V~1.5V,1.2V (0.1V Steps)	0.3	0.3	30
JTMA8865U5	SC-70-5L	6	3.3V~1.5V,1.2V (0.1V Steps)	0.3	0.3	30
JTMA8865TY5	TSOT-23-5L	6	3.3V~1.5V,1.2V (0.1V Steps)	0.3	0.3	30
JTMA8866Y5	SOT-23-5L	6	ADJ	0.6	0.6	40
JTMA8866U5	SC-70-5L	6	ADJ	0.6	0.6	40
JTMA8866M	SO-8	6	ADJ	0.6	0.6	40
JTMA8867Y5	SOT-23-5L	6	ADJ	0.3	0.3	40
JTMA8981GN3-A	DFN-3x3-10L	5.5	ADJ	3	3.1

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