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PDF BC3770 Data sheet ( Hoja de datos )
| Número de pieza | BC3770 | |
| Descripción | 2.0A Switch-Mode Charger | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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Freescale Semiconductor
Advance Information
2.0 A Switch-Mode Charger with
Intelligent Power-Path for 1-Cell
Li-Ion Battery
Document Number: MC32BC3770
Rev. 1.0, 10/2015
BC3770
The BC3770 is a fully programmable switching charger with dual-path output for
single-cell Li-Ion and Li-Polymer battery. This dual-path output allows mobile
applications with fully discharged battery or dead battery to boot up the system.
High-efficiency and switch-mode operation of the BC3770 reduce heat
dissipation and allow for higher current capability for a given package size. In
addition, the BC3770 features single input with a 20 V withstanding input and
charges the battery with the current up to 2.0 A. The charging parameters and
operating modes are fully programmable over an I2C Interface that operates up
to 400 kHz.
The BC3770 is a highly integrated synchronous switch-mode charger, featuring
integrated OVP and Power FETs. The charger and boost regulator circuits
switch at 1.5 MHz to minimize the size of external passive components. The
BC3770 is able to operate as a boost regulator for USB-OTG function via either
I2C command or an external pin from the host/processor. The BC3770 is
available in a 25-bump, 2.27 mm x 2.17 mm, WLCSP package.
Features
• Dual-path output to power-up system in dead battery
• Single input for USB/TA
• High-efficiency synchronous switching regulator
• 20 V maximum withstanding input voltage
• Minimize the charging time with remote sense
• Up to 2.0 A load current for system or battery
• Programmable charge parameters via I2C compatible interface
• 400 kHz full-speed I2C interface
• 1.5 MHz switching frequency
• Charge reduction mode for maximizing charging efficiency
BATTERY CHARGER
CS SUFFIX
98ASA00848D
25 WLCSP
Applications
• Internet of Things (IoT)
• Handheld consumer devices
• Wearable application
• mPOS terminals
• Medical portable equipment
• Consumer tablets
USB/TA
VBUS
D-
D+
ID
GND
Charge
Detector
System I/O
INT
SDA
SCL
MCU
GPIO
GPIO
ADC
BC3770
VBUS
PMID
PGND
VL
GND
BOOT
LX
VIO
INTB
SDA
SCL
CHGENB
VSYS
CHGOUT
BATREG
SHDNB
NOBAT
BATSNSN
System
Load
Optional
+
VF 1-Cell
Li-Ion
- Battery
connected on the PCB
Figure 1. BC3770 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., 2015. All rights reserved.
1 page  
Table 2. BC3770 Pin Definitions (continued)
Pin
Pin Name
Pin
Function
Formal Name
Definition
B5
INTB
Output
Logic Output for Interrupt
An open-drain output with an external pull-up resistor, 200 k, to the system I/O
supply. Active-low when status change on interrupt registers occurs.
C1, D1
LX
Switching Node
Connect a 1.0 H inductor. The two LX pins must be connected together
externally.
Connect the pin to VF or ID pin on the battery cell. It has an internal pull-up
C2
NOBAT
Input
Logic Input for Battery
Presence Detection
resistance, 300 k typ, to the VL. If a logic-high threshold is detected on the pin,
the charging is suspended immediately. If this pin is not used, connect it to
ground.
C3
GND
Ground
Device Ground
Must be connected to the system ground.
C4 BATREG
Battery + Terminal Sensing Connect to positive terminal of battery cell as close as possible.
C5, D5, E5 CHGOUT Output
Battery Charger Output
These pins must be connected together externally. Bypass with a 4.7 F/10 V or
higher to ground.
Logic-low to enable charger. Logic-high to disable the charger, not to disable
D2
CHGENB
Input
Charger Enable Logic Input
buck converter. It has an internal 300 k resistance to ground. If this pin is not
used, leave it open or connect it to ground. The serial interface, I2C, is still
available in CHGENB = High.
If there is no valid input source, logic-low is to put the I2C interface into Disabled
mode to reduce the idle current as low as possible. In the Shutdown mode, I2C
interface is not available but the Q4 FET is kept ON. A valid power source on
D3
SHDNB
Input
Logic Input for Disabling I2C
Interface
VBUS is able to overwrite to wake-up the device for Charge mode even in
SHDNB = Low. This pin is not effective as long as a valid input power source is
present.
This pin has an internal pull-down resistance, 300 k typ. If this pin is not used,
tie it to the system I/O supply rail or an appropriate rail to reduce idle current as
low as possible.
D4, E3, E4 VSYS
Output
System Supply Output
VSYS is the power supply for the system load. When a valid power source at
VBUS is attached, VSYS is regulated at 3.6 V until the BATREG hits the
threshold of VSYS_MIN x RDS(on)_Q4. When the +Terminal on the battery cell is
regulated at VBATREG, the VSYS output is regulated to the IFAST_CHG x
RDS(on)_Q4 above BATREG. Bypass with a 10 F/10 V ceramic capacitor to
ground.
E1, E2
PGND
Ground
Power Ground for the Buck
Converter
The two PGND pins must be connected together externally.
BC3770
5
Analog Integrated Circuit Device Data
Freescale Semiconductor
5 Page 
Table 4. BC3770 Electrical Characteristics (continued)
Characteristics noted under conditions: VVBUS = 5.0 V, VBATREG = 3.7 V, VVIO = 1.8 V, CVBUS = CPMID = 2.2 F, CVSYS = 10 F,
CCHGOUT = 4.7 F, CVL = 1.0 F, L = 1.0 H, TA = - 40 °C to 85 °C *). Typical values are at TA = 25°C, unless otherwise noted. (6)
Symbol
Characteristic
Min Typ Max Unit Notes
Deglitch Timer (12) (CONTINUED)
VSYSOK Deglitch Time
tVSYSOK_DEB
• Duration VSYS stays above 3.6 V to set the VSYSOK interrupt
bit = 1 and pull the INTB pin Low in
—
27
—
ms
VBUSOK = ENCOMPARATOR = 1
VSYSNG Deglitch Time
tVSYSNG_DEB
• Duration VSYS stays at/below the VVSYS_MIN_OLP threshold to
set the VSYSNG interrupt bit = 1 and pull the INTB pin Low in
—
27
—
ms
Discharge mode and ENCOMPARATOR = 1
VSYSOLP Deglitch Time
tVSYSOLP_DEB
• Duration VSYS stays at/below the VVSYS_MIN_OLP threshold to
set the VSYSOLP interrupt bit = 1 and pull the INTB pin Low in
—
27
—
ms
Overload mode and VBUSOK = 1
Boost Converter
IS_OTG
Boost Supply Current
• In OTG enabled with no load
— 3.0 — mA
Output Regulation Voltage Range
• Programmable at PMID
5.0 — 5.2 V
ILIM_OTG
Cycle-by-Cycle Current Limit
— 2.4 —
Boost Output Regulation Voltage at VBUS
VBO_REG
• 3.0 V VBATREG 4.45 V, set to 5.1 V at PMID, 0 mA ILOAD 4.75 5.0 5.25
900 mA
A
V (13), (14)
IBO_MAX
VBAT_MAX_BO
Maximum Continuous Output Current at VBUS
• 3.0 V VBATREG 4.45 V
Battery Operation Voltage Range
• For the regulated output
0.9 — — A (13)
3.0 — 4.45 V (13)
VSTART_BO
VSTOP_BO
VBUS_OVP_H
BATREG Start Threshold Voltage for Boost
• VBATREG rising
BATREG Stop Threshold Voltage for Boost
• VBATREG falling
Overvoltage Protection at VBUS
• VBUS rising, 400 mV Hysteresis
— 2.9 —
— 2.5 —
— 5.4 —
V
V
V
INTB
Output Low Voltage
• ISINK = 5.0 mA
— — 0.4 V
Logic Inputs (CHGENB, SHDNB, and NOBAT)
VIH Logic Input High Voltage
VIL Logic Input Low Voltage
RPD
Pull-down Resistance to GND
• On CHGENB & SHDNB pin
1.2 — —
— — 0.4
— 300 —
V
V
k
RPU
Pull-up Resistance to VL
• On NOBAT pin
— 300 —
k
Notes
13. Guaranteed by design, characterization, and correlation with process controls. Not fully tested in production.
14. The regulation in boost is only guaranteed in the operation range.
BC3770
11
Analog Integrated Circuit Device Data
Freescale Semiconductor
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BC3770.PDF ] | |
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