Data Sheet No. PD94173 revD
IRU3037/IRU3037A & (PbF)
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
Synchronous Controller ...
Data Sheet No. PD94173 revD
IRU3037/IRU3037A & (PbF)
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
Synchronous Controller in 8-Pin Package Operating with single 5V or 12V supply voltage Internal 200KHz Oscillator (400KHz for IRU3037A) Soft-Start Function Fixed Frequency Voltage Mode 500mA Peak Output Drive Capability Protects the output when control FET is shorted SOIC 8-Lead also available LEAD-FREE
APPLICATIONS
DDR memory source sink Vtt application Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V Graphic Card Hard Disk Drive
DESCRIPTION
The IRU3037 controller IC is designed to provide a low cost synchronous Buck
regulator for on-board DC to DC converter applications. With the migration of today’s ASIC products requiring low supply voltages such as 1.8V and lower, together with currents in excess of 3A, traditional linear
regulators are simply too lossy to be used when input supply is 5V or even in some cases with 3.3V input supply. The IRU3037 together with dual N-channel MOSFETs such as IRF7313, provide a low cost solution for such applications. This device features an internal 200KHz oscillator (400KHz for "A" version), under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected.
TYPICAL APPLICATION
12V
C3 C4 1uF 1uF
C2 10TPB100M, 100uF, 55mΩ
L1 1uH
5V
C1 47uF
C8 0.1uF
C9 2200pF
R4 24k
Vcc Vc HDrv
SS/SD U1 IRU3037
LD...