Freescale MC34676 Dual 28 v input voltage charger with linear regulator Datasheet

Freescale Semiconductor
Advance Information
Document Number: MC34676
Rev. 1.0, 10/2008
Dual 28 V Input Voltage Charger
with Linear Regulator
34676
The 34676 is a dual 28 V input voltage and fully-integrated single
cell Li-Ion battery charger, targeting smart handheld applications. One
of the inputs is optimized for charging with a USB port, and the second
is optimized for an AC/DC adapter power source. The charger has two
28 V power devices, to eliminate the need of any external power
source selection and input over-voltage protection circuitry. Each of the
power devices independently controls the charge current from the
input, and performs as an independent charger. Only one of the two
chargers operate at a time.
The AC charger current and the USB charger current are
programmable, up to 1.2 A and 400 mA, with an external resistor
respectively. The voltage across the two external resistors is also used
to monitor the actual charge current through each charger respectively.
The EOC current of both chargers is the same, and programmable by
an external resistor. The 4.85 V regulator can be used to power a subsystem directly.
The 34676 has a 5% constant current accuracy for the AC Charger
over -40 to 85oC, and a 1.0% constant voltage accuracy over -40 to
85oC. A charge current thermal foldback feature, limits the charge
current when the IC internal temperature rises to a preset threshold.
Features
BATTERY CHARGER
EP SUFFIX (PB-FREE)
98ASA10814D
12-PIN µDFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34676BEP/R2
-40°C to 85°C
12-UDFN
Applications
• ±1.0% voltage accuracy over -45 to 85°C
• No external MOSFET, reverse blocking diode, or
current sense resistor are required
• Additional voltage regulated output powered by USB
input
• Battery detection input
• Charge current monitor with thermal limits
• Integrated input over-voltage protection
• Pb-free packaging designated by suffix code EP
•
•
•
•
•
Cell Phone
Smart Phone
PDA, PMP, PND,
Handheld Portable Devices
Portable Medical Devices
34676B
BAT
BATDET
USBOUT
AC
C1
USB
C2
GND
IMIN
IUSB
VDDIO
PPR
ISET
C4
C3
USBEN CHG
MCU
RIMIN
RIUSB RISET
USB
AC
Figure 1. 34676B 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., 2008. All rights reserved.
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
USBOUT
AC
BAT
USB
VAC
Mon
VUSB
Mon
VAC VBAT
Analog Control
VBAT VUSB
VREF
Temp
Sense
VOS
VOS
TKL
VBAT
VTKL
PPR
RCH
VBAT
VRCH
Logic
CHG
EOC
VEOC
IBAT/K
1.75 V
OSC
USBEN
IBATDET
BATDET
IMIN
ISET IUSB
GND
Figure 2. 34676 Simplified Internal Block Diagram
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Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
PIN CONNECTIONS
Transparent
Top View
AC
USB
PPR
CHG
USBEN
IMIN
EPAD
BATDET
BAT
USBOUT
ISET
GND
IUSB
Figure 3. 34676 Pin Connections
Table 1. 34676 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 14.
Pin Number
Pin Name
Pin Function
Formal Name
Definition
1
AC
Input
AC Input Supply
2
USB
Input
USB Input Supply
3
PPR
Output
Power Present
Indicator
Open-drain output to indicate the input power status.
4
CHG
Output
Charge Status
Indicator
Open-drain output to indicate the charge status.
5
USBEN
Input
Charger Selection
6
IMIN
Output
End-of-charge Current
Setting
End-of-charge (EOC) current setting.
7
IUSB
Output
USB Charger CCmode Current Setting
and Charger Current
Monitor
USB charger CC-mode current setting and charge current monitoring.
8
GND
N/A
Ground
9
ISET
Output
AC Charger CC-mode
Current Setting and
Charge Current
Monitor
10
USBOUT
Output
USB Regulator Output The USB input 4.85 V linear regulator with 45 mA current output
capability.
11
BAT
Output
Charger Output
12
BATDET
Input
Battery Detection
EPAD
EPAD
N/A
Thermal Enhanced
PAD
Power input from an AC/DC adapter.
Power input from a USB port.
Logic input. Low logic voltage selects the AC charger; high logic voltage
selects the USB charger.
Ground.
AC charger CC-mode current setting and charge current monitoring.
Charger output. Connect this pin to the battery.
Battery connection status detection.
The exposed pad for thermal dissipation enhancement. Must be soldered
on the large ground plane on the PCB to increase the thermal dissipation.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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
Symbol
Value
Unit
VAC, VUSB
-0.3 to 28
V
VPPR, VCHG
-0.3 to 12
V
VBAT, VBATDET,
VUSBEN,
VUSBOUT,
VISET, VIUSB,
VIMIN
-0.3 to 5.5
V
ELECTRICAL RATINGS
Input Supply Voltage Pins
Charge State Indication Pins
BAT, BATDET, USBEN, USBOUT, ISET, IUSB, IMIN Pins
ESD Voltage(1)
VESD
V
Human Body Model (HBM)
±2000
Machine Model (MM)
±200
THERMAL RATINGS
Operating Ambient Temperature Range
Storage Temperature Range
Peak Package Reflow Temperature During
Maximum Junction Temperature
Reflow(2), (3)
TA
-40 to +85
°C
TSTG
-65 to +150
°C
TPPRT
Note 3
°C
TJ
+150
°C
RθJC
24
°C/W
RθJA
90
(4)
Thermal Resistance
Junction-to-Case
Junction-to-Ambient
Notes
1. ESD testing is performed in accordance with the Human Body Model (HBM) (CZAP = 100 pF, RZAP = 1500 Ω), and the Machine Model
(MM) (CZAP = 200 pF, RZAP = 0 Ω).
2.
3.
4.
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.
Device mounted on the Freescale EVB test board per JEDEC DESD51-2.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics
Characteristics noted under conditions VAC = VUSB = 5.0 V, -40°C ≤ TA ≤ 85°C, C1 = C2 = C4 = 1.0 μF and C3 = 0.1 μF (See
Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VAC = VUSB = 5.0 V and
TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Rising
3.0
-
3.9
Falling
-
2.8
-
Rising
3.0
-
3.9
Falling
-
2.8
-
Rising
-
-
60
Falling
3.0
-
-
Unit
POWER-ON RESET (POR)
AC POR Threshold
USB POR Threshold
VPORAC
V
VPORUSB
V
INPUT-BAT OFFSET VOLTAGE (VOS)
AC Input-BAT Offset Voltage Threshold
USB Input-BAT Offset Voltage Threshold
VOSAC
mV
VOSUSB
mV
Rising
-
-
60
Falling
3.0
-
-
Rising
6.6
6.8
7.0
Falling
6.3
-
-
-
200
-
Rising
5.65
5.85
6.1
Falling
5.55
-
-
-
60
-
mV
-
-
1.0
μA
INPUT OVER-VOLTAGE PROTECTION (OVP)
AC Input Over-voltage Threshold
VOVPAC
V
AC Input Over-voltage Rising Threshold Hysteresis
USB Input Over Voltage Threshold
VOVPUSB
mV
V
USB Input Over-voltage Rising Threshold Hysteresis
STANDBY CURRENT
BAT Pin Sink Current
ISTDBY
Input not powered
AC Pin Input Supply Current
IACS
Charger disabled
-
-
750
μA
Charger enabled(5)
-
1.2
-
mA
USB Pin Input Supply Current
IUSBS
Charger disabled
-
-
750
μA
Charger enabled(5)
-
1.2
-
mA
Notes
5. Supply current does not include the current delivered to the battery through the BAT pin.
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions VAC = VUSB = 5.0 V, -40°C ≤ TA ≤ 85°C, C1 = C2 = C4 = 1.0 μF and C3 = 0.1 μF (See
Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VAC = VUSB = 5.0 V and
TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
IBAT = 10 mA, TA = 25°C
4.184
4.20
4.216
IBAT = 10 mA, TA = -40 to 85°C
4.158
4.20
4.242
Unit
VOLTAGE REGULATION
Regulated Output Voltage
VBAT
V
AC Charger Power MOSFET ON Resistance (VBAT = 4.0 V, IBAT =
500 mA, RISET = 3.75 kΩ)
RDS(ON)AC
-
-
500
mΩ
USB Charger Power MOSFET ON Resistance (VBAT = 4.0 V, IBAT =
300 mA, IUSB is floating)
RDS(ON)USB
-
-
1000
mΩ
IAC
0.1
-
1.2
A
CHARGE CURRENT
AC Charger CC-mode Current Range
AC Charger CC-mode Current Accuracy
IAC
When set current between 300 mA to 1.2 A
95%
100%
105%
When set current between 100 to 300 mA(6)
90%
100%
110%
USB Charger CC-mode Current Range
IUSB
When IUSB is floating
When IUSB is pulled down to ground with a resistor
USB Charger CC-mode Current Accuracy
mA
-
400
-
100
-
400
85%
100%
115%
IUSB
AC Trickle Charge Current (% of programmed CC current)
ITRKLAC
16%
20%
24%
IAC
USB Trickle Charge Current (% of programmed CC current)
ITRKLUSB
16%
20%
24%
IUSB
When RIMIN = 200 kΩ
5.5
10
12.3
When RIMIN = 25 kΩ
60
80
98
SR
20
-
120
mA/μs
ISET Voltage for IAC Reference
VISET
-
1.0
-
V
IUSB Voltage for IUSB Reference
VIUSB
-
1.0
-
V
IMIN Voltage for IEOC Reference
VIMIN
-
0.5
-
V
VRECH
4.05
4.10
4.15
V
VRECHHYS
-
25
-
mV
VTRK
2.5
2.7
2.8
V
VTRKHYS
-
100
-
mV
TLM
95
110
125
°C
End-of-Charge Threshold
Current Slew Rate (On both rising and transitions)
IEOC
mA
CHARGE THRESHOLD
Recharge Voltage Threshold
Recharge Voltage Threshold Hysteresis
Trickle Charge Threshold
Trickle Charge Threshold Hysteresis
CHARGE CURRENT THERMAL FOLDBACK
Current Foldback Die Temperature Limit
Notes
6. Not tested but guaranteed by design.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions VAC = VUSB = 5.0 V, -40°C ≤ TA ≤ 85°C, C1 = C2 = C4 = 1.0 μF and C3 = 0.1 μF (See
Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VAC = VUSB = 5.0 V and
TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
4.63
4.85
5.0
-
-
250
46
-
-
mA
-
200
-
kΩ
USBOUT REGULATOR
Output Voltage
VUSBOUT
VUSB=5.35 V, IUSBOUT=10 mA
V
Dropout Voltage
mV
At 45 mA output current
Output Current Limit
Output Pull-down Resistance
BATTERY DETECTION INPUT
Internal Pull-up Current
IBATDET
2.0
4.0
6.0
μA
Comparator Falling Threshold
VBATDET
1.65
1.75
1.85
V
-
200
-
mV
Hysteresis
LOGIC INPUT AND OUTPUT
USBEN Input High
VIH
1.5
-
-
V
USBEN Input Low
VIL
-
-
0.5
V
-
-
5.0
μA
USBEN Internal Pull-down Current
Open-drain Output Low
10 mA sink current
PPR and CHG Leakage Current When the Output is High-impedance
V
-
-
0.6
-
-
1.0
μA
VCHG = VPPR = 5.0 V
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
7
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions VAC = VUSB = 5.0 V, -40°C ≤ TA ≤ 85°C, C1 = C2 = C4 = 1.0 μF and C3 = 0.1 μF (See
Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VAC = VUSB = 5.0 V and TA
= 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
tEOC
500
-
1000
ms
fOSC
42
50.0
54.5
kHz
END-OF-CHARGE
EOC Filtering Time
OSCILLTOR
Oscillation Frequency
ELECTRICAL PERFORMANCE CURVES
4
450
3
300
2
150
Charger Current
25
50
75
1
1.0
0.8
VISET (V)
Battery Voltage
Battery Voltage (V)
Charger Current (mA)
600
0
0
1.2
5
750
0.6
0.4
0.2
0.0
4.0
0
100 125 150 175
4.5
5.0
Charge Time ( min)
6.5
7.0
VBAT=3.7 V, RISET=5.22 kΩ, TA=25oC
3000
1.0
2500
RISET=26.7kΩ
RISET=5.22kΩ
0.8
2000
VISET (V)
AC Pin Supply Current ( μA)
6.0
Figure 6. VISET vs VAC
Figure 4. AC Charger Complete Charge Cycle
VAC=5.0 V, RISET=5.22 kΩ, 740mAh Battery, TA=25oC
Charger Enabled
1500
1000
500
0
5.5
Input Voltage (V)
4
5
6
Input Voltage (V)
Figure 5. AC Pin Supply Current vs VAC
IBAT=0 mA, TA=25oC
0.4
0.2
Charger Disabled
3
0.6
7
0.0
0
150
300
450
600
750
Charger Current (mA)
Figure 7. VISET vs AC Charger Charge Current
VAC=5.0 V, TA=25oC
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Analog Integrated Circuit Device Data
Freescale Semiconductor
750
4.24
RISET=5.22kΩ
4.22
600
4.20
VBAT (V)
Constant Charge Current (mA)
ELECTRICAL CHARACTERISTICS
ELECTRICAL PERFORMANCE CURVES
450
300
150
0
4.0
4.18
4.16
4.14
4.12
RISET=26.7kΩ
4.5
5.0
5.5
6.0
6.5
4.10
-40
7.0
-20
AC pin supply current ( μA)
Charge Current (mA)
600
450
300
RISET=5.22kΩ
RISET=26.7kΩ
2
3
4
5
1750
Charger Enabled
1500
1250
1000
750
500
Charger Disabled
250
0
-40
-20
0
20
40
60
80
o
Temperature ( C)
Figure 9. AC Charger Charge Current vs Battery Voltage
VAC=5.0 V, TA=25°C
Figure 12. AC Pin Supply Current vs TA
VAC=5.0 V, IBAT=0 mA
1.10
200
1.05
RISET=5.22kΩ
VISET ( V)
Trickle Charge Current (mA)
80
2000
Battery Voltage (V)
150
60
Figure 11. VBAT vs TA
VAC=5.0 V, IBAT=0 mA
750
1
40
Temperature ( C)
Figure 8. AC Charger CC Current vs VAC
VBAT=3.7 V, TA=25°C
0
0
20
o
Input Voltage (V)
150
0
100
1.00
0.95
50
RISET=26.7kΩ
0
4.0
4.5
5.0
5.5
6.0
6.5
7.0
Input Voltage (V)
Figure 10. AC Charger Trickle Charge Current vs VAC
VBAT=2.0 V, TA=25°C
0.90
-40
-20
0
20
40
60
80
o
Temperature ( C)
Figure 13. VISET vs TA
VAC=5.0 V, RISET=5.22 kΩ, VBAT=3.7 V
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
ELECTRICAL CHARACTERISTICS
ELECTRICAL PERFORMANCE CURVES
Charger Current (mA)
500
RDS(ON) ( mΩ)
400
350
300
250
-40
-20
0
20
40
60
5
400
Battery Voltage
300
3
200
2
Charger Current
100
0
0
80
1
50
o
900
RISET=5.22kΩ
600
450
300
0
-40
RISET=26.7kΩ
-20
0
20
40
60
80
2500
2000
1500
1000
Charger Enabled
500
0
Charger Disabled
3
4
IBAT=0 mA, TA=25oC
250
1.2
200
1.0
RISET=5.22kΩ
100
RISET=26.7kΩ
-20
0
20
40
6
Figure 18. USB Pin Supply Current vs VUSB
VIUSB (V)
Trickle Charge Current ( mA)
Figure 15. AC Charger CC Current vs TA
VAC=5.0 V, VBAT=3.7 V
0
-40
5
Input Voltage (V)
Temperature ( C)
50
0
200
3000
o
150
150
Figure 17. USB Charger Complete Charge Cycle
VUSB=5.0 V, RIUSB=6.52 kΩ, 740 mA Battery, TA=25oC
USB Pin Supply Current ( μA)
Constant Charge Current ( mA)
Figure 14. AC Charger RDS(ON) vs TA
VBAT=4.0 V, IAC=750 mA, IBAT=500 mA
150
100
Charge Time ( min)
Temperature ( C)
750
4
Battery Voltage (V)
450
60
80
o
Temperature ( C)
Figure 16. AC Charger Trickle Charge Current vs TA
VAC=5.0 V, VBAT=2.0 V
0.8
0.6
0.4
0.2
0.0
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Figure 19. VIUSB vs VUSB
VBAT=3.7 V, RIUSB=9.76 kΩ, TA=25oC
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Analog Integrated Circuit Device Data
Freescale Semiconductor
1.0
RIUSB=9.76kΩ
VIUSB (V)
0.8
0.6
0.4
0.2
0.0
0
50
100
150
200
250
300
Trickle Charge Current (mA)
ELECTRICAL CHARACTERISTICS
ELECTRICAL PERFORMANCE CURVES
200
150
IUSB pin is floating
100
RIUSB=9.76kΩ
50
0
4.0
4.5
Charger Current (mA)
6.0
Figure 23. USB Charger Trickle Charge Current vs VUSB
VBAT=2.0 V, TA=25°C
5.00
400
4.95
IUSB pin is floating
300
200
VUSBOUT (V)
Constant Charge Current (mA)
=25oC
RIUSB=9.76kΩ
100
0
4.0
4.90
4.85
4.80
4.75
4.5
5.0
5.5
4.70
0
6.0
10
30
40
50
Figure 24. VUSBOUT vs IUSBOUT
VUSB=5.0 V, TA=25°C
Figure 21. USB Charger CC Current vs VUSB
VBAT=3.7 V, TA=25°C
6.0
500
5.5
VUSBOUT (V)
IUSB pin is floating
400
300
200
RIUSB=9.76kΩ
100
0
0
20
IUSBOUT (mA)
Input Voltage (V)
Charge Current (mA)
5.5
Input Voltage (V)
Figure 20. VIUSB vs USB Charger Charge Current
VUSB=5.0 V, TA
5.0
5.0
4.5
4.0
3.5
1
2
3
4
5
Battery Voltage (V)
Figure 22. USB Charger Charge Current vs VBAT
VUSB=5.0 V, TA=25°C
3.0
3.0
3.5
4.0
4.5 5.0
VUSB (V)
5.5
6.0
Figure 25. VUSBOUT vs VUSB
IUSBOUT=0 mA, TA=25oC
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
ELECTRICAL CHARACTERISTICS
ELECTRICAL PERFORMANCE CURVES
900
4.24
850
4.22
800
RDS(ON) ( mΩ)
VBAT (V)
4.20
4.18
4.16
4.14
4.12
4.10
-40
750
700
650
600
550
-20
0
20
40
60
500
-40
80
-20
o
1500
1250
1000
Charger Disabled
500
250
0
20
40
60
80
Constant Charge Current ( mA)
USB Pin Supply Current ( μA)
Charger Enabled
-20
IUSB pin is floating
400
300
200
RIUSB=9.76kΩ
100
0
-40
-20
0.9
0.8
0.7
0.6
60
o
Temperature ( C)
Figure 28. VIUSB vs TA
VUSB=5.0 V, RIUSB=9.76 kΩ, VBAT=3.7 V
80
Trickle Charge Current ( mA)
VIUSB ( V)
1.0
40
40
60
80
Figure 30. USB Charger CC Current vs TA
VUSB=5.0 V, VBAT=3.7 V
1.1
20
20
Temperature ( C)
Figure 27. USB Pin Supply Current vs TA
VUSB=5.0 V, IBAT=0 mA
0
0
o
Temperature ( C)
-20
80
500
o
0.5
-40
60
Figure 29. USB Charger RDS(ON) vs TA
VBAT=4.0 V, IUSB=400 mA, IBAT=300 mA
2000
0
-40
40
Temperature ( C)
Figure 26. VBAT vs TA
VUSB=5.0 V, IBAT=0 mA
750
20
o
Temperature ( C)
1750
0
250
200
150
IUSB pin is floating
100
RIUSB=9.76kΩ
50
0
-40
-20
0
20
40
60
80
o
Temperature ( C)
Figure 31. USB Charger Trickle Current vs TA
VUSB=5.0 V, VBAT=2.0 V
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Analog Integrated Circuit Device Data
Freescale Semiconductor
4.84
IUSBOUT=0mA
VUSBOUT ( V)
4.82
IUSBOUT=50mA
4.80
4.78
4.76
-40
-20
0
20
40
60
80
Recharge Voltage Threshold ( V)
ELECTRICAL CHARACTERISTICS
ELECTRICAL PERFORMANCE CURVES
4.20
4.15
4.10
4.05
4.00
3.95
-40
-20
o
0.6
0.4
0.2
40
60
80
o
Temperature ( C)
Figure 33. BAT Pin Current vs TA
VBAT=4.2 V, Input Not Powered or Charger Disabled
End-of-charge Current ( mA)
BAT Pin Current ( μA)
0.8
20
60
80
Figure 34. Recharge Voltage Threshold vs TA
VAC=5.0 V or VUSB=5.0 V
1.0
0
40
Temperature ( C)
Figure 32. VUSBOUT vs TA
VUSB=5.0 V
-20
20
o
Temperature ( C)
0.0
-40
0
120
100
80
RIMIN=25kΩ
60
40
20
-40
-20
0
20
40
60
80
o
Temperature ( C)
Figure 35. End-of-charge Current vs TA
VAC=5.0 V or VUSB=5.0 V
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34676 is a dual 28 V input charger, with 4.85 V
regulated voltage output optimized for smart handheld
devices. Many smart handheld applications require frequent
data exchange between the device and the personal
computer via a USB port. It is convenient that the device
charges the Li-Ion battery by taking advantage of the 500 mA
output current from the USB port, while exchanging the data.
In the meantime, the handheld device also needs to be able
to charge at a faster rate, when using an AC/DC adapter with
higher than 500 mA output current capability. Such
applications require a charger that can select one of the two
power sources, and charge at a user desired current rate.
The 34676 is optimized for such applications.
The 34676 requires only four external capacitors and three
resistors to build a fully functional charger for space-limited
applications, such as PDAs, cell phones, and digital still
cameras. Its ultra high voltage accuracy (±0.4%) and
temperature limited charging current, offer additional battery
safety during charging.
Two external resistors, RIUSB and RISET, set the CC-mode
current of the USB charger and the CC-mode current of the
AC charger respectively. Both the USB charge current and
the AC charge current can be monitored during the whole
charge cycle, by measuring the voltage across RIUSB and
RISET. For a deeply discharged battery with a voltage lower
than 2.7 V, the charger preconditions the battery with 20% of
the corresponding CC-mode current. The end-of-charge
(EOC) current is set by an external resistor, RIMIN.
The linear regulator provides 4.85 V with 45 mA
(USBOUT) current capability. The output is turned on when
the voltage of the USB input power supply is above the POR
threshold but lower than the OVP threshold. The linear
regulator is independent. It is not related to any signals of the
charger including the enable input pin.
Two indication outputs (PPR, CHG) make it easy to report
the input power status and the charge status to MCUs or
users via LEDs.
FUNCTIONAL PIN DESCRIPTION
AC INPUT SUPPLY (AC)
END-OF-CHARGE CURRENT SETTING (IMIN)
Power input from an AC/DC adapter. Bypass to ground
with a 1.0 μF capacitor.
The end-of-charge current is set by connecting a resistor,
RIMIN, between this pin to ground. Both the AC charger and
the USB charger have the same EOC current value.
USB INPUT SUPPLY (USB)
Power input from a USB port. Bypass to ground with a
1.0 μF capacitor.
POWER PRESENT INDICATOR (PPR)
Open-drain output to indicate the input power status.
When both the AC and the USB input voltages are under the
power-on-reset threshold voltage, or above the over-voltage
protection threshold voltage, the PPR outputs a highimpedance. In any other conditions, the PPR outputs a low
voltage.
CHARGE STATUS INDICATOR (CHG)
Open-drain output to indicate the charge status. The
output is low when the 34676 is charging until the EOC
conditions are reached.
CHARGER SELECTION (USBEN)
Logic input. This pin selects the AC charger or the USB
charger. When driven to low, the AC charger is selected.
When driven to high, the USB charger is selected. This pin is
internally pulled to ground by a weak current source. The
input is equivalent to low when this pin is floating.
USB CHARGER CC-MODE CURRENT SETTING
AND CHARGE CURRENT MONITOR (IUSB)
The CC-mode current of the USB charger is set by
connecting a resistor, RIUSB, between this pin and ground.
When the USB charger is charging in the constant-current
mode, the voltage at this pin is 1.0 V. The voltage reduces
proportionally as the charge current reduces in the constantvoltage mode. During the whole charge cycle, the voltage at
this pin can be used to monitor the charge current using the
following equation:
V IUSB
I BAT = ---------------- ⋅ I USB
1.0V
equ.1
where IBAT is the actual charge current, VIUSB is the
voltage at the IUSB pin and IUSB is the CC-mode current of
the USB charger programmed by the RIUSB.
When this pin is floating, the CC-mode current of the USB
charger is set to a default value of 400 mA.
GROUND (GND)
Ground.
34676
14
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
AC CHARGER CC-MODE CURRENT SETTING AND
CHARGE CURRENT MONITOR (ISET)
The CC-mode current of the AC charger is set by
connecting a resistor, RISET, between this pin and ground.
When the AC charger is charging in the constant-current
mode, the voltage at this pin is 1.0 V. The voltage reduces
proportionally as the charge current reduces in the constantvoltage mode. During the whole charge cycle, the voltage at
this pin can be used to monitor the charge current using the
following equation:
V ISET
I BAT = --------------- ⋅ I AC
1.0V
equ.2
where IBAT is the actual charge current, VISET is the
voltage at the ISET pin and IAC is the CC-mode current of the
AC charger programmed by the RISET.
USB REGULATOR OUTPUT (USBOUT)
The USB regulator output pin. The USB linear regulator is
powered by the USB input. The output voltage is 4.85 V and
the output current capability is 45 mA. The USB regulator is
enabled when the USB input voltage is between the POR and
the OVP thresholds. Bypass to ground with a 0.1 μF or higher
capacitor.
CHARGER OUTPUT (BAT)
Charger output pin. Connect this pin to the battery being
charged. Bypass to ground with a 1.0μF or higher capacitor.
BATTERY DETECTION (BATDET)
Battery detection input. This input has a threshold of
1.75 V. When the input voltage is lower than the threshold,
the charger is enabled. An internal 4.0 μA pull-up current
source pulls the voltage higher than the threshold if this pin is
floating.
EXPOSED PAD (EPAD)
The exposed pad needs to be connected to GND. It must
be soldered on a large ground plane on the PCB to enhance
the thermal dissipation.
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34676 - Functional Block Diagram
Integrated Supply
Outputs
Internal Supply & Reference
Sensing & Control
Power MOSFET
VIN Monitor
Charge Control
Current Setting
End of Charge
Current Monitor
VIN - BAT Comparator
Die Temperature Feedback
Battery Detection
Linear Regulator
Logic
Logic Control & Status Indication
Integrated Supply
Sensing & Control
Logic
Outputs
Figure 36. 34676 Functional Internal Block Diagram
OUTPUTS
SENSING & CONTROL
POWER MOSFET
VIN MONITOR
The power MOSFET function contains two power
MOSFETs that pass the charging current from the inputs (AC
or USB) to the output (BAT).
The input voltage monitor block monitors the AC input and
the USB input voltages. If any input voltage is lower than its
POR or higher than its OVP threshold, this block outputs a
logic signal to disable the corresponding charger.
LINEAR REGULATOR
The linear regulator outputs a regulated 4.85 V from the
USB input voltage with 45 mA (USBOUT) current
capabilities. The regulator is only controlled by the power
supply input. It is not controlled by the enable input or any
other input signals. When the USB power supply input is
powered, the Input Voltage Monitor and the Internal Supply
blocks detect that the input voltage is greater than the POR
rising threshold, and lower than the OVP threshold, the
regulator is enabled and outputs 4.85 V.
INTEGRATED SUPPLY
INTERNAL SUPPLY & REFERENCE
This block steps down the high input voltage to a lower
voltage to power all the internal blocks.
VIN – BAT COMPARATOR
The input and battery voltage comparator monitors the
voltage difference between the input voltage and the battery
voltage. The input voltage has to be higher than the battery
voltage for the charger to be enabled. If the voltage of the AC
input or the USB input falls below the battery voltage, this
block outputs a signal to disable the corresponding charger
to prevent the leakage current from the battery to the input.
CHARGE CONTROL
The charge control block controls the gate voltage of the
power MOSFETs to regulate the charge current, the battery
voltage, or the die temperature. It can also completely turn off
the power MOSFETs to stop the current flow between the
input and the battery.
DIE TEMPERATURE SENSE
The die temperature sense block monitors the die
temperature. Once the die temperature reaches the
34676
16
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
threshold temperature, this block tries to reduce the charge
current to prevent further die temperature rise.
CHARGE CURRENT SETTING AND CURRENT
MONITOR
This block sets the CC-mode charge current and monitors
the actual charge current of both the AC charger and the USB
charger during the whole charge cycle.
END OF CHARGE (EOC) CURRENT SETTING
The EOC current setting block sets the EOC current of
both the AC charger and the USB charger.
BATTERY DETECTION
This block detects the connection status of the battery. It is
also an enable input for the 34676.
LOGIC
LOGIC CONTROL AND STATUS INDICATION
The logic control block determines the on and off of the
charger, based on the signals from the Input Voltage Monitor
block, the Internal Supply block, the Input and Battery
Voltage Comparator block, the charger selection pin, and the
external enable input pin.
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The 34676 uses the standard charge profile with trickle
mode, constant-current (CC) mode, and constant-voltage
(CV) mode, as shown in Figure 37. Both the CC-mode and
the CV-mode are called fast charge mode. Figure 40 shows
the complete charge cycle state diagram.
When the input voltage rises above the internal power-onreset threshold and is less than its OVP threshold, the PPR
pin outputs a logic low level to indicate the power supply
presence. The charger starts to verify the enable input
(BATDET input). If it is enabled, the charger will start with the
trickle mode until the battery voltage is above 2.7 V. The
CHG pin turns to logic low level at the beginning of the trickle
mode. If the battery voltage is unable to rise due to a battery
failure, the charging will remain in the trickle-charge mode.
When the battery voltage reaches the 2.7 V threshold, the
34676 softly changes to the CC-mode. The soft transition
minimizes the input voltage drop and reduces the
requirement of the input decoupling capacitance. When the
battery voltage reaches 4.2 V, the 34676 enters the CVmode and regulates the output voltage at 4.2 V. The charge
current decreases gradually in the CV-mode. When the
current drops to the EOC current threshold, the 34676
outputs a logic high level at the CHG pin, to indicate that the
charger has entered into the charge completion mode.
After the charge is completed, the 34676 continues to
regulate the output to 4.2 V. If a load is in parallel with the
battery, the charger continues to output the current to the
load even the charge is completed. When the battery voltage
is below the recharge voltage threshold of 4.10 V, the 34676
returns to the fast charge mode and indicates a low signal at
the CHG pin.
When one of the following conditions happen, the chargers
stop charging and enter disable mode.
1. VIN > VOVP
2. VIN -VBAT < VOS
3. The voltage at BATDET pin is higher than 1.75 V
where VIN can be either the AC or the USB input voltage.
.
Trickle Constant Current
Constant Voltage
Charge
Voltage
100mV
Charge
Current
ITRKL
IEOC
TIME
CHG
TIME
Figure 37. Typical Charge Cycle
34676
18
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
DETAILED FUNCTIONAL DEVICE OPERATION
DC 28V INPUT
AC CHARGE CURRENT SETTING
The 34676 consists of two power MOSFETs, as shown in
Figure 38, that act as power source selection devices and
pass the charge current from input to output. Both inputs are
capable of withstanding up to 28 V DC input. The charger
only charges when the input voltage is in a power-good
range.
An external reference resistor between the ISET pin and
ground sets the CC-mode charge current of the AC charger
by the following equation:
3950
equ.3
I AC = --------------R ISET
AC
USB
BAT
Analog Control
Figure 38. Dual Internal Power MOSFETs
The input voltage is defined as being in a power-good
range when satisfying all following three conditions:
1. VIN > VPOR
2. VIN -VBAT > VOS
3. VIN < VOVP
where VIN can be either the AC or the USB input voltage.
Only one of the two inputs is selected as the power source
to charge the battery at a time. The AC input is selected if the
USBEN voltage is a low logic level, and the USB input is
selected when the USBEN voltage is high logic level.
DC INPUT INDICATOR
The 34676 uses PPR pin to indicate the DC input power
presence. When both the AC and the USB input voltages are
under the power-on-reset threshold voltage, or above the
over-voltage protection threshold voltage, the PPR outputs
high-impedance. In any other conditions, the PPR outputs
low voltage. The PPR output is only controlled by the input
voltage. All other functions, such as the enable signal and the
Input-and-Battery-Voltage Comparator, do not affect the PPR
output.
where RISET is the resistance between the ISET pin and
ground. In addition, the current out of the ISET pin is also
proportional to the charge current. The system may measure
the ISET pin voltage to monitor the actual charge current, as
given in equ.2, during the whole charging cycle.
USB CHARGE CURRENT SETTING
An external reference resistor between the IUSB pin and
ground sets the CC-mode charge current of the USB charger
by the following equation:
1975
equ.4
I USB = --------------R IUSB
where RIUSB is the resistance between the IUSB pin and
ground. In addition, the current out of the IUSB pin is also
proportional to the charge current. The system may measure
the IUSB pin voltage to monitor the actual charge current, as
given in equ.1, during the whole charging cycle.
CHARGE CURRENT LIMIT
The charge current is limited by multiple factors.
When the voltage difference between the input and the
battery (VAC -VBAT or VUSB -VBAT) is low, (VAC -VBAT)/
RDS(ON)AC or (VUSB -VBAT)/RDS(ON)USB may be less than the
corresponding programmed CC-mode current. The charge
current is, in this case, limited by (VAC -VBAT)/RDS(ON)AC or
(VUSB -VBAT)/RDS(ON)USB.
When the voltage difference between the input and the
battery is too high, the large power dissipation may lead to
the thermal-foldback operation due to the die-temperature
regulation. The charge current is reduced to prevent further
temperature rise (See the Thermal current foldback section
for more information).
OVER-VOLTAGE PROTECTION (OVP)
Both the USB charger and the AC charger have an OVP
threshold as specified in the Static Electrical Characteristics
table. When an input voltage is higher than its OVP threshold,
the input voltage does not meet the power-good condition,
and cannot be selected as the input power source. However,
the other input power source may still be in the power-good
range and charge the battery. The PPR pin outputs highimpedance if both inputs are above its OVP threshold.
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
INPUT AND BATTERY VOLTAGE COMPARATOR
LIVE SWITCHING BETWEEN CHARGERS
The input and battery voltage comparator monitors the
voltage difference between the input voltage and the battery
voltage, as shown in Figure 2. The input voltage has to be
higher than the battery voltage, for the charger to be enabled.
If the input voltage falls below the battery voltage, this block
outputs a signal to disable the charger, to prevent the leakage
current from the battery to the input. Due to the intrinsic input
offset voltage of the comparators, a small positive voltage,
VOS, is added. Thus the power MOSFET can be turned on
only when the input voltage is higher than the battery voltage
by VOS. On the other hand, the added VOS guarantees that
the power MOSFET is turned off when the input voltage is
lower than the battery voltage.
When switching from one charger to the other in the
middle of a charge cycle, the newly turned on charger will
start a new charge cycle. When both the AC and the USB
inputs are powered, switching the USBEN signal from low to
high will force the charging to switch from the AC charger to
the USB charger, and switching the USBEN signal from high
to low will force the charging to switch form the USB charger
to the AC charger. Every time when the switching happens, a
new charge cycle will be initialized.
CHARGER SELECTION INPUT
The USBEN selects either the AC or the USB charger.
When the USBEN is driven to a low logic level, the AC
charger is selected. When the USBEN is driven to a highlogic level, the USB charger is selected. The USBEN is
internally pulled low by a weak current source.
BATTERY DETECTION INPUT
The battery detection input, BATDET, detects the
connection of the battery, and is an enable input for the
charger. The BATDET comparator has a threshold of 1.75 V
(typical). When this pin is driven below this threshold, the
charger is enabled. When driven higher than the 1.75 V
threshold, the charger is disabled. The BATDET pin is
internally pulled up by a 4.0 μA current source. The BATDET
input does not affect the PPR signal.
THERMAL CURRENT FOLDBACK
An internal thermal feedback loop begins to reduce the
charge current when the die temperature reaches 110oC, to
prevent further temperature rise. This feature protects the
34676 from over-temperature failure, and allows the user to
push the limits of the power handling capability of a given
circuit board, without the risk of damaging the 34676. The
charge current can be set according to the typical (not the
worst case) ambient temperature, with the assurance that the
charger will automatically reduce the current in worst-case
conditions.
REGULATED OUTPUT
The 34676 has one regulated output, USBOUT.
The USBOUT is powered by the USB input. Its regulated
output voltage is 4.85 V. When the USB input voltage is
below the rising POR threshold, or higher than the OVP
threshold, the USBOUT output voltage is zero volts. When
the USB input voltage is above the rising POR threshold, and
before the linear regulator enters regulation, the output tracks
the input voltage with a possible dropout voltage, caused by
the on resistance of the pass switch. When the input voltage
is higher than the 4.85 V, but lower than the OVP threshold,
the output is regulated to 4.85 V. The waveform of the
voltage-regulated output vs. the input voltage is summarized
in Figure 39.
VUSB
VOVPR
VPORR
VOVPF
4.85V
VUSBOUT
VPORF
Figure 39. Voltage Regulated Output vs. Input Voltage
The regulated output is only controlled by the input
voltage, and independent on the enable or the other inputs.
When the USB input is powered, the USBOUT will output
4.85 V.
34676
20
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
STATE DIAGRAM
Both AC and
USB inputs below
POR threshold
PWR OFF
Charger: OFF
PPR: H
VUSB > VPOR or
VAC > VPOR
Not
Enabled
Anytime charger
disabled
EN
VERIFICATION
Charger: OFF
PPR: L
OV fault removed
Power good
POR
Charger: OFF
PPR: L
Enabled
TRICKLE
CHARGE
OV FAULT
Charger: OFF
PPR: H
CHG: H
Charger: ON
PPR: L
CHG: L
VBAT > VTRK
Anytime an OV Fault
occurs
VBAT drops
below VTRK
FAST CHARGE
Charger: ON
PPR: L
CHG: L
VBAT > VRCH
and IBAT < IEOC
VBAT < VRCH
CHARGE
COMPLETE
Charger: ON
PPR: L
CHG: H
Figure 40. Charge Cycle State Diagram
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
TYPICAL APPLICATIONS
APPLICATION INFORMATION
TYPICAL APPLICATIONS
APPLICATION INFORMATION
INPUT CAPACITOR
THERMAL CONSIDERATIONS
The input capacitor is used to minimize the input voltage
transient that may cause instability when the input voltage is
near VBAT+VOS. Typically a 1.0 µF X5R ceramic capacitor is
sufficient for most applications.
The 34676 is available in a 3x3 thermally-enhanced UDFN
package. A careful thermal design must be considered. The
thermal pad needs to be well soldered to a large copper
ground plane on the component layer. If the component layer
is space limited and does not allow a large copper plane, the
thermal pad needs to be connected to other layers through a
via array. This increases the actual charge current capability
of the 34676.
OUTPUT CAPACITOR
For stable operation, an X5R ceramic capacitor of 1.0µF
minimum value is needed in parallel with the battery.
Depending on the load transient current, a larger capacitance
may be required.
DUAL-INPUT CHARGER
Figure 41 shows a typical application using the 34676. C1
and C2 are typically 1.0 μF/X5R/16 V ceramic capacitors. C3
is a typically a 0.1 μF/X5R/6.3 V ceramic capacitor. C4
usually is a combination of multiple capacitors that are
connected to the BAT bus. The charger will be stable with a
minimum of a 1.0 μF/X5R/6.3 V ceramic capacitor when a
battery is connected. When no battery is connected, a
minimum of a 10 mA load current is required for the charger
output to be stable in CV phase. All connections to the MCU
are optional. The voltage output of the ISET and the IUSB pin
can be monitored by an analog-to-digital input of the MCU, for
charge current measurement. The USBEN pin requires no
pull-up resistors.
The MCU can choose the AC charger or the USB charger,
by controlling the USBEN pin voltage. Since the BATDET
sources 6.0 μA (maximum) of current and has a 1.65 V
(minimum) battery detection threshold, a pull-down resistor
less than 275 kΩ should be attached at BATDET, to enable
the charger. If the battery pack doesn’t have an ID resistor
inside, an external resistor is required.
CC-MODE CURRENT SETTING
The CC-mode current of the USB charger, or the AC
charger, can be set by external resistors, RIUSB and RISET. A
1% accuracy resistor is recommended to guarantee 5% and
15% CC-mode current accuracy for the AC charger and the
USB charger respectively.
EOC CURRENT SETTING
The EOC current can be set by the external resistor, RIMIN.
A 1% accuracy resistor is recommended to guarantee the
EOC current accuracy.
DROPOUT VOLTAGE
If the input voltage is too low, it may not maintain the
programmed CC-mode current, due to the voltage dropout
over the power MOSFET. The worst case of RDS(ON) is
500 mΩ for the AC charger and 1000 mΩ for the USB
charger. The input voltage should be higher than VBAT + IAC
x 500 mΩ for the AC charger, and VBAT + IUSB x 1000 mΩ for
the USB charger, to guarantee the programmed CC-mode
current.
MC34676B
BAT
BATDET
USBOUT
AC
C1
USB
C2
GND
IMIN
IUSB
C3
VDDIO
PPR
ISET
C4
USBEN CHG
MCU
RIMIN
RIUSB RISET
USB
AC
Figure 41. Dual-input Charger of the MC34676
34676
22
Analog Integrated Circuit Device Data
Freescale Semiconductor
TYPICAL APPLICATIONS
PACKAGE DIMENSIONS
PACKAGE DIMENSIONS
For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below.
EP SUFFIX
12-PIN
98ASA10814D
REVISION 0
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
TYPICAL APPLICATIONS
PACKAGE DIMENSIONS
EP SUFFIX
12-PIN
98ASA10814D
REVISION 0
34676
24
Analog Integrated Circuit Device Data
Freescale Semiconductor
TYPICAL APPLICATIONS
PACKAGE DIMENSIONS
EP SUFFIX
12-PIN
98ASA10814D
REVISION 0
34676
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
REVISION HISTORY
REVISION HISTORY
REVISION
1.0
DATE
10/2007
DESCRIPTION OF CHANGES
• Initial Release
34676
26
Analog Integrated Circuit Device Data
Freescale Semiconductor
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MC34676
Rev. 1.0
10/2008
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Semiconductor was negligent regarding the design or manufacture of the part.
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