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ICs for Mobile Communication
AN1281SSM
Ripple filter IC
I Overview
The AN1281SSM is a ripple filter IC that rejects the ripple component superimposed on the regulator output. Use for the VCO bias of cellular phones improves C/N and S/N.
1.600.10 0.20 1 1.200.10 0.20 5
Unit: mm
0.50 0.50
1.600.10 1.000.10
2
I Features
* Small I/O voltage difference * The mounting area is reduced by adopting the SSminitype package
3
4
0.60 max.
I Applications
* Cellular phones and others
0.12+0.10 -0.05
SSMINI-5D Note) The package of this product will be changed to lead-free type (SSMINI-5DA). See the new package dimensions section later of this datasheet. Part No. and marking
AP AP is the Part No. for AN1281SSM
I Block Diagram
VOUT 3 5 VIN Starter/smoothing circuit
Voltage control
Load 0.1 F
Constant current Switch 2 GND 1 CF 1 F 4 On/Off 4.7F
0 to 0.10
0.20+0.10 -0.05
Publication date: December 2001
SDM00008AEB
1
AN1281SSM
I Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *1
Symbol VIN ICC PD Topr Tstg IO VON/OFF CF
Rating 4.5 20 60 -25 to +75 -40 to +125 -15 VIN 10
Unit V mA mW C C mA V F
Operating ambient temperature Storage temperature Output current
*1
Allowable application voltage for on/off pin *3 Allowable maximum capacitance for CF pin
Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, '+' denotes current flowing into the IC, and '-' denotes current flowing out of the IC. 2. *1: Except for the power dissipation, the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: The power dissipation shown is the value for Ta = 75C. *3: Do not over the supply voltage.
I Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 2.5 to 4.3 Unit V
I Electrical Characteristics at Ta = 25C
Parameter Output voltage 1 Output voltage 2 Output voltage 3 Output voltage 4 Output voltage 5 Output voltage 6 Consumption current 1 Consumption current 2 Consumption current 3 Consumption current 4 Consumption current 5 Consumption current 6 Load regulation 1 Load regulation 2 Load regulation 3 Consumption current against load change 1 Consumption current against load change 2 2 Symbol VO1 VO2 VO3 VO4 VO5 VO6 ICC1 ICC2 ICC3 ICC4 ICC5 ICC6 REGL1 REGL2 REGL3 IREG1 IREG2 Conditions VIN = 2.5 V, IOUT = -1 A VIN = 2.5 V, IOUT = -15 mA VIN = 3.0 V, IOUT = -1 A VIN = 3.0 V, IOUT = -15 mA VIN = 4.3 V, IOUT = -1 A VIN = 4.3 V, IOUT = -15 mA VIN = 2.5 V, IOUT = -1 A VIN = 2.5 V, IOUT = -15 mA VIN = 3.0 V, IOUT = -1 A VIN = 3.0 V, IOUT = -15 mA VIN = 4.3 V, IOUT = -1 A VIN = 4.3 V, IOUT = -15 mA VIN = 2.5 V, IOUT = -1 A to -15 mA VIN = 3.0 V, IOUT = -1 A to -15 mA VIN = 4.3 V, IOUT = -1 A to -15 mA VIN = 2.5 V, IOUT = -1 A to -15 mA VIN = 3.0 V, IOUT = -1 A to -15 mA Min 2.10 1.97 2.62 2.55 3.95 3.83 -485 -420 -735 -670 Typ 2.30 2.17 2.82 2.70 4.15 4.03 -370 -320 -565 -515 Max 230 220 220 110 110 Unit V V V V V V A A A A mA mA mV mV mV A A
-1.42 -1.09 -1.36 -1.04 0 0 0 0 0 130 120 120 49 51
SDM00008AEB
AN1281SSM
I Electrical Characteristics at Ta = 25C (continued)
Parameter Consumption current against load change 3 Ripple rejection ratio 1 Ripple rejection ratio 2 Ripple rejection ratio 3 Consumption current at off * Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Symbol IREG3 RR1 RR2 RR3 IOFF
Conditions VIN = 4.3 V, IOUT = -1 A to -15 mA VIN = 3 V 0.1 V, IOUT = -15 mA f = 1 kHz VIN = 3 V 0.1 V, IOUT = -15 mA f = 25 kHz VIN = 3 V 0.1 V, IOUT = -15 mA f = 100 kHz VIN = 4.3 V, On/Off = 0 V
Min 0 26.5 30.5 26.5
Typ 51 29.5 33.5 29.1
Max 110 1
Unit A dB dB dB A
Parameter Output voltage 7 Consumption current 7 Load regulation 4 Consumption current against load change 4 Ripple rejection ratio 4 Ripple rejection ratio 5 Ripple rejection ratio 6 Output voltage rise time
Symbol VO7 ICC7 REGL4 IREG4 RR4 RR5 RR6 tr
Conditions VIN = 3.0 V, IOUT = -15 mA Ta = -25C to +75C VIN = 3.0 V, IOUT = -15 mA Ta = -25C to +75C VIN = 3.0 V, IOUT = -1 A to -15 mA Ta = -25C to +75C VIN = 3.0 V, IOUT = -1 A to -15 mA Ta = -25C to +75C VIN = 3.0 V 0.1 V, IOUT = -15 mA f = 1 kHz, Ta = -25C to +75C VIN = 3.0 V 0.1 V, IOUT = -15 mA f = 25 kHz, Ta = -25C to +75C VIN = 3.0 V 0.1 V, IOUT = -15 mA f = 100 kHz, Ta = -25C to +75C VIN = 3 V, VON/OFF = 0 V 3 V IOUT = -15 mA, VOUT: 10% 90% Ta = -25C to +75C VIN = 3 V, VON/OFF = 3 V 0 V IOUT = -15 mA, VOUT: 90% 10% Ta = -25C to +75C COUT 0.1 F, VIN = 3.0 V IOUT = -1 A to -15 mA Ta = -25C to +75C
Reference value 2.50 to 2.8 400 to 800 100 to 350 to 200 20 to 20 to 18 to to 10
Unit V A mV A dB dB dB s
Output voltage fall time
tf
to 500
s
Oscillation frequency margin
Gf
Without abnormal oscillation.
SDM00008AEB
3
AN1281SSM
I Application Notes
* PD Ta curves of SSMINI-5D package PD T a
0.200 Independent IC without a heat sink Rth(j-a) = 833.3C/W
0.150
Power dissipation PD (W)
0.120 0.100
0.050
0.000 0 25 50 75 100 125
* Main characteristics Output voltage rise time
Input voltage (V)
Ambient temperature Ta (C)
Ripple rejection ratio Frequency
0 -10
3 2 1
Ripple rejection ratio (dB)
-20 -30 -40
Output voltage (V)
ch.1 GND 2 1
ch.2 GND
0
200
400
600
800
1 000
1 200
500 1k
10k
100k
1M
Time (s)
Frequency (Hz)
Measurement circuit AN1281SSM VOUT 0.1 F 180 SW CF 1 F GND 4.7F VIN
4
SDM00008AEB
AN1281SSM
I New Package Dimensions (Unit: mm)
* SSMINI-5DA (Lead-free package) 0.20
0.20+0.10 -0.05 5 4 0.10 M
1.600.10 1.200.10
0.20
1
2
3
0.50 0.50 1.000.10 1.600.10
0.60 max. 0 to 0.10
0.10 1 2 3
Seating plane
5
4
0.08+0.10 -0.05
SDM00008AEB
5
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2001 MAR

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