MC34700_09 Datasheet, PDF (1/28 Pages) Freescale Semiconductor, Inc – 9.0 to 18 V, Quad Output, Integrated MOSFET Power Supply

Freescale Semiconductor
Technical Data
Document Number: MC34700
Rev. 5.0, 10/2009
9.0 to 18 V, Quad Output,
Integrated MOSFET Power
Supply
MC34700
POWER SUPPLY
98ASA10800D
The 34700 is a compact, high-efficiency power supply with on-chip
power MOSFETs that features three step-down switching regulators
32-Pin QFN, 5 x 5mm
and one low dropout linear regulator. The switching regulators utilize
voltage mode control with external compensation, allowing flexibility in
ORDERING INFORMATION
optimizing the performance of the 34700 for a given application.
The 34700 is ideal for space constrained applications where
multiple power rails are required and simplicity of design and
implementation of the power supply is necessary. Over-voltage,
Device
MC34700EP/R2
Temperature
Range (T_A)
-40°C to 85°C
Package
32 QFN
under-voltage, over-current, and over-temperature protection
features ensure robust and reliable operation. Fixed switching
frequency, internal soft-start, and internal power MOSFETs enable
rapid power supply design and development.
The 34700 is well suited for power supply designs in wide variety
of applications, including set top boxes, cable modems, laser
printers, fax machines, point-of-sale terminals, small appliances,
telecom line cards, and DVD players.
Typical Applications:
• Set Top Boxes and Receivers
• Cable Modems
• Networking Cards
• Telecom Line Cards
Features
• Three switching regulators: 2 synchronous and 1 non-
synchronous
• One low dropout linear regulator
• Output current capability:
• 1.5 A continuous on channel 1
• 1.25 A continuous on channels 2 and 3
• 400 mA continuous on channel 4
• Internal power MOSFETs on all channels
• Voltage feed-forward on channel 1
• ±1.5% Output voltage accuracy on all channels
• Cycle-by-cycle current limit and short-circuit protection
• Fixed 800 kHz switching frequency
• Internal soft-start
• Over-voltage, under-voltage and over-temperature
protection
• Open-drain power-good output signal
• Separate active-high enable input for each channel
• Pb-free packaging designated by suffix code EP
V_IN1
9 V - 18 V
MC34700
VIN VIN1
VDDI
VGREG
PGOOD
Enable 1
Enable 2
Enable 3
Enable 4
EN1
EN1
EN1
EN_LDO
AGND
GND2
GND3
VOUT1 VIN2 VIN3 BST1
SW1
COMP1
FB1
BST2
SW2
COMP2
FB2
BST3
SW3
COMP3
FB3
LDO_VIN
LDO
LDO_FB
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2009. All rights reserved.
VOUT1
2.0 - 5.25 V, 1.5 A
VOUT2
0.7 - 3.6 V, 1.25 A
VOUT3
0.7 - 3.6 V, 1.25 A
VOUT4
0.7 - 3.6 V, 0.4 A