DESCRIPTION
The LTM®4638 is a complete 15A step-down switching
mode μModule (power module) regulator in a tiny
6.25mm × 6.25mm × 5.02mm BGA package. Included
in the package are the switching controller, power FETs,
inductor and support components. Operating over an
input voltage range of 3.1V to 20V, the LTM4638 supports
an output voltage range of 0.6V to 5.5V, set by a
single external resistor. Its high efficiency design delivers
up to 15A continuous output current. Only bulk input and
output capacitors are needed. The LTM4638 product video
is available on the website.
The LTM4638 supports selectable discontinuous mode
operation and output voltage tracking for supply rail sequencing.
Its high switching frequency and current mode
control enable a very fast transient response to line and
load changes without sacrificing stability.
Fault protection features include overvoltage, overcurrent
and overtemperature protection.
The LTM4638 is available with SnPb or RoHS compliant
terminal finish.

FEATURES
n Complete Solution in <1cm2 (Single-Sided PCB) or
0.5cm2 (Dual-Sided PCB)
n 6.25mm × 6.25mm × 5.02mm BGA Package
n Wide Input Voltage Range: 3.1V to 20V
n 0.6V to 5.5V Output Voltage
n 15A DC Output Current
n ±1.5% Maximum Total DC Output Voltage Error
Over Line, Load and Temperature
n Differential Remote Sensing Amp
n Current Mode Control, Fast Transient Response
n External Frequency Synchronization
n Multiphase Parallel Current Sharing with
Multiple LTM4638s
n Output Voltage Tracking
n Selectable Discontinuous Mode
n Power Good Indicator
n Overvoltage, Overcurrent and Overtemperature Protection

APPLICATIONS
n Telecom, Datacom, Networking and
Industrial Equipment
n Medical Diagnostic Equipment
n Data Storage Rack Units and Cards
n Test and Debug Systems