M3TEK

Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

DESCRIPTION

FEATURES

The MT5032A 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 5V at a supply
voltage down to 3V. The maximum peak current
in the step-up switch is limited to a value of 5.5A.
The MT5032A 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.

L1
1.5uH
2.9V to
5V Input

C1
10uF

SW

Synchronous Step-up Converter with 2.1A
Output Current From 3V 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

VOUT

VIN
EN

R3
MT5032A

C2
10uF

C3
10uF

5.3V output
up to 2.1A

FB
R4

GND
PGND

Figure 1. MT5032A Typical Application Circuit

Rev. 0.1
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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

Ordering Information
Part No.

Marking

Temp. Range

Package

MT5032ANSPR

MT5032A

-40°C ~+85°C

SOP 8L 150

xxxxx

Remark

mils (EP)

Pin Configuration
MT5032A TOP View

Pin Description
NAME

PIN NO.

DESCRIPTION

VIN

1

Input Supply voltage

EN
GND

2
3

Enable input. (1/VIN enabled, 0/GND disabled)
Analog Ground pin. Connect GND to PGND under EP.

FB

4

VOUT

5

Voltage feedback of adjustable versions. Connect FB to GND and set fixed 5.1V
output voltage.
Step-up convert output

SW
PGND
EP

Rev. 0.1
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6, 7
8

Step-up and rectifying switch input
Power Ground pin.
Exposed pad must be soldered to achieve appropriate power dissipation.
Connect EP to GND.

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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

Absolute Maximum Rating (1)
Supply Voltage (VIN) …………………..

-0.3V to +6V

Lead Temperature…..………………………………260°C

Output Voltage (VOUT) …………………

-0.3V to +6V

Junction temperature range, TJ .……

-40°C

Input Voltage (EN, FB, SW) ……..……

-0.3V to +6V

Storage temperature range, Tstg ……

-55°C~+155°C

Peak Output Current

~+135°C

………………. Internally limited

Thermal Information
Maximum Power Dissipation(TA=+25°C )

……

2.6W

SOP8 EP Thermal resistance(θJA)

………

38.2°C/W

Recommend Operating Conditions (2)
Input Voltage (VIN) ……………………

+2.9V to +5.5V

Output Voltage (VOUT) ………………..

+2.9V to +5.5V

Operating Temperature Range ……

-40°C to +85°C

Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device.
Note (2): The device is not guaranteed to function outside the recommended operating conditions.

Electrical Characteristics
TA = +25°C, 2.9V ≤ VIN ≤ 5.5V, unless otherwise noted. Typical values are at VIN= VEN =3.6V and VOUT=5V.
PARAMETER

TEST CONDITIONS

Input voltage range VIN

MIN

TYP

2.5

Input Under-voltage Lockout

MAX

UNIT

5.5

V

2.2

V

Threshold VUVLO
Output voltage adjustable
2.5

5.5

V

range VOUT
Fixed Output Voltage

FB=GND

4.95

5.10

5.25

V

Feedback voltage VFB

490

500

510

mV

Oscillator frequency fOSC

640

800

960

kHz

NCH Switch Current Limit

VOUT= 5V

5.5

A

NCH Switch on resistance

VOUT= 5V

75

mΩ

PCH Switch on resistance

VOUT= 5V

75

mΩ

Shutdown Current

VEN = 0V, VIN = 3.6V

0.1

Rev. 0.1
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µA

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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

TEST CONDITIONS

PARAMETER
Quiescent Current

VIN

MIN

VFB =0.55V , VOUT=5V

TYP

MAX

UNIT

125

200

µA

0.4

V

EN logic low voltage
EN logic high voltage
EN leakage current

1.4
Clamped on GND or VIN

V

-1

1

µA

Thermal Shutdown

150

℃

Thermal Shutdown Hysteresis

20

℃

Functional Block Diagram

Figure 2. MT5032A Functional Block Diagram

Rev. 0.1
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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, MT5032A typical application circuit (Figure 1.), TA = +25°C, unless otherwise noted.

Efficiency vs. Load Current

Steady State
VIN=3.3V,VOUT=5.0V,ILOAD=0A

4 us/div

Steady State
VIN =3.3V, VOUT=5.0V, ILOAD=2A

4 us/div

Short Circuit
VIN =3.3V, VOUT=5V,
ILOAD=0.3A to Short Circuit

40 ms/div

Rev. 0.1
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Steady State
VIN =3.3V, VOUT=5.0V, ILOAD=0.1A

4 us/div

Steady State
VIN=4.19V, VOUT=5.0V, ILOAD=0.05A

Startup from Enable
Vin=3.3V,Vout=5.0V,Iload=1.5A

4 us/div

2 ms/div

Shutdown from Enable
VIN =3.3V, VOUT=5.0V,
ILOAD=1.5A

400 us/div

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Load Transient
VIN =3.3V, VOUT=5.0V,
ILOAD=0.2A~1.8A

200us/div

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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

Detailed Description
The MT5032A 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 MT5032A, 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 MT5032Aoutput 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:

V

 V

R3 = R 4 ×  OUT − 1 = 200kΩ×  OUT -1
 500mV 
 VFB


(Equation 1)

Inductor Selection
The MT5030A 800kHz high switching frequency allows for the use of small surface mount inductors. For high
efficiency, choose inductors with high frequency core material, such as ferrite, to reduce core losses. Also to improve
efficiency, choose inductors with bigger size for a given inductance. The inductor should have low DCR (copper-wire
resistance) to reduce I2R losses, and must be able to handle the peak inductor current without saturating. The
inductor DC current rating should be greater than the maximum input average current. For the full 2Amp output current
applications, the inductor shall have enough core volume to support peak inductor currents in the 4A to 7A range and
DCR less than 10mΩ. The highest peak current through the inductor and the switch depends on the output load,
converter efficiency η, the input voltage (VBAT), and the output voltage (VOUT). Estimation of the maximum average
inductor current can be done using Equation 3:

I L = I OUT ×

VOUT
VBAT ×η

(Equation 3)

For example, for an output current of 2A at 5V with 85% efficiency, at least 4.7A of average current flows through the
inductor at a minimum input voltage of 2.9V.
The MT5030 step-up converters can 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. To minimize radiated noise, use a toroidal or shielded inductor.

Rev. 0.1
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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

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.

Output Capacitor
The output capacitor must completely supply the load during the charging phase of the inductor. A reasonable value of
the output capacitance depends on the speed of the load transients and the load current during the load change. It is
recommended to use X7R ceramic capacitors placed as close as possible to the VOUT and PGND pins of the IC. A
recommended output capacitance value is around 20~100µF. Note that high capacitance ceramic capacitors have a
DC Bias effect, which will have a strong influence on the final effective capacitance. A 10 V rated 0805 capacitor with
10µF can have an effective capacitance of less 5µF at an output voltage of 5V.

Layout consideration
Use wide and short traces for the main current path and for the power ground tracks. The input capacitor, output
capacitor, and the inductor should be placed as close as possible to the IC. Use a common ground node for power
ground and a different one for analog ground to minimize the effects of ground noise. Connect these ground nodes at
any place close to the ground pins of the IC.

Thermal information
Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special
attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks
and convection surfaces, and the presence of other heat-generating components affect the power-dissipation limits of
a given component.
Three basic approaches for enhancing thermal performance are listed below:
High speed switching path (SW, PGND and VOUT with wide PCB traces) must be kept as short as possible.
Solder the exposed pad of the MT5030A to the ground plane with multiple big thermal vias.
Choose a bigger size 1.5uH Inductor with the lowest DCR value for given PCB space
The maximum junction temperature (TJ) of the MT5032A devices is 125℃.The thermal resistance of the SOP8_EP
package is RθJA = 38.2℃/W, if the Exposed PAD is soldered. Specified regulator operation is assured to a maximum
ambient temperature TA of +50℃. Therefore, the maximum power dissipation for the SOP8_EP package it is about
1.96W. More power can be dissipated if the maximum ambient temperature of the application is lower.

PD ( MAX ) =

Rev. 0.1
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TJ ( MAX ) − TA
Rθ JA

=

125o C-50o C
= 1.96W
38.2o C / W

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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

PACKAGING INFORMATION

MT5032A SOP 8L 150 mils(EP) Package Outline Dimensions

L

D

E

E2

E1

D1

A1

SYMBOLS

A

e

b

MILLIMETERS

INCHES

MIN.

MAX.

MIN.

MAX.

A

1.35

1.75

0.053

0.069

A1

0.10

0.25

0.004

0.010

D

4.90

0.193

E1

3.90

0.153

D1

2.00

0.081

E2

2.00

0.081

E

5.80

6.20

0.228

0.244

L

0.40

1.27

0.016

0.050

b

0.31

0.51

0.012

0.020

e
Rev. 0.1
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Preliminary Datasheet

MT5032A

800kHz Synchronous Step-up Converter with 5.5A Switches

Datasheet Revision History
REVISION

REVISION

NUMBER

DATE

0.1

2013/09/25

Rev. 0.1
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DESCRIPTION

PAGES
CHANGED

Initial release

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