SPICE MODEL of NJM2887 in SPICE PARK. English Version is http://www.spicepark.net. Japanese Version is http://www.spicepark.com by Bee Technologies.

1. Device Modeling Report
COMPONENTS: ADJUSTABLE LOW DROPOUT
VOLTAGE REGULATOR
PART NUMBER: NJM2887
MANUFACTURER: NEW JAPAN RADIO CO., LTD.
Bee Technologies Inc.
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005

2. BJT MODEL
Pspice model
Model description
parameter
IS Saturation Current
BF Ideal Maximum Forward Beta
CJC Zero-bias Collector-Base Junction Capacitance
TF Forward Transit Time
TR Reverse Transit Time
DIODE MODEL
Pspice model
Model description
parameter
IS Saturation Current
RS Series Resistance
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005

3. Dropout Voltage Characteristics
Circuit Simulation result
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V
V(VOUT)
V_VIN
Evaluation circuit
U2
VIN VOUT
CONT
VADJ V
R2
V1 GND
4Vdc VCONT 132.5k R3
NJM2887
C1 4Vdc C2
0.33uF 10
VQ 2.2u
0Vdc R1
0 0
0 100k
0
0 0 0
Simulation Result
Condition: R1=100k, R2=132.5k, Co=2.2uF
Condition: IO=1mA Measurement Simulation Error (%)
∆VI-O 180.000 mV 180.000 mV 0.000
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005

4. Ripple Rejection (R•R) Characteristic
Circuit Simulation result
100
90
80
70
60
50
40
30
20
10Hz 100Hz 1.0KHz 10KHz 100KHz
DB(V(VIN)/V(VOUT))
Frequency
Evaluation circuit
U1
IN OUT
VIN VOUT
CONT
V2
0.2Vac VADJ R2
GND
0Vdc 132.5k
CIN VCONT Rload
NJM2887
4Vdc COUT
V3 0.33uF 30
4Vdc VQ 2.2uF
0Vdc R1
0
0 100k
0
0 0 0 0
Simulation Result
Condition: f=1KHz, ein=200mVrms, Io=10mA, VO=3.00V Version
Measurement Simulation Error (%)
R•R 70.000 dB 70.145 dB 0.207
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005

5. Output Voltage vs. Output Current Characteristics
Circuit Simulation result
4.0V
3.5V
3.0V
2.5V
2.0V
1.5V
1.0V
0.5V
0V
0A 0.2A 0.4A 0.6A 0.8A 1.0A
V(VOUT)
I(V7)
Evaluation circuit
U1
IN OUT
VIN VOUT
CONT
V2
0.2Vac VADJ R2 NL2
GND V7
0Vdc 132.5k
CIN VCONT 0Vdc
NJM2887
4Vdc COUT V(NL1, 0)*(V(NL2,0)-1) V8
V3 0.33uF R5
2.2uF E1
4Vdc VQ
0Vdc R1 OUT+ IN+ T1 = 0 1MEG
0 OUT- IN-
0 100k EVALUE V1 = 1
0 T2 = 0.1 0
0 0 0 NL1
V2 = 1
RL T3 = 0.5
50 0 0
V3 = 0.1
T4 = 1
V4 = 0
0
Simulation Result
Condition: R1=100k, R2=132.5k, Co=2.2uF
Condition: VIN=4V Measurement Simulation Error (%)
IOSC 170.000 mA 171.075 m 0.632
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005

6. Output Voltage vs. Control Voltage
Circuit Simulation result
4.0V
3.5V
3.0V
2.5V
2.0V
1.5V
1.0V
0.5V
0V
0V 0.5V 1.0V 1.5V 2.0V 2.5V 3.0V
V(VOUT)
V(CONT)
Evaluation circuit
U2
VIN VOUT
CONT
VADJ V
R2
V1 V1 = 0 GND
4Vdc 132.5k R3
VCONT NJM2887
C1 = 5
V2 C2
0.33uF 100
TD = 100m VQ 2.2u
0Vdc R1
0 0
TR = 100m
0 100k
TF = 100m
0
PW = 100m 0 0 0
PER = 500m
Simulation Result
Condition: R1=100k, R2=132.5k, Co=2.2uF
Measurement Simulation Error (%)
VCONT(ON) 1.600 V 1.600 V 0
VCONT(OFF) 0.600 V 0.600 V 0
All Rights Reserved Copyright (c) Bee Technologies Inc. 2005