PSC5415
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Description
The PSC5415 combines a highly integrated switch-mode charger, to minimize single-cell Lithium-ion (Li-ion) charging time
from a USB power source, and a boost regulator to power a USB peripheral from the battery.
The charging parameters and operating modes are programmable through an I
2
C interface that operates up to 3.4Mbps. The
charger and boost regulator circuits switch at 1.5MHz to minimize the size of external passive components.
The PSC5415 provides battery charging in three phases: conditioning, constant current, and constant voltage.
To ensure USB compliance and minimize charging time, the input current is limited to the value set through the I
2
C host.
Charge termination is determined by 1/10 of the setting current.
The integrated circuit (IC) automatically restarts the charge cycle when the battery falls below an internal threshold. If the
input source is removed, the IC enters a high-impedance mode with leakage from the battery to the input prevented. Charge
status is reported back to the host through the I
2
C port. Charge current is reduced when the die temperature reaches 120℃.
The PSC5415 can operate as a boost regulator on command from the system. The boost regulator includes a soft-start that
limits inrush current from the battery.
The PSC5415 is available in a 2.0 x 1.7mm, 20-bump, 0.4mm pitch WLCSP package.
Figure 1: Typical Application
Feature
Fully Integrated, High-Efficiency Charger for Single-Cell
Li-lon and Li-Polymer Battery Packs
Faster Charging than Linear
Charge Voltage Accuracy: ±1% 25℃
±7.5% Charge Current Regulation Accuracy
20V Absolute Maximum Input Voltage
6V Maximum Input Operating Voltage
1.5A Maximum Charge Rate
Application
Cellular Phones, Smart Phones, PDAs
Tablet, Portable Media Players
Gaming Device, Digital Cameras
Rev.06.1
1
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PSC5415
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Programmable
-Input Current
-Fast-Charge/Termination Current
-Charger Voltage
-Termination Enable
1.5MHz Synchronous Buck PWM Controller with Wide
Duty Cycle Range
Small Footprint 2.2μH External Inductor
Weak Input Sources Accommodated by Reducing
Charging Current to Maintain Minimum VBUS Voltage
Low Reverse Leakage to Prevent Battery Drain to VBUS
5V, 500mA Boost Mode for USB OTG for 2.7 to 4.5V
Battery Input
through
High-Speed
I
2
C
Interface
(3.4Mb/s) with Fast Mode Plus Compatibility
Recommended External Components
Component
L1
(Ich<=1.5A)
L1
(Ich>1.5A)
Description
2.2uH, 20%, 2.2A
4mm*4mm*1.8mm
2.2uH, 20%, 4.9A
8mm*8mm*3mm
Vendor
SUNLORD:SPH4018H2R2MT
Parameter
L
DCR(Series R)
Typ.
2.2
42
2.2
12
22
Units
μH
mΩ
μH
mΩ
μF
SUNLORD:SPH8030H2R2MT
L
DCR(Series R)
C
BAT
22μF,10%,6.3V,X5R,0603
Murata: GRM188R60J226M
C
C
MID
22μF,10%,6.3V,X5R,0603
Murata: GRM188R60J226M
C
22
μF
C
BUS
1.0μF,10%,25V,X5R,0603
Murata: GRM188R61E105M
C
1.0
μF
Rev.06.1
2
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PSC5415
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Block Diagram
Figure 2: IC and System Block Diagram
Pin Configuration
A1
B1
C1
D1
E1
A2
B2
C2
D2
E2
A3
B3
C3
D3
E3
A4
B4
C4
D4
E4
A4
B4
C4
D4
E4
A3
B3
C3
D3
E3
A2
B2
C2
D2
E2
A1
B1
C1
D1
E1
Top View
Figure 3: WLCSP-20 Pin Assignments
Bottom View
Rev.06.1
3
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PSC5415
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Pin Definitions
Pin#
A1,A2
A3
A4
B1-B3
B4
C1-C3
C4
Name
VBUS
BOOT
SCL
PMID
SDA
SW
STAT
Description
Charger Input Voltage
and USB-OTG output voltage. Bypass with a 1μF capacitor to PGND
Boost strap capacitor
connection for high side NMOS gate driver. Connect 33nF~100nF
ceramic capacitor (voltage rating
≥
10V) from BOOT to SW pin.
I
2
C Interface Serial Clock.
This pin should not be left floating.
Power Input Voltage.
Power input to the charger regulator, bypass point for the input current
sense, and high-voltage input switch. Bypass with a minimum of 22μF, 6.3V capacitor to PGND.
I
2
C Interface Serial Data.
This pin should not be left floating.
Switching Node.
Connect to output inductor.
Status.
Open-drain output indicating charge status. The IC pulls this pin LOW when charge is in
process.
Power Ground.
Power return for gate drive and power transistors. The connection from this pin to
the bottom of C
MID
should be as short as possible.
On-The-Go.
Enables boost regulator in conjunction with OTG_EN and OTG_PL bits
(see
Table 16).
Current-Sense Input.
Connect to the sense resistor in series with the battery. The IC uses
this node to sense current into the battery. Bypass this pin with a 0.1μF capacitor to PGND.
Charge Disable.
If this pin is “1”, charging is disabled. When LOW, charging is controlled by I2C
registers.
Bias voltage.
Connect to a 1uF capacitor to PGND. The output voltage is PMID, which is limited
to 6.5V. Any resistor loading to VREF is
NOT
recommended.
Battery Voltage.
Connect to the positive (+) terminal of the battery pack. Bypass with a 0.1μF
capacitor to PGND if the battery is connected through long leads.
D1-D3
PGND
D4
OTG
E1
CSIN
E2
DISABLE
E3
VREF
E4
VBAT
Rev.06.1
4
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PSC5415
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Maximum Ratings and Thermal Characteristics(T
A
=25℃ unless otherwise noted)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable
above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition,
extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute
maximum ratings are stress ratings only.
Parameter
VBUS Voltage
STAT Voltage
PMID Voltage
SW,CSIN,VBAT,VREF, DISABLE Voltage
Voltage on Other Pins
Maximum VBUS Slope above 5.5V when Boost or Charger are Active
Electrostatic Discharge
Protection Level
Junction Temperature
Storage Temperature
Lead Soldering Temperature, 10 Seconds
Note:
2: Lesser of 6.5V or V
I
+ 0.3V.
Human Body Model per JESD22-A114
Charged Device Model per JESD22-C101
Continuous
Pulsed,100ms Maximum Non-Repetitive
Symbol
V
BUS
V
STAT
V
I
V
O
dV
BUS
dt
ESD
T
J
T
STG
T
L
Min.
-1.4
-2.0
-0.3
Max.
20.0
20
7.0
Units
V
V
V
V
V/μs
-0.3
-0.3
7.0
6.5
(2)
4
2000
500
V
+150
+150
+260
℃
℃
℃
-40
-65
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating
conditions are specified to ensure optimal performance to the datasheet specifications. Prisemi does not recommend
exceeding them or designing to absolute maximum ratings.
Parameter
Supply Voltage
Maximum Battery Voltage when Boost enabled
Negative VBUS Slew Rate during VBUS Short Circuit,
C
MID
≤
22μF, see VBUS Short While Charging
Ambient Temperature
Junction Temperature (see Thermal Protection section)
T
A
≤60℃
Symbol
V
BUS
V
BAT(MAX)
-
T
A
≥60℃
dV
BUS
dt
T
A
T
J
Min.
4.5
Max.
6
4.5
4
Units
V
V
V/μs
2
-30
-30
+85
+140
℃
℃
Rev.06.1
5
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