|
Details, datasheet, quote on part number:ZXM64NO3X
| |
Datasheet text preview:
ZXRD1000 SERIES
HIGH EFFICIENCY SIMPLESYNC PWM DC-DC CONTROLLERS
DESCRIPTION The ZXRD1000 series provides complete control and protection functions for a high efficiency (> 95%) DC-DC converter solution. The choice of external MOSFETs allow the designer to size devices according to application. The ZXRD1000 series uses advanced DC-DC converter techniques to provide synchronous drive capability, using innovative circuits that allow easy and cost effective implementation of shoot through protection. The FEATURES · · · · · · · · · · · · > 95% Efficiency Fixed frequency (adjustable) PWM Voltage mode to ensure excellent stability & transient response Low quiescent current in shutdown mode,15µA Low battery flag Output down to 2.0V Overload protection Demonstration boards available Synchronous or non-synchronous operation Cost effective solution N or P channel MOSFETs QSOP16 package ZXRD1000 series can be used with an all N channel topology or a combination N & P channel topology. Additional functionality includes shutdown control, a u s e r adjustable low battery flag and simple adjustment of the fixed PWM switching frequency. The controller is available with fixed outputs of 5V or 3.3V and an adjustable (2.0 to 12V) output.
· · · · · · · · ·
Fixed 3.3, 5V and adjustable outputs Programmable soft start
APPLICATIONS High efficiency 5 to 3.3V converters up to 4A Sub-notebook computers Embedded processor power supply Distributed power supply Portable instruments Local on card conversion GPS systems
Very high efficiency SimpleSyncTM converter.
VCC
4.5-10V
D2 BAT54 R1 100k
Shut Down
9
IC1
13 VIN VDRIVE 2 Bootstrap 1
ZXM64N02X C10 1µF C11 1µF C6 1µF N1 L1 15µH
RS E N S E VOUT 3.3V 4A
SHDN LBSET
C5 1µF
Low input flag
0.01R R6 10k Cx2 0.01µF
COUT
11 LBF 14 10 6 5 Delay Decoup VINT CT GN D
RSENSE+ 7 RS E N S E - 8 VFB 16 Comp 15 PWR GN D 3
C9 1µF
RX R2 CX1 2µF 2k7 680R 0.02 R4 10k D3 BAT54
Fx D1
C8 2.2µF ZHCS1000 R5 6k
x2 680µF
120µF
CIN 68µF
C1 1µF
C2
330pF
1µF C4
4
1µF C3
C7 22µF
N2 ZXM64N02X
R3 3k
ISSUE 4 - OCTOBER 2000
1
ZXRD1000 SERIES
ABSOLUTE MAXIMUM RATINGS
Input without bootstrap (P suffix) Input with bootstrap(N suffix) Bootstrap voltage 20V Shutdown pin VIN LBSET pin VIN 20V 10V RSENSE+, RSENSE Power dissipation Operating temperature Storage temperature VIN 610mW (Note 4) -40 to +85°C -55 to +125°C
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
Sy mbol VI N ( m i n ) VF B ( N o t e 1) Parameter M i n . Operating Voltage F e e d b a c k Voltage Conditions N o Output Device VI N =5 V, I F B =1mA 4. 5 5 0 µA < I F B < 1 m A , V I N = 5 V 1 . 2 1 5 TDRIVE
ICC fos c ( N o t e 5) fos c(tol) DC
MAX
S u p p l y Current S h u t d o w n Current
16 15
20 50 30 0
mA µA kH z
O p e r a t i n g frequency range F r e q u e n c y with timing capacitor C 3 = 1 3 0 0 p F C3 =3 30 pF O s c i l l a t o r Tol. M a x Duty Cycle R S E N S E voltage differential L o w Battery Flag set voltage L o w Battery Flag output L o w Battery Flag Hysteresis L o w Battery Flag Sink Current S h u t d o w n Threshold Voltage S h u t d o w n Pin Source Current
VR SE N S E LBFSET LBFOUT LBFH YS T LBFS INK VS HD N ISH DN
V C M R S E N S E Common mode range of V R S E N S E
Note 1. VFB has a different function between fixed and adjustable controller options. Note 2. 2200pF is the maximum recommended gate capacitance. Note 3. Maximum supply for P phase controllers is 18V,maximum supply for N phase controllers is 10V. Note 4. See VIN derating graph in Typical Characteristics. Note 5. The maximum frequency in this application is 300kHz. For higher frequency operation contact Zetex Applications Department.
2
ISSUE 4 - OCTOBER 2000
ZXRD1000 SERIES
TYPICAL CHARACTERISTICS
202 201
C3=330pF VIN=5V
210 205 200 195 198 190 197 4 6 8 10 12 14 16 18 20 -40 -20 0 20 40 60
C3=330pF
FOSC (kHz)
200 199
FOSC (kHz)
80
100
VIN (V)
Temperature (°C)
FOSC v VIN
FOSC v Temperature
VOUT=3.3V
1.244 1.242
1.25
VIN=5V VOUT=3.3V
1.245
VFB (V)
1.24 1.238
VFB (V)
4 6 8 10 12 14 16 18 20
1.24 1.235
1.236
1.23 -40 -20 0 20 40 60 80 100
VIN (V)
Temperature (°C)
VFB v VIN
VFB v Temperature
1.02 1.005
VIN=5V
Normalised LBSET
1.01
Normalised LBSET
4 6 8 10 12 14 16 18 20
1.000
1.00
0.995
0.99 -40 -20 0 20 40 60 80 100
VIN (V)
Temperature (°C)
Normalised LBSET v VIN
Normalised LBSET v Temperature
ISSUE 4 - OCTOBER 2000
3
|
|
