Document
ST2S06A33 ST2S06B - ST2S06D33
Dual synchronous rectification with reset or inhibit, 0.5 A, 1.5 MHz adjustable step-down switching regulator
Features
■
Step-down current mode PWM (1.5 MHz) DC-DC converter from 0.8 V
■ Fixed or adjustable output voltage www.DataSheet4U.com ■ 2% DC output voltage tolerance ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
Synchronous rectification Reset function for A and D versions Inhibit function for B version Internal soft start for start-up current limitation and power ON delay of 50-100 µs Typical efficiency: > 90% 0.5 A output current capability Non-switching quiescent current: max 1 mA over temperature range RDS(ON) 150 mΩ (typ.) Uses tiny capacitors and inductors Available in QFN12L (4x4 mm) the power dissipation may cause a high heating of the application environment. It provides up to 0.5 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.5 MHz allows the use of tiny surface-mount components as well as a resistor divider to set the output voltage value. Only an inductor and two capacitors are required. A low output ripple is guaranteed by the current mode PWM topology and the utilization of low ESR SMD ceramic capacitors. The device is thermally protected and current limited to prevent damage due to accidental short circuit. The ST2S06 series is available in the QFN12L (4x4 mm) package.
QFN12L (4x4 mm)
Description
The ST2S06 is a dual step-down DC-DC converter optimized for powering low-voltage digital cores in ODD applications and, generally, to replace the high current linear solution when
Table 1.
Device summary
Order code ST2S06APQR(1) ST2S06A33PQR ST2S06D33PQR ST2S06BPQR Package QFN12L (4x4 mm) QFN12L (4x4 mm) QFN12L (4x4 mm) QFN12L (4x4 mm) Packaging Tape and reel Tape and reel Tape and reel Tape and reel
1. Available on request.
March 2008
Rev 3
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Contents
ST2S06A33 - ST2S06B - ST2S06D33
Contents
1 2 3 4
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Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5 6 7 8 9
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ST2S06A33 - ST2S06B - ST2S06D33
Diagram
1
Figure 1.
Diagram
Schematic diagram
RESET_OUT *
VI_A
VI_SW
Delay
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Ref SW HV Trimming
FB1
VI_SW
FB2 CONTROL LOGIC
SW2
Ref
Soft Start
GND
INH**
GND
* ST2S06A/D ** ST2S06B
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Pin configuration
ST2S06A33 - ST2S06B - ST2S06D33
2
Figure 2.
Pin configuration
Pin connections (top view)
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Table 2.
Pin n° 1 2 3 4 5 6 7 8 9 10 11 12
Pin description
ST2S06A/D HV FB2 GND2 SW2 VIN_SW SW1 GND1 FB1/OUT1 Reset_out NC VIN_A GND_A ST2S06B HV FB2 GND2 SW2 VIN_SW SW1 GND1 FB1 NC INH VIN_A GND_A Name and function Programing pin. It must be floating or connected to GND. Feedback voltage Power ground Switching pin Power input voltage pin Switching pin Power ground Feedback voltage / output voltage Reset out pin Inhibit pin Supply for analog circuit System ground
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ST2S06A33 - ST2S06B - ST2S06D33
Maximum ratings
3
Table 3.
Maximum ratings
Absolute maximum ratings
Parameter Positive power supply voltage Positive power supply voltage Inhibit voltage Max. voltage of output pin Feedback voltage/output voltage Output voltage (for VO > 1.6 V) Common mode input voltage Max junction temperature Storage temperature range Lead temperature (soldering) 10 sec. Value -0.3 to 7 -0.3 to 7 -0.3 to 7 -0.3 to 7 -0.3 to 2.5 -0.3 to 5 +1 to -1 150 -65 to +150 300 Unit V V V V V V mA °C °C °C
Symbol VIN_SW VIN_A VINH SWITCH voltage VFB1,2/VO1
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VO1
Current into VFB pin TJ TSTG TLEAD
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Thermal data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient Value 10 60 Unit °C/W °C/W
Table 4.
Symbol RthJC RthJA
Table 5.
Symbol ESD
ESD performance
Parameter ESD protection voltage Test conditions HBM-DH11C Value 4 Unit kV
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Electrical characteristics
ST2S06A33 - ST2S06B - ST2S06D33
4
Table 6.
Electrical characteristics
Electrical characteristics for ST2S06A (VIN_SW = VIN_A = 5 V, VO1,2 = 1.2 V, C1 = 4.7 µF, C2 = C.