Preliminary Datasheet
LP78071
1A Charge+ 1.5A Synchronous Boost PMIC
General Description
The LP78071 is a PMIC，which has 1ch Charger and
1ch Synchronous Boost Converter with ESOP-8 and
TDFN10 package.
Its charger is a complete constant-current constant
voltage linear charger for single cell lithium-ion
batteries. Furthermore, the LP78071 is specifically
designed to work within USB power specifications. No
external sense resistor is needed, and no blocking
diode is required due to the internal MOSFET
architecture. Thermal feedback regulates the charge
current to limit the die temperature during high power
operation or high ambient temperature. The charge
voltage is fixed at 4.2V, and the charge current can be
ISET rammed externally with a single resistor. The
charger automatically terminates the charge cycle
when the charge current drops to 1/10th the ISET
rammed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LP78071 automatically enters a low
current state, dropping the battery drain current to less
than 4µA.
Other features include charge current monitor, under
voltage lockout, automatic recharge and a status pin to
indicate charge termination and the presence of an
input voltage.
Boost converter is Synchronous
current mode boost
DC-DC converter. Its PWM circuitry with built-in 3A
Current power MOSFET makes this converter highly
power efficiently. Selectable high switching frequency
allows faster loop response and easy filtering with a
low noise output. The non-inverting input and its error
amplifier is connected to an internal 800mV precision
reference voltage.
Features
Charger:
Programmable Charge Current Up to 1000mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
8µA Supply Current in Shutdown
Drainage Charge Current Thermal Regulation
Status Outputs for LED or System Interface
Boost:
1.5A Output Current Synchronous Boost
Converter
600KHz fixed frequency switching
High Switch On Current: 3A
Low RDS(ON) Integrated Power Mosfet
Efficiency is 94%
Built-in OVP, OTP, OCP, Soft-Star
Consumption Available in ESOP-8 Package
RoHS Compliant and 100% Lead (Pb)-Free
Marking Information
Device
LP78071SPF
LP78071QVF
Marking
Package
SP:ESOP-8
QV:TDFN10
Shipping
3K/REEL
Order Information
LP78071
□ □
□
F: Pb-Free
Package Type
SP: ESOP-8
QV:TDFN-10
Applications
MID/Pad
Power Bank
Smart Phone
Bluetooth Applications
LP78071 – 00
Version 1.0
Feb.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 1 of 16
Preliminary Datasheet
LP78071
Pin Description
TDFN-10
1
2
ESOP8
1
2
PIN
FB
LX
DESCRIPTION
Boost Feedback pin. The pin voltage is 0.8V.
Boost Output switching node. SW is the drain of the internal low-side N-Channel MOSFET
and high-side P-Channel MOSFET. Connect the inductor to SW to Complete the step-up
converter.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low
3
4
3
CHRG_B
CE
by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled
High.
Charge enable pin.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is
programmed by connecting a 1% resistor(R
PROG
)to ground. When charging in constant-current
mode, this pin servos to 2V. In all modes, the voltage on this pin can be used to measure the
charge current using the following formula.LP78071: Iset=1000/Rprog.
5
4
ISET
6,11
7
8
9
5
6
GND
Vin
BAT
Ground Pin.
VIN is the input power source. Connect to a wall adapter.
BAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for
stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic
capacitor is required.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled High
by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled Low.
Boost enable pin. Active High.
9
10
7
8
VOUT
EN
LP78071 – 00
Version 1.0
Feb.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 3 of 16
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