The JTMA7138 is a single-phase, constant-on-time, and synchr

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 JTMA7138 is a single-phase, constant-on-time, and synchronous
PWM controller which drives N-channel MOSFETs. The JTMA7138 steps
down high voltage of a battery to generate low-voltage chipset or RAM supplies
in notebook computers.
The JTMA7138 provides excellent transient response and accurate DC
voltage output in either PFM or PWM Mode.In Pulse Frequency Modulation
(PFM) Mode, the JTMA7138 provides very high efficiency over light load
with loading-modulated switching frequencies. When the inductor current
is continuous, the operation automatically enters PWM mode with relatively
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,
the Forced-PWM Mode works nearly at constant frequency for low-noise
requirements.
The JTMA7138 is equipped with accurate over-current,output under-
voltage, and over-voltage protections per-fect for NB application. A Power-
On-Reset function moni-tors the voltage on VCC pin to prevent errorneous
opera-tion during power-on. The JTMA7138 has a digital soft-start and soft-stop.
The internal integrated soft-start ramps up the output voltage with controlled slew
rate to reduce the start-up current. The digital soft-stop function actively discharges
the output capacitors with controlled reverse inductor current.
The JTMA7138 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packages

二.产品特点(Features)
1.)Adjustable Output Voltage from +0.6V to +3.3V
- 0.6V Reference Voltage
- ±1% Accuracy Over Temperature
2.)Operates from an Input Battery Voltage Range of +3V to +25V
3.)Wide Output Load Range from 0A to 25A
4.)Power-On-Reset Monitoring on VCC Pin
5.)Excellent Line and Load Transient Response
6.)PFM Mode for Increased Light Load Efficiency
7.)Programmable PWM Frequency from 200kHz to 600kHz
8.)Integrated MOSFET Drivers and Bootstrap Diode
9.)Internal Integrated Soft-Start and Soft-Stop
10.)Selectable Forced PWM or Automatic PFM/PWM
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)
Power Good Monitoring
12.)Fault Identification by PGOOD Pull-Down Resistance
13.)70% Under-Voltage Protection (UVP)
14.)124% Over-Voltage Protection (OVP)
15.)Adjustable Over-Current Protection (OCP)
- Sensing Low-Side MOSFET’s Current
16.)Over-Temperature Protection (OTP)
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-
16A), and TQFN3x3-16 Packages
18.)Lead Free and Green Devices Available

三,应用范围 (Applications)
PCI Express Graphical Processing Unit
Notebook Adapter
Auxiliary Power Rail
VRM

四.下载产品资料PDF文档

JTMA7138

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