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A5973D
Up to 2 A step down switching regulator for automotive applications
Features
Qualified following the AEC-Q100 requirements (temperature grade 3), see PPAP for more details. Temperature range -40 C to +85 C 2 A DC output current Operating input voltage from 4 V to 36 V 3.3 V / (2 %) reference voltage Output voltage adjustable from 1.235 V to 35 V Low dropout operation: 100 % duty cycle 250 kHz Internally fixed frequency Voltage feedforward Zero load current operation Internal current limiting Inhibit for zero current consumption Synchronization Protection against feedback disconnection Thermal shutdown The A5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.25 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an HSOP8 package with exposed frame, that allows to reduce the Rth(JA) down to approximately 40C/W. The device uses an internal P-channel DMOS transistor (with a typical RDS(on) of 250 m) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.
L1 15uH

HSOP8 exposed pad
Description
Applications
Dedicated to automotive applications
Figure 1.
Application schematic
VCC COMP
C4
VIN=4V to 35V
8 4 1 2
OUT SYNCH
Vout=3.3V
A5973D
FB 6 5 7 GND INH 3
D1 STPS340U
R1 5k6 C2 330uF 6.3V R2 3k3
C1 10uF 35V CERAM IC C3 220pF
22nF
R3 4k7
VREF 3.3V
May 2008
Rev 4
1/11
www.st.com 1
A5973D
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 4 5 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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Pin settings
A5973D
1
1.1
Pin settings
Pin connection
Figure 1. Pin connection (top view)
1.2
Pin description
Table 1.
N 1 2 3 4 5 6 7 8
Pin description
Pin OUT SYNCH INH COMP FB VREF GND VCC Regulator output. Master/slave synchronization. A logical signal (active high) disables the device. If INH not used the pin must be grounded. When it is open an internal pull-up disable the device. E/A output for frequency compensation. Feedback input. Connecting directly to this pin results in an output voltage of 1.23 V. An extenal resistive divider is required for higher output voltages. 3.3 V VREF. No cap is requested for stability. Ground. Unregulated DC input voltage. Description
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A5973D
2
2.1
Electrical data
Maximum ratings
Table 2.
Symbol V8 V1 I1 V4 , V5 V3 V2 PTOT TJ TSTG Input voltage OUT pin DC voltage OUT pin peak voltage at t = 0.1 s Maximum output current Analog pins INH SYNCH Power dissipation at TA 70 C Operating junction temperature range Storage temperature range
Absolute maximum ratings
Parameter Value 40 -1 to 40 -5 to 40 int. limit. 4 -0.3 to VCC -0.3 to 4 2.25 -40 to 150 -55 to 150 V V V W C C Unit V V V
2.2
Thermal data
Table 3.
Symbol RthJA
Thermal data
Parameter Maximum thermal resistance junction-ambient SO8 40 (1) Unit C/W
1. Package mounted on board
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Electrical characteristics
A5973D
3
Electrical characteristics
Table 4.
Symbol VCC RDS(on) IL fSW
Electrical characteristics (TJ = -40 C to 125 C, VCC = 12 V, unless otherwise specified)
Parameter Operating input voltage range MOSFET on resistance Maximum limiting current Switching frequency Duty cycle VCC = 5 V 2.25 212 0 Test condition V0 = 1.235 V; I0 = 2 A Min 4 0.250 3 250 Typ Max 36 0.5 3.5 280 100 Unit V A kHz %
Dynamic characteristics (see test circuit). V5 Voltage feedback Efficiency 4.4 V < VCC < 36 V, 20 mA < I0 < 2 A V0 = 5 V, VCC = 12 V 1.198 1.235 90 1.272 V %
DC characteristics Iqop Iq Iqst-by Inhibit Device ON INH threshold voltage Device OFF Error amplifier VOH VOL Io source Io sink Ib High level output voltage Low level output voltage Source output current Sink output current Source bias current DC open loop gain RL = 50 VFB = 1 V VFB = 1.5 V VCOMP = 1.9 V; VFB = 1 V VCOMP = 1.9 V; VFB = 1.5 V 190 1 300 1.5 2.5 65 4 3.5 0.4 V V A mA A dB 2.2 V 0.8 V Total operating quiescent current Quiescent current Total stand-by quiescent current Duty cycle = 0; VFB=1.5 V Vinh > 2.2 V VC C= 36 V; Vinh > 2.2 V 50 80 3 5 2.5 100 150 mA mA A A
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A5973D Table 4.
Symbol gm
Electrical characteristics (continued) (TJ = -40 C to 125 C, VCC = 12 V, unless otherwise specified)
Parameter Transconductance Test condition ICOMP = -0.1 mA to 0.1 mA; VCOMP = 1.9 V Min Typ 2.3 Max Unit mS
Synch function High input voltage Low input voltage Slave synch current Master output amplitude Output pulse width Reference section Reference voltage IREF = 0 to 5 mA VCC = 4.4 V to 36 V Line regulation Load regulation Short circuit current
1. Guarantee by design
VCC= 4.4 to 36 V; VCC= 4.4 to 36 V; Vsynch= 0.74 V (1) Vsynch= 2.33 V Isource= 3 mA no load, Vsynch= 1.65 V
2.5
VREF 0.74
V V mA
0.11 0.21 2.75 0.20 3 0.35
0.25 0.45
V s
3.2
3.3
3.399
V
IREF = 0 mA VCC = 4.4 V to 36 V IREF = 0 mA 5
5 8 18
10 15 35
mV mV mA
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Typical characteristics
A5973D
4
Typical characteristics
Figure 2. Line regulatior Figure 3. Shutdown current vs junction temperature
Figure 4.
Output voltage vs junction temperature
Figure 5.
Switching frequency vs junction temperature
Figure 6.
Quiescent current vs junction temperature
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A5973D Figure 7. Junction temperature vs output current Figure 8. Junction temperature vs output current
Figure 9.
Efficiency vs output current
Figure 10. Efficiency vs output current
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Package mechanical data
A5973D
5
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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A5973D Table 5.
Dim Min A A1 A2 b c D D1 E E1 E2 e h L k ccc 0.25 0.40 0.00 1.25 0.31 0.17 4.80 3 5.80 3.80 2.31 4.90 3.1 6.00 3.90 2.41 1.27 0.50 1.27 0.0098 0.0157 0.0197 0.0500 0.51 0.25 5.00 3.2 6.20 4.00 2.51 Typ Max 1.70 0.10 0.0492 0.0122 0.0067 0.1890 0.118 0.2283 0.1496 0.091 0.095 0.1929 0.122 0.0201 0.0098 0.1969 0.126 0.2441 0.1575 0.099 0.00 Min Typ Max 0.0669 0.0039
HSOP8 mechanical data
mm inch
0 (min), 8 (max) 0.10 0.0039
Figure 11. Package dimensions
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Revision history
A5973D
6
Revision history
Table 6.
Date 06-Aug-2007 23-Oct-2007 07-Jan-2008 02-May-2008
Document revision history
Revision 1 2 3 4 Initial release Updated: Table 4 on page 5, Table 5 on page 10 Updated Table 5 on page 10 Updated Table 4 on page 5 Changes
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A5973D
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