Datasheet

ManualsBrandsST ManualsDC / DC ControllersDC/DC Converter, Charge Pump, 11.4 ... 12.6V, 30mA, SO-8

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

Summary of content (20 pages)

PAGE 1
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) SO-8 Description The ST662A is a regulated charge pump DC-DC converter.
PAGE 2
Contents ST662AB, ST662AC Contents 1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
ST662AB, ST662AC Application circuit 1 Application circuit Figure 1.
PAGE 4
Pin configuration ST662AB, ST662AC 2 Pin configuration Figure 2. Pin connections (top view) Table 2.
PAGE 5
ST662AB, ST662AC Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol VCC SHDN Parameter DC input voltage to GND Shutdown voltage Value Unit -0.3 to 6 V -0.3 to (VCC + 0.3) V IO Output current continuous 50 A PD Power dissipation 500 mW TOP Operating ambient temperature range TSTG Storage temperature range AC series 0 to 70 AB series -40 to 85 °C -40 to 150 °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
PAGE 6
Electrical characteristics 4 ST662AB, ST662AC 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. Table 5. Symbol Electrical characteristics Parameter Test conditions Min. Typ. Max. Unit IO = 0 to 20 mA 11.4 12 12.6 IO = 0 to 30 mA, VCC = 4.75 to 5.5 V 11.4 12 12.
PAGE 7
ST662AB, ST662AC Typical performance characteristics 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.
PAGE 8
Typical performance characteristics Figure 9. ST662AB, ST662AC Output voltage vs. shutdown input Figure 10. Output voltage vs. shutdown input voltage (No load) voltage (IOUT = 30 mA) Figure 11.
PAGE 9
ST662AB, ST662AC 6 Description 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.
PAGE 10
Description ST662AB, ST662AC Figure 13. Exiting shutdown Figure 14.
PAGE 11
ST662AB, ST662AC 7 Application circuit 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 Table 7.
PAGE 12
Application circuit ST662AB, ST662AC Figure 16. Electrical schematic Table 7. 7.1 List of component Capacitor Type Value (µF) Charge pump C1 Ceramic 0.22 Charge pump C1 Ceramic 0.22 Input C3 Electrolytic tantalum 4.7 Output C4 Electrolytic tantalum 4.7 Decoupling C5 Ceramic 0.1 ST662A output performance Figure 17. Output voltage vs. output current 12/20 Figure 18. Efficiency vs.
PAGE 13
ST662AB, ST662AC Application circuit 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.
PAGE 14
How to increase output current or output voltage capability 8 ST662AB, ST662AC 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.
PAGE 15
ST662AB, ST662AC How to increase output current or output voltage capability Figure 22. Application circuit for output voltage greater than 12 V Figure 23. Output voltage for application with Figure 24.
PAGE 16
Package mechanical data 9 ST662AB, ST662AC 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.
PAGE 17
ST662AB, ST662AC Package mechanical data SO-8 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8° (max.) 0.1 0.
PAGE 18
Package mechanical data ST662AB, ST662AC Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 18/20 Typ. 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.
PAGE 19
ST662AB, ST662AC Revision history 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.
PAGE 20
ST662AB, ST662AC Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.