Freescale Semiconductor
Technical Data
Document Number: MC34704
Rev. 4.0, 6/2009
Multiple Channel DC-DC Power
Management IC
The 34704 is a multi-channel Power Management IC (PMIC) used
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 5.5V) 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.
The 34704 is housed in a 7x7mm, Pb-free, QFN56 and is capable
of operating at a switching frequency of up to 2MHz. This makes it
possible to reduce external component size and to implement full
space efficient power management solutions.
34704
MULTI-CHANNEL IC
Features
• 8 DC/DC (34704A) or 5 DC/DC (34704B) switching regulators with
up to
±2%
output voltage accuracy
• Dynamic voltage scaling on all regulators.
• Selectable voltage mode control or current mode control on REG8
• I
2
C programmability
• Output under-voltage and over-voltage detection for each
regulator
• Over-current limit detection and short-circuit protection for each
regulator
• Thermal limit detection for each regulator, except REG7
• Integrated compensation for REG1, REG3, REG6, and REG8
• 5.0µA maximum shutdown current (All regulators are off, 5.5V VIN)
• True cutoff on all of the boost and buck-boost regulators
• Pb-free packaging designated by suffix code EP
EP SUFFIX (PB-FREE)
98ASA10751D
56-PIN QFN
ORDERING INFORMATION
Device
MC34704AEP/R2
MC34704BEP/R2
Temperature
Range (T
A
)
-20°C to 85°C
Package
56 QFN EP
34704A/B
REG 8
REG 4
V
BKL
V
DDR
I
2
C COMM
REG 3
REG 2
REG 5
PGND
*REG 1
*REG 6
*REG 7
V
CORE
V
IO1
V
IO2
DDR
MEMORY
GND
MPU
GND
LCD
+5V
VREF+ (5 to 16V)
VREF- (-5 to -9V)
* Available only in 34704A device
Figure 1. 34704 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., 2008 - 2009. All rights reserved.
Table 1. Device Variations
Orderable Part Number
MC34704AEP/R2
MC34704BEP/R2
No. of Regulators
8
5
Regulator Number
Reg 1 - 8
Reg 2, 3, 4, 5, 8
34704
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
REG8
voltage data
Control
voltage data
Control
REG1/VG
VOUT1 (34704A)
OUT8
L
SW8
VG
PreDrv
Boot
PWM
Start-Up
Ipeak-det
and blanking
SW control
Error Amp
Error Amp
PWM
P-skip
PreDrv
VG
SW1
VG
Boot
BT8
FB8
BT1
Error Amp
Control
Error Amp
PWM
PreDrv
Control
DRV7
FB7
PreDrv
OUT7
voltage data
voltage data
Boot
REG7 (34704A)
REG2
VG
BT2D
PVIN2
SW2D
VOUT2
Error Amp
PWM
P-skip
PreDrv
SW2U
VG
Amp
VREF7
COMP7
REG6 (34704A)
Boot
BT2U
COMP2
FB2
voltage data
Control
REG3
VG
Control
Boot
voltage data
VOUT6
L
SW6
VG
PreDrv
Boot
PWM
Error Amp
BT3
PVIN3
SW3
BT6
Error Amp
Error Amp
PWM
P-skip
PreDrv
VOUT3
FB3
VG
PreDrv Boot
FB6
VG
REG4
REG5
Boot PreDrv
voltage data
Control
voltage data
Control
BT4D
PVIN4
SW4D
VOUT4
BT5D
PVIN5
SW5D
VOUT5
Error Amp
Error Amp
PreDrv
PWM
P-skip
PreDrv
SW4U
VG
Boot
SW5U
VG
PWM
P-skip
BT4U
FB4
COMP4
Boot
BT5U
COMP5
FB5
VDDI
SCL
SDA
RST
VIN
AGND
VIN
VG
VDDI (2.5V) VDDIMON (VDDIdet)
I
2
C
Registers
To Reg 1-8
Reset Driver
Sequencer
OSC/Divider
UVLO
Detection
Startup Control
ONOFF
LION
FREQ
SS
PGND (EXPAD)
mux
Thermal
Detection
ADC
Soft Start
Figure 2. 34704 Internal Block Diagram
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
PIN CONNECTIONS
COMP5
COMP5
COMP2
COMP2
VOUT5
VOUT2
VOUT5
VOUT2
SW5D
SW5U
SW2U
SW2D
PVIN5
PVIN5
PVIN2
SW5D
SW5U
SW2U
SW2D
PVIN2
BT5D
BT5D
BT2D
BT2D
FB5
FB5
FB2
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
3
4
5
6
7
8
9
10
11
12
13
Exposed Pad
PGND
57
41
40
39
38
37
36
35
34
33
32
31
30
BT2U
ONOFF
LION
VDDI
VIN
AGND
VOUT6
SW6
BT6
FB6
VOUT7
DRV7
FB7
VREF7
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
3
4
5
6
7
8
9
10
11
12
13
Exposed Pad
PGND
57
41
40
39
38
37
36
35
34
33
32
31
30
FB2
BT2U
ONOFF
LION
VDDI
VIN
AGND
PGND5
PGND4
NC4
AGND3
PGND2
NC3
AGND1
NC2
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
SS
FREQ
VOUT8
VOUT1
SW8
SW1
SDA
FB8
BT8
VG
BT1
SCL
COMP7
RST
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
SS
FREQ
VOUT8
SW8
SW1
SDA
FB8
BT8
VG
BT1
SCL
NC0
RST
NC1
34704A
Figure 3. 34704 Pin Connections
Table 2. 34704 Pin Definitions
34704B
A functional description of each pin can be found in the Functional Pin Description section beginning on
page 17.
Pin Number Device Pin Name Pin Function
1
A/B
BT5U
Passive
Formal Name
REG5 Boost Stage
bootstrap capacitor input
pin
REG4 Buck Stage
bootstrap capacitor input
pin
REG4 power supply input
voltage
REG4 Buck Stage
switching node
REG4 regulated output
voltage pin
REG4 Boost Stage
switching node
REG4 Boost Stage
bootstrap capacitor input
pin
REG4 voltage feedback
input for voltage
regulation/programming
REG4 compensation
network connection
REG3 bootstrap capacitor
input pin
Definition
Connect a 1μF capacitor between this pin and SW5U pin to
enhance the gate of the Switch Power MOSFET.
Connect a 0.01μF capacitor between this pin and SW4D pin to
enhance the gate of the Switch Power MOSFET.
This is the connection to the drain of the high side switch FET.
Input decoupling /filtering is required for proper REG4 operation.
The inductor is connected between this pin and the SW4U pin.
Connect this pin to the load and to the output filter as close to
the pin as possible.
The inductor is connected between this pin and the SW4D pin.
Connect a 0.01μF capacitor between this pin and SW4U pin to
enhance the gate of the Switch Power MOSFET.
Connect the feedback resistor divider to this pin.
2
A/B
BT4D
Passive
3
4
5
6
7
A/B
A/B
A/B
A/B
A/B
PVIN4
SW4D
VOUT4
SW4U
BT4U
Power
Input/Output
Output
Input/Output
Passive
8
A/B
FB4
Input
9
10
A/B
A/B
COMP4
BT3
Passive
Passive
REG4 compensation network connection.
Connect a 0.01μF capacitor between this pin and SW3 pin to
enhance the gate of the Switch Power MOSFET.
34704
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
Table 2. 34704 Pin Definitions (continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on
page 17.
Pin Number Device Pin Name Pin Function
11
12
13
14
A/B
A/B
A/B
A/B
PVIN3
SW3
VOUT3
FB3
Power
Output
Output
Input
Formal Name
REG3 power supply input
voltage
REG3 switching node
REG3 output voltage
return pin
REG3 voltage feedback
input for voltage
regulation/programming
Soft start time
Definition
This is the connection to the drain of the high side switch FET.
Input decoupling /filtering is required for proper REG3 operation.
The inductor is connected between this pin and the regulated
REG3 output.
This is the discharge path of REG3 output voltage.
Connect the feedback resistor divider to this pin.
15
A/B
SS
Input
The soft start time for all regulators can be adjusted by
connecting this pin to an external resistor divider between VDDI
and AGND pins.
The oscillator frequency can be adjusted by connecting this pin
to an external resistor divider between VDDI and AGND pins.
This pin sets F
SW1
value.
Connect the feedback resistor divider to this pin.
16
A/B
FREQ
Input
Oscillator frequency
17
A/B
FB8
Input
REG8 voltage feedback
input for voltage
regulation/programming
REG8 bootstrap capacitor
input pin
REG8 regulated output
voltage pin
REG8 switching node
REG1 switching node
REG1 regulated output
voltage before the cutoff
switch
REG1 regulated output
voltage pin.
-
REG1 bootstrap capacitor
input pin
I
2
C serial interface clock
input
I
2
C serial interface data
input
Power reset output signal
(Microprocessor Reset)
REG7 compensation
network connection
-
18
19
20
21
22
A/B
A/B
A/B
A/B
A/B
BT8
VOUT8
SW8
SW1
VG
Passive
Output
Output
Output
Passive
Connect a 0.01μF capacitor between this pin and SW8 pin to
enhance the gate of the Synchronous Power MOSFET.
Connect this pin directly to the load directly and to the output
filter as close to the pin as possible.
The inductor is connected between this pin and VIN pin.
The inductor is connected between this pin and VIN Pin.
REG1 regulated output voltage before the cut-off switch. This
supplies the internal circuits and the gate drive
Connect this pin directly to the load directly and to the output
filter as close to the pin as possible.
Pin 23 is not connected.
Connect a 1μF capacitor between this pin and SW1 pin to
enhance the gate of the Switch Power MOSFET.
I
2
C serial interface clock input.
I
2
C serial interface data input.
This is an open drain output and must be pulled up by an
external resistor to a supply voltage like V
IN
.
REG7 compensation network connection.
Pin 28 is not connected
23
A
B
VOUT1
NC0
BT1
SCL
SDA
RST
COMP7
NC1
VREF7
NC2
Output
No Connect
Passive
Input/Output
Input/Output
Open Drain
Passive
No Connect
Output
No Connect
24
25
26
27
28
A/B
A/B
A/B
A/B
A
B
29
A
B
REG7 resistor feedback
Connect this pin to the bottom of the feedback resistor divider.
network reference voltage
-
Pin 29 is not connected
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
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