Freescale Semiconductor
Advance Information
Document Number: MC34713
Rev. 5.0, 12/2008
5.0 A 1.0 MHz Fully Integrated
Single Switch-Mode Power
Supply
The 34713 is a highly integrated, space efficient, low cost, single
synchronous buck switching regulator with integrated N-channel
power MOSFETs. It is a high performance point-of-load (PoL) power
supply with the ability to track an external reference voltage in
different configurations.
Its high efficient 5.0 A continuous output current capability
combined with its voltage tracking/sequencing ability and tight output
regulation, makes it ideal as a single power supply.
The 34713 offers the designer the flexibility of many control,
supervisory, and protection functions to allow for easy implementation
of complex designs. It is housed in a Pb-free, thermally enhanced,
and space-efficient 24-Pin Exposed Pad QFN.
Features
• 50 mΩ integrated N-channel power MOSFETs
• Input voltage operating range from 3.0 to 6.0 V
•
±1%
accurate output voltage, ranging from 0.7 to 3.6 V
• Voltage tracking capability in different configurations.
• Programmable switching frequency range from 200 kHz to
1.0 MHz with a default of 1.0 MHz
• Programmable soft start timing
• Over-current limit and short-circuit protection
• Thermal shutdown
• Output over-voltage and under-voltage detection
• Active low power good output signal
• Active low shutdown input
• Pb-free packaging designated by suffix code EP.
34713
SWITCH-MODE POWER SUPPLY
EP SUFFIX
98ARL10577D
24-PIN QFN
ORDERING INFORMATION
Device
MC34713EP/R2
Temperature
Range (T
A
)
-40 to 85°C
Package
24 QFN
(3.0 TO 6.0 V) VIN
V
MASTER
VIN
34713
PVIN
BOOT
SW
INV
V
OUT
VREFIN
PGND
VDDI
FREQ
ILIM
GND
COMP
VIN
VOUT
PG
SD
MICROCONTROLLER
DSP,
FPGA,
ASIC
Figure 1. 34713 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-8. All rights reserved.
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
SD
Thermal
Monitoring
PG
M1
System
Reset
I
LIMIT
Discharge
Oscillator
FREQ
Prog Frequency
Buck
Control
Logic
System
Control
Internal
Voltage
Regulator
M2
V
DDI
VIN
BOOT
V
IN
V
BOOT
PVIN
F
SW
Gate I
SENSE
Driver
M3
SW
ILIM
Prog Soft Start
I
SENSE
V
DDI
Current
Monitoring
I
LIMIT
PWM
Comparator
M4
PGND
COMP
VDDI
Bandgap
Regulator
V
BG
Ramp
Generator
VREFIN
V
BG
GND
Reference
Selection
M5
Discharge
VOUT
Figure 2. 34713 Simplified Internal Block Diagram
34713
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
–
+
–
Error
Amplifier
+
INV
PIN CONNECTIONS
PIN CONNECTIONS
BOOT
VDDI
PVIN
20
24
GND
FREQ
ILIM
PG
NC
SD
1
2
3
4
5
6
7
VREFIN
23
22
21
19
18
17
PVIN
SW
SW
SW
PGND
PGND
Transparent
Top View
PIN 25
PVIN
16
15
14
13
12
PGND
VIN
8
NC
VIN
9
COMP
10
INV
11
VOUT
Figure 3. 34713 Pin Connections
Table 1. 34713 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on
page 10.
Pin Number
1
2
3
4
5, 8
6
7
9
10
11
12,13,14
15,16,17
18,19,20
21
22,23
24
Pin Name
GND
FREQ
ILIM
PG
NC
SD
Pin Function
Ground
Passive
Input
Output
None
Input
Input
Passive
Input
Output
Ground
Output
Supply
Passive
Supply
Passive
Formal Name
Signal Ground
Analog signal ground of IC
Definition
Frequency Adjustment Buck converter switching frequency adjustment pin
Soft Start
Power Good
No Connect
Shutdown
Voltage Tracking
Reference Input
Compensation
Error Amplifier
Inverting Input
Output Voltage
Discharge FET
Power Ground
Switching Node
Power-Circuit Supply
Input
Bootstrap
Logic-Circuit Supply
Input
Internal Voltage
Regulator
Soft Start adjustment
Active-low (open drain) power-good status reporting pin
No internal connections to these pins. Recommend attaching a 0.1 µF
capacitor from pin 8 to GND.
Shutdown mode input control pin
Voltage Tracking Reference voltage input
Buck converter external compensation network pin
Buck converter error amplifier inverting input pin
Discharge FET drain connection (connect to buck converter output
capacitors)
Ground return for buck converter and discharge FET
Buck converter power switching node
Buck converter main supply voltage input
Bootstrap switching node (connect to bootstrap capacitor)
Logic circuits supply voltage input
Internal Vdd Regulator (connect filter capacitor to this pin)
34713
VREFIN
COMP
INV
VOUT
PGND
SW
PVIN
BOOT
VIN
VDDI
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
Table 1. 34713 Pin Definitions (continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on
page 10.
Pin Number
25
Pin Name
GND
Pin Function
Ground
Formal Name
Thermal Pad
Definition
Thermal pad for heat transfer. Connect the thermal pad to the analog
ground and the ground plane for heat sinking.
34713
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings
All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or
permanent damage to the device.
Ratings
ELECTRICAL RATINGS
Input Supply Voltage (VIN) Pin
High Side MOSFET Drain Voltage (PVIN) Pin
Switching Node (SW) Pin
BOOT Pin (Referenced to SW Pin)
PG, VOUT,and SD Pins
VDDI, FREQ, ILIM, INV, COMP, and VREFIN Pins
Continuous Output Current
(1)
ESD Voltage
(2)
Human Body Model
Machine Model (MM)
Charge Device Model
THERMAL RATINGS
Operating Ambient Temperature
(3)
Storage Temperature
Peak Package Reflow Temperature During Reflow
(4)
,
(5)
Maximum Junction Temperature
Power Dissipation (T
A
= 85°C)
(6)
Notes
1. Continuous output current capability so long as T
J
is
≤
T
J(MAX)
.
2.
3.
4.
5.
ESD testing is performed in accordance with the Human Body Model (HBM) (C
ZAP
= 100 pF, R
ZAP
= 1500
Ω),
the Machine Model (MM)
(C
ZAP
= 200 pF, R
ZAP
= 0
Ω),
and the Charge Device Model (CDM), Robotic (C
ZAP
= 4.0 pF).
The limiting factor is junction temperature, taking into account power dissipation, thermal resistance, and heatsinking.
Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes
and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics.
Maximum power dissipation at indicated ambient temperature
T
A
T
STG
T
PPRT
T
J(MAX)
P
D
-40 to 85
-65 to +150
Note 5
+150
2.9
°C
°C
°C
°C
W
V
ESD1
V
ESD2
V
ESD3
±2000
±200
±750
V
V
IN
PV
IN
V
SW
V
BOOT
- V
SW
-
-
I
OUT
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 3.0
+5.0
V
V
V
V
V
V
A
Symbol
Value
Unit
6.
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
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