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Preliminary Datasheet
LP6342
1.5MHz, 2A Step-down Converter
General Description
The LP6342 is a 1.5MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The LP6342 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The LP6342 can supply up to 2A output load current from a 2.5V to 5.5V input voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The LP6342 is available with adjustable (0.6V to VIN) output voltage. The device is available in a Pb-free, 3mm x 3mm 10-lead TDFN or MSOP-10,SOP8(EP) package and is rated over the-40°C to +85°C temperature range.
Order Information
LP6342 □ □ □
F: Pb-Free
Package Type QV: TDFN-10 MS: MSOP-10 SP:SOP8(EP)
Features
Input Voltage Range: 2.5V to 5.5V Output Voltage Range: 0.6V to VIN 2A Output Current Low R(DSON) Internal Switches:130mΩ High Efficiency :Up to 95% 100% Duty Cycle in Dropout Low Shutdown Current: < 1 u A 1.5MHz Switching Frequency Soft star Function Short Circuit Protection Thermal Fault Protection 3 m m × 3 m m TDFN-10 or MSOP-10,SOP8(EP)
Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
Portable Instruments DSP Core Supplies Cellular Phone and Smart mobile phone PDA
GPS Applications
Marking Information
Please see website:www.lowpowersemi.com.
Typical Application Circuit
VIN C1 10uF
GND PGOOD GND GND
2 Vin LP6342 SW 7
3 Vin
SW 8
1 EN
FB 5
L1 2.2uH
Vout=(R1/R2+1)*VFB
Vout_2A
R1 C2 22uF
R2
6 4 9 10
LP6342-03 Version 1.3 Datasheet Oct.-2011
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Preliminary Datasheet
LP6342
Functional Pin Description
TOP VIEW
EN 1
VIN 2 LP6342
VIN 3 PGOOD 4
11 GND
FB 5
10 GND 9 GND 8 SW 7 SW 6 GND
EN 1 VIN 2 VIN 3 PGOOD 4 FB 5
TDFN-10
MSOP10
LPS LP6342
10 GND 9 GND 8 SW 7 SW 6 GND
EN 1 VIN 2 VIN 3 FB 4
LP6342 9 PGND
ESOP8
8 GND 7 GND 6 SW 5 GND
Pin Description
Pin NO
TDFN-10 MSOP10 ESOP8
1 11
2, 3 2, 3 2,3
44 9,10 9,10 5,7,8
5 54
66 7, 8 7, 8
6
9 11 11
PIN
EN Vin PGOOD GND/PGND FB GND SW
PAD
Function Block Diagram
DESCRIPTION
Enable pin. Active high. In shutdown, all functions are disabled drawing <1μA supply current. Do not leave EN floating. Supply Input. Power supply input pin. Must be closely decoupled to AGND with a 10μF or greater ceramic capacitor. Power good output. Ground. Feedback Input. Connect FB to the center point of the external resistor divider. Normal voltage for this pin is 0.6V. Ground. Switch Mode Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches.
Ground pad.
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Preliminary Datasheet
LP6342
Absolute Maximum Ratings
Input Voltage to GND ----------------------------------------------------------------------------------------- 6V SW to GND (VSW) -------------------------------------------------------------------------- -0.3V to VIN +0.3V FB to GND (VFB) ---------------------------------------------------------------------------- -0.3V to VIN +0.3V EN to GND (VEN) ------------------------------------------------------------------------------------ -0.3V to 6V Operating Temperature Range (TA) --------------------------------------------------------------- -40℃ to 85℃ Storage Temperature Range (TJ) ----------------------------------------------------------------- -65℃ to 150℃ Maximum Soldering Temperature (at leads, 10sec) ------------------------------------------------------ 260℃ ESD Susceptibility HBN(Human Body Mode) ----------------------------------------------------- 2KV
MM(Machine Mode) ------------------------------------------------------------ 200V
Electrical Characteristics
(VIN =VEN, Typical values are TA=25℃ )
Symbol VIN
Parameter Input Voltage
Conditions
Min. 2.5
ΔVLINEREG/ΔVIN Line Regulation
VIN = 2.5V to 5.5V, IOUT = 10mA
ΔVLOADREG/ΔIOUT Load Regulation
VOUT
Output Voltage Range
IQ Quiescent Current
ISHDN
Shutdown Current
ILIM P-Channel Current Limit
Iout=10mA to 2000mA
VFB=0V,VIN=4.2V EN = GND
0.6
RDS(ON)H RDS(ON)L
ISWLEAK VFB
High-Side Switch On Resistance
Low-Side Switch On Resistance
SW Leakage Current
Feedback Threshold Voltage Accuracy
VEN=0V, VSW=0 or 5V, VIN=5V
VIN=2.5to5.5V,
IOUT = 10 to 2000mA
0.585
IFB
FB Leakage Current
VOUT = 1 .0V
FOSC TS
TSD
Oscillator Frequency
Startup Time
Over-Temperature Shutdown Threshold
VFB=0.6V
From Enable to Output Regulatio.