MAX44265EWT+ [MAXIM]

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP; 轨到轨, 200kHz的运算放大器,带有关断,采用微型, 6焊球WLP封装
MAX44265EWT+
型号: MAX44265EWT+
厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述:

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP
轨到轨, 200kHz的运算放大器,带有关断,采用微型, 6焊球WLP封装

运算放大器 放大器电路 信息通信管理
文件: 总13页 (文件大小:360K)
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19-5709; Rev 0; 12/10  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
General Description  
Features  
The MAX44265 op amp features a maximized ratio of  
gain bandwidth (GBW) to supply current and is ideal for  
battery-powered applications such as handsets,  
tablets, notebooks, and portable medical equipment.  
This CMOS op amp features an ultra-low input-bias cur-  
rent of 1pA, rail-to- rail input and output, low supply cur-  
rent of 4µA, and operates from a single 1.8V to 5.5V  
supply. For additional power conservation, the IC also  
features a low-power shutdown mode that reduces sup-  
ply current to 1nA and puts the amplifier’s outputs in a  
high-impedance state. This device is unity-gain stable  
with a 200kHz GBW product.  
200kHz GBW  
Ultra-Low 4µA Supply Current  
Single 1.8V to 5.5V Supply Voltage Range  
Ultra-Low 1pA Input Bias Current  
Rail-to-Rail Input and Output Voltage Ranges  
Low 200µV Input Offset Voltage  
Low 0.001µA Shutdown Current  
High-Impedance Output During Shutdown  
Unity-Gain Stable  
It is available in a space-saving, 0.9mm x 1.3mm,  
6-bump WLP package and is specified over the -40°C  
to +85°C extended operating temperature range.  
Available in a Tiny, 0.9mm x 1.3mm, 6-Bump WLP  
Package  
Applications  
Ordering Information  
Cell Phones  
PIN-  
PACKAGE  
TOP  
MARK  
PART  
TEMP RANGE  
Tablet/Notebook Computers  
Mobile Accessories  
Battery-Powered Devices  
MAX44265EWT+ -40°C to +85°C  
6 WLP  
+BY  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
ABSOLUTE MAXIMUM RATINGS  
Power-Supply Voltage (V  
to V )......................-0.3V to +6.0V  
Operating Temperature Range .......................... -40°C to +85°C  
Junction Temperature .....................................................+150°C  
Storage Temperature Range ............................-65°C to +150°C  
Soldering Temperature (reflow) .......................................+260°C  
DD  
SS  
IN_+, IN_-, OUT_, SHDN_............... (V - 0.3V) to (V  
+ 0.3V)  
SS  
DD  
Current into IN_+, IN_-......................................................±20mA  
Output Short-Circuit Duration to V or V ..............Continuous  
DD  
SS  
Continuous Power Dissipation (T = +70°C)  
A
6-Bump WLP (derate 10.5mW/°C above +70°C).........840mW  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional  
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to  
absolute maximum rating conditions for extended periods may affect device reliability.  
MAX4265  
ELECTRICAL CHARACTERISTICS  
(V  
= 1.8V to 5.5V, V = 0V, V  
= 0V, V  
= V /2, R = connected to V /2, SHDN_ = V , T = +25°C, unless otherwise  
DD  
SS  
CM  
OUT DD L DD DD A  
noted.) (Note 1)  
PARAMETER  
SYMBOL  
CONDITIONS  
Guaranteed by PSRR test  
MIN  
TYP  
MAX  
UNITS  
Supply Voltage Range  
Supply Current  
V
1.8  
5.5  
V
DD  
V
V
= 1.8V  
= 5.5V  
4
4
DD  
DD  
I
µA  
DD  
5.0  
0.5  
±1  
Shutdown Supply Current  
Input Offset Voltage  
Input Bias Current  
I
SHDN_ = GND  
0.001  
±0.2  
±1  
µA  
mV  
pA  
pA  
DD(SHDN_)  
V
OS  
I
(Note 2)  
±10  
±10  
B
Input Offset Current  
I
(Note 2)  
±1  
OS  
Common mode  
1
Input Resistance  
R
G  
IN  
Differential mode, -1mV < V < +1mV  
IN  
10  
V
0.1  
-
V
+
DD  
0.1  
SS  
Input Common-Mode Range  
V
Guaranteed by CMRR test  
V
CM  
Common-Mode Rejection Ratio  
Power-Supply Rejection Ratio  
CMRR  
PSRR  
-0.1V < V  
< V  
+ 0.1V, V = 5.5V  
DD  
70  
65  
80  
95  
dB  
dB  
CM  
DD  
1.8V < V  
< 5.5V  
DD  
25mV < V  
R = 100k, V  
L
< V  
- 25mV,  
DD  
OUT  
95  
95  
120  
110  
= 5.5V  
DD  
Open-Loop Gain  
A
dB  
VOL  
100mV < V  
R = 5k, V  
L
< V  
- 100mV,  
OUT  
DD  
= 5.5V  
DD  
R = 100kΩ  
2.5  
50  
5
L
Output-Voltage-Swing High  
V
V
V
- V  
R = 5kΩ  
L
70  
mV  
OH  
DD  
OUT  
R = 1kΩ  
250  
2.5  
50  
L
R = 100kΩ  
L
5
Output-Voltage-Swing Low  
Output Short-Circuit Current  
V
- V  
SS  
mV  
mA  
R = 5kΩ  
L
70  
OL  
OUT  
R = 1kΩ  
L
250  
±15  
I
OUT(SC)  
2
_______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
DD  
= 1.8V to 5.5V, V = 0V, V  
= 0V, V = V /2, R = connected to V /2, SHDN_ = V , T = +25°C, unless otherwise  
OUT DD L DD DD A  
SS  
CM  
noted.) (Note 1)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
0.4  
UNITS  
V
V
V
V
= 1.8V to 3.6V  
= 3.6V to 5.5V  
= 1.8V to 3.6V  
= 3.6V to 5.5V  
DD  
DD  
DD  
DD  
SHDN_ Logic Low  
V
V
IL  
0.8  
1.4  
2
SHDN_ Logic High  
V
V
IH  
I
SHDN_ = V (Note 2)  
1
IL  
SS  
SHDN_ Input Bias Current  
nA  
I
IH  
SHDN_ = V  
500  
500  
DD  
Output Leakage in Shutdown  
Gain-Bandwidth Product  
Slew Rate  
I
SHDN_ = V , V  
= 0V to V  
DD  
1
200  
0.1  
nA  
kHz  
V/µs  
OUT(SHDN_)  
SS OUT  
A = 1V/V  
30  
V
Capacitive-Load Stability (See  
the Driving Capacitive Loads  
Section)  
A = 10V/V  
V
250  
200  
100  
400  
0.001  
18  
No sustained  
oscillations  
C
pF  
LOAD  
R = 5k, A = 1V/V  
L
V
R
ISO  
= 1k, A = 1V/V  
V
Input Voltage-Noise Density  
Input Current-Noise Density  
Settling Time  
f = 1kHz  
f = 1kHz  
nV/Hz  
pA/Hz  
µs  
To 0.1%, V  
= 2V step, A = -1V/V  
V
OUT  
I
V
= 5% of normal operation,  
DD  
Delay Time to Shutdown  
t
t
2
µs  
SH  
EN  
= 5.5V, V  
= 5.5V to 0 step  
DD  
SHDN_  
V
V
= 2.7V, V  
OUT  
settles to 0.1%,  
OUT  
Delay Time to Enable  
Power-Up Time  
30  
5
µs  
µs  
= 5.5V, V  
= 0 to 5.5V step  
DD  
SHDN_  
V
= 0 to 5.5V step  
DD  
ELECTRICAL CHARACTERISTICS  
(V  
= 1.8V to 5.5V, V = 0V, V  
= 0V, V  
= V /2, R = connected to V /2, SHDN_ = V , T = -40°C to +85°C, unless  
OUT DD L DD DD A  
DD  
SS  
CM  
otherwise noted.) (Note 1)  
PARAMETER  
Supply Voltage Range  
Supply Current  
SYMBOL  
CONDITIONS  
Guaranteed by PSRR test  
= 5.5V  
MIN  
TYP  
MAX  
5.5  
5.5  
1
UNITS  
V
V
1.8  
DD  
DD  
I
V
µA  
DD  
Shutdown Supply Current  
Input Offset Voltage  
I
SHDN_ = GND  
µA  
DD(SHDN_)  
V
±5  
mV  
OS  
Input-Offset-Voltage  
Temperature Coefficient  
TC  
±5  
µV/°C  
VOS  
_______________________________________________________________________________________  
3
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
= 1.8V to 5.5V, V = 0V, V  
= 0V, V  
= V /2, R = connected to V /2, SHDN_ = V , T = -40°C to +85°C, unless  
OUT DD L DD DD A  
DD  
SS  
CM  
otherwise noted.) (Note 1)  
PARAMETER  
Input Bias Current  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
±30  
UNITS  
pA  
I
B
Input Offset Current  
I
±20  
pA  
OS  
V
0.05  
-
V
0.05  
+
DD  
SS  
Input Common-Mode Range  
V
Guaranteed by CMRR test  
V
CM  
MAX4265  
Common-Mode Rejection Ratio  
Power-Supply Rejection Ratio  
CMRR  
PSRR  
-0.05V < V  
< V  
+ 0.05V, V  
- 25mV,  
DD  
= 5.5V  
60  
dB  
dB  
CM  
DD  
DD  
1.8V < V  
< 5.5V  
59  
DD  
25mV < V  
< V  
DD  
OUT  
85  
80  
R = 100k, V  
L
= 5.5V  
Open-Loop Gain  
A
dB  
VOL  
150mV < V  
R = 5k, V  
L
< V  
- 150mV,  
OUT  
DD  
= 5.5V  
DD  
R = 100kΩ  
5
L
Output-Voltage-Swing High  
Output-Voltage-Swing Low  
SHDN_ Logic Low  
V
V
V
- V  
OUT  
mV  
mV  
V
OH  
DD  
R = 5kΩ  
L
90  
5
R = 100kΩ  
L
V
- V  
SS  
OL  
OUT  
R = 5kΩ  
L
90  
0.4  
0.8  
V
V
V
V
= 1.8V to 3.6V  
= 3.6V to 5.5V  
= 1.8V to 3.6V  
= 3.6V to 5.5V  
DD  
DD  
DD  
DD  
V
IL  
1.4  
2
SHDN_ Logic High  
V
V
IH  
I
SHDN_ = V  
SHDN_ = V  
5
nA  
nA  
nA  
IL  
SS  
SHDN_ Input-Bias Current  
I
IH  
1000  
1000  
DD  
Output Leakage in Shutdown  
I
SHDN_ = V , V  
= 0V to V  
OUT(SHDN_)  
SS OUT DD  
Note 1: Specifications are 100% tested at T = +25°C (exceptions noted). All temperature limits are guaranteed by design.  
A
Note 2: Guaranteed by design, not production tested.  
4
_______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
Typical Operating Characteristics  
(V  
= 3V, V = V  
= 0V, R to V /2, T = +25°C, unless otherwise noted.)  
CM L DD A  
DD  
SS  
SHUTDOWN SUPPLY CURRENT  
vs. TEMPERATURE  
INPUT OFFSET VOLTAGE  
vs. INPUT COMMON-MODE VOLTAGE  
SUPPLY CURRENT  
vs. SUPPLY VOLTAGE  
12  
10  
8
1000  
750  
9
8
7
6
5
4
3
2
1
500  
T
A
= -40°C  
250  
T
A
= +25°C  
6
0
T
= -40°C  
A
T
= +25°C  
A
-250  
-500  
-750  
-1000  
4
T
A
= +85°C  
2
T
= +85°C  
A
0
-40  
-15  
10  
35  
60  
85  
0
0.5  
1.0  
1.5  
(V)  
2.0  
2.5  
3.0  
1.8  
2.6  
3.4  
4.2  
5.0 5.5  
TEMPERATURE (°C)  
V
V
(V)  
CM  
SUPPLY  
INPUT OFFSET VOLTAGE  
vs. TEMPERATURE  
INPUT BIAS CURRENT  
vs. TEMPERATURE  
INPUT BIAS CURRENT  
vs. INPUT COMMON-MODE VOLTAGE  
200  
7
6
5
4
150  
100  
50  
5
3
4
2
0
I -  
B
3
1
-50  
2
0
-100  
-150  
-200  
-250  
-300  
-350  
1
-1  
-2  
-3  
-4  
-5  
0
I +  
B
-1  
-2  
-3  
-40  
-15  
10  
35  
60  
85  
-40  
-15  
10  
35  
60  
85  
-0.5  
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
V
CM  
(V)  
COMMON-MODE REJECTION RATIO  
vs. TEMPERATURE  
COMMON-MODE REJECTION RATIO  
vs. FREQUENCY  
POWER-SUPPLY REJECTION RATIO  
vs. FREQUENCY  
140  
120  
100  
80  
0
-10  
-20  
-30  
-40  
-50  
-60  
-70  
-80  
-90  
-100  
0
-20  
-40  
-60  
60  
-80  
40  
-100  
-120  
20  
0
-40  
-15  
10  
35  
60  
85  
1
10  
100  
1k  
10k  
100k  
0.1  
1
10  
100  
1k  
10k  
TEMPERATURE (°C)  
FREQUENCY (Hz)  
FREQUENCY (Hz)  
_______________________________________________________________________________________  
5
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
Typical Operating Characteristics (continued)  
(V  
= 3V, V = V  
= 0V, R to V /2, T = +25°C, unless otherwise noted.)  
DD  
SS  
CM  
L
DD  
A
SLEW RATE  
vs. SUPPLY VOLTAGE  
OUTPUT-SWING LOW  
vs. TEMPERATURE  
OUTPUT-SWING HIGH  
vs. TEMPERATURE  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
10000  
1000  
100  
10  
1000  
100  
10  
V
= V - V  
OL  
OUT SS  
DD  
R TO V  
L
R = 1k  
L
R = 1kΩ  
L
R = 5kΩ  
MAX4265  
L
R = 5kΩ  
L
R = 100kΩ  
L
-0.1  
-0.2  
-0.3  
-0.4  
R = 100kΩ  
L
R TO V  
L
SS  
V
OH  
= V - V  
DD OUT  
1
1
1.8  
2.6  
3.4  
4.2  
5.0 5.5  
-40  
-15  
10  
35  
60  
85  
-40  
-15  
10  
35  
60  
85  
SUPPLY VOLTAGE (V)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
OPEN-LOOP GAIN  
OPEN-LOOP GAIN  
GAIN AND PHASE  
vs. TEMPERATURE (R TO V  
)
SS  
vs. TEMPERATURE (R TO V  
)
DD  
vs. FREQUENCY (R = , C  
= 15pF)  
LOAD  
MAX44265 toc15  
L
L
L
140  
120  
100  
80  
80  
60  
180  
135  
90  
140  
120  
100  
80  
A
= 1000V/V  
V
R = 100kΩ  
R = 100kΩ  
L
L
GAIN  
40  
R = 5kΩ  
L
R = 5kΩ  
20  
45  
L
PHASE  
0
0
R = 1kΩ  
L
R = 1kΩ  
L
60  
60  
-20  
-40  
-60  
-80  
-45  
-90  
-135  
-180  
40  
40  
20  
20  
0
0
-40  
-15  
10  
35  
60  
85  
1
10  
100  
1k  
10k  
100k  
1M  
-40  
-15  
10  
35  
60  
85  
TEMPERATURE (°C)  
FREQUENCY (Hz)  
TEMPERATURE (°C)  
TOTAL HARMONIC DISTORTION  
PLUS NOISE vs. FREQUENCY  
GAIN AND PHASE  
vs. FREQUENCY (R = 5k, C  
= 100pF)  
L
LOAD  
MAX44265 toc16  
-5  
-15  
-25  
-35  
-45  
-55  
-65  
-75  
-85  
-95  
100  
225  
180  
135  
90  
A
= 1000V/V  
V
80  
GAIN  
60  
40  
20  
0
45  
PHASE  
0
-45  
-20  
-90  
-40  
-135  
V
OUT  
= 2V  
P-P  
-60  
-80  
-180  
-225  
-100  
10  
100  
1k  
10k  
1
10  
100  
1k  
10k  
100k  
1M  
FREQUENCY (Hz)  
FREQUENCY (Hz)  
6
_______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
Typical Operating Characteristics (continued)  
(V  
= 3V, V = V  
= 0V, R to V /2, T = +25°C, unless otherwise noted.)  
CM L DD A  
DD  
SS  
VOLTAGE-NOISE DENSITY  
vs. FREQUENCY  
RESISTOR ISOLATION  
vs. CAPACITIVE LOAD  
POWER-UP SETTLING TIME  
MAX44265 toc20  
10,000  
1000  
100  
8000  
7000  
6000  
5000  
4000  
3000  
2000  
1000  
0
A
V
= 1V/V  
FOR A = 10V/V  
V
NO R NEEDED  
ISO  
V
DD  
1V/div  
OUTPUT  
500mV/div  
1
10  
100  
1k  
10k  
100k  
500ns/div  
10  
100  
1000  
10,000  
FREQUENCY (Hz)  
C
(pF)  
LOAD  
SMALL-SIGNAL PULSE RESPONSE  
(C = 15pF)  
SMALL-SIGNAL PULSE RESPONSE  
SHUTDOWN RESPONSE  
LOAD  
(C  
= 100pF)  
LOAD  
MAX44265 toc21  
MAX44265 toc22  
MAX44265 toc23  
IN+ = V / 2  
A
= 1V/V  
DD  
A
= 10V/V  
V
V
A
V
= 1V/V  
3V  
IN+  
50mV/div  
IN+  
5mV/div  
SHDN  
0V  
1.5V  
0V  
OUTPUT  
50mV/div  
OUTPUT  
50mV/div  
OUTPUT  
20µs/div  
10µs/div  
20µs/div  
LARGE-SIGNAL PULSE RESPONSE  
(C = 15pF)  
LARGE-SIGNAL PULSE RESPONSE  
(C = 100pF)  
LOAD  
LOAD  
MAX44265 toc24  
MAX44265 toc25  
A
= 1V/V  
A
= 10V/V  
V
V
IN+  
IN+  
1V/div  
100mV/div  
OUTPUT  
1V/div  
OUTPUT  
1V/div  
10µs/div  
100µs/div  
_______________________________________________________________________________________  
7
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
Typical Operating Characteristics (continued)  
(V  
= 3V, V = V  
SS  
= 0V, R to V /2, T = +25°C, unless otherwise noted.)  
CM L DD A  
DD  
LARGE-SIGNAL GAIN  
vs. FREQUENCY  
SMALL-SIGNAL GAIN  
vs. FREQUENCY  
4
10  
8
A
V
C
= +1V/V  
P-P  
= 15pF  
V
OUT  
LOAD  
A
V
C
= +1V/V  
V
OUT  
LOAD  
= 2V  
= 100mV  
3
2
1
P-P  
= 15pF  
6
4
MAX4265  
2
0
-1  
-2  
-3  
-4  
0
-2  
-4  
-6  
-8  
-10  
1
10  
100  
1
10  
100  
1000  
FREQUENCY (kHz)  
FREQUENCY (kHz)  
OUTPUT WAVEFORM WITH R  
PERCENT OVERSHOOT  
vs. CAPACITIVE LOAD  
ISO  
(C  
= 100pF, R = 6.2k)  
ISO  
MAX44265 toc29  
LOAD  
4.0  
A
V
= 1V/V  
A
= 1V/V  
V
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
R = 1MΩ  
L
IN+  
50mV/div  
R = 100kΩ  
L
OUTPUT  
50mV/div  
R = 10kΩ  
L
20µs/div  
0
20  
40  
60  
80  
100  
C
(pF)  
LOAD  
OUTPUT WAVEFORM WITHOUT R  
ISO  
(C  
LOAD  
= 100pF)  
MAX44265 toc30  
A
= 1V/V  
V
IN+  
50mV/div  
OUTPUT  
50mV/div  
20µs/div  
8
_______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
Pin Configuration  
TOP VIEW  
MAX44265  
+
IN+  
A1  
V
SS  
A2  
IN-  
B1  
V
DD  
B2  
OUT  
C1  
SHDN  
C2  
WLP BUMP  
SIDE DOWN  
Pin Description  
PIN  
A1  
A2  
B1  
C1  
B2  
C2  
NAME  
FUNCTION  
IN+  
Noninverting Amplifier Input  
V
Negative Supply Voltage  
Inverting Amplifier Input  
Amplifier Output  
SS  
IN-  
OUT  
V
Positive Supply Voltage  
Shutdown  
DD  
SHDN  
_______________________________________________________________________________________  
9
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
Detailed Description  
Featuring a maximized ratio of GBW to supply current,  
RAIL-TO-RAIL OUTPUT VOLTAGE RANGE  
low operating supply voltage, low input bias current,  
and rail-to-rail inputs and outputs, the MAX44265 is an  
excellent choice for precision or general-purpose, low-  
current, low-voltage, battery-powered applications. This  
CMOS device consumes an ultra-low 4µA (typ) supply  
current and has a 200µV (typ) offset voltage. For addi-  
tional power conservation, the IC features a low-power  
shutdown mode that reduces supply current to 1nA  
(typ) and puts the amplifier’s output in a high-imped-  
ance state. This device is unity-gain stable with a  
200kHz GBW product, driving capacitive loads up to  
30pF. The capacitive load can be increased to 250pF  
when the amplifier is configured for a 10V/V gain.  
3V  
IN_  
1V/div  
0V  
3V  
MAX4265  
OUT_  
1V/div  
0V  
Rail-to-Rail Inputs and Outputs  
The IC has a parallel-connected n- and p-channel dif-  
ferential input stage that allows an input common-mode  
voltage range that extends 100mV beyond the positive  
and negative supply rails, with excellent common-mode  
rejection. The IC is capable of driving the output to  
within 5mV of both supply rails with a 100kload. This  
device can drive a 5kload with swings to within 60mV  
of the rails. Figure 1 shows the output voltage swing of  
the IC configured as a unity-gain buffer powered from a  
single 3V supply.  
200µs/div  
Figure 1. Rail-to-Rail Output Voltage Range  
Low Input Bias Current  
The IC features ultra-low 1pA (typ) input bias current.  
The variation in the input bias current is minimal with  
changes in the input voltage due to very high input  
impedance (in the order of 1G).  
R
ISO  
MAX44265  
R
C
L
L
Applications Information  
Driving Capacitive Loads  
The IC’s amplifier is unity-gain stable for loads up to  
30pF. However, the capacitive load can be increased  
to 250pF when the amplifier is configured for a mini-  
mum gain of 10V/V. Applications that require greater  
capacitive-drive capability should use an isolation  
resistor between the output and the capacitive load  
(Figure 2). Also, in unity-gain applications with relatively  
R
L
A =  
V
1V/V  
R + R  
L
ISO  
Figure 2. Using a Resistor to Isolate a Capacitive Load from  
the Op Amp  
small R (approximately 5k), the capacitive load can  
L
be increased up to 200pF.  
10 ______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
Power-Supply Considerations  
The IC is optimized for single 1.8V to 5.5V supply oper-  
5.5V  
ation. A high amplifier power-supply rejection ratio of  
95dB (typ) allows the devices to be powered directly  
from a battery, simplifying design and extending bat-  
tery life.  
0V  
IN-  
IN+  
V
DD  
100kΩ  
100kΩ  
Power-Up Settling Time  
The IC typically requires 5µs after power-up. Supply  
settling time depends on the supply voltage, the value  
of the bypass capacitor, the output impedance of the  
incoming supply, and any lead resistance or induc-  
tance between components. Op-amp settling time  
depends primarily on the output voltage and is slew-  
rate limited. Figure 3 shows MAX44265 in a noninvert-  
ing voltage follower configuration with the input held at  
midsupply. The output settles in approximately 18µs for  
OUT  
MAX44265  
V
SS  
Figure 3. Power-Up Test Configuration  
V
= 3V (see the Typical Operating Characteristics for  
DD  
power-up settling time).  
Power-Supply Bypassing and Layout  
with a 0.1µF capacitor  
Shutdown Mode  
To minimize noise, bypass V  
The IC features an active-low shutdown input. The  
device enters shutdown in 2µs (typ) and exit in 30µs  
(typ). The amplifier’s outputs are in a high-impedance  
state in shutdown mode. Drive SHDN low to enter shut-  
down. Drive SHDN high to enable the amplifier.  
DD  
to ground, as close to the pin as possible.  
Good layout techniques optimize performance  
by decreasing the amount of stray capacitance and  
inductance to the op amps’ inputs and outputs.  
Minimize stray capacitance and inductance by placing  
external components close to the IC.  
Chip Information  
PROCESS: BiCMOS  
______________________________________________________________________________________ 11  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
Package Information  
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the  
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the  
package regardless of RoHS status.  
LAND  
PATTERN NO.  
PACKAGE TYPE  
PACKAGE CODE  
OUTLINE NO.  
21-0217  
6 WLP  
W61B1+1  
MAX4265  
12 ______________________________________________________________________________________  
Rail-to-Rail, 200kHz Op Amp  
with Shutdown in a Tiny, 6-Bump WLP  
MAX4265  
Revision History  
REVISION REVISION  
PAGES  
DESCRIPTION  
CHANGED  
NUMBER  
DATE  
0
12/10  
Initial release  
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are  
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.  
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13  
© 2010 Maxim Integrated Products  
Maxim is a registered trademark of Maxim Integrated Products, Inc.  

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