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PDF MT5032 Data sheet ( Hoja de datos )
| Número de pieza | MT5032 | |
| Descripción | 800kHz Synchronous Step-up Converter | |
| Fabricantes | M3TEK | |
| Logotipo |  |
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M3TEK
Preliminary Datasheet
MT5032
800kHz Synchronous Step-up Converter with 5.5A Switches
DESCRIPTION
The MT5032 devices provide a power supply
solution for products powered by either a one-cell
Li-Ion or Li-polymer battery. The converter
generates a stable output voltage that is either
adjusted by an external resistor divider or fixed
internally on the chip. It provides high efficient
power conversion and is capable of delivering
output currents up to 2.1A at 5.3V at a supply
voltage down to 2.9V. The maximum peak current
in the step-up switch is limited to a value of 5.5A.
The MT5032 operates at 800kHz switching
frequency and enters pulse-skip-mode (PSM)
operation at light load currents to maintain high
efficiency over the entire load current range.
During shutdown, the load is completely
disconnected from the battery.
FEATURES
Synchronous Step-up Converter with 2.1A
Output Current From 2.9V Input
Wide VIN Range From 2.9V to 5.5V
Input Under-voltage Lockout Protection
Fixed and Adjustable Output Voltage
Built-in Output Over-voltage Protection
Light-Load Pulse Skip Mode
Load Disconnect During Shutdown
Output Short Circuit Protection
Thermal Shutdown Protection
Available in a SOP8_EP Packages
APPLICATIONS
Power Bank
USB Charging Port (5V)
DC/DC Micro Modules
2.9V to
5V Input
L1
1.2uH
C1
10uF
SW
VIN
EN
GND
MT5032
VOUT
R3
FB
R4
C2 C3
10uF 10uF
5.3V output
up to 2.1A
PGND
Rev. 0.3
www.cnzls.com
Figure 1. MT5032 Typical Application Circuit
M3tekic Confidential
1
1 page  
M3TEK
Preliminary Datasheet
MT5032
800kHz Synchronous Step-up Converter with 5.5A Switches
Detailed Description
The MT5032 is based on a fixed frequency current mode pulse width modulation topology. The peak current of the
NMOS switch is sensed to limit the maximum current flowing through the switch and the inductor. The typical peak
current limit is set to 5.5A. An internal temperature sensor prevents the device from getting overheated in case of
excessive power dissipation.
Application Information
Because of the high integration of MT5032, the application circuit is simple. Only input capacitor CIN, output capacitor
COUT, inductor L, output feedback resistors R3, R4 need to be selected for the targeted applications specifications.
Setting the Output Voltage
The MT5032output voltage can be adjusted with an external resistor divider (See Figure 1). The typical value of the
voltage on the FB pin is 500mV. The maximum allowed value for the output voltage is 5.5 V. Choose the bottom
resistor R4 in the 100kΩ~500kΩ range to set the divider current at 1 µA or higher. The value of resistor R3, depending
on the needed output voltage VOUT, can be calculated using Equation 1:
R3 =
R4
×
VOUT
VFB
−1 =
200kΩ×
VOUT
500mV
-1
(Equation 1)
Inductor Selection
The inductor DC current rating should be greater (by some margin) than the maximum input average current. The
highest peak current through the inductor and the switch depends on the output load, converter efficiency η, the input
voltage (VIN), and the output voltage (VOUT). Estimation of the maximum average inductor current can be done using
Equation 2:
IL
=
IOUT
× VOUT
VIN ×η
(Equation 2)
For example, for an output current of 2A at 5V with 90% efficiency, at least 3.8A of average current flows through the
inductor at a minimum input voltage of 2.9V.
The MT5032 step-up converters have been optimized to operate with an effective inductance in the range of 1µH to
2.2µH and with output capacitors in the range of 20µF to 100µF. The internal compensation is optimized for an output
filter of L = 1.5µH and COUT = 20µF. Larger or smaller inductor values can be used to optimize the performance of the
device for specific operating conditions.
Input Capacitor
Place at least a 10 µF input ceramic capacitor close to the IC is to improve transient behavior of the regulator and EMI
behavior of the total power supply circuit.
Rev. 0.3
www.cnzls.com
M3tekic Confidential
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MT5032.PDF ] | |
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