A6902D Datasheet PDF - ST Microelectronics

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A6902D
ST Microelectronics

Part Number A6902D
Description Up to 1 A step down switching regulator
Page 12 Pages


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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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Contents
Contents
A6902D
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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A6902D
1 Description
Description
The A6902D is a complete and simple step down switching regulator with adjustable current
limit. Based on a voltage mode structure it integrates a current error amplifier to have a
constant voltage and constant current control. By means of an on board current sense
resistor and the availability of the current sense pins (both compatible to Vcc and for Cs-
compatible with GND too) a current limit programming is very simple and accurate.
Moreover constant current control can be used to charge NiMH and NiCd batteries.The
device can be used as a standard DC/DC converter with adjustable current limit (set by
using the external sense resistor). The internal robust P-channel DMOS transistor with a
typical of 250 mΩ assures high efficiency and a minimum dropout even at high output
current level. The internal limiting current (latched function) of typical value of 2.5 A protects
the device from accidental output short circuit avoiding dangerous loads damage. If the
temperature of the chip goes higher than a fixed internal threshold (150 °C with 20 °C
hysteresis), the power stage is turned off.
Other protections beside thermal shutdown complete the device for a safe and reliable
application: overvoltage protection, frequency folback overcurrent protection and protection
vs. feedback disconnection. The internal fixed switching frequency of 250 kHz, and the
SO-8 package pin allow to built an ultra compact DC/DC converter with a minimum board
space.
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Pin connection
2 Pin connection
2.1 Pin connection
Figure 2. Pin connection (top view)
A6902D
2.2
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Pin description
Table 1.
1
2
3
4
5
6
7
8
Pin description
Pin Description
OUT
Regulator output.
CS+ Current error amplifier input (current sense at higher voltage)
CS- Current error amplifier input (current sense at lower voltage)
COMP E/A output for frequency compensation.
Feedback input. Connecting directly to this pin results in an output
FB voltage of 1.23 V. An extenal resistive divider is required for higher
output voltages.
VREF
GND
3.3 V reference voltage. No cap is need for stability.
Ground.
VCC
Unregulated DC input voltage.
4/12 Doc ID 13959 Rev 5



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A6902D Up to 1 A step down switching regulator A6902D
ST Microelectronics
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