MP2128 – 3MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
MP2128 Rev. 0.9 www.MonolithicPower.com 2
7/20/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking Temperature
MP2128DT SOT23 2H
–40°C to +85°C
Part Number** Package Top Marking Temperature
MP2128DG QFN8(2mmx2mm) 2H
–40°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP2128DT–Z). For RoHS Compliant Packaging, add suffix –LF (eg.
MP2128DT–LF–Z)
** For Tape & Reel, add suffix –Z (eg. MP2128DG–Z). For RoHS Compliant Packaging, add suffix –LF (eg.
MP2128DG–LF–Z)
PACKAGE REFERENCE
MARKING
TOP VIEW
EN
GND
SW
1
2
3
5
4
FB
IN
TOP VIEW
FB
AGND
PGND
IN
EN
NC
SW
SW
18
27
3
4
6
5
SOT23 QFN8
ABSOLUTE MAXIMUM RATINGS
(1)
IN to GND ..................................–0.3V to +6.5V
SW to GND ..........................
–0.3V to V
IN
+ 0.3V
FB, EN to GND.............................
–0.3V to +6.5V
Continuous Power Dissipation. (T
A
= +25°C)
(2)
SOT23 ..................................................... 0.57W
QFN8 (2mmx2mm) .................................... 2.5W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature...............
–65°C to +150°C
Recommended Operating Conditions
(3)
Supply Voltage V
IN
.............................2.5V to 6V
Output Voltage V
OUT
...........................0.6V to 6V
Operating Temperature..............
–40°C to +85°C
Thermal Resistance
(4)
θ
JA
θ
JC
SOT23 ................................... 220 .... 110.. °C/W
QFN8 (2mmx2mm)................. 50 ...... 12... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. Exceeding the maximum allowable powe
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
