A6902D ,Up to 1 A Switch Step Down regulator with Adjustable Current Limit for Automotive ApplicationsElectrical characteristics . . . . . 65 Package mechanical data . . . . . 86 Order codes ..
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A6902D-A6902D13TR
Up to 1 A Switch Step Down regulator with Adjustable Current Limit for Automotive Applications
April 2009 Doc ID 13959 Rev 5 1/12
A6902DUp 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
Figure 1. Application schematic
Contents A6902D2/12 Doc ID 13959 Rev 5
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
A6902D Description
Doc ID 13959 Rev 5 3/12
1 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.
Pin connection A6902D
4/12 Doc ID 13959 Rev 5
2 Pin connection
2.1 Pin connection
Figure 2. Pin connection (top view)
2.2 Pin description
Table 1. Pin description
A6902D Electrical data
Doc ID 13959 Rev 5 5/12
3 Electrical data
3.1 Maximum ratings
3.2 Thermal data
Table 2. Absolute maximum ratings
Table 3. Thermal data Package mounted on board
Electrical characteristics A6902D
6/12 Doc ID 13959 Rev 5
4 Electrical characteristics
TJ = -40 to 125 °C, VCC = 12 V, unless otherwise specified
Table 4. Electrical characteristics
