Datasheet

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LDOLoad2 A
(-) (+)
(-) (+)
LDOINExternalSupplyVoltage
Range1.5Vto3.4V@3.5 A
5VDCSupplyVoltage
CurrentLimited@1 A
(+)
(-)
VINDCSupplyVoltage
CurrentLimit@5 A
Range3Vto25V
(+)
(-)
VOSWLoad
0-15 A
(+)
(-)
Hardware
Figure 7. Test Setup
• Standard Test Procedures
– Required Equipment:
• 3 x Bench power supplies (V5in supply 4.75 V to 5.25 V at 1 A), (Vin supply 3 V to 25 V at 5 A),
(LDO_IN 1.5 V to 3.4 V at 3.5 A).
• 2 x Electronic loads one capable of sinking 19 A at 1.2 V and the other capable of sinking 4 A at
1.2 V.
– Switch Settings:
• DAC1 = ON, Switcher operates in the high-performance range (1.2-V output).
• LDO (ON/OFF) = Enables or disables the LDO output (1.2 V at 2 A).
• SW (ON/OFF) = Enables or disables the Switcher output. (1.2 V at 15 A) (Low-current skip
mode current >2 A operates in PWM mode.
– Bootstrap Diode:
• Bootstrap diode D1 is not populated on the current evaluation module because the TPS51511
has a built-in bootstrap diode. In order to further improve the efficiency, D1 can be added.
SLVU196 – May 2007 High-Performance Synchronous Buck EVM 9
Using the TPS51511
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