February 2006 1 M9999-022706
MIC861 Micrel, Inc.
MIC861
Teeny™ Ultra Low Power Op Amp
General Description
The MIC861 is a rail-to-rail output, input common-mode to
ground, operational amplifier in Teeny™ SC70 packaging.
The MIC861 provides 400kHz gain-bandwidth product while
consuming an incredibly low 4.6µA supply current.
The SC70 packaging achieves significant board space savings
over devices packaged in SOT-23 or MSOP-8 packaging.
The SC70 occupies approximately half the board area of a
SOT-23 package.
Features
• Teeny™ SC70 packaging
• 400kHz gain-bandwidth product
• 650kHz, –3dB bandwidth
• 4.6µA supply current
• Rail-to-Rail output
• Ground sensing at input (common mode to GND)
• Drives large capactive loads (1000pF)
• Unity gain stable
Applications
• Portable equipment
• PDAs
• Pagers
• Cordless Phones
• Consumer Electronics
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Teeny is a trademark of Micrel, Inc.
Pin Configuration
OUT V+
IN− IN+
13
4 5
2
V−
A33
Part
Identification
SC-70
Functional Pinout
OUT V+
IN− IN+
13
4 5
2
V−
Ordering Information
Part Number Ambient
Temp. Range Package
Standard Marking Pb-Free Marking*
MIC861BC5 A33 MIC861YC5 A33 –40ºC to +85ºC SC-70-5
* Underbar marking may not be to scale.
MIC861 Micrel, Inc.
M9999-022706 2 February 2006
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ – V–) ..........................................+6.0V
Differentail Input Voltage (VIN+ – VIN–), Note 4 ...... +6.0V
Input Voltage (VIN+ – VIN–) ...................V+ + 0.3V, V– –0.3V
Lead Temperature (soldering, 5 sec.) ........................ 260°C
Output Short Circuit Current Duration ...................Indefinite
Storage Temperature (TS) ......................................... 150°C
ESD Rating, Note 3
Operating Ratings (Note 2)
Supply Voltage (V+ – V–) ........................ +2.43V to +5.25V
Ambient Temperature Range ...................... –40°C to +85°C
Package Thermal Resistance ................................ 450°C/W
Electrical Characteristics
V+ = +2.7V, V– = 0V, VCM = V+/2; RL= 500kΩ to V+/2; TA= 25°C, unless otherwise noted. Bold values indicate –40°C≤ TA≤ +85°C.
Symbol Parameter Condition Min Typ Max Units
VOS Input Offset Voltage Note 5 –10 2 10 mV
Input Offset Voltage Temp Coefficient
15 µV/°C
IB Input Bias Current 20 pA
IOS Input Offset Current 10 pA
VCM Input Voltage Range CMRR > 60dB 1.8 V
CMRR Common-Mode Rejection Ratio 0 < VCM < 1.35V 45 77 dB
PSRR Power Supply Rejection Ratio Supply voltage change of 3V 50 83 dB
AVOL Large-Signal Voltage Gain RL = 100k, VOUT 2V peak to peak 60 74 dB
RL = 500k, VOUT 2V peak to peak 73 83 dB
VOUT Maximum Output Voltage Swing RL = 500k
V+–2mV V+–0.7mV
V
VOUT Minimum Output Voltage Swing RL = 500k
V–+0.2mV V–+ 2mV
V
GBW Gain-Bandwidth Product RL = 200kΩ, CL = 2pF, VOUT = 0 350 kHz
BW –3dB Bandwidth AV = 1, CL = 2pF, RL = 1MΩ 500 kHz
SR Slew Rate AV = 1, CL = 2pF, RL = 1MΩ 0.12 V/µs
ISC Short-Circuit Output Current Source 6 mA
Sink 5 mA
IS Supply Current No Load 4.2 9 µA
V+= +5V, V–= 0V, VCM= V+/2; RL= 500kΩ to V+/2; TA= 25°C, unless otherwise noted. Bold values indicate –40°C≤ TA≤ +85°C.
VOS Input Offset Voltage Note 5 –10 2 10 mV
Input Offset Voltage Temp Coefficient
15 µV/°C
IB Input Bias Current 20 pA
IOS Input Offset Current 10 pA
VCM Input Voltage Range CMRR > 60dB 4.2 V
CMRR Common-Mode Rejection Ratio 0 < VCM < 3.5V 60 80 dB
PSRR Power Supply Rejection Ratio Supply voltage change of 1V 45 85 dB
AVOL Large-Signal Voltage Gain RL = 100k, VOUT 4.0V peak to peak 60 76 dB
RL = 500k, VOUT 4.0V peak to peak 68 83 dB
VOUT Maximum Output Voltage Swing RL = 500k
V+–2mV V+–0.7mV
V
VOUT Minimum Output Voltage Swing RL = 500k
V–+0.7mV V–+ 2mV
V
GBW Gain-Bandwidth Product RL = 200kΩ, CL = 2pF, VOUT = 0 400 kHz
BW –3dB Bandwidth AV = 1, CL = 2pF, RL = 1MΩ 650 kHz
February 2006 3 M9999-022706
MIC861 Micrel, Inc.
Symbol Parameter Condition Min Typ Max Units
SR Slew Rate AV = 1, CL = 2pF, RL = 1MΩ 0.12 V/µs
ISC Short-Circuit Output Current Source 10 24 mA
Sink 10 24 mA
IS Supply Current No Load 4.6 9 µA
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Pin 4 is ESD sensetive
Note 4. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is
likely to increase.
Note 5. The offset voltage distribution is centered around 0V. The typical offset number shown, is equal to the standard deviation of the voltage offset
distribution.
MIC861 Micrel, Inc.
M9999-022706 4 February 2006
Test Circuits
Test Circuit 1. AV= 11 Test Circuit 2:AV= 2
Test Circuit 3. AV= 1
170k
48k
10k 10k
10µF
0.1µF
10µF
50Ω
50Ω
100µF
0.1µF
10µF
100µF
All resistors:
1% metal film
Output
Input
V+
V—
MIC861
BNC
BNC
Test Circuit 5. Positive Power Supply Rejection Ratio Measurement
Test Circuit 4. AV= –1
February 2006 5 M9999-022706
MIC861 Micrel, Inc.
DC Performance Characteristics
0
1
2
3
4
5
0 5 10 15 20 25 30
OUTPUT CURRENT (mA)
Output Voltage vs.
Output Current
85°C
25°C
-40°C
Sinking
0
1
2
3
4
5
85°C 25°C
-40°C
Sourcing
0
5
10
15
20
25
30
0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
SUPPLY VOLTAGE (±V)
Short Circuit Current vs.
Supply Voltage
85°C
25°C
-40°C
Sourcing
0
5
10
15
20
25
30
0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
SUPPLY VOLTAGE (±V)
Short Circuit Current vs.
Supply Voltage
85°C
25°C
-40°C
Sinking
0.5
0.6
0.7
0.8
0.9
1
1.1
0 0.5 1 1.5 2 2.5
COMMON-MODE VOLTAGE (V)
Offset Voltage vs.
Common-Mode Voltage
85°C
–40°C
25°C
V+ = 2.7V
0.5
0.6
0.7
0.8
0.9
1
1.1
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
COMMON-MODE VOLTAGE (V)
Offset Voltage vs.
Common-Mode Voltage
–40°C
25°C
V+ = 5V
0
1
2
3
4
5
6
7
8
9
0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
SUPPLY VOLTAGE (V)
Offset Voltage vs.
Supply Voltage
85°C
25°C
-40°C
0
20
40
60
80
100
0.1 1 10 100 1000 10000
RESISTIVE LOAD (kΩ)
Open Loop Gain vs.
Resistive Load
V+ = 5V
V+ = 2.7V
-6
-5
-4
-3
-2
-1
0
-40 -20 0 20 40 60 80 100
TEMPERATURE ( °C)
Offset Voltage vs.
Temperature
5V
2.7V
0
1
2
3
4
5
6
7
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Supply Current vs.
Temperature
5V
2.7V
0
5
10
15
20
25
30
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
5V
2.7V
Sourcing
-30
-25
-20
-15
-10
-5
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
5V
2.7V
Sinking
0
OUTPUT CURRENT (mA)
-5 -10 -15 -20 -25 -30 -35 -40
Output Voltage vs.
Output Current
MIC861 Micrel, Inc.
M9999-022706 6 February 2006
AC Perfomance Characteristics
Gain Bandwidth
and Phase Margin
1k 10k 100k 1M -225
-180
-135
-90
-45
0
45
90
135
180
225
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Av = 11
V+ = 2.5V
V– = –2.5V
CL = 2pF
RF = 200kΩ
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Gain Bandwidth
and Phase Margin
1k 10k 100k 1M
Av = 11
V+ = 1.35V
V- = –1.35V
C
L
= 2pF
R
F
= 200kΩ
-225
-180
-135
-90
-45
0
45
90
135
180
225
25
75
125
175
225
275
325
375
425
1 10 100 1000
CAPACITIVE LOAD (pF)
Gain Bandwidth vs.
Capacitive Load
5V
2.7V
-10
0
10
20
30
40
50
60
70
80
90
FREQUENCY (Hz)
PSRR vs.
Frequency
100k
110 100 1k 10k 1M
V+ = 5V
0
10
20
30
40
50
60
70
80
90
FREQUENCY (Hz)
CMRR vs.
Frequency
100k
110 100 1k 10k 1M
V+= 5V
-20
0
20
40
60
80
100
FREQUENCY (Hz)
PSRR vs.
Frequency
1 10 100 1k 10k 100k 1M
V+ = 2.7V
0
20
40
60
80
100
FREQUENCY (Hz)
CMRR vs.
Frequency
1 10 100 1k 10k 100k 1M
V+ = 2.7V
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Gain Bandwidth
and Phase Margin
1k 10k 100k 1M
Av = 2
V+ = 2.5V
V- = –2.5V
CL = 2pF
RF = 20kΩ
-225
-180
-135
-90
-45
0
45
90
135
180
225
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Gain Frequency Response
1k 10k 100k 1M
Av = 2
V+ = 1.35V
V- = –1.35V
CL = 2pF
RF = 20kΩ
-225
-180
-135
-90
-45
0
45
90
135
180
225
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Unity Gain
Frequency Response
1k 10k 100k 1M
Av = 1
V+ = 2.5V
V– = –2.5V
RL = 1MΩ
-225
-180
-135
-90
-45
0
45
90
135
180
225
-50
-40
-30
-20
-10
0
10
20
30
40
50
FREQUENCY (Hz)
Unity Gain
Frequency Response
1k 10k 100k 1M
Av = 1
V+ = 1.35V
V– = –1.35V
RL = 1MkΩ
-225
-180
-135
-90
-45
0
45
90
135
180
225
February 2006 7 M9999-022706
MIC861 Micrel, Inc.
Close-loop Unity Gain Frequency Response
FREQUENCY (Hz)
1µF
0.1µF 0.01µF
1000pF
100pF
3pF
0
-3
-6
100 1k 10k 100k 1M 10M
3
6
9
12
15
18 AV = 1
V+ = 2.5V
V- = -2.5V
CL
RF
FET Probe
V+
V−
MIC861 Micrel, Inc.
M9999-022706 8 February 2006
Small Signal Pulse Response
Test Circuit 4: AV = -1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = -1
V+ = 2.5V
V- = -2.5V
CL = 2pF
RL = 5kΩ
RF = 20kΩ
Small Signal Pulse Response
Test Circuit 4: AV = -1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = -1
V+ = 1.35V
V- = -1.35V
CL = 2pF
RL = 5kΩ
RF = 20kΩ
Small Signal Pulse Response
Test Circuit 3: AV = 1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = 1
V+ = 1.35V
V- = -1.35V
CL = 2pF
RL = 1MΩ
Small Signal Pulse Response
Test Circuit 3: AV = 1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = 1
V+ = 2.5V
V- = -2.5V
CL = 2pF
RL = 1MΩ
Small Signal Pulse Response
Test Circuit 3: AV = 1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = 1
V+ = 1.35V
V- = -1.35V
CL = 50pF
RL = 1MΩ
Small Signal Pulse Response
Test Circuit 3: AV = 1
TIME 250ms/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = 1
V+ = 2.5V
V- = -2.5V
CL = 50pF
RL = 1MΩ
Functional Characteristics
February 2006 9 M9999-022706
MIC861 Micrel, Inc.
Small Signal Pulse Response
Test Circuit 4: AV = -1
TIME 10µs/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = -1
V+ = 2.5V
V- = -2.5V
CL = 2pF
RL = 1MΩ
RF = 20kΩ
Rail to Rail Output Operation
TIME 250µs/div
OUTPUT
2V/div
INPUT
2V/div
AV = 2
V+ = 2.5V
V- = -2.5V
CL = 2pF
RL = 1MΩ
RF = 20kΩ
∆VPP = 5V
Rail to Rail Output Operation
TIME 250µs/div
OUTPUT
2V/div
INPUT
2V/div
AV = 2
V+ = 2.5V
V- = -2.5V
CL = 2pF
RL = 5kΩ
RF = 20kΩ
∆VPP = 5V
Rail to Rail Output Operation
TIME 250µs/div
OUTPUT
2V/div
INPUT
2V/div
AV = 2
V+ = 1.35V
V- = -1.35V
CL = 2pF
RL = 1MΩ
RF = 20kΩ
∆VPP = 2.7V
Rail to Rail Output Operation
TIME 250µs/div
OUTPUT
1V/div
INPUT
1V/div
AV = 2
V+ = 1.35V
V- = -1.35V
CL = 2pF
RL = 5kΩ
RF = 20kΩ
∆VPP = 2.7V
Small Signal Pulse Response
Test Circuit 4: AV = -1
TIME 10ms/div
OUTPUT
50mV/div
INPUT
50mV/div
AV = -1
V+ = 1.35V
V- = -1.35V
CL = 2pF
RL = 1MΩ
RF = 20kΩ
MIC861 Micrel, Inc.
M9999-022706 10 February 2006
Large Signal Pulse Response
Test Circuit 3: AV = 1
TIME 10µs/div
OUTPUT
500mV/div
AV = 1
V+ = 1.35V
V- = -1.35V
CL = 100pF
RL = 5kΩ
Positive Slew Rate = 0.14V/µs
Negative Slew Rate = 0.22V/µs
Large Signal Pulse Response
Test Circuit 3: AV = 1
TIME 10µs/div
OUTPUT
500mV/div
AV = 1
V+ = 2.5V
V- = -2.5V
CL = 100pF
RL = 5kΩ
Positive Slew Rate = 0.13V/µs
Negative Slew Rate = 0.18V/µs
February 2006 11 M9999-022706
MIC861 Micrel, Inc.
Applications Information
Power Supply Bypassing
Regular supply bypassing techniques are recommended.
A 10µF capacitor in parallel with a 0.1µF capacitor on both
the positive and negative supplies are ideal. For best perfor-
mance all bypassing capacitors should be located as close
to the op amp as possible and all capacitors should be low
ESL (equivalent series inductance), ESR (equivalent series
resistance). Surface-mount ceramic capacitors are ideal.
MIC861 Micrel, Inc.
M9999-022706 12 February 2006
Package Information
SC70-5
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2002 Micrel, Inc.