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19-4059; Rev 1; 9/08
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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
General Description
The MAX8836Z high-frequency step-down converter is
optimized to provide a fixed output voltage with ultra-
low dropout. The device integrates a high-efficiency
PWM step-down converter for medium- and low-power
transmission, and a 60mtypical bypass FET for ultra
low-dropout operation. A 200mA low-noise, high-PSRR
low-dropout regulator (LDO) is also integrated.
Fast-switching allows the use of small ceramic input and
output capacitors while maintaining low ripple voltage.
The feedback network is integrated, further reducing
external component count and total solution size. At high
duty cycle, the MAX8836Z automatically switches to the
bypass mode, connecting the input to the output
through a low-impedance (60mtyp) MOSFET. The
LDO in the MAX8836Z is designed for low-noise opera-
tion (35µVRMS typ). Both the PWM step-down and LDO
are individually enabled through separate logic-control
interfaces.
The MAX8836Z is available in 16-bump, 2mm x 2mm
WLP and UCSP™ packages (0.7mm max height).
Applications
WCDMA/NCDMA Cellular Handsets
Wireless PDAs
Smartphones
Ordering Information
PART
PIN-PACKAGE TEMP RANGE
MAX8836ZEWEEE+T
16 WLP
(W162B2+1)
-40°C to +85°C
MAX8836ZEREEE+T 16 UCSP
(R162A2+1)
-40°C to +85°C
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
Features
o PA Step-Down Converter
Selectable Output Voltage (3.1V or 3.4V)
25µs Settling Time for 3.1V to 3.4 VOUT Change
60mPFET at 100% Duty-Cycle for Low
Dropout
Low Output Voltage Ripple
1.2A Output Drive Capability
±2% Output Voltage Accuracy
Tiny External Components
o Low-Noise LDO
Low 35µVRMS (typ) Output Noise
High 65dB (typ) PSRR
Guaranteed 200mA Output Current Drive
Capability
ON/OFF Control
o Low 0.1µA Shutdown Current
o 2.7V to 5.5V Supply Voltage Range
o Thermal Shutdown
o Tiny 2mm x 2mm x 0.7mm WLP and UCSP
Packages (4 x 4 Grid)
Typical Operating Circuit
INPUT
Li+ BATTERY
4.7µF
IN
GND
PA
LX
SET OUTPUT
MAX8836Z
HP
ENABLE BUCK
PA_EN
LDO2
ENABLE LDO
EN2
REFBP
0.22µF
OUTPUT
3.1V OR 3.4V
2.2µH
4.7µF
200mA
1µF
Pin Configuration appears at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.

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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
ABSOLUTE MAXIMUM RATINGS
IN1A, IN1B, IN2, EN2, REFBP to AGND................-0.3V to +6.0V
PAA, PAB, PA_EN, HP to AGND....-0.3V to (VIN1A/VIN1B + 0.3V)
LDO2 to AGND ..........................................-0.3V to (VIN2 + 0.3V)
IN2 to IN1B/IN1A ...................................................-0.3V to +0.3V
PGND to AGND .....................................................-0.3V to +0.3V
LX Current ......................................................................0.7ARMS
IN1A/IN1B and PAA/PAB Current .....................................2ARMS
PAA and PAB Short Circuit to GND or IN...................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Bump WLP (derate 12.5mW/°C above +70°C).............1W
16-Bump UCSP (derate 12.5mW/°C above +70°C) ..........1W
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering, reflow) ............................+260°C
Note: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
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.
ELECTRICAL CHARACTERISTICS
(VIN1A = VIN1B = VIN2 = VPA_EN = VEN2 = 3.6V, VHP = 0V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
INPUT SUPPLY
Input Voltage
Input Undervoltage Threshold
HP, PA_EN, EN2 Pulldown
Resistor
Shutdown Supply Current
No-Load Supply Current
THERMAL PROTECTION
Thermal Shutdown
LOGIC CONTROL
CONDITIONS
VIN1A, VIN1B, VIN2
VIN1A, VIN1B, VIN2 rising, 180mV typical hysteresis
VPA_EN = VEN2 = 0V
TA = +25°C
TA = +85°C
VPA_EN = 0V, ILDO2 = 0A
VEN2 = 0V, IPA = 0A, switching
VEN2 = 0V, IPA = 0A, no switching
TA rising, 20°C typical hysteresis
MIN TYP MAX UNITS
2.7
2.52
400
2.63
800
0.1
0.1
100
3500
180
5.5
2.70
1600
4
150
V
V
k
µA
µA
+160
°C
PA_EN, EN2, HP Logic-Input
High Voltage
1.3 V
PA_EN, EN2, HP Logic-Input Low
Voltage
Logic-Input Current
(PA_EN, EN2, HP)
VIL = 0V
PA OUTPUT VOLTAGE
Output Voltage
ILX = 0A, VIN1A = VIN1B
= VIN2 = 3.9V
Output Voltage Load Regulation
TA = +25°C
TA = +85°C
HP = 0
HP = 1
0.4
0.01 1
0.1
V
µA
3.365
3.010
3.434
3.065
ILX x
RL/2
3.503
3.190
V
V
2 _______________________________________________________________________________________

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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
ELECTRICAL CHARACTERISTICS (continued)
(VIN1A = VIN1B = VIN2 = VPA_EN = VEN2 = 3.6V, VHP = 0V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
LX
On-Resistance
LX Leakage Current
p-Channel MOSFET Peak
Current Limit
n-Channel MOSFET Valley
Current Limit
Minimum On- and Off-Times
Power-Up Delay
BYPASS
On-Resistance
Bypass Current Limit
Total Bypass Current Limit
Bypass Threshold
Bypass Off-Leakage Current
LDO2
Output Voltage VLDO2
Output Current
Current Limit
Dropout Voltage
Line Regulation
Load Regulation
Power-Supply Rejection
VLDO2/VIN2
Output Noise
Output Capacitor for Stable
Operation
Shutdown Output Impedance
REFBP
REFBP Output Voltage
REFBP Supply Rejection
CONDITIONS
p-channel MOSFET switch, ILX = -40mA
n-channel MOSFET rectifier, ILX = 40mA
VIN1A = VIN1B = VIN2 = 5.5V,
VLX = 0V
TA = +25°C
TA = +85°C
VLX = 0V
From PA_EN rising to LX rising
p-channel MOSFET bypass,
IPA = -90mA
VPA = 0V
VLX = VPA = 0V
TA = +25°C
TA = +85°C
VIN2 rising, 150mV hysteresis
VIN1A = VIN1B = VIN2 = 5.5V,
VPAA = VPAB = 0V
TA = +25°C
TA = +85°C
VIN2 = 5.5V, ILDO2 = 1mA;
VIN2 = 3.4V, ILDO2 = 1mA
VLDO2 = 0V
ILDO2 = 100mA, TA = +25°C (VLDO2 2.5V)
VIN2 stepped from 3.5V to 5.5V, ILDO2 = 100mA
ILDO2 stepped from 50µA to 200mA
10Hz to 10kHz, CLDO2 = 1µF, ILDO2 = 30mA
100Hz to 100kHz, CLDO2 = 1µF, ILDO2 = 30mA
0 < ILDO2 < 10mA
0 < ILDO2 < 200mA
VEN2 = 0V
0 IREFBP 1µA
VIN2 stepped from 2.55V to 5.5V
MIN TYP MAX UNITS
0.15
0.15
0.1 5
1
1.3 1.5 1.8
1.1 1.3 1.6
0.07
80 190
µA
A
A
µs
µs
0.060 0.1
0.1
0.8 1.4 1.8
2.1 2.9 3.6
0.985 x
VPA
0.01 5
0.1
A
A
V/V
µA
2.765 2.85 2.936
V
200
250 550 750
70
2.4
25
mA
mA
mV
mV
mV
65 dB
35 µVRMS
100 nF
1 µF
1 k
1.237 1.250 1.263
0.2 5
V
mV
Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
_______________________________________________________________________________________ 3

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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
Typical Operating Characteristics
(VIN1A = VIN1B = VIN2 = 3.6V, VPA = 3.4V, VLDO2 = 2.85V, RPA = 7.5, circuit of MAX8805WEVKIT, TA = +25°C, unless otherwise
noted.)
BYPASS MODE DROPOUT VOLTAGE
vs. PA LOAD CURRENT
140
120
100
80
60
40
20
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
PA LOAD CURRENT (A)
PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
100
VIN1A = VIN1B = 3.6V
98
96
94
92
90 VIN1A = VIN1B = 3.9V
88 VIN1A = VIN1B = 4.2V
86
84
82
80
10
L = 2.2µH
FDK MIPF2520
100
LOAD CURRENT (mA)
1000
PA STEP-DOWN CONVERTER
EFFICIENCY vs. LOAD CURRENT
100
VIN1A = VIN1B = 3.6V
98
96
94
92
90 VIN1A = VIN1B = 3.9V
88
86
84
82
80
10
VIN1A = VIN1B = 4.2V
L = 1µH
FDK MIPF2520
100
LOAD CURRENT (mA)
1000
PA STEP-DOWN CONVERTER
OUTPUT VOLTAGE vs. LOAD CURRENT
3.7
3.6
3.5 HP = PGND
3.4
3.3
3.2 HP = IN1A = IN1B
3.1
3.0
2.9
2.8
2.7
0
200 400 600 800
LOAD CURRENT (mA)
1000
PA STEP-DOWN CONVERTER
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
3.4
3.3 HP = PGND
3.2
3.1
3.0
2.9 HP = IN1A = IN1B
2.8
2.7
2.6
2.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
PA STEP-DOWN CONVERTER LIGHT-LOAD
SWITCHING WAVEFORMS
MAX8836Z toc06
PA STEP-DOWN CONVERTER
HEAVY-LOAD SWITCHING
MAX8836Z toc07
VPA
50mV/div
AC-COUPLED
VPA
50mV/div
AC-COUPLED
ILX 200mA/div
ILX 200mA/div
VLX
2V/div
VLX
2V/div
VPA = 3.4V, IPA = 50mA
1µs/div
VPA = 3.4V, IPA = 500mA
1µs/div
4 _______________________________________________________________________________________

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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
Typical Operating Characteristics (continued)
(VIN1A = VIN1B = VIN2 = 3.6V, VPA = 3.4V, VLDO2 = 2.85V, RPA = 7.5, circuit of MAX8805WEVKIT, TA = +25°C, unless otherwise
noted.)
PA STEP-DOWN CONVERTER
SOFT-START WAVEFORMS
MAX8836Z toc08
PA STEP-DOWN CONVERTER
LINE-TRANSIENT RESPONSE
MAX8836Z toc09
4.2V
VPA_EN
VPA
2V/div
2V/div
VIN1_
VPA
3.6V
200mV/div
AC-COUPLED
500mA/div
VLX
200mA/div
ILX
20µs/div
200µs/div
RPA = 7.5
PA STEP-DOWN CONVERTER
LOAD-TRANSIENT RESPONSE
MAX8836Z toc10
PA STEP-DOWN CONVERTER
SHUTDOWN RESPONSE
MAX8836Z toc11
500mA/div
VPA_EN
2V/div
IPA
VPA
200mV/div
AC-COUPLED
VPA
2V/div
VIN
200mV/div
ILX
500mA/div
AC-COUPLED
10µs/div
RL = 7.5
10µs/div
LDO2 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
140
LDO2 DROPOUT VOLTAGE
vs. LOAD CURRENT
150
120
120
100
80 90
60
40 VIN1A = VIN1B = 0V,
EN2 = IN2,
20 PA_EN = PGND,
ILDO2 = 0A
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
60
30
0
0
50 100 150
LOAD CURRENT (mA)
200
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