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PDF AS3729 Data sheet ( Hoja de datos )
| Número de pieza | AS3729 | |
| Descripción | 5A Power Stage | |
| Fabricantes | ams | |
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General Description
AS3729
5A Power Stage
The AS3729 is a companion power stage, intended to be used
with AS372x products. It cannot be used without a DCDC
controller. It contains the power FETs for 2 phases and is capable
to handle output currents of 2.5A per phase.
Ordering Information and Content Guide appear at end of
datasheet.
Figure 1:
Added Value of Using AS3729
Key Benefits & Features
The benefits and features of AS3729, 5A Power Stage are listed
below:
Benefits
Support for single or dual phase operation
2 x 2.5A output stages are running on 3MHz
Over-temperature protection
Cost effective, small package
Features
• 2 phases with separate control input
• Separate power NMOS & PMOS for 2.5A per phase
• Separate coil current feedback per phase
• Stand-alone zero-crossing operation
• Integrated temperature monitoring
• 16-pin WL-CSP: 1.615mm x 1.615mm, 0.4mm pitch
Applications
The device is a high current dual-phase DCDC and ideal for:
• Mobile phones
• Tablets
• Notebooks
ams Datasheet
[v1-24] 2015-Aug-13
Page 1
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1 page  
AS3729 − Electrical Characteristics
Electrical Characteristics
Typical values are at VSUP = 3.8V, TA = 25°C (unless otherwise
specified). All limits are guaranteed. The parameters with Min
and Max values are guaranteed with production tests or SQC
(Statistical Quality Control) methods.
Figure 6:
Step Down DCDC Power Stage Parameters
Symbol
Parameter
Comments
Min
VIN Input voltage
ILIMIT
ILOAD
Peak coil current limit
Load current
Pin VSUPx
Pin CTRLx
Pin TEMP
Single phase
Continuous load current
Peak load current
2.5
0
0
0
RPMOS
P-switch On resistance (2) Single phase
RNMOS
N-switch On resistance (2) Single phase
fSW Switching frequency
Supplied by DCDC
controller
IQ_force_PWM Quiescent current PWM
TEMP pin high, force
PWM mode active
IQ_low_power Quiescent current LP
TEMP pin high, low
power mode active
Ipower_off Power-Off current
No current into pin TEMP
Rdischarge active discharge
Single phase
Typ Max Units
5.5 V
5.5 V
3.6 V
4A
2.5 A
3 (1)
40 70 mΩ
30 50 mΩ
2.7 3 MHz
6.2 mA
21 μA
±1 μA
16 Ω
Note(s) and/or Footnote(s):
1. Maximum value only for pulsed peak current.
2. MOS transistor only without package parasitics.
ams Datasheet
[v1-24] 2015-Aug-13
Page 5
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5 Page 
AS3729 − Parameters
AS3729 Step Down DCDC: Shows the
Efficiency of the AS3729 in dual phase
mode @ 1.0V with VSUP=3.7V, TA=25°C
and Murata LQM2HPN1R0MJH coil.
Figure 17:
3.7V Efficiency vs. Output Current LQMHPN Frequency
Comparison
90
85
80
75
70
65
60
55
50
45
40
0,001
3MHz
3MHz, low noise
1.5MHz
1.5MHz, low noise
0,01 0,1
1
Output Current (A)
10
ams Datasheet
[v1-24] 2015-Aug-13
Page 11
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AS3729.PDF ] | |
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