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MCZ34702 데이터시트 PDF




Freescale Semiconductor에서 제조한 전자 부품 MCZ34702은 전자 산업 및 응용 분야에서
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부품번호 MCZ34702 기능
기능 3.0A Switch-Mode Power Supply
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MCZ34702 데이터시트, 핀배열, 회로
Freescale Semiconductor
Technical Data
3.0A Switch-Mode Power
Supply with Linear Regulator
The 34702 provides the means to efficiently supply the Freescale
Power QUICC™ I, II, and other families of Freescale
microprocessors and DSPs. The 34702 incorporates a high
performance switching regulator, providing the direct supply for the
microprocessor’s core, and a low dropout (LDO) linear regulator
control circuit providing the microprocessor I/O and bus voltage.
The switching regulator is a high efficiency synchronous buck
regulator with integrated N-channel power MOSFETs to provide
protection features and to allow space-efficient, compact design.
The 34702 incorporates many advanced features; e.g., precisely
maintained up/down power sequencing, ensuring the proper
operation and protection of the CPU and power system.
Features
• Operating voltage from 2.8V to 6.0V
• High-accuracy output voltages
• Fast transient response
• Switcher output current up to 3.0A
• Under-voltage lockout and over-current protection
• Enable inputs and programmable watchdog timer
• Voltage margining via I2C™ bus
• Reset with programmable power-ON delay
• Pb-free packaging designated by suffix code EW
I2C is a trademark of Philips Corporation.
Document Number: MC34702
Rev 7.0, 8/2007
34702
POWER SUPPLY
EW (PB-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
MCZ34702EW/R2
Temperature
Range (TA)
-40 to 85°C
Package
32 SOICW
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Optional
2.8 V to 6.0 V Input
34702
VIN2 VIN1
VBD
VBST
RT
LDRV
CS
LDO
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
CLKSEL
FREQ
LFB
RST
BOOT
SW
VOUT
PGND
INV
VDDI
Other
Circuits
Adjustable:
0.8 V to VIN -
Dropout
VDDH (I/Os)
MPC8xxx
VBST
PORESET
Adjustable:
0.8 V to VIN -
Dropout
VDDL (Core)
Figure 1. 34702 Simplified Application Diagram
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., 2007. All rights reserved.




MCZ34702 pdf, 반도체, 판매, 대치품
PIN CONNECTIONS
Table 1. Pin Function Description (continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on page 16.
Pin Pin Name
Formal Name
Definition
20 CS
Current Sense
Current sense pin of the LDO. Over-current protection of the linear regulator external
power MOSFET. The voltage drop over the LDO current sense resistor RS is sensed
between the CS and LDO pins. The LDO current limit can be adjusted by selecting
the proper value of the current sensing resistor RS.
21 LDRV
Linear Drive
LDO gate drive of the external pass N-channel MOSFET.
22 VIN1
Input Voltage 1
The input supply pin for the integrated circuit. The internal circuits of the IC are
supplied through this pin.
23 VDDI
26 ADDR
Power Supply
Address
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is
recommended.
I2C address selection. This pin can either be left open, tied to VDDI, or grounded
through a 10kresistor.
27 EN1
Enable 1
Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2
inputs determines operation mode and type of power sequencing of the IC.
28 EN2
Enable 2
Enable 2 Input. The combination of the logic state of the Enable 1 and Enable 2
inputs determines operation mode and type of power sequencing of the IC.
29 RT
Reset Timer
This pin allows programming of the Power-ON Reset delay by means of an external
RC network.
30 RST
Reset Output
(Active LOW)
The reset control circuit monitors both the switching regulator and the LDO feedback
voltages. It is an open drain output and has to be pulled up to some supply voltage
(e.g., the output of the LDO) by an external resistor.
31 CLKSEL
Clock Selection
This pin sets the CLKSYN pin as either an oscillator output or a synchronization input
pin. The CLKSEL pin is also used for the I2C address selection.
32
CLKSYN
Clock Synchronization Oscillator output/synchronization input pin.
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34702
4
Analog Integrated Circuit Device Data
Freescale Semiconductor

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MCZ34702 전자부품, 판매, 대치품
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics
Characteristics noted under conditions -40°C TA 85°C unless otherwise noted. Input voltages VIN1 = VIN2 = 3.3V using
the typical application circuit (see Figure 33), unless otherwise noted.
Characteristic
Symbol
Min Typ Max Unit
GENERAL
Operating Voltage Range (VIN1, VIN2)
VIN 2.8 – 6.0 V
Start-up Voltage Threshold (Boost Switching)
VST – 1.6 1.8 V
VBST Under-voltage Lockout (VBST rising)
VBST_UVLO
5.5
6.5 V
VBST Under-voltage Lockout Hysterisis
VBST_UVLO_HYS
0.5
1.5 V
Input DC Supply Current (Normal Operation Mode, Enabled), Unloaded
Outputs
IIN
– 60 – mA
VIN1 Pin Input Supply Current (EN1 = EN2 = 0)
VIN2 Pin Input Leakage Current (EN1 = EN2 = 0)
VDDI Internal Supply Voltage
VDDI Maximum Output Current (Externally Loaded)
BUCK CONVERTER
Buck Converter Feedback Voltage(7), (8)
IVOUT = 15mA to 3.0A. Includes Load Regulation Error
IIN1
IIN2
VDDI
IDDI
VINV
– 10 – mA
– 100 – µA
2.9 – 3.3 V
– – -10 mA
0.784
0.800
0.816
V
Buck Converter Voltage Margining Step Size
Buck Converter Voltage Margining Highest Positive Value
Buck Converter Voltage Margining Lowest Negative Value
Buck Converter Line Regulation(7), (8)
VIN1 = VIN2 = 2.8V to 6.0V, IVOUT = 15mA to 3.0A
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Buck Converter Load Regulation(7), (8)
VIN1 = VIN2 = 2.8V to 6.0V, IVOUT = 15mA to 3.0A
VMVO
– 1.0 – %
VMP
5.9 7.0 7.9 %
VMN
-7.9 7.0 -5.9 %
REGLNVO
-1.0
%
1.0
REGLDVO
-1.0
%
1.0
VOUT Input Leakage Current
VOUT = 5.25V
INV Input Leakage Current
INV = 0.8V
IVOUTLK
INVLEAK
– 3.5
-1.0
mA
1.0 µA
Notes
7. Design information only. This parameter is not production tested.
8. VOUT refers to load current on output switcher.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34702
7

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