NJM2345
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NJM2345 - NJM2345
NJM2345
DC/DC Converter with Standby Function
NJM2345 step down DC/DC converter internal 1.5A power transistor, pulse-by pulse current limit circuit precision reference make NJM2345 suitable wide range voltage converter needs. NJM2345 features standby function that used both power saving safety operation.
PACKAGE OUTLINE
NJM2345D
NJM2345M
FEATURES Operating Voltage 3.0V Wide Oscillator Frequency 1kHz 150kHz duty ratio 100% Reference Voltage Vth=1.25V Internal High Power Transistor 1.5A max. Internal Over Current Limit Circuit switching control Standby Function typ. Bipolar Technology Package Outline NJM2345D DIP8 NJM2345M DMP8 CONFIGURATION
BLOCK DIAGRAM FUNCTION IN6. ON/OFF
1.5A
Logic
ON/OFF High :OFF (Standby)
NJM2345D NJM2345M
Block Duty =100%
Sense
300mV
Error Vref 1.25V COMP
Buffer
Ver.2009-10-19
NJM2345
ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Maximum Supply Voltage Comparator Input Voltage ON/OFF Terminal Voltage VON/OFF Output Switch Voltage Output Switch Current Power Dissipation Operating Temperature Range Storage Temperature Range Topr Tstg MAXIMUM RATINGS -0.3 (note) -0.3 (note) DIP8 DMP8 (*1) (*2) +150 UNIT
(note) When supply voltage less than 40V, absolute maximum input voltage equal supply voltage. (*1) board 114.3mm 76.2mm 1.6mm(2 layer FR-4) Conform EIA/JEDEC (*2) board 114.3mm 76.2mm 1.6mm(4 layer FR-4) Conform EIA/JEDEC
POWER DISSIPATION AMBIENT TEMPERATURE
Power Dissipation Ambient Temperature 1000 (mW) Ambient Temperature
DMP8 layer Board layer Board
(Topr=-40~+85oC, ~150oC)
DIP8
Power Dissipation
Ver.2009-10-19
NJM2345
ELECTRICAL CHARACTERISTICS Characteristics (V+= VON/OFF=5V, Ta=25°C) PARAMETER SYMBOL OSCILLATOR BLOCK Oscillation Frequency Charge Current Discharge Current Voltage Swing CURRENT LIMIT Peak Current Sense Voltage OUTPUT SWITCH Saturation Voltage Output Transistor Bias Resistance Collector Off-State Current Maximum duty ratio ERROR AMPLIFIER Threshold Voltage Input Bias Current ON/OFF BLOCK Threshold Voltage Threshold Voltage Input Bias Current (ON/OFF Terminal) GENERAL CHARACTERISTICS Standby Current Operating Current IN-= 1.2375 1.250 1.2625 fOSC Ichg Idis VOSC IN-= Vth-5V, CT=1nF VP-P
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
CT=1nF
Vipk
Vsat Rbias IC(Off) MAXDUTY
ISW=0.7A
0.01
VCE=40V IN-=0V
VOFF ION/OFF VON/OFF=5V
0.56
ICCSTBY
VON/OFF=0V CT=1nF, SI=V+, IN->Vth, ES=GND
(note) Output switch tests performed under pulsed conditions minimize power dissipation.
Ver.2009-10-19
NJM2345
TYPICAL APPLICATIONS Step-Down Converter
ON/OFF CONTROL
RON/OFF
VOUT
NJM2345
COUT
Though ION/OFF decreases inserting "RON/OFF between ON/OFF terminal terminal, minimum operating voltage increased resister RON/OFF
schottky diode.
Step-Down Converter (High Current)
ON/OFF CONTROL
RON/OFF
VOUT
NJM2345
COUT
Though ION/OFF decreases inserting "RON/OFF between ON/OFF terminal terminal, minimum operating voltage increased resister RON/OFF
schottky diode.
Ver.2009-10-19
NJM2345
TIMING CHART
Error Output Oscillator Waveform HIGH Switch Output Sense Output HIGH
Block
Ver.2009-10-19
NJM2345
TYPICAL CHARACTERISTICS
Oscillator Frequency Timing Capacitor =5V, SI=V 5=GND, Ta=25 Oscillator Frequency (kHz)
Saturation Voltage Collector Current Saturation Voltage Vsat1 Collector Current (V+=5V, CS=CD, Ta=25oC)
1000 10000 Timing Capacitor (pF)
100000
Input Bias Current Terminal Voltage Input Bias Current (nA) (V+=5V, Ta=25oC)
Terminal Voltage Output Voltage Threshold Voltage Output Voltage Rc=100k Rc=50k =10V, Vo=5V, Io=150mA, Ta=25
Operating Current Operating Voltage =1nF, IN->V Es=GND, Ta=25 (mA)
Operating Current
Rc=0
Operating Voltage
0.55 0.65 0.75 Threshold Voltage
Ver.2009-10-19
NJM2345
TYPICAL CHARACTERISTICS
ON/OFF Input Bias Current ON/OFF Terminal Voltage (uA) Rc=100k Rc=50k
+=10V, Vo=5V, Io=150mA, Ta=25
Threshold Voltage Temperature 1.28 1.27 1.26 1.25 1.24 1.23 1.22 1.21 Ambient Temperature =5V)
ON/OFF Input Bias Current
on/off
ON/OFF Terminal Voltage on/off
Saturation Voltage Temperature
sat1
(V+=5V, CS=CD, =0.7A)
Ambient Temperature (oC)
Saturation Voltage
Threshold Voltage
Rc=0
Current Limit Sense Voltage Temperature (mV) Ambient Temperature =5V)
Operating Current (mA)
Operating Current Temperature Ambient Temperature =5V, =1nF, =V+, IN->V Es=GND)
Ver.2009-10-19
Current Limit Sense Voltage
NJM2345 MEMO
[CAUTION] specifications this databook only given information without guarantee regards either mistakes omissions. application circuits this databook described only show representative usages product intended guarantee permission right including industrial rights.
Ver.2009-10-19
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