MC34704AEP Freescale Semiconductor, MC34704AEP Datasheet

IC POWER MANAGEMENT 56-QFN

MC34704AEP

Manufacturer Part Number
MC34704AEP
Description
IC POWER MANAGEMENT 56-QFN
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC34704AEP

Applications
Processor
Current - Supply
86mA
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-20°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
56-QFN
Output Voltage
5 V
Input Voltage
2.7 V to 5.5 V
Switching Frequency
750 KHz to 2 MHz
Mounting Style
SMD/SMT
Number Of Outputs
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC34704AEP
Manufacturer:
FREESCALE
Quantity:
5
Freescale Semiconductor
Technical Data
© Freescale Semiconductor, Inc., 2008 - 2011. All rights reserved.
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
Multiple Channel DC-DC Power
Management IC
to address power management needs for various multimedia
application microprocessors. Its ability to provide either 5 or 8
independent output voltages with a single input power supply (2.7
and 5.5 V) together with its high efficiency, make it ideal for portable
devices powered up by Li-Ion/polymer batteries or for USB powered
devices as well.
of operating at a switching frequency of up to 2.0 MHz. This makes it
possible to reduce external component size and to implement full
space efficient power management solutions.
Features
• 8 DC/DC (34704A) or 5 DC/DC (34704B) switching regulators with
• Dynamic voltage scaling on all regulators.
• Selectable output voltage or current regulation on REG8
• I
• Output under-voltage and over-voltage detection for each
• Over-current limit detection and short-circuit protection for each
• Thermal limit detection for each regulator, except REG7
• Integrated compensation for REG1, REG3, REG6, and REG8
• 5.0 µA maximum shutdown current (All regulators are off, 5.5 V VIN)
• True cutoff on all of the boost and buck-boost regulators
• Pb-free packaging designated by suffix code EP
The 34704 is a multi-channel Power Management IC (PMIC) used
The 34704 is housed in a 7x7 mm, Pb-free, QFN56 and is capable
up to ±2% output voltage accuracy
regulator
regulator
2
C programmability
34704A/B
Figure 1. 34704 Simplified Application Diagram
*REG 1
*REG 6
*REG 7
REG 8
REG 4
REG 3
REG 2
REG 5
PGND
I
2
V
V
V
C COMM
CORE
IO1
IO2
* Available only in 34704A device
V
V
BKL
DDR
MPU
MEMORY
DDR
GND
+5V
VREF+ (5 to 16V)
VREF- (-5 to -9V)
MC34704AEP/R2
MC34704BEP/R2
Device
LCD
GND
ORDERING INFORMATION
EP SUFFIX (PB-FREE)
MULTI-CHANNEL IC
34704
98ASA10751D
Document Number: MC34704
-20°C to 85°C
Temperature
56-PIN QFN
Range (T
A
)
Rev. 5.0, 2/2011
56 QFN EP
Package

Related parts for MC34704AEP

MC34704AEP Summary of contents

Page 1

... True cutoff on all of the boost and buck-boost regulators • Pb-free packaging designated by suffix code EP 34704A/B 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., 2008 - 2011. All rights reserved. MC34704AEP/R2 MC34704BEP/R2 V BKL REG 8 V ...

Page 2

... DEVICE VARIATIONS Table 1. Device Variations Orderable Part Number MC34704AEP/R2 MC34704BEP/R2 34704 2 DEVICE VARIATIONS No. of Regulators 8 5 Regulator Number Reg Reg Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 3

... FB5 VG VDDI VDDI (2.5V) VDDIMON (VDDIdet) SCL SDA RST Reset Driver VIN AGND Analog Integrated Circuit Device Data Freescale Semiconductor INTERNAL BLOCK DIAGRAM voltage data voltage data Control Control L Error Amp Error Amp PWM P-skip Start-Up Ipeak-det and blanking Error Amp ...

Page 4

... Connect a 0.01 μF capacitor between this pin and SW3 pin to REG3 bootstrap capacitor input pin enhance the gate of the Switch Power MOSFET. 42 BT2U 41 ONOFF 40 LION 39 VDDI VIN 38 AGND 37 Exposed Pad PGND5 36 PGND PGND4 35 NC4 34 33 AGND3 PGND2 32 NC3 31 AGND1 30 NC2 29 34704B page 17. Definition Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 5

... VREF7 Output B NC2 No Connect Analog Integrated Circuit Device Data Freescale Semiconductor Formal Name REG3 power supply input This is the connection to the drain of the high side switch FET. voltage Input decoupling /filtering is required for proper REG3 operation. Use a 10uf decoupling capacitor for better performance. ...

Page 6

... Switch Power MOSFET. pin REG2 power supply input This is the connection to the drain of the high side switch FET. voltage Input decoupling /filtering is required for proper REG2 operation. Use a 10uf decoupling capacitor for better performance page 17. Definition Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 7

... Tied to GND, SW node: Tied to GND, DRV node: Tied to GND (REG7 only), COMP pin: Not connected, PVIN Pin: Not connected. 3. REG 2,3 and 4 should always be populated. Analog Integrated Circuit Device Data Freescale Semiconductor Formal Name REG2 Buck Stage The inductor is connected between this pin and the SW2U pin. ...

Page 8

... V ±1000 ESD1 V ±500 ESD2 +150 J(MAX) T -65 to +150 STG PD 2 Θ ΘJB T Note 6 PPRT = 1500 Ω), and the Charge Device = 100 pF, R ZAP Analog Integrated Circuit Device Data Freescale Semiconductor Unit °C °C W °C/W °C ...

Page 9

... SW1 Leakage Current (Off State) @ 25°C Peak Current Detection Threshold at Power Up Notes: 9. Guaranteed by Design 10. Available only on the 34704A Analog Integrated Circuit Device Data Freescale Semiconductor ≤ 5 20°C ≤ T ≤ 85°C, GND = 0 V, unless otherwise noted. Typical 25°C under nominal conditions, unless otherwise noted. A Symbol ...

Page 10

... 1.0 % (12) 0.600 - V - 17 150 550 500 - mΩ 500 - mΩ Ω 170 - ° °C μA - 1.0 μA - 1.0 reference. FB Freescale Semiconductor ...

Page 11

... Guaranteed by Design 14 0.6V when the part ist powered up and no DVS is changed. DVS is achieved by modifying V FB Analog Integrated Circuit Device Data Freescale Semiconductor STATIC ELECTRICAL CHARACTERISTICS ≤ 5 20°C ≤ T ≤ 85°C, GND = 0 V, unless otherwise noted. Typical 25°C under nominal conditions, unless otherwise noted. ...

Page 12

... 200 - mΩ - 600 - mΩ - 200 - mΩ Ω 170 - ° °C μ 1.0 -5.0 -7.0 -9.0 V -2.0 - 2.0 % -1.0 - 1.0 % (17) - 0.600 - Ω 0.8 1 1 1.43 - 1.57 V 1.43 - 1.57 V reference. FB Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 13

... When in Current regulation mode, the Voltage reference is set to 0.230mV to set the maximum current, and it is internally decreased to achieve a factor of the maximum current passing through the LED string Analog Integrated Circuit Device Data Freescale Semiconductor ≤ 5 20°C ≤ T ≤ 85°C, GND = 0 V, unless otherwise noted. Typical ...

Page 14

... Frequency programed with external components should be 1500 kHz SW1 Min Typ Max Unit - $ 400 kHz 750 - 2000 kHz 250 - 1000 kHz - 250 - kHz - - - μ 750 - 1500 kHz - 250 - kHz μs - 1.0 - μ 750 - 2000 kHz - 250 - kHz Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 15

... Operating Frequency Selections Operating Frequency Selection Step Size REGULATOR 8 Operating Frequency Operating Frequency Selection Step Size Analog Integrated Circuit Device Data Freescale Semiconductor DYNAMIC ELECTRICAL CHARACTERISTICS ≤ 5.5V, -20°C ≤ T ≤ 85°C, GND = 0V, unless otherwise noted. Typical 25°C under nominal conditions, unless otherwise noted. ...

Page 16

... C) turns the 34704 off. Enable/disable control is also granted through I IC. MAX (MA) TARGET APPLICATION 500 +5.0 V REF 500 µP I/O 550 µP Core 300 DDR 500 µP I/O 60 REF+ 60 REF - 30 Backlight Display 2 C for groups of regulators and the whole Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 17

... This is the connection to the drain of the high side switch FET. Input decoupling /filtering is required for proper REG3 operation. Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL PIN DESCRIPTION REG3 SWITCHING NODE (SW3) The inductor is connected between this pin and the regulated REG3 output. ...

Page 18

... Connect a 1.0 μF capacitor between this pin and SW2D pin to enhance the gate of the Switch Power MOSFET. REG2 POWER SUPPLY INPUT VOLTAGE (PVIN2) This is the connection to the drain of the high side switch FET. Input decoupling /filtering is required for proper REG2 operation. Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 19

... REG5 BUCK STAGE SWITCHING NODE (SW5D) The inductor is connected between this pin and the SW5U pin. Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION REG5 POWER SUPPLY INPUT VOLTAGE (PVIN5) This is the connection to the drain of the high side switch FET ...

Page 20

... A soft over-current limit (over-current limit): If the peak current reaches the typical over-current limit, the switcher will start a cycle-by-cycle operation to limit the current and current limit timer starts. The switcher will stay in this mode of operation until the part regains normal * Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 21

... During power up the 34704 reads the SS terminal to configure a default soft start timing for all regulators when these are enabled. Soft start for REG5 to REG8 can be Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL INTERNAL BLOCK DESCRIPTION 2 changed via any time after power up has successfully completed ...

Page 22

... There is no GrpB shutdown command through the I interface AND • No faults exist that would cause GrpB to shut down REG3 This is a synchronous buck PWM voltage-mode control DC/DC regulator for more details on SW1 N-channel power DS(ON Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 23

... Characteristics • It powers up directly from the battery • Operates at a switching frequency equals to F Analog Integrated Circuit Device Data Freescale Semiconductor for more details on • Drives integrated low R MOSFETs (NHV_HC) as its output stage • The output is ±2% accuracy • Output voltage is adjustable by means of an external resistor divider • ...

Page 24

... The processor would set the REG8 register through I before enabling REG8 to indicate if voltage regulation or 2 current regulation will be used. C Characteristics • It powers up directly from the battery for more details on SW2 for more details Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 25

... regulation AND • There is no GrpD shutdown command through the I interface AND • No faults exist that would cause GrpD to shut down Analog Integrated Circuit Device Data Freescale Semiconductor FUNCTIONAL INTERNAL BLOCK DESCRIPTION OVERALL EFFICIENCY ANALYSIS SW2 In battery applications highly recommended to power ...

Page 26

... Overall System 1.74 0.192 0.202 1.942 89.6% Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 27

... IOUT REG4 Efficiency 100% 90% 80% 70% 60% 50% 40% 30% 20% 10 100 150 200 IOUT Analog Integrated Circuit Device Data Freescale Semiconductor 100% 90% 80% 70% 60% 50% 40% 30% 20% 10 500 600 100% 90% 80% 70% 60% 50% 40% 30% 20% 10 500 600 100% 90% ...

Page 28

... UVLO falling threshold, all of the outputs will be disabled without honouring the power down sequence This is to guarantee that the outputs are off and battery is not depleted further. 2 “I C User Interface” with a default of 1sec) Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 29

... C interface • If the device is off and a falling edge is detected at the ONOFF pin, the device starts up Analog Integrated Circuit Device Data Freescale Semiconductor The switching frequency will be selectable for all of the regulators. REG6, 7 & 8 switching frequency (F selectable through I in 250 kHz steps. The rest of the regulators switching ...

Page 30

... I event happened. Response B: The output will not switch off. Rather the 34704 communicates to the processor that an over-voltage/ under-voltage condition has occurred and wait for the Shutdown if No Processor Communication 2 C that such an Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 31

... REG5 is independently controlled (Default) REG6 and REG7 ramp up together. Analog Integrated Circuit Device Data Freescale Semiconductor The OV/UV fault flag is masked during DVS until DVSSTAT flag is asserted “Done”. To keep the RST output low during ramp up and until the soft start is done, the OV/UV protection is masked from reporting that the output is in regulation ...

Page 32

... GRPC/E DISABLED REG5, REG6 and REG7 ramp down together REG5, REG6, and REG7 ramp down together REG7 ramps down first. Then REG5 and REG6 ramp down together OV/UV Response bit A (Default Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 33

... REG1. Then, the SSSET bits for REG5 through REG8 can be used to change the soft start value for these regulators from the value set by the SSTIME. Analog Integrated Circuit Device Data Freescale Semiconductor Here is how the SSTIME bits interacts with the SSSETx register bits: LSB 1 ...

Page 34

... REG1 to REG8. bit 0 1 Thermal Shutdown Fault Register DVS STATUS bit DVS Not Done 0 DVS Done 1 ILIMF bit False 0 True 1 SCF bit False 0 True 1 OVF bit False 0 True 1 UVF bit False 0 True 1 Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 35

... OVUVSET2 REG2SET1 $06 R/W Analog Integrated Circuit Device Data Freescale Semiconductor REG7 Independent ON/OFF Control (Only on 34704A) The 34704B provide two register to independently turn on REG7 when REG6 is not needed. Care must be taken when turning on REG7 to avoid inrush currents during regulator ramp-up. Following Process must be followed to assure bit successful turn on of REG7 ...

Page 36

... REG3 DAC reference voltage configuration for Fine voltage Scaling 3DACx 7:0 Discharge enable for independent REG7 Control 4 Output Enable bits for Independent REG7 Control EN 7:6 REG7 DAC refence voltage configuration for REG7 Control 7DACx 7:0 Description Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 37

... EN[1:0] $59 REG7DAC 7DAC7 Analog Integrated Circuit Device Data Freescale Semiconductor There are also the IC general use registers. Those registers are also split between status reporting registers and processor programmable registers. This distribution keeps each regulator’s registers bundled together which makes it easier for the user to access one regulator at a time ...

Page 38

... OVF1 - OVUVSET2 UVF2 OVF2 DVSSTAT2 OVUVSET3 UVF3 OVF3 DVSSTAT3 OVUVSET4 UVF4 OVF4 DVSSTAT4 OVUVSET5 SSSET5[1:0] UVF5 OVF5 DVSSTAT5 - OVUVSET8 REG8MODE SSSET8[1:0] UVF8 OVF8 DVSSTAT8 FLT3 FLT2 FLT1 ACCURATE DAC2 DAC1 DAC0 - 7DAC2 7DAC1 7DAC0 Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 39

... RF2 GND Initially at power up, the soft start time will be set for all of the regulators through programming the SS pin with an external resistor divider connected between VDDI and AGND as follows: Analog Integrated Circuit Device Data Freescale Semiconductor COMPONENT CALCULATION , use a 2 SW1 F SW1 I max = 100μ ...

Page 40

... Input voltage Vo Operation range 3.0 - 4.2 Buck 2.7 - 3.0 Boost 3.5 - 4.2 Buck 2.7 - 4.2 Buck 2.7 - 4.2 Buck 2.7 - 3.0 Boost 3.5 - 4.2 Buck )D′ min Vo ≈ D′ T -------------- MAX [H] Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 41

... Analog Integrated Circuit Device Data Freescale Semiconductor • R1 and RB: These two resistors help to set the output voltage to the desire value using a Vref=0.6 V, select R1 between 10 k and 100 K and then calculate RB as follows: ...

Page 42

... R2 = ----------------------------- - ⎝ ⎠ 2π ⎛ ⎞ ----------------------------- - ⎝ ⎠ 2π ⎛ ⎞ ----------------------------- - ⎝ ⎠ 2π the 34704 V is half of 1.2 V since each operation mode spends only half the ramp. RAMP 34704 1. ---------- - 2 ⎞ ⎠ Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 43

... OB 1 – D max • R1 and RB: These two resistors help to set the output voltage to the desire value using a Vref=0.6V, select R1 between 10k and 100K and then calculate RB as follows: Analog Integrated Circuit Device Data Freescale Semiconductor ----------------------- - Vo – 1 ------------- - V REF • Compensation network. (C1,C2,C3, R2, R3) ...

Page 44

... REG8 is a Synchronous Boost converter set to 15V with a maximum current and can be used with voltage dtI max Vo max is the maximum allowed transient VO max Δ Fsw [Ω ------------------------------------- - ( ) Vo 1 – D min Δ and VO R =0.6 V, select R1 REF [Ω] R1 – 1 Analog Integrated Circuit Device Data Freescale Semiconductor [F] Δ VO max ...

Page 45

... RS (For current feedback control with LED string): This resistor is attached at the end of the LED string and it Analog Integrated Circuit Device Data Freescale Semiconductor controls the amount of current flowing through it. To calculate this resistor, set the maximum current you want to flow though the string and use the following formula: ...

Page 46

... The following poles and zeroes frequencies are provided by the type 3 compensation: [Ω ESR ): LC min OUT is the minimum off time percentage given by: min min max 1 ( )ESR OUT min LOAD • D 2πL as much 0. 1. ----------- 2P 2 Analog Integrated Circuit Device Data Freescale Semiconductor [Hz] [Hz] [Hz] [Hz] ...

Page 47

... Z1 1 ⎛ ⎞ ----------------------------- - ⎝ ⎠ 2π ⎛ ⎞ ----------------------------- - ⎝ ⎠ 2π the 34704 V is half of 1.2 V since each operation mode spends only half the ramp. RAMP Analog Integrated Circuit Device Data Freescale Semiconductor ⎞ ⎠ FUNCTIONAL DEVICE OPERATION COMPONENT CALCULATION 34704 47 ...

Page 48

... SW1 BT1 BT2D VIN PVIN2 SW2D VOUT2 V2 SW2U BT2U FB2 COMP2 BT3 VIN PVIN3 SW3 VOUT3 V3 FB3 VIN BT4D PVIN4 SW4D VOUT4 V4 SW4U BT4U FB4 COMP4 VIN ONOFF VIN VDDI VIN FREQ SS PGND (EXPAD) Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 49

... VIN PGND (EXPAD) Notes 20. AGND(S) & PGND(S) SHOULD BE CONNECTED TOGETHER AS CLOSE TO THE IC AS POSSIBLE 21. REFER TO THE FB8 FUNCTIONAL PIN DESCRIPTION ON PAGE 17. Figure 11. 34704B Typical Application Diagram Analog Integrated Circuit Device Data Freescale Semiconductor 34704B VG REG8 REG2 REG5 REG3 REG4 (20) TYPICAL APPLICATIONS ...

Page 50

... PACKAGING PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below. 34704 50 PACKAGING PACKAGE DIMENSIONS EP SUFFIX 56-PIN 98ASA10751D REVISION A Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 51

... Analog Integrated Circuit Device Data Freescale Semiconductor PACKAGE DIMENSIONS (CONTINUED) EP SUFFIX 56-PIN 98ASA10751D REVISION A PACKAGING PACKAGE DIMENSIONS (CONTINUED) 34704 51 ...

Page 52

... PACKAGING PACKAGE DIMENSIONS (CONTINUED) 34704 52 PACKAGE DIMENSIONS (CONTINUED) EP SUFFIX 56-PIN 98ASA10751D REVISION A Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 53

... Removed Li-ion battery references throughout document. • Added Feedback Reference Voltage and Feedback Reference Voltage on Current Regulation Mode to Table 4. Analog Integrated Circuit Device Data Freescale Semiconductor REVISION HISTORY 34704 Simplified Application Diagram on page 1 34704 Internal Block Diagram on page 3 34704 Pin Definitions on page 4 ...

Page 54

... Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended ...

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