Datasheet

MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
SGND to PGND .....................................................-0.3V to +0.3V
V
DD
to SGND or PGND ............................................-0.3V to +2V
V
SS
to PV
SS
...........................................................-0.3V to +0.3V
C1P to PGND..............................................-0.3V to (V
DD
+ 0.3V)
C1N to PGND............................................(PV
SS
- 0.3V) to +0.3V
V
SS
, PV
SS
to GND ....................................................+0.3V to -2V
OUTR, OUTL, INR, INL to SGND
(MAX9725A–MAX9725D)..............(V
SS
- 0.3V) to (V
DD
+ 0.3V)
OUTR, OUTL to SGND
(MAX9725E) ..................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
INR, INL to SGND (MAX9725E)...................................-4V to +4V
SHDN to SGND or PGND.........................................-0.3V to +4V
Output Short-Circuit Current ......................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
12-Bump UCSP (derate 6.5mW/°C above +70°C)....518.8mW
12-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349.1mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+230°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS (MAX9725A–MAX9725D)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= ∞, T
A
= T
MIN
to T
MAX,
unless other-
wise noted. Typical values are at T
A
= +25°C.) (See the Functional Diagrams. ) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Guaranteed by PSRR test 0.9 1.8 V
Quiescent Supply Current I
DD
Both channels active 2.1 3.3 mA
T
A
= +25°C 0.6 10
Shutdown Current I
SHDN
V
SHDN
= 0V
T
A
= -40°C to +85°C30
µA
Shutdown to Full Operation t
ON
180 µs
V
IH
V
DD
= 0.9V to 1.8V 0.7 x V
DD
SHDN Thresholds
V
IL
V
DD
= 0.9V to 1.8V 0.3 x V
DD
V
SHDN Input Leakage Current I
LEAK
V
DD
= 0.9V to 1.8V (Note 2) ±1µA
CHARGE PUMP
Oscillator Frequency f
OSC
493 580 667 kHz
AMPLIFIERS
MAX9725A -2.04 -2.00 -1.96
MAX9725B -1.53 -1.5 -1.47
MAX9725C -1.02 -1.00 -0.98
Voltage Gain A
V
MAX9725D -4.08 -4.00 -3.92
V/V
Gain Match ΔA
V
±0.5 %
MAX9725A/MAX9725D ±0.3 ±1.05
MAX9725B ±0.45 ±1.58Total Output Offset Voltage V
OS
Input AC-coupled,
R
L
= 32Ω to GND,
T
A
= +25°C
MAX9725C ±0.6 ±2.1
mV
Input Resistance R
IN
15 25 35 kΩ
V
DD
= 0.9V to 1.8V, T
A
= +25°C6080
f
IN
= 1kHz 70Power-Supply Rejection Ratio PSRR
100mV
P-P
ripple
f
IN
= 20kHz 62
dB
R
L
= 32Ω 10 20
V
DD
= 1.5V
R
L
= 16Ω 25
V
DD
= 1.0V, R
L
= 32Ω 7
Output Power (Note 3) P
OUT
V
DD
= 0.9V, R
L
= 32Ω 6
mW