ST SPV1040 User Manual

High efficiency solar battery charger with embedded MPPT

TSSOP8

Features

■ 0.3 V to 5.5 V operating input voltage

■ 140 mΩ internal synchronous rectifier

■ 120 mΩ internal power active switch

■ 100 kHz fixed PWM frequency

■ Duty cycle controlled by MPPT algorithm

■ Output voltage regulation, overcurrent and

overtemperature protection

■ Input source reverse polarity protection

■ Built-in soft-start

■ Up to 95% efficiency

■ 3 mm x 4.4 mm TSSOP8 package

Applications

■ Smart phones and GPS systems

■ Wireless headsets

■ Small appliances, sensors

■ Portable media players

■ Digital still cameras

■ Toys and portable healthcare

Description

The SPV1040 device is a low power, low voltage,
monolithic step-up converter with an input voltage
range from 0.3 V to 5.5 V, and is capable of
maximizing the energy generated by even a single
solar cell (or fuel cell), where low input voltage
handling capability is extremely important.

SPV1040

Datasheet — production data

a resistor divider. The maximum output current is
set with a current sense resistor according to
charging current requirements.

The SPV1040 protects itself and other application
devices by stopping the PWM switching if either
the maximum current threshold (up to 1.8 A) is
reached or the maximum temperature limit (up to
155 °C) is exceeded.

An additional built-in feature of the SPV1040 is
the input source reverse polarity protection, which
prevents damage in case of reverse connection of
the solar panel at the input.

Table 1. Device summary

Order code Package Packaging

SPV1040T

TSSOP8

SPV1040TTR Tape and reel

Tube

Thanks to the embedded MPPT algorithm, even
under varying environmental conditions (such as
irradiation, dirt, temperature) the SPV1040 offers
maximum efficiency in terms of power harvested
from the cells and transferred to the output.

The device employs an input voltage regulation
loop, which fixes the charging battery voltage via

July 2012 Doc ID 18080 Rev 4 1/15

This is information on a product in full production.

www.st.com

15

Contents SPV1040

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.1 Soft-start mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.2 Startup mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3 MPPT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.4 Constant voltage regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.5 Constant current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.6 Overcurrent protection (OVC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.7 Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.8 Shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.9 Undervoltage lockout (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.10 Reverse polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.11 Burst mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6.12 Sleep-IN mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7 ECOPACK

® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2/15 Doc ID 18080 Rev 4

SPV1040 Block diagram

AM02612v1

Lx

XSHUT

GND

MPP-SET

VOUT

ICTRL_PLUS

VCTRL

ICTRL_MINUS

R

S

V

PV

L

R

1

R

2

C

IN

C

OUT

V

BATT

R

F1

R

F2

C

F

1 Block diagram

Figure 1. Block diagram

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For setting up the application and simulating the related test results please go to
www.st.com/edesignstudio

Doc ID 18080 Rev 4 3/15

Pin description SPV1040

VCTRL

GND

LX

VOUT

XSHUTMPP-SET 8

7

ICTRL_PLUS

1

2

6

3

4

5

ICTRL_MINUS

AM02613v1

2 Pin description

Table 2. Pin description

Pin Name Type Description

1 MPP-SET I

Non-inverting input to sense the PV cell voltage. It cannot be left
floating.

2 GND Ground Power ground reference.

Shutdown input pin:

8 XSHUT I

XSHUT = LOW: device in Power Off mode
XSHUT = HIGH: device enabled for Operating mode

This pin cannot be left floating.

3 LX I Booster inductor connection.

7 ICTRL_PLUS I

6 ICTRL_MINUS I

5 VCTRL I

Non-inverting input of constant current control loop. It cannot be left
floating.

Inverting input of constant current control loop.
It cannot be left floating.

Non-inverting input of constant voltage control loop.
It cannot be left floating.

4 VOUT O Booster output voltage.

Figure 3. Pin connection (top view)

4/15 Doc ID 18080 Rev 4

SPV1040 Maximum ratings

3 Maximum ratings

3.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Range [min, max] Unit

MPP-SET Analog input [-5.5, VOUT] V

GND Ground 0 V

XSHUT Analog input [-5.5, VOUT] V

LX Analog input [-5.5, VOUT] V

ICTRL_PLUS Analog input [-0.3, VOUT] V

ICTRL_MINUS Analog input [-0.3, VOUT] V

VCTRL Analog input [-0.3, VOUT] V

VOUT Analog output [-0.3, 5.5] V

3.2 Thermal data

Table 4. TSSOP8 thermal data

Symbol Parameter Value Unit

Note: R

R

th j-amb

Tj

op

Tstg Storage temperature -40 to 150 °C

was measured on a 2-layer PCB: FR4, 35 µm Cu thickness, 2.8 cm

thJA

Thermal resistance, junction-to-ambient 135 °C/W

Junction operating temperature -40 to 125 °C

2

Doc ID 18080 Rev 4 5/15