ST STODD01 User Manual

STODD01

Monolithic power management for high definition ODD with true

shut-down, reset, and programmable step-up voltage

Features

■ 1.2 MHz DC-DC current mode PWM converter

■ Dual step-down of up to 800 mA

■ Single step-up of up to 700 mA

■ 2 % DC output voltage tolerance for step-down

■ 3 % DC output voltage tolerance for step-up

■ Programmable step-up output voltage by S-

WIRE

■

Synchronous rectification

■ Power save mode at light load for step-down

■ Typical efficiency: > 90 %

■ Internal soft start with controlled inrush current

■ Reset function

■ Enable function for step-up

■ True cut-off function for step-up

■ Low switching quiescent current: max 2.2 mA

overtemperature range

■ Uses tiny capacitors and inductors

■ Available in QFN16 (4 x 4 mm.)

Description

The STODD01 is a complete power management for Blu-Ray, based on high density optical storage devices. It integrates two step-down converters and one step-up. The step-down converters are optimized for powering low-voltage digital core, up to 0.8 A, in ODD applications and, generally, to replace the high current linear solution when power dissipation may cause a high heating of the application environment. The step-up provides the necessary voltage to supply the blue laser in mobile applications where only 5 V is available. The output voltage is programmable by using the

Table 1. Device summary

S-Wire protocol, in the range of 6.5 V to 14 V, with a current capability of 0.7 A. The integrated low R

for N-channel and P-channel MOSFET

DSon

switches contribute to obtaining high efficiency. The enable function for the step-up section, and reset function for monitoring the input voltage, make the device particularly suitable for optical storage applications. The high switching frequency (1.2 MHz typ.) allows the use of tiny surface mounted components. Furthermore, a low output ripple is achieved by the current mode PWM topology and by the use of X7R or X5R low ESR SMD ceramic capacitors. The device includes soft-start control, thermal shutdown, and peak current limit, to prevent damage due to accidental overload. The STODD01 is packaged in QFN16 (4 x 4 mm.).

QFN16L (4 x 4 mm.)

Part number Order code Marking Package

STODD01 STODD01PQR ODD01 QFN16 (4 x 4 mm.)

February 2011 Doc ID 17789 Rev 2 1/31

www.st.com

31

Contents STODD01

Contents

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

2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 S-wire protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.1 Brief overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.2 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.3 TX pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.4 Reset function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.5 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.6 Overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

9 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.2 Programming the output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.3 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9.4 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.5 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

10 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2/31 Doc ID 17789 Rev 2

STODD01 Block diagram

1 Block diagram

Figure 1. STODD01 block diagram

SW1

EN

V

IN_A

V

IN_P

Reset

TX

S-Wire

Reset

Step-Up 700mA

ch1

Step-Down

800mA

ch2

Step-Down

800mA

ch3

Out1

FB1

SW2

FB2

SW3

FB3

GND GND

Doc ID 17789 Rev 2 3/31

Absolute maximum ratings STODD01

2 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

IN_A

IN_P

Analog input voltage - 0.3 to 7 V

Power input voltage - 0.3 to 7 V

EN Enable voltage - 0.3 to 7 V

SW1 Switch pin for ch1 - 0.3 to 16 V

SW2,SW3 Switch pin for ch2 and ch3 - 0.3 to 7 V

OUT1 Output voltage for ch1 - 0.3 to 16 V

FB1 Feedback pin for ch1 - 0.3 to 2.5 V

FB2 Feedback pin for ch2 - 0.3 to 5 V

FB3 Feedback pin for ch3 - 0.3 to 2.5 V

Reset Reset pin - 0.3 to V

+ 0.3 V

IN

TX S-wire pin - 0.3 to 7 V

T

J

STG

JOP

Maximum junction temperature 150 °C

Storage temperature range - 65 to + 150 °C

Operating junction temperature range - 25 to + 125 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these conditions is not implied.

Table 3. Thermal data

Symbol Parameter Value Unit

R

thJC

thJA

Thermal resistance junction-case 2.5 °C/W

Thermal resistance junction-ambient 46 °C/W

Table 4. ESD

Symbol Parameter Value Unit

HBM Human body model 2 kV

MM Machine model 200 V

4/31 Doc ID 17789 Rev 2

STODD01 Pin configuration

3 Pin configuration

Figure 2. Pin connection (top through view)

Table 5. Pin description

Pin n° Symbol Name and function

1 GND_P Power Ground pin (ch1)

2 FB1 Step-up feedback pin (ch1)

3V

IN_A

Power Supply for internal analog circuits

4 FB2 Step-down feedback pin (ch2)

5 GND_P Power Ground pin (ch2)

6 SW2 Step-down switching pin (ch2)

7V

IN_P

Power input voltage pin

8 SW3 Step-down switching pin (ch3)

9 GND_P Power Ground pin (ch3)

10 FB3 Step-down feedback pin (ch3)

11 GND_A Analog Ground pin

12 OUT1 Step-up output voltage

13 TX S-Wire pin. If connected to GND, V

FB1

=0.8V

(1)

14 SW1 Step-up switching pin (ch1)

Enable pin. Connecting the pin to a voltage higher than 1.2 V the step-up is

15 EN

ON.Connecting the pin to a voltage lower than 0.4 V the step-up is OFF, resulting in no current flow to the load

16 Reset Reset pin. It is an open drain output

Exposed pad Ground and thermal dissipation pad

1. If this function is not used, the TX pin must be connected to GND

Doc ID 17789 Rev 2 5/31

Typical application STODD01

4 Typical application

Figure 3. Application circuit

L1

C1

V

IN

C3

C2

Reset

EN

TX

C1

R5

V

IN_A

V

IN_P

Reset

EN

TX

GND

SW1

STODD01

GNDGND

Out1

FB1

SW2

FB2

SW3

FB3

GND

R1

R2

L2

L3

R3

R4

C4

C5

C6

V

OUT1

OUT2

OUT3

Note: If the S-wire function is not used, the TX pin must be connected to GND.

Table 6. List of external components

Component Manufacturer Part number Value Size

C1, C2, C3 Murata GRM21BR61A106KE19L 10 µF 0805

C4, C5, C6 Murata GRM32ER61C226KE20L 22 µF 1210

L1 Coilcraft LPS6225-472MLB 4.7 µH 6 x 6 x 2.5

L2, L3 Coilcraft LPS4018-332MLB 3.3 µH 4.1 x 4.1 x 1.8

R1 33 kΩ (V

R2 3.3 kΩ 0603

R3 27 kΩ (V

R4 47 kΩ 0603

R5 100 kΩ

1. The components listed above refer to typical applications. Operation of the STODD01 is not limited to the choice of these external components.

2. R1 and R2 are calculated according to the following formula:

R1 = R2 x (V

OUT1/VFB1

3. R3 and R4 are calculated according to the following formula:

R3 = R4 x (V

OUT3/VFB3

4. It is recommended to use resistors with values in the range of 100kΩ to 1MΩ.

- 1). It is recommended to use resistors with values in the range of 1 kΩ to 50 kΩ.

(1)

OUT1

OUT3

= 8.8 V)

= 1.2 V)

(2)

(3)

(4)

0603

6/31 Doc ID 17789 Rev 2

STODD01 Electrical characteristics

5 Electrical characteristics

V

= V

IN_P

C

= 22 µF, L1 = 4.7 µH, L2 = L3 = 3.3 µH, TJ = - 25 to 125 °C (unless otherwise

4,5,6

specified; typical values are referred to T

Table 7. Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

= VEN = 5 V, V

IN_A

OUT1

= 9 V, V

= 3.3 V, V

OUT2

= 25 °C).

J

OUT3

= 1.2 V, C

1,2,3

= 10 µF,

V

IN

I

SUPPLY

Step-up section

V

OUT

V

FB1

I

FB1

I

OUT1_OFF

(leak)

V

OVP Overvoltage protection

OUT1

R

DSon_N

R

DSon_P

I

SW1 (leak)

I

SW1 (LIM)

PWM f

s

D

MAX

ν Efficiency

V

EN_H

V

EN_L

I

EN

ΔV

/ΔVINLine transient response

OUT1

ΔV

/ΔI

OUT1

OUT

ΔV

/ΔVINStartup transient

OUT1

Input voltage range 4 6 V

V

> 1.2 V, No Switching 1.6 2.2 mA

Supply current

EN

V

< 0.4 V, No Switching 1.2 2.0 mA

EN

Output voltage range 6.5 14 V

Prog. feedback voltage range

I

= 50 mA (prog. by S-Wire

OUT1

see Figure 9 and Ta b le 9 )

0.776 0.8 0.824 V

Feedback voltage accuracy -3 3 %

Feedback current V

= 0 V, VEN= 2 V 600 nA

FB1

Output leakage current VEN= 0 V, TJ = -25 to 80 °C 20 µA

(1)

V

= 0 V 14.8 15.3 15.8 V

FB1

Internal N-channel R

Internal P-channel R

DSon

Internal leakage current V

SW Current limitation V

Oscillator frequency to be measured on t

Max duty cycle on SW1 pin, V

Enable threshold high V

Enable threshold low V

Enable pin current V

Load transient response

(2)

I

=400 mA 300

SW1

I

=400 mA 300

SW1

OUT1

I

OUT1

I

OUT1

I

OUT1

I

OUT1

=4 to 6 V, I

IN

= 4 to 6 V, I

IN

= VIN = 5 V 2 µA

EN

VIN from 4 to 6 V, I

(2)

mA, t

V

(2)

= 5 V, I

IN

= 4 V, V

= 9.2 V 2.6 A

=50 mA, V

=700 mA, V

=100 mA, V

=700 mA, V

= tF => 30 µs, TJ=25 °C

R

= 2 V, VEN= 0 V 2 µA

FB1

= 0.7 V 70 90 %

FB1

OUT1

from 100 mA to

OUT1

500 mA, tR = tF => 5µs, TJ=25 °C

V

from 0 to 5 V, I

IN

OUT1

pin 0.75 1.2 1.5 MHz

SW1

=7 V 80 %

=7 V 90 %

=9 V 75 %

=9 V 90 %

= 50 mA 1.2

= 50 mA 0.4

= 500

-5 5

= 500 mA -10 10

V

mΩ

V

%

OUT

%

OUT

%

OUT

Doc ID 17789 Rev 2 7/31

Electrical characteristics STODD01

Table 7. Electrical characteristics (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

t

START

Startup time VEN from 0 to 5 V, I

Inrush current V

Step-down section

%V

ΔV

I

ΔV

OUT2,3

FB

2

I

FB2

FB

3

I

FB3

I

OUT2,3

OUT_MIN

OUT2,3

PWM f

OUT2

OUT3

D

MAX

I

SWL

I

LKP2,3

I

LKN2,3

R

DSon-N

R

DSon-P

T2,3

Feedback voltage 3.23 3.3 3.37 V

FB2 Pin bias current V

Feedback voltage 0.784 0.8 0.816 mV

FB3 Pin bias current V

Output current

Minimum output current 0 mA

Reference load regulation 10 mA < I

PWM Switching frequency I

S

/ΔVINLine regulation 4 V < V

Maximum duty cycle V

Switching current limitation 1.5 A

PMOS Leakage current

NMOS Leakage current

NMOS Switch on resistance ISW = 250 mA 0.2 0.4 W

PMOS Switch on resistance ISW = 250 mA 0.3 0.5 W

/ΔI

OU

Load transient response

ν Efficiency V

Reset section

OUT3

OUT2

(3)

= 1.2 V

= 3.3 V

=100 mA 500 µs

OUT1

=9.25 V, I

OUT

= 3.5 V 15 20 µA

FB2

= 1 V 600 nA

FB3

=100 mA 1.3 A

OUT

VIN = 4 to 6 V 700 800 mA

< 0.8 A 5.5 15 mV

OUT2,3

= 0.3 A 1.2 MHz

OUT2,3

< 6 V 0.032

IN

< 6 V 0.15

IN

(2)

= 3.0 V, V

FB2

= 3.5 V, V

V

FB2

= GND, TJ=- 25 to 80 °C

V

SW2,3

= 3.5 V, V

V

FB2

V

= 5 V, TJ =- 25 to 80 °C

SW2,3

100 mA < I

=> 100 ns, TJ = 25 °C

t

F

I

OUT3

I

OUT3

I

OUT2

I

OUT2

OUT2,3

= 100 mA 65

= 800 mA 80

= 100 mA 75

= 800 mA 90

= 0.7 V

FB3

= 0.9 V,

FB3

= 0.9 V,

FB3

< 500 mA, tR =

85 94 %

0.1 µA

-5 +5

V

%

OUT

/V

%

OUT

/V

%

OUT

%

IN

t

V

DEL

R_TH

Delay time TJ = 25 °C 100 ms

V

Rising (see Figure 12 and

IN

Figure 29) (measured on input

voltage pin)

Reset threshold

V

Falling (see Figure 12 and

IN

V

R_TL

Figure 29) (measured on input

voltage pin)

8/31 Doc ID 17789 Rev 2

4.3 4.4

V

4.1 4.2

STODD01 Electrical characteristics

Table 7. Electrical characteristics (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

RL

I

RH

Reset output voltage low

Reset leakage current

V output

V °C

Thermal section

T

SHDN

T

HYS

1. If V

OUT1

2. Guaranteed by design, but not tested in production.

3. V

= 90 % of nominal value

OUT

Thermal shutdown

Thermal shutdown hysteresis

> OVP voltage the device stops to switch.

(2)

=4 V, I

IN

=5 V, V

IN

=6 mA open drain

SINK

=5 V, TJ=-25 to 80

RES

0.4 V

5 200 nA

130 150 °C

15 °C

Doc ID 17789 Rev 2 9/31

S-wire protocol STODD01

6 S-wire protocol

Table 8. Timing

Parameter Symbol Min. Typ. Max. Unit

S-Wire signal start (see Figure 5, 6, 7, 8)t

S-Wire signal stop (see Figure 5, 6, 7, 8)t

S-Wire signal off (see Figure 5, 6, 7, 8)t

S-Wire high (see Figure 5, 6, 7, 8)t

S-Wire low (see Figure 5, 6, 7, 8)t

S-Wire rising time (see Figure 4)t

S-Wire falling time (see Figure 4)t

FB Voltage delay t

S-Wire threshold high (see Figure 4)V

S-Wire threshold low (see Figure 4)V

SW_START

SW_STOP

SW_OFF

SW_H

SW_L

SW_R

SW_F

SW_DELAY

SW_TH

SW_TL

300 500 µs

270 µs

25 50 µs

200 ns

20 µs

1.6 V

00.4V

IN

Note: These are recommended values for proper operation of the S-wire interface.

The S-wire input pin is able to detect pulses also outside these ranges. Consequently, care must be taken to avoid noise injected into the S-wire pin.

Figure 4. S-wire pulse thresholds

AM07818v1

V

SW_TH

V

SW_TL

90%

10%

T

SW_R

10/31 Doc ID 17789 Rev 2

T

SW_F

ST STODD01 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table 1. Device summary

1 Block diagram

Figure 1. STODD01 block diagram

2 Absolute maximum ratings

Table 2. Absolute maximum ratings

Table 3. Thermal data

Table 4. ESD

3 Pin configuration

Figure 2. Pin connection (top through view)

Table 5. Pin description

4 Typical application

Figure 3. Application circuit

Table 6. List of external components

5 Electrical characteristics

Table 7. Electrical characteristics

6 S-wire protocol

Table 8. Timing

Figure 4. S-wire pulse thresholds