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MAX8896EREE+T
Dual PWM Step-Down Converter in a 2mm x 2mm Package for WCDMA PA and RF Power
General DescriptionThe 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 ispreset to 3.1V to provide power to a
200mA, 2.8V LDO designed for low noise (16µVRMS,
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).
ApplicationsWCDMA/NCDMA Cellular Handsets
Smartphones
FeaturesPA 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
VBATT
140mΩBypass 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 ComponentsRF 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 ComponentsLow-Noise LDO
Guaranteed 200mA Output
High 65dB (typ) PSRR
Fixed Output Voltage
Low Noise (16µVRMS, typ)Simple Logic ON/OFF ControlsLow 0.1µA Shutdown Current2.7V to 5.5V Supply Voltage RangeThermal Shutdown2mm 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 Power19-4663; Rev 0; 5/09
EVALUATION KIT
AVAILABLE
Ordering Information
PARTPIN-PACKAGELDO
VOLTAGEMAX8896EREE+T16 UCSP (0.5mm pitch)2.80V
Note: Device operates over the -40°C to +85°C temperaturerange.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
ELECTRICAL CHARACTERISTICS(VCC= VIN1= VIN2= VPAEN= VRFEN1= VRFEN2= 3.6V, VREFIN= 0.72V, TA= -40°C to +85°C, typical values are at TA= +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.
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT SUPPLYInput VoltageVCC, VIN1, VIN22.75.5V
Input Undervoltage ThresholdVCC rising, 180mV typical hysteresis2.522.632.70V
TA = +25°C0.14Shutdown Supply CurrentV P AE N = V R FE N 1 = V R FE N 2 = 0TA = +85°C0.1µA
LOGIC CONTROLPAEN, RFEN1, RFEN2 Logic
Input High Voltage2.7V ≤ VCC ≤ 5.5V1.3V
PAEN, RFEN1, RFEN2 Logic
Input Low Voltage2.7V ≤ VCC ≤ 5.5V0.4V
PAEN, RFEN1, RFEN2 Internal
Pulldown Resistor4008001600kΩ
TA = +25°C0.011PAEN, RFEN1, RFEN2 Logic
Input CurrentVIL = 0TA = +85°C0.1µA
REFBPREFBP Output Voltage0µA ≤ IREFBP ≤ 1µA1.2371.2501.263V
THERMAL PROTECTIONThermal ShutdownTA rising, 20°C typical hysteresis+160°C
OUT1Quiescent Supply CurrentVRFEN1 = VRFEN2 = 0V, IPA = 0A,
no switching155µA
p-channel MOSFET switch, ILX1 = -200mA0.160.40On-Resistancen-channel MOSFET rectifier, ILX1 = 500mA0.170.40Ω
Load RegulationRL is the inductor resistanceRL/2V/A
TA = +25°C0.15LX1 Leakage CurrentVIN1 = 5.5V, VLX1 = 0VµA
ABSOLUTE MAXIMUM RATINGSVCC, IN1, IN2, PAEN, RFEN1, RFEN2,
REFIN, OUT2, REFBP to AGND.........................-0.3V to +6.0V
PAOUT to AGND........................................-0.3V to (VIN1+ 0.3V)
LDO to AGND.........................................-0.3V to (VOUT2+ 0.3V)
IN1, IN2 to VCC......................................................-0.3V to +0.3V
IN1 to IN2..............................................................-0.3V to +0.3V
PGND1, PGND2 to AGND.....................................-0.3V to +0.3V
LX1 Current.......................................................................1ARMS
LX2 Current.......................................................................1ARMS
IN1 and PAOUT Current....................................................1ARMS
PAOUT, OUT2, LDO Short Circuit to PGND1,
PGND2....................................................................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Bump UCSP (derate 12.5mW/°C above +70°C)............1W
Junction-to-Ambient Thermal Resistance (θJA) (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 /thermal-tutorial.
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
PARAMETERCONDITIONSMINTYPMAXUNITSPeak Current Limit (p-Channel
MOSFET)120014501700mA
Valley Current Limit (n-Channel
MOSFET)110013501600mA
Minimum On-Time70ns
Minimum Off-Time50ns
Power-Up DelayFrom VPAEN rising to VLX1 rising5075µs
OUT1 REFINCommon-Mode Range0.21.7V
REFIN-to-PAOUT GainVREFIN = 0.32V or 1.32V, ILX1 = 0A2.452.52.55
Input Resistance320kΩ
BYPASSBypass Mode ThresholdVREFIN falling, 150mV hysteresis0.396
xVCCV
TA = +25°C0.14On-Resistancep-channel MOSFET
IOUT = -90mATA = +85°C0.3Ω
Bypass Current LimitVPAOUT = 1.5V70010001400mA
Step-Down Current Limit in
Bypass120014501700mA
Total Bypass Current LimitVPAOUT = VLX1 = 1.5V190024503100mA
TA = +25°C0.015Bypass Off-Leakage CurrentVCC = VIN1 = 5.5V,
VPAOUT = 0VTA = +85°C1µA
OUT2Output VoltageIOUT2 = 0 to 150mA,
VIN2 = VCC = 3.2V to 4.5V3.0383.13.162V
TA = +25°C0.015OUT2 Leakage CurrentVRFEN1 = VRFEN2 = 0TA = +85°C0.1µA
No-Load Supply CurrentVPAEN = 0V, IOUT2 = 0A, switching2.5mA
p-channel MOSFET switch, ILX2 = -40mA300mΩOn-Resistancen-channel MOSFET rectifier, ILX2 = 40mA300mΩ
p-Channel Current-Limit
Threshold400450500mA
n-Channel Negative Current Limit400mA
Maximum Duty Cycle100%
Minimum Duty Cycle16.5%
PWM Frequency1.82.02.2MHz
Power-Up DelayFrom VRFEN1 or VRFEN2 rising to VLX2 rising3575µs
ELECTRICAL CHARACTERISTICS (continued)(VCC= VIN1= VIN2= VPAEN= VRFEN1= VRFEN2= 3.6V, VREFIN= 0.72V, TA= -40°C to +85°C, typical values are at TA= +25°C,
unless otherwise noted.) (Note 2)
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
ELECTRICAL CHARACTERISTICS (continued)(VCC= VIN1= VIN2= VPAEN= VRFEN1= VRFEN2= 3.6V, VREFIN= 0.72V, TA= -40°C to +85°C, typical values are at TA= +25°C,
unless otherwise noted.) (Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
LDOOutput Voltage, VLDOVOUT2 = 3.1V, ILDO = 1mA to 200mA2.7442.8002.856V
Current LimitVOUT2 = 3.1V, VLDO = 0V250420750mA
Dropout VoltageVOUT2 = 3.1V, ILDO = 100mA70mV
Line RegulationVOUT2 stepped from 3.5V to 5.5V, ILDO = 100mA2.4mV
Load RegulationVOUT2 = 3.1V, ILDO stepped from 50µA to 200mA25mV
Power-Supply Rejection
ΔVLDO/ΔVOUT2
VOUT2 = 3.1V, 10Hz to 10kHz,
CLDO = 1µF, ILDO = 100mA65dB
Output Noise100Hz to 100kHz,
CLDO = 1µF, ILDO = 100mA16µVRMS
Minimum Output Capacitance for
Stable Operation0 < ILDO < 200mA1µF
Output Leakage CurrentVOUT2 = 3.1V, VRFEN1 = VRFEN2 = 0V25nA
Power-Up DelayFrom VRFEN1 or VRFEN2 rising to VLDO rising50µs
Note 2:All devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design.
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power200100300400500600700
OUT1 PA BYPASS MODE DROPOUT
VOLTAGE vs. PA LOAD CURRENTMAX8896 toc01
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
VIN1 = 3.2V
VIN1 = 3.6V
VIN1 = 4.2V
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. OUTPUT VOLTAGE
MAX8896 oc02
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
VIN1 = 4.2V
VIN1 = 3.6V
VIN1 = 3.2V
RPA = 7.5Ω
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 3.18V
MAX8896 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 2.58V
MAX8896 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 1.58V
MAX8896 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 1.18V
MAX8896 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 0.77V
MAX8896 toc07
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
VPA = 0.56VMAX8896 toc08
EFFICIENCY (%)
OUT1 PA STEP-DOWN CONVERTER
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8896 toc09
OUTPUT VOLTAGE (V)
RL = 0.09Ω
Typical Operating Characteristics(VCC= VIN1= VIN2= 3.6V, VREFIN= 0.72V, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
Typical Operating Characteristics (continued)(VCC= VIN1= VIN2= 3.6V, VREFIN= 0.72V, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
OUT1 PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE vs. REFIN VOLTAGE
MAX8896 toc10
REFIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE ERROR
vs. LOAD CURRENTMAX8896 toc11
LOAD CURRENT (mA)
OUTPUT VOLTAGE ERROR (%)
VOUT = 3.18V
VOUT = 0.56V
OUT1 LIGHT-LOAD SWITCHING
WAVEFORMSMAX8896 toc12
VLX1
IL1
VPA
2V/div
200mA/div
20mV/div
(AC-COUPLED)
200ns/div
5mA LOAD
200ns/div
OUT1 HEAVY-LOAD SWITCHING
WAVEFORMSILX1200mA/div
20mV/div
(AC-COUPLED)
2V/div
MAX8896 toc13
VPA
VLX1
500mA LOAD
20μs/div
OUT1 STARTUP AND SHUTDOWNVPAEN5V/div
1V/div
500mA/div
MAX8896 toc14
VPA
IL1
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power10μs/div
OUT1 LOAD TRANSIENT RESPONSEIOUT
200mA/div
100mV/div
(AC-COUPLED)
MAX8896 toc16
VPA
500mA
0mA
10μs/div
OUT1 REFIN TRANSIENT RESPONSEVREFIN
500mV/div
500mV/div
1A/div
MAX8896 toc17
VPA
IL1
0.72V
0.2V1.8V
0.5V
2.5Ω LOAD
10μs/div
OUT1 REFIN TRANSIENT RESPONSE
WITH BYPASS EVENTVREFIN1V/div
1V/div
1A/div
MAX8896 toc18
VPA
IL1
3.3V0.6V
1.8V
OUT2 EFFICIENCY
vs. LOAD CURRENT
MAX8896 toc19
LOAD CURRENT (mA)
EFFICIENCY (%)
VCC = 4.2VVCC = 3.6V
VCC = 3.2V
20μs/div
OUT1 LINE TRANSIENT RESPONSEVIN500mV/div
10mV/div
(AC-COUPLED)
200mA/div
MAX8896 toc15
VPA
IL1
50mA LOAD
4.0V
3.5V
Typical Operating Characteristics (continued)(VCC= VIN1= VIN2= 3.6V, VREFIN= 0.72V, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
*OUT2 IN DROPOUT
OUT2 VOLTAGE
vs. LOAD CURRENTMAX8896 toc20
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
VCC = 3.6V
VCC = 3.2V*
VCC = 4.2V
10μs/div
OUT2 LOAD TRANSIENT RESPONSE100mA/div
MAX8896 toc25
IOUT2
VOUT2
100mV/div
(AC-COUPLED)
150mA
0mA
OUT2 DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8896 toc26
LOAD CURRENT (mA)
DROPOUT VOLTAGE (V)
VIN = 2.7V
RL = 0.3Ω
MAX8896
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power200ns/div
OUT2 HEAVY-LOAD SWITCHING
WAVEFORMSVLX2
10mV/div
(AC-COUPLED)
5V/div
200mA/div
MAX8896 toc22
VOUT2
IL2
200mA LOAD
10μs/div
OUT2 STARTUP WAVEFORMVOUT2
2V/div
200mA/div
MAX8896 toc23
IL2
VRFEN_5V/div
Typical Operating Characteristics (continued)(VCC= VIN1= VIN2= 3.6V, VREFIN= 0.72V, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
20μs/div
OUT2 LINE TRANSIENT RESPONSEVIN500mV/div
200mA/div
MAX8896 toc24
VOUT2
IL2
50mV/div
(AC-COUPLED)
4.0V
3.5V
20mA LOAD
200ns/div
OUT2 LIGHT-LOAD SWITCHING
WAVEFORMSVLX2
10mV/div
(AC-COUPLED)
5V/div
200mA/div
MAX8896 toc21
VOUT2
IL2
20mA LOAD
MAX8896LDO OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8896 toc27
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
LDO DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8896 toc28
LOAD CURRENT (mA)
DROPOUT VOLTAGE (V)
VOUT2 = 2.7V
4μs/div
LDO LOAD TRANSIENT RESPONSE50mA/div
MAX8896 toc29
VLDO
ILDO
20mV/div
(AC-COUPLED)
80mA
10mA
VRFEN1
VOUT2
VLDO
200mA LOAD ON LDO
400μs/div
LDO STARTUP WAVEFORMMAX8896 toc30
2V/div
2V/div
2V/div
400μs/div
LDO OUTPUT NOISE
(OUT1, OUT2, AND LDO ENABLED)MAX8896 toc31
VLDO
30mA LOAD
10μV/div
LDO OUTPUT-NOISE SPECTRAL
DENSITY vs. FREQUENCY
(OUT1, OUT2, AND LDO ENABLED)MAX8896 toc32
1,0001001010.1
10E+0
100E+0
1E+3
10E+3
1E+0
0.0110,000
NOISE DENSITY (nV/
Hz)
Typical Operating Characteristics (continued)(VCC= VIN1= VIN2= 3.6V, VREFIN= 0.72V, circuit of Figure 3, TA= +25°C, unless otherwise noted.)
Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
