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PDF 34671 Data sheet ( Hoja de datos )
| Número de pieza | 34671 | |
| Descripción | High Input Voltage 600mA Charger | |
| Fabricantes | Freescale Semiconductor | |
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www.DFatraSeheesetc4Ua.lceomSemiconductor
Advance Information
Document Number: MC34671
Rev. 1.0, 01/2008
High Input Voltage 600mA
Charger for Single-cell Li-Ion
Batteries
34671
The MC34671 is a cost-effective fully-integrated battery charger for
Li-Ion or Li-Polymer batteries. The high input voltage, up to 28V,
eliminates the input over-voltage-protection circuit required in
handheld devices such as cell phones, Bluetooth accessories and MP3
players.
POWER MANAGEMENT IC
A typical charge cycle includes trickle, constant-current (CC) and
constant-voltage (CV) charge modes. The CC-mode current is
programmable up to 600mA with an external resistor. The voltage
across the external resistor is also used to monitor the actual charge
current. The constant voltage is fixed at 4.2V with 0.7% accuracy over
EP SUFFIX (PB-FREE)
98ASA10774D
a -20°C to 70°C temperature range. The trickle-mode current is preset
8-PIN UDFN
to 20% of the CC-mode current when the battery voltage is lower than
the trickle-mode threshold. The end-of-charge (EOC) current threshold
is preset to 10% of the CC-mode current to save the board space and
cost. A charge current thermal foldback feature limits the charge
ORDERING INFORMATION
current when the IC internal temperature rises to a preset threshold.
The MC34671 also protects the system with its input over-voltage
protection (OVP) feature. In addition, the MC34671 has a 2.6V falling
power-on-reset (POR) threshold, making it perfect to work with current
Device
MC34671AEP/R2
Temperature
Range (TA)
-40°C to 85°C
Package
8-UDFN
limited power supplies. Three indication pins (PPR, CHG and FAST)
can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws
less than 1.0µA leakage current from the battery.
Features
• No external MOSFET, reverse-blocking diode or current-sense resistor are required
• Guaranteed maximum 600mA programmable CC-mode current
• ±0.7% voltage accuracy over -20°C to 70°C
• ±5% current accuracy over -40°C to 85°C
• 28V maximum voltage for the power input with 11V over-voltage protection threshold
• 2.6V minimum input operating voltage
• Trickle charge for fully discharged batteries
• Charge current monitor
• Charge current thermal foldback
• Pb-free packaging designated by suffix code EP
VIN
34671
VIN
CIN GND
BAT
COUT
TO BATTERY
OFF
ON
CHG
PPR
EN
ISET
FAST
RISET
VIO
TO MCU
Figure 1. 34671 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.
1 page  
www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics
Characteristics noted under conditions VIN = 5.0V, -40°C ≤ TA ≤ 85°C, CIN = 1.0µF, COUT = 2.2µF (see Figure 1), unless
otherwise noted. Typical values noted reflect the approximate parameter means at VIN = 5.0V and TA = 25°C under nominal
conditions, unless otherwise noted.
Characteristic
Symbol Min Typ Max Unit
POWER INPUT
Input Voltage Range(5)
VIN Pin Supply Current
Charger enabled(6)
Charger disabled
VIN 2.6
IIN
-
-
Regulated Output Voltage
VIN = 5.0V; IBAT = 10mA; TA = 25°C
VIN = 5.0V; IBAT = 10mA; TA = -20 to 70°C
VIN = 5.0V; IBAT = 10mA; TA = -40 to 85°C
VBAT
4.185
4.170
4.158
Power MOSFET On Resistance
VBAT = 4V; IBAT = 500mA; ICHG = 600mA
RDS(ON)
-
BAT Pin Standby Current
VIN not powered or charger disabled
ISTDBY
-
Power On Reset
Rising VIN threshold
Falling VIN threshold
VPOR
3.0
-
VIN-BAT Offset Voltage
Rising threshold
Falling threshold
VOS
-
1.0
Over-voltage Protection Rising Threshold
Over-voltage Protection Threshold Hysteresis
VOVP
VOVPHYS
10
-
CHARGE CURRENT
Constant Current Mode Charge Current Range(7)
ICHG Accuracy
For ICHG between 300mA to 600mA(7)
For ICHG between 50mA to 300mA (Tested at 300mA)
ICHG
ICHG
50
95
90
Trickle-mode Charge Current
ITRKL
16
End-of-Charge (EOC) Threshold
When ICHG is set to 300mA
IEOC
20
ISET Pin Voltage for ICHG Reference(7)
VISET
-
Notes
5. Refer to the Power-on-Reset parameter for VIN turn on and turn off values.
6. Supply current does not include the current delivered to the battery through the BAT pin.
7. Not tested. Guaranteed by design.
-
1400
-
4.20
4.20
4.20
500
-
-
2.4
-
-
11
400
-
100
100
20
30
1.0
10
-
350
4.215
4.230
4.230
700
1.0
3.9
2.6
60
22
12
-
V
µA
V
mΩ
µA
V
mV
V
mV
600 mA
%
105
110
24 % ICHG
mA
40
-V
Analog Integrated Circuit Device Data
Freescale Semiconductor
34671
5
5 Page 
www.DataSheet4U.com
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The MC34671 is a fully-integrated Li-Ion and Li-Polymer
battery charger in a tiny package. It uses current, voltage and
temperature control loops to regulate the charge current. It
has up to a 28V input voltage rating, which makes the
handheld device safe even when connected to a wrong AC
adapter.
The MC34671 requires only two external capacitors and
one resistor to build a fully functional charger for space-
limited applications such as cell phones, Bluetooth
accessories and MP3 players. Its ultra high-accuracy
(±0.7%) output voltage and temperature-limited charging
current offer additional battery safety during charging.
The CC-mode current can be programmed with an
external resistor (RISET). The voltage across this resistor is
proportional to the charge current, so the system can monitor
the charge current during the whole charge cycle. The EOC
current threshold is preset to 10% of the CC-mode current.
For a deeply discharged battery with a voltage lower than
2.7V, the MC34671 charges the battery with a trickle-mode
current, which is 20% of the CC-mode current.
Three indication outputs make it easy to report the input
power status and the charge status to MCUs, or users via
LEDs.
FUNCTIONAL PIN DESCRIPTION
INPUT SUPPLY (VIN)
The supply input. This pin should be bypassed to ground
with a 1.0µF capacitor.
POWER PRESENT INDICATOR (PPR)
Open-drain logic output to indicate the input-power status.
The PPR pin output is only determined by the input voltage,
not other conditions such as the EN pin input. The output is
low if VIN is higher than VPOR. This pin is capable to sink at
least 12.0mA of current to drive an LED indicator.
CHARGE INDICATOR (CHG)
Open-drain logic output to indicate the charge status. The
output is low when the MC34671 is charging, until the EOC
conditions are reached. This pin is capable to sink at least
12.0mA of current to drive an LED indicator.
ENABLE (EN)
Active low enable logic Input. This pin is internally pulled to
ground by a weak current source. When left floating, the
charger is enabled. Pulling this pin to a high voltage,
externally disables the charger.
GROUND (GND)
Ground.
FAST CHARGE INDICATOR (FAST)
When charging, this open-drain logic output indicates
whether or not the battery voltage is higher than the trickle-
mode threshold. This pin is capable to sink more than 0.3mA
of current. When the charger is on, this pin outputs a logic low
signal if the battery voltage is higher than the trickle-mode
threshold. When the charger is in the shutdown mode or in
any fault conditions, this pin outputs a high-impedance.
CC-MODE CURRENT SETTING AND CHARGE
CURRENT MONITOR (ISET)
The CC-mode current, ICHG, is programmed by connecting
a resistor, RISET, between this pin and the ground. When
charging in the CC-mode, the voltage at this pin is 1.0V. The
voltage reduces proportionally as the charge current reduces
in the CV-mode. During the whole charge cycle, the voltage
at this pin can be used to monitor the charge current using the
following equation:
IBAT
=
V-----I--S---E---T-
1.0V
⋅
ICHG
equ. 1
where IBAT is the actual charge current, ICHG is the
programmed CC-mode current, and VISET is the voltage of
the ISET pin during the whole charge cycle.
CHARGER OUTPUT (BAT)
Charger output pin. Connect this pin to the battery being
charged. Bypass to ground with a 2.2µF or higher capacitor.
EXPOSED PAD (EPAD)
Exposed pad. It must be soldered on the large ground
plane of the PCB to enhance the thermal conductivity. The
pad must be connected to GND electrically.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34671
11
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