IBM THINKPAD T60 DC 1.8V 0.9V CIRCUIT FAST TEST WAY

Input DC 20V (VINT20, test point 1), after power management chip U7 (MAX8632) processing, output DC 1.8V voltage (6A VCC1R8A, test point 2).

12-Pin of U7 (MAX8632) output DC 0.9V (VCC0R9B, test point 3).

Complementary push-pull circuit Q43 Q49, opposite phase PWM  pulse signal to control mosfet (test point 4). Look at their waveform on the picture.....read more