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MAX8896EREE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX8896 dual step-down converter is optimized
for powering the power amplifier (PA) and RF transceiv-
er in WCDMA handsets. This device integrates a high-
efficiency PWM step-down converter (OUT1) for
medium and low-power transmission, and a 140mΩ
(typ) bypass FET to power the PA directly from the bat-
tery during high-power transmission. A second high-
efficiency PWM step-down converter (OUT2) supplies
power directly to a high PSRR, low output noise, 200mA
low-dropout linear regulator (LDO) to power the RF
transceiver.
Fast switching allows the use of small ceramic input and
output capacitors while maintaining low ripple voltage.
The feedback network is integrated reducing external
component count and total solution size. OUT1 uses an
analog input driven by an external DAC to control the
output voltage linearly for continuous PA power adjust-
ment. At high duty cycle, OUT1 automatically switches to
bypass mode, connecting the input to the output through
a low-impedance (140mΩ, typ) MOSFET.
OUT2 is a 2MHz fixed-frequency, step-down converter
capable of operating at 100% duty cycle. Output accu-
racy is ±2% over load, line, and temperature. The out-
put of OUT2 is preset to 3.1V to provide power to a
200mA, 2.8V LDO designed for low noise (16µV
RMS
,
typ), high PSRR (65dB, typ) operation. This configura-
tion provides noise attenuation for the RF transceiver
power supply in the 100Hz to 100kHz range.
Other features include separate output enables, low-
supply current shutdown, output overcurrent, and
overtemperature protection. The MAX8896 is available
in a 16-bump, 2mm x 2mm UCSP™ package (0.7mm
max height).
Applications
WCDMA/NCDMA Cellular Handsets
Smartphones
Features
o PA Step-Down Converter (OUT1)
7.5µs (typ) Settling Time for 0.5V to 1V Output
Voltage Change
Dynamic Output Voltage Setting from 0.5V to
V
BATT
140mΩ Bypass PFET and 100% Duty Cycle
for Low Dropout
2MHz Switching Frequency
Low Output Voltage Ripple
700mA (min) Output Drive Capability
2% Gain Accuracy
Tiny External Components
o RF Step-Down Converter (OUT2)
2MHz Fixed Switching Frequency
94% Peak Efficiency
100% Duty Cycle
2% Output Accuracy Over Load, Line, and
Temperature
200mA (min) Output Drive Capability
Tiny External Components
o Low-Noise LDO
Guaranteed 200mA Output
High 65dB (typ) PSRR
Fixed Output Voltage
Low Noise (16µV
RMS
, typ)
o Simple Logic ON/OFF Controls
o Low 0.1µA Shutdown Current
o 2.7V to 5.5V Supply Voltage Range
o Thermal Shutdown
o 2mm x 2mm UCSP Package (4 x 4 Grid)
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
________________________________________________________________
Maxim Integrated Products
1
19-4663; Rev 0; 5/09
EVALUATION KIT
AVAILABLE
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
Ordering Information
PART PIN-PACKAGE
LDO
VOLTAGE
MAX8896EREE+T
16 UCSP (0.5mm pitch)
2.80V
Note: Device operates over the -40°C to +85°C temperature
range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
2 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
CC
= V
IN1
= V
IN2
= V
PAEN
= V
RFEN1
= V
RFEN2
= 3.6V, V
REFIN
= 0.72V, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C,
unless otherwise noted.) (Note 2)
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLY
Input Voltage V
CC
, V
IN1,
V
IN2
2.7 5.5 V
Input Undervoltage Threshold V
CC
rising, 180mV typical hysteresis 2.52 2.63 2.70 V
T
A
= +25°C 0.1 4
Shutdown Supply Current V
P AE N
= V
R FE N 1
= V
R FE N 2
= 0
T
A
= +85°C 0.1
µA
LOGIC CONTROL
PAEN, RFEN1, RFEN2 Logic
Input High Voltage
2.7V ≤ V
CC
≤ 5.5V 1.3 V
PAEN, RFEN1, RFEN2 Logic
Input Low Voltage
2.7V ≤ V
CC
≤ 5.5V 0.4 V
PAEN, RFEN1, RFEN2 Internal
Pulldown Resistor
400 800 1600 kΩ
T
A
= +25°C 0.01 1
PAEN, RFEN1, RFEN2 Logic
Input Current
V
IL
= 0
T
A
= +85°C 0.1
µA
REFBP
REFBP Output Voltage 0µA ≤ IREFBP ≤ 1µA 1.237 1.250 1.263 V
THERMAL PROTECTION
Thermal Shutdown T
A
rising, 20°C typical hysteresis +160 °C
OUT1
Quiescent Supply Current
VRFEN1 = VRFEN2 = 0V, IPA = 0A,
no switching
155 µA
p-channel MOSFET switch, I
LX1
= -200mA 0.16 0.40
On-Resistance
n-channel MOSFET rectifier, I
LX1
= 500mA 0.17 0.40
Ω
Load Regulation R
L
is the inductor resistance R
L
/2 V/A
T
A
= +25°C 0.1 5
LX1 Leakage Current V
IN1
= 5.5V, V
LX1
= 0V
T
A
= +85°C 1
µA
ABSOLUTE MAXIMUM RATINGS
V
CC
, IN1, IN2, PAEN, RFEN1, RFEN2,
REFIN, OUT2, REFBP to AGND .........................-0.3V to +6.0V
PAOUT to AGND........................................-0.3V to (V
IN1
+ 0.3V)
LDO to AGND .........................................-0.3V to (V
OUT2
+ 0.3V)
IN1, IN2 to V
CC
......................................................-0.3V to +0.3V
IN1 to IN2 ..............................................................-0.3V to +0.3V
PGND1, PGND2 to AGND.....................................-0.3V to +0.3V
LX1 Current .......................................................................1A
RMS
LX2 Current .......................................................................1A
RMS
IN1 and PAOUT Current....................................................1A
RMS
PAOUT, OUT2, LDO Short Circuit to PGND1,
PGND2 ....................................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Bump UCSP (derate 12.5mW/°C above +70°C) ............1W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)...96°C/W
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering, reflow) ...........................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
Peak Current Limit (p-Channel
MOSFET)
1200 1450 1700 mA
Valley Current Limit (n-Channel
MOSFET)
1100 1350 1600 mA
Minimum On-Time 70 ns
Minimum Off-Time 50 ns
Power-Up Delay From V
PAEN
rising to V
LX1
rising 50 75 µs
OUT1 REFIN
Common-Mode Range 0.2 1.7 V
REFIN-to-PAOUT Gain V
REFIN
= 0.32V or 1.32V, I
LX1
= 0A 2.45 2.5 2.55
Input Resistance 320 kΩ
BYPASS
Bypass Mode Threshold V
REFIN
falling, 150mV hysteresis
0.396
xV
CC
V
T
A
= +25°C 0.14
On-Resistance
p-channel MOSFET
I
OUT
= -90mA
T
A
= +85°C 0.3
Ω
Bypass Current Limit V
PAOUT
= 1.5V 700 1000 1400 mA
Step-Down Current Limit in
Bypass
1200 1450 1700 mA
Total Bypass Current Limit V
PAOUT
= V
LX1
= 1.5V 1900 2450 3100 mA
T
A
= +25°C 0.01 5
Bypass Off-Leakage Current
V
CC
= V
IN1
= 5.5V,
V
PAOUT
= 0V
T
A
= +85°C 1
µA
OUT2
Output Voltage
I
OUT2
= 0 to 150mA,
V
IN2
= V
CC
= 3.2V to 4.5V
3.038 3.1 3.162 V
T
A
= +25°C 0.01 5
OUT2 Leakage Current V
RFEN1
= V
RFEN2
= 0
T
A
= +85°C 0.1
µA
No-Load Supply Current V
PAEN
= 0V, I
OUT2
= 0A, switching 2.5 mA
p-channel MOSFET switch, I
LX2
= -40mA 300 mΩ
On-Resistance
n-channel MOSFET rectifier, I
LX2
= 40mA 300 mΩ
p-Channel Current-Limit
Threshold
400 450 500 mA
n-Channel Negative Current Limit 400 mA
Maximum Duty Cycle 100 %
Minimum Duty Cycle 16.5 %
PWM Frequency 1.8 2.0 2.2 MHz
Power-Up Delay From V
RFEN1
or V
RFEN2
rising to V
LX2
rising 35 75 µs
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
IN1
= V
IN2
= V
PAEN
= V
RFEN1
= V
RFEN2
= 3.6V, V
REFIN
= 0.72V, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C,
unless otherwise noted.) (Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX8896EREE+T

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Buy MAX8896EREE+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Dual PWM Step-Down Converter
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