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A6902D Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer A6902D
Beschreibung Up to 1 A step down switching regulator
Hersteller ST Microelectronics
Logo ST Microelectronics Logo 




Gesamt 12 Seiten
A6902D Datasheet, Funktion
A6902D
Up to 1 A step down switching regulator with adjustable
current limit for automotive applications
Features
Qualified following the AEC-Q100
requirements (see PPAP for more details)
Up to 1 A DC output current
Operating input voltage from 8 V to 36 V
Output voltage adjustable from 1.235 V to 35 V
Precise 3.3 V (±2 %) reference voltage
250 kHz Internally fixed frequency
Voltage feedforward
Zero-load current operation
Internal current limiting
Protection against feedback disconnection
Thermal shutdown
Applications
Automotive applications
Adjustable current generator
Simple step-down converters with adjustable
current limit
SO-8
Figure 1. Application schematic
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VIN=8V to 36V
C1
10µF
35V
VIN=8V to 36V
C3
220pF
VCC
VREF
COMP
C2
22nF
R3
5.1kO
L6902D
GND
OUT
CS+
CS-
FB
L1 22µH
D1
STPS340U
Rsense
100mO
VOUT=3.3V
R1
5.6kO
R2
3.3kO
C4
100µF
10V
April 2009
Doc ID 13959 Rev 5
1/12
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12






A6902D Datasheet, Funktion
Electrical characteristics
4 Electrical characteristics
A6902D
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6/12
TJ = -40 to 125 °C, VCC = 12 V, unless otherwise specified
Table 4. Electrical characteristics
Symbol
Parameter
Test conditions
VCC
Operating input
voltage range
V0 = 1.235 V; I0 = 2 A
RDS(on)
MOSFET on
resistance
Maximum limiting
IL current (1)
VCC = 8.5 V
VCC = 8.5 V, TJ = 25 °C
fSW Switching frequency
Duty cycle
Dynamic characteristics (see test circuit)
V5 Voltage feedback
η Efficiency
DC characteristics
8 V < VCC < 36 V,
20 mA < I0 < 1 A
V0 = 5 V, VCC = 12 V
Iqop
Total operating
quiescent current
Iq Quiescent current
Error amplifier
Duty cycle = 0; VFB = 1.5 V
VOH
High level output
voltage
VFB=1 V
VOL
Low level output
voltage
VFB=1.5 V
Io source
Io sink
Ib
Source output current
Sink output current
Source bias current
VCOMP = 1.9 V;
VFB = 1 V
VCOMP = 1.9 V;
VFB = 1.5 V
DC open loop gain RL=
gm Transconductance
VOFFS Input offset voltage
ICS+ CS+ output current
ICS- CS- output current
ICOMP = -0.1 mA to 0.1 mA;
VCOMP = 1.9 V
VCS- = 1.8 V;
VCS+ = Vcomp
I0 =1 A; RSENSE =100 mΩ;
VOUT < VCC-2 V
I0 =1A; RSENSE =100 mΩ;
VOUT < VCC-2 V
Min. Typ. Max.
8 36
0.250 0.5
1.8 2.5 3.2
2 2.5 3.2
212 250 280
0 100
1.198 1.235 1.272
90
35
2.7
3.6
0.4
160 300
1 1.5
2.5
50 58
2.3
4
90 100 110
1.5 3
1.5 3
Unit
V
Ω
A
kHz
%
V
%
mA
mA
V
V
μA
mA
μA
dB
mS
mV
μA
μA
Doc ID 13959 Rev 5

6 Page









A6902D pdf, datenblatt
A6902D
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