Matrix MT5201 Schematics
1A, PWM Step-Down DC/DC Converter
MT5201
DESCRIPTION
The MT5201 is a step-down, current mode, DC-DC converter. At heavy load, the constant-frequency PWM control
performs excellent stability and transient response. To ensure the longest battery life in portable applications, the
MT5201 have a power-saving Pulse-skipping Modulation (PSM) mode and reduce the quiescent current under light
load operation to save power.
The MT5201 is supported with a range of input voltages form 2.5V to 5.5V allowing the use of a single
Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB, and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage, while the suffix part numbers MT5201-X.X indicate pre-set voltage ranges of
3.3V, 1.8V, 1.5V or 1.2V. All versions Include internal power switch and synchronous rectifier for minimal external part
count and high efficiency. During the shutdown, the input is disconnected form the output and the shutdown current is
less than 0.1uA. Other key features include under-voltage lockout to prevent deep-battery discharge.
FEATURES
¾ Efficiency up to 96%
APPLICATIONS
¾ Cellular phone
¾ Only 40uA(TYP.) Quiescent Current
¾ Up to 1A
¾ Internal Synchronous Rectifier
¾ 1.5MHz Switching Frequency
¾ Under-Voltage Lockout
¾ Short Circuit Protection
¾ 5-pin Small SOT-23-5 Package
¾ Pb-Free Package
PIN CONFIGURATIONS
SOT-23-5 (Top View)
¾ Portable electronics
¾ Wireless Devices
¾ Cordless phone
¾ Computer peripherals
¾ Battery Powered Widgets
¾ Electronic scales
MT5201-X.XN
- 1 - www.matrix-microtech.com.tw.
1A, PWM Step-Down DC/DC Converter
PIN CONFIGURATION
Pin Number Name Function
1 EN Enable(active high)
2 GND Ground
3 SW Switch
4 VIN Input
5 VOUT/FB Output/Feedback
ORDERING INFORMATION
MT5201
Device Package
V
Volts
OUT
TA (OC)
MT5201-X.XN N SOT-23-5L X.X_ 3.3/ 1.8/ 1.5/ 1.2/ ADJ 0-85
POWER DISSIPATION TABLE
θ
Package
JA
(OC /W )
Power rating(mW)
N 250 400 220 160
≤ 25 OC
T
A
TA=70 OC
Power rating(mW)
TA= 85 OC
Power rating (mW)
Note :
1. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into
thermal shutdown.
J: Junction Temperature Calculation:
2. T
= TA + (PD × θJA)
T
J
numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no
The θ
JA
ambient airflow.
3. θ
Thermal Resistance-Junction to Ambient.
JA:
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Maximum Unit
Input Voltage VIN 6.6 V
EN, FB Pin Voltage VEN
SW Pin Voltage V
SW
-0.3 to V
-0.3 to (VIN +0.3) V
V
IN
Junction Temperature TJ 125 OC
Storage Temperature Range T
Soldering Temperature Range T
Note :
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time
periods may affect device reliability. All voltages are with respect to ground.
- 65 to 150
STG
300/5sec OC
OPR
O
C
- 2 - www.matrix-microtech.com.tw.
RECOMMENDED OPERATING CONDITIONS
MT5201
1A, PWM Step-Down DC/DC Converter
Parameter
Supply Voltage
Supply Voltage( for Max.duration of 30 Min.)
Operating Temperature
BLOCK DIAGRAM
Symbol Max Unit
5.5
6.0
85
V
V
O
C
T
V
V
CC
CC
OPR
- 3 - www.matrix-microtech.com.tw.
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