ST662ABD-TRY - STMicroelectronics, Inc.

August 2010 Doc ID 5068 Rev 8 1/20

ST662AB

ST662AC

DC-DC converter from 5 V to 12 V, 0.03 A

for Flash memory programming supply

Features

■Output voltage: 12 V ± 5 %

■Supply voltage range: 4.5 V to 5.5 V

■Guaranteed output current up to 30 mA

■Very low quiescent current: 100 µA

■Logic controlled electronic shutdown: 1 µA

■Just capacitors needed (no inductor)

Description

The ST662A is a regulated charge pump DC-DC

converter. It provides 12 V ± 5 % output voltage to

program byte-wide Flash memory, and can supply

30 mA output current from input as low as 4.75 V.

A logic controlled shut down pin that interfaces

directly with microprocessor reduces the supply

current to only 1 µA. The ST662AB is available as

Automotive Grade in SO-8 package. This device

is qualified according to the specification AEC-

Q100 of the Automotive market, in the

temperature range - 40 °C to 125 °C, and the

statistical tests PAT, SYL, SBL are performed.

SO-8

Table 1. Device summary

Order codes Package

ST662ABD-TR SO-8 (tape and reel)

ST662ABD-TRY (1) SO-8 (tape and reel)

ST662ACD-TR SO-8 (tape and reel)

1. Automotive Grade products.

www.st.com

Contents ST662AB, ST662AC
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Contents
Application circuit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application circuit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1 ST662A output performance   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
How to increase output current or output voltage capability  . . . . . . . 14
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision history   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

ST662AB, ST662AC Application circuit

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1 Application circuit

Figure 1. Typical application circuit

Pin configuration ST662AB, ST662AC

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2 Pin configuration

Figure 2. Pin connections (top view)

Table 2. Pin description

Pin n° Symbol Name and function

1 C1- Negative terminal for the first charge pump capacitor

2 C1+ Positive terminal for the first charge pump capacitor

3 C2- Negative terminal for the second charge pump capacitor

4 C2+ Positive terminal for the second charge pump capacitor

CC Supply voltage

OUT 12 V output voltage VOUT = VCC when in shutdown mode

7 GND Ground

8 SHDN

Active high C-MOS logic level shutdown input. SHDN is internally pulled up to VCC.

Connect to GND for normal operation. In Shutdown mode the charge pumps are turned

off and VOUT = VCC

ST662AB, ST662AC Maximum ratings

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3 Maximum ratings

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

Functional operation under these condition is not implied.

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

VCC DC input voltage to GND -0.3 to 6 V

SHDN Shutdown voltage -0.3 to (VCC + 0.3) V

IOOutput current continuous 50 A

PDPower dissipation 500 mW

TOP Operating ambient temperature range AC series 0 to 70 °C

AB series -40 to 85

TSTG Storage temperature range -40 to 150 °C

Table 4. Thermal data

Symbol Parameter SO-8 Unit

RthJC Thermal resistance junction-case 20 °C/W

Electrical characteristics ST662AB, ST662AC

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4 Electrical characteristics

Refer to the test circuits, VCC = 4.5 V to 5.5 V, TA = TMIN to TMAX, unless otherwise

specified. Typical value are referred at TA = 25 °C.

Refer to the test circuits, VCC = 4.5 V to 5.5 V, TA = -40 to 125 °C, unless otherwise

specified. Typical value are referred at TA = 25 °C.

Table 5. Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

VOOutput voltage IO = 0 to 20 mA 11.4 12 12.6 V

IO = 0 to 30 mA, VCC = 4.75 to 5.5 V 11.4 12 12.6

IQ1 Quiescent current NO LOAD, VSHDN = 0 100 500 µA

IQ2 Shutdown current NO LOAD, VSHDN = VCC 110µA

ISH Shutdown pin current VSHDN = 0, VCC = 5V -50 -12 -5 µA

VSHDN = VCC = 5V 0 µA

VIL Shutdown input low threshold 0.4 V

VIH Shutdown input high threshold 2.4 V

fOOscillator frequency VCC = 5 V, IO = 30 mA 400 kHz

n Power efficiency VCC = 5 V, IO = 30 mA 72 %

RSW VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 µA 1 2 kΩ

Table 6. Electrical characteristics for ST662AB-TRY (Automotive Grade)

Symbol Parameter Test conditions Min. Typ. Max. Unit

VOOutput voltage IO = 0 to 20 mA 11.2 12 12.8 V

IO = 0 to 30 mA, VCC = 4.75 to 5.5 V 11.2 12 12.8

IQ1 Quiescent current NO LOAD, VSHDN = 0 100 500 µA

IQ2 Shutdown current NO LOAD, VSHDN = VCC 115µA

ISH Shutdown pin current VSHDN = 0, VCC = 5V -50 -12 -5 µA

VSHDN = VCC = 5V, TA = 25°C 0 µA

VIL Shutdown input low threshold 0.4 V

VIH Shutdown input high threshold 2.4 V

fOOscillator frequency VCC = 5 V, IO = 30 mA, TA = 25°C 400 kHz

n Power efficiency VCC = 5 V, IO = 30 mA, TA = 25°C 72 %

RSW VCC - VOUT switch impedance VSHDN = VCC = 5V, IO = 100 µA 1 2 kΩ

ST662AB, ST662AC Typical performance characteristics

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5 Typical performance characteristics

Figure 3. Output voltage vs. temperature

(IOUT = 50 mA)

Figure 4. Output voltage vs. temperature

(IOUT = 30 mA)

Figure 5. Supply current vs. temperature Figure 6. Supply current vs. supply voltage

Figure 7. SHDN pin current vs. temperature Figure 8. Output voltage vs. shutdown input

Typical performance characteristics ST662AB, ST662AC

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Figure 9. Output voltage vs. shutdown input

voltage (No load)

Figure 10. Output voltage vs. shutdown input

voltage (IOUT = 30 mA)

Figure 11. Test circuit

ST662AB, ST662AC Description

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6 Description

The ST662 is an IC developed to provide a 12 V regulated output 30 mA from voltage input

as low as 4.75 without any inductors. It is useful for a wide range of applications and its

performances make it ideal for Flash memory programming supply.

An evaluation kit is provided to facilitate the application. This include a single-side demo

board designed for surface-mount components.The operating principle of ST662 (see

Figure 12) is to charge C1 and C2 capacitor by closing the S1 switch (while S2 is opened) at

the VCC voltage. After S1 is opened and S2 closed so that C1 and C2 capacitors are placed

in series one to each other, and both are in series with VIN. The sum of VC1 and VC2 and VI

is applied to the capacitor C4. This works as voltage triple. An amplifier error checks the

output voltage and blocks the oscillator if the output voltage is greater than 12 V. The

shutdown pin is internally pulled to VCC. When it is held low the output voltage rises to

+12 V. Figure 13 shows the transition time of the shut down pin when the VSHDN goes from

5 V to 0 V. Input logic levels of this input are CMOS compatible Applying a logic high at this

input, the VOUT oscillator is blocked and the VOUT is reach the VI value by D1. In this

condition ICC is low as 1 µA. The Figure 14 shows the transition time of the shut down pin

when the VSHDN goes from 0 V to 5 V.

Figure 12. Operating principle circuit

Description ST662AB, ST662AC

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Figure 13. Exiting shutdown Figure 14. Entering shutdown

VCC = 5 V, IOUT = 200 µA

ST662AB, ST662AC Application circuit

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7 Application circuit

Based on fast charge/discharge of capacitors, this circuit involves high di/dt values limited

only by RON of switches. This implies a critical layout design due to the need to minimize

inductive paths and place capacitors as close as possible to the device.

A good layout design is strongly recommended for noise reason. For best performance, use

very short connections to the capacitors and the values shown in Ta b l e 7 .

C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be

reduced to 2 µF and 1 µF, respectively, when using ceramic capacitors, but must be of 10 µF

or larger if aluminium electrolytic are chosen.

C5 must be placed as close to the device as possible and could be omitted if very low output

noise performance are not required.

Figure 15 and Figure 16 show, respectively, our EVALUATION kit layout and the relatively.

Figure 15. KIT layout

Application circuit ST662AB, ST662AC

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7.1 ST662A output performance

Figure 16. Electrical schematic

Table 7. List of component

Capacitor Type Value (µF)

Charge pump C1 Ceramic 0.22

Input C3 Electrolytic tantalum 4.7

Output C4 Electrolytic tantalum 4.7

Decoupling C5 Ceramic 0.1

Figure 17. Output voltage vs. output current Figure 18. Efficiency vs. output current

ST662AB, ST662AC Application circuit

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Figure 19. Load transient response

(IOUT = 0 to 30 mA)

Figure 20. Load transient response

(IOUT = 30 mA)

VCC = 5 V, IOUT = 0 to 30mA

VCC = 4.5 to 5.5V, IOUT = 30 mA

How to increase output current or output voltage capability ST662AB, ST662AC

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8 How to increase output current or output voltage

capability

Current capability is limited by RON of internal switches. It is possible to increase it

connecting in parallel two or more ST662A devices; each one of them can supply 30 mA.

The Figure 19 shows the electric schematic. The capacitors C3, C4 and C5 must be placed

very close to the ICs on the board. If this is not possible, you can place two different

capacitors, each of them of half value, very close to the respective integrated circuit.

Figure 23 show the output current capability of the proposed circuit.

If an output voltage greater than 12 V is required, it’s possible to realize the circuit of the

following diagram Figure 22. The relevant output current capability is shown in Figure 24 in

which is shown the output voltage vs. load current.

Figure 21. Application circuit for two ST662A in parallel

Table 8. List of component

Capacitor Type Value (µF)

C1A Ceramic 0.22

C2A Ceramic 0.22

C1B Ceramic 0.22

C2B Ceramic 0.22

C3 Electrolytic Tantalum 10

C4 Electrolytic Tantalum 10

C5 Ceramic 0.22

ST662AB, ST662AC How to increase output current or output voltage capability

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Figure 22. Application circuit for output voltage greater than 12 V

Figure 23. Output voltage for application with

two device in parallel

Figure 24. Output voltage for application with

output voltage greater than 12 V

Package mechanical data ST662AB, ST662AC

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9 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK® is an ST trademark.

ST662AB, ST662AC Package mechanical data

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Dim. mm. inch.

Min. Typ. Max. Min. Typ. Max.

A1.35 1.75 0.0530.069

A1 0.10 0.25 0.04 0.010

A2 1.10 1.65 0.0430.065

B0.33 0.51 0.0130.020

C0.190.25 0.007 0.010

D4.80 5.00 0.189 0.197

E3.80 4.00 0.150 0.157

e 1.27 0.050

H5.80 6.20 0.2280.244

h 0.25 0.50 0.010 0.020

L 0.40 1.27 0.016 0.050

k8° (max.)

ddd 0.1 0.04

SO-8 mechanical data

0016023/C

Package mechanical data ST662AB, ST662AC

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Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A330 12.992

C 12.813.2 0.504 0.519

D 20.2 0.795

N60 2.362

T 22.4 0.882

Ao 8.1 8.5 0.3190.335

Bo 5.5 5.90.216 0.232

Ko 2.1 2.30.082 0.090

Po 3.94.1 0.1530.161

P7.98.1 0.311 0.319

Tape & reel SO-8 mechanical data

ST662AB, ST662AC Revision history

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10 Revision history

Table 9. Document revision history

Date Revision Changes

16-Jul-2007 5 Device summary updated.

07-Feb-2008 6 Modified: Table 1 on page 1.

19-Feb-2008 7 Add new order code for Automotive grade products see Table 1 on page 1.

03-Aug-2010 8 Modified Features on page 1.

ST662AB, ST662AC

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