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PDF MAX8836Z Data sheet ( Hoja de datos )
| Número de pieza | MAX8836Z | |
| Descripción | 1.2A PWM Step-Down Converter In 2mm X 2mm WLP/UCSP | |
| Fabricantes | Maxim Integrated Products | |
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19-4059; Rev 1; 9/08
www.DataSheet4U.com
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 60mΩ typical 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 (60mΩ typ) 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
60mΩ PFET 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.
1 page  
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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 = 7.5Ω, 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 = 7.5Ω
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 = 7.5Ω
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
_______________________________________________________________________________________ 5
5 Page 
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1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
Table 1. Suggested Inductors
MANUFACTURER
SERIES
Coilcraft
LPO3310
FDK
Murata
Sumida
MIPF2520
MIPS2520
MIPF2016
LQH32C_53
CDRH2D09
Taiyo Yuden
TOKO
CDRH2D11
CB2518T
D3010FB
D2812C
D310F
D312C
INDUCTANCE
(µH)
1.0
1.5
2.2
1.0
1.5
2.2
1.3
2.0
1.0
2.2
1.0
2.2
1.2
1.5
2.2
1.5
2.2
3.3
2.2
4.7
1.0
1.2
2.2
1.5
2.2
1.5
2.2
ESR
(Ω)
0.07
0.10
0.13
0.05
0.07
0.08
0.09
0.11
0.11
0.06
0.10
0.08
0.09
0.12
0.05
0.08
0.10
0.09
0.13
0.20
0.09
0.15
0.13
0.17
0.10
0.12
CURRENT RATING
(mA)
1600
1400
1100
1500
1500
1300
1500
1200
1100
1000
790
590
520
440
680
580
450
510
340
1170
860
640
1230
1080
1290
1140
DIMENSIONS
(mm)
3.3 x 3.3 x 1.0 = 11mm3
2.5 x 2.0 x 1.0 = 5mm3
2.5 x 2.0 x 1.0 = 5mm3
2.0 x 1.6 x 1.0 = 3.2mm3
3.2 x 2.5 x 1.7 = 14mm3
3.0 x 3.0 x 1.0 = 9mm3
3.2 x 3.2 x 1.2 = 12mm3
2.5 x 1.8 x 2.0 = 9mm3
3.0 x 3.0 x 1.0 = 9mm3
3.0 x 3.0 x 1.2 = 11mm3
3.6 x 3.6 x 1.0 = 13mm3
3.6 x 3.6 x 1.2 = 16mm3
For the LDO, use an input capacitance equal to the
value of the output capacitance of LDO2. Larger input
capacitor values and lower ESR provide better noise
rejection and line-transient response.
Note that some ceramic dielectrics exhibit large capaci-
tance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary to
use two times the output capacitor value of LDO2 (or
larger) to ensure stability at temperatures below -10°C.
With X7R or X5R dielectrics, a capacitance equal to the
output capacitor value is sufficient at all operating tem-
peratures.
Thermal Considerations
In most applications, the MAX8836Z does not dissipate
much heat due to the high efficiency. However, in
applications where the MAX8836Z operates at high
ambient temperature with heavy loads, the heat dissi-
pated may exceed the maximum junction temperature
of the IC. If the junction temperature reaches approxi-
mately +160°C, all power switches are turned off and
LX and PA_ become high impedance, and LDO2 is
pulled down to ground through an internal 1kΩ pull-
down resistor.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX8836Z.PDF ] | |
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