XC9236 Torex Semiconductor, XC9236 Datasheet

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XC9236

Manufacturer Part Number
XC9236
Description
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
Manufacturer
Torex Semiconductor
Datasheet

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XC9235/XC9236/XC9237
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
■GENERAL DESCRIPTION
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω
P-channel driver transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs
enable a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two
capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from
0.8V to 4.0V in increments of 50mV (accuracy: ±2.0%). With the built-in oscillator, ether 1.2MHz or 3.0MHz can be selected
for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is
automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and
the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of
loads (from light load to heavy load).
current consumption to as low as 1.0μA or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.
The XC9235B/XC9236B/XC9237B series provide short-time turn-on by the soft start function internally set in 0.25 ms (TYP).
The XC9235B(C)/XC9236B(C)/XC9237B(C) integrate C
capacitor C
enter stand-by mode, output voltage quickly returns to the V
■APPLICATIONS
●Mobile phones
●Bluetooth equipment
●PDAs, portable communication modem
●Portable games
●Digital cameras, video cameras
●Cordless phones
●Notebook computers
■TYPICAL APPLICATION CIRCUIT
Two types of package SOT-25 and USP-6C are available.
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce
L
to be discharged via the internal auto-discharge switch located between the L
L
auto discharge function which enables the electric charge at the output
SS
level as a result of this function.
■TYPICAL PERFORMANCE
●Efficiency vs. Output Current(FOSC=1.2NHz, V
■FEATURES
P-ch Driver Transistor Built-In
N-ch Driver Transistor Built-In
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In
Low ESR Ceramic Capacitor Compatible
Packages
C
(XC9235B(C)/XC9236B(C)/XC9237B(C) Series)
High Speed Soft Start
(XC9235B/XC9236B/XC9237B Series)
* Performance depends on external components and wiring on the PCB.
L
High Speed Discharge
CHARACTERISTICS
Series
100
90
80
70
60
50
40
30
20
10
0
0.1
PWM/PFM Automatic Sw itching Control
2.4V
3.6V
VIN= 4.2V
Output Current:IOUT(mA)
1
☆GreenOperation Compatible
X
and V
: ON resistance 0.42Ω
: ON resistance 0.52Ω
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V
: 92% (TYP.)
: 600mA
: 1.2MHz, 3.0MHz (+15%)
: 100%
: PWM (XC9235)
(Constant Current & Latching)
: SOT-25, USP-6C
10
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
SS
2.4V
pins. When the devices
3.6V
PWM Control
VIN= 4.2V
100
OUT
=1.8V)
1000
ETR0514-007
1/28

Related parts for XC9236

XC9236 Summary of contents

Page 1

... With the built-in oscillator, ether 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load) ...

Page 2

... CLASSIFICATION ●Ordering Information XC9235①②③④⑤⑥ PWM fixed control XC9236①②③④⑤⑥ PWM / PFM automatic switching control XC9237①②③④⑤⑥ PWM fixed control PWM / PFM automatic switching, manual switching ...

Page 3

... XC9235 series chooses only PWM control. The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9236 series chooses only PWM/PFM automatic switching control. Diodes inside the circuit are ESD protection diodes and parasitic diodes. ...

Page 4

... XC9235/XC9236/XC9237 ■ELECTRICAL CHARACTERISTICS XC9237A18Cxx, V =1.8V, FOSC=1.2MHz, Ta=25℃ OUT PARAMETER SYMBOL Output Voltage V OUT Operating Voltage Range V IN Maximum Output Current I OUTMAX U.V.L.O. Voltage V UVLO Supply Current I DD Stand-by Current I STB Oscillation Frequency FOSC PFM Switching Current I PFM Maximum I Limit MAXI PFM Maximum Duty Cycle ...

Page 5

... V =Setting Voltage IN OUT(E) because those are only for the PFM control’s functions. PFM and V because those are only for the XC9237 series’ functions. PWML XC9235/XC9236/XC9237 MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 2.0 - 6.0 600 ...

Page 6

... XC9235/XC9236/XC9237 ■ELECTRICAL CHARACTERISTICS (Continued) XC9237B(C)18Cxx, V =1.8V, FOSC=1.2MHz, Ta=25℃ OUT PARAMETER SYMBOL Output Voltage V OUT Operating Voltage Range V IN Maximum Output Current I OUTMAX U.V.L.O. Voltage V UVLO Supply Current I DD Stand-by Current I STB Oscillation Frequency FOSC PFM Switching Current I PFM Maximum I Limit MAXI ...

Page 7

... L =5.0V, V =0V =5.0V, V =Setting Voltage IN OUT(E) because those are only for the PFM control’s functions. PFM and V because those are only for the XC9237 series’ functions. PWML XC9235/XC9236/XC9237 MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 2.0 - 6.0 600 - - (*9) 1.00 1.40 1 ...

Page 8

... FOSC is 1.2MHz, (C-1) should be 1.7V, (C-1) becomes 2.0V for the minimum operating voltage 2.0V. OUT(E) ●Soft-Start Time, Setting Voltage(XC9235B/36B/37B Series only) SERIES FOSC 1200kHz 1200kHz XC9235B/XC9237B 1200kHz 1200kHz 1200kHz XC9236B 1200kHz 3000kHz XC9235B/ XC9236B/XC9237B 3000kHz ■TYPICAL APPLICATION CIRCUIT 8/28 Series 1.2MHz TYP. MAX. 180 240 170 220 160 200 1.2MHz 3 ...

Page 9

... The current limit of the XC9235/XC9236/XC9237 series can be set at 1050mA at typical. Besides, care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state of the PC Board, latch time may become longer and latch operation may not work ...

Page 10

... XC9235/XC9236/XC9237 ■OPERATIONAL DESCRIPTION (Continued) <Short-Circuit Protection> The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V the block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB point voltage decreases less than half of the reference voltage (Vref) and a current more than the I the driver transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor ...

Page 11

... High Speed Discharge> <C L XC9235B(C)/ XC9236B(C)/ XC9237B(C) series can quickly discharge the electric charge at the output capacitor (C a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor located between the L pin and the V X discharged so that it may avoid application malfunction ...

Page 12

... DESCRIPTION (Continued) <CE/MODE Pin Function> The operation of the XC9235/XC9236/XC9237 series will enter into the shut down mode when a low level signal is input to the CE/MODE pin. During the shutdown mode, the current consumption of the IC becomes 0μA (TYP.), with a state of high impedance at the Lx pin and V pin ...

Page 13

... Start> Soft start time is available in two options via product selection. The XC9235A/XC9236A/XC9237A/XC9235C/XC9236C/XC9237C series provide 1.0ms (TYP). The XC9225B/XC9236B/XC9237B series provide 0.25ms (TYP). Soft start time is defined as the time to reach 90% of the output setting voltage when the CE pin is turned on. ...

Page 14

... XC9235/XC9236/XC9237 ■NOTE ON USE 1. The XC9235/XC9236/XC9237 series is designed for use with ceramic output capacitors. If, however, the potential difference is too large between the input voltage and the output voltage, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance ...

Page 15

... FOSC=1.2MHz or when a coil less value of 1.5μH is used at FOSC=3.0MHz, peak coil current more easily reach the current limit ILMI. In this case, it may happen that the IC can not provide 600mA output current. <External Components> XC9235/XC9236/XC9237 Series ) Value OUT 0.8V< ...

Page 16

... XC9235/XC9236/XC9237 ■NOTE ON USE (Continued) ●Instructions of pattern layouts 1. In order to stabilize V voltage level, we recommend that a by-pass capacitor (C IN the V & V pins Please mount each external component as close to the IC as possible. 3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit impedance ...

Page 17

... Circuit No.4 > Wave Form Measure Point Rpulldown 1μF 200Ω Circuit ⑥ < Circuit No.6 > 1μF Circuit ⑧ < Circuit No.8 > Wave Form Measure Point Ilat 1uF Rpulldown 1Ω XC9235/XC9236/XC9237 Series VIN Lx CE/ VOUT MODE VSS VIN Lx CE/ V VOUT MODE VSS ON resistance = (VIN-VLx)/100mA ...

Page 18

... XC9235/XC9236/XC9237 ■TYPICAL PERFORMANCE CHARACTERISTICS (1) Efficiency vs. Output Current XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF PWM/PFM Automatic Sw itching Control 100 90 80 VIN= 4. 3.6V 50 2. Output Current:IOUT(mA) Output Current: IOUT (mA) (2) Output Voltage vs. Output Current XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF 2 ...

Page 19

... VIN=2. 100 -50 -25 Ambient Temperature ℃ ) Ambient Temperature: Ta (℃) (7) UVLO Voltage vs. Ambient Temperature 1.8 1.5 1.2 0.9 0.6 0.3 0.0 75 100 -50 -25 Ambient Temperature ℃ ) Ambient Temperature: Ta (℃) XC9235/XC9236/XC9237 XC9237A18D 100 XC9237A18D VIN=6.0V VIN=4. 100 XC9237A18D CE=VIN 100 Series 19/28 ...

Page 20

... XC9235/XC9236/XC9237 ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (8) CE "H" Voltage vs. Ambient Temperature XC9237A18D 1.0 0.9 0.8 0.7 VIN=5.0V 0.6 0.5 0.4 0.3 VIN=3.6V VIN=2.4V 0.2 0.1 0.0 -50 - Ambient Temperature ℃ ) Ambient Temperature: Ta (℃) (10) Soft Start Time vs. Ambient Temperature XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μ VIN=3. -50 - Ambient Temperature: Ta (℃) Ambient Temperature ℃ ...

Page 21

... VOUT:1.0V/div L=1.5μH(NR3015), CIN=4.7μF, CL=10μF 500 400 300 200 VIN=5.0V 100 IOUT=1.0mA 0 -50 - 100 VIN=6.0V VIN=4.0V VIN=2.0V 75 100 XC9235/XC9236/XC9237 XC9237B33D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF CE:0.0V⇒1.0V 100μs/div XC9237B33D 100 Ambient Temperature: Ta(℃) Series 21/28 ...

Page 22

... XC9235/XC9236/XC9237 ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response XC9237A18C L=4.7μH (NR4018), C =4.7μF (ceramic =3.6V (PWM/PFM Automatic Switching Control =1mA → 100mA OUT 1ch: I OUT 2ch V : 50mV/div OUT 50μs/div I =100mA → 1mA OUT 1ch: I OUT 2ch V : 50mV/div OUT 200μ ...

Page 23

... OUT 1ch: I OUT 2ch V : 50mV/div OUT 200μs/div =10μF (ceramic), Topr=25℃ =1mA → 300mA OUT 1ch: I OUT 2ch V : 50mV/div OUT I =300mA → 1mA OUT 1ch: I OUT 2ch V : 50mV/div OUT XC9235/XC9236/XC9237 Series 50μs/div 200μs/div 23/28 ...

Page 24

... XC9235/XC9236/XC9237 ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response (Continued) XC9237A18D L=1.5μH (NR3015), C =4.7μF (ceramic =3.6V (PWM/PFM Automatic Switching Control =1mA → 100mA OUT 1ch: I OUT 2ch V : 50mV/div OUT 50μs/div I =100mA → 1mA OUT 1ch: I OUT 2ch V : 50mV/div OUT 200μ ...

Page 25

... OUT 1ch: I OUT 2ch V : 50mV/div OUT 200μs/div =10μF (ceramic), Topr=25℃ =1mA → 300mA OUT 1ch: I OUT 2ch V : 50mV/div OUT I =300mA → 1mA OUT 1ch: I OUT 2ch V : 50mV/div OUT XC9235/XC9236/XC9237 Series 50μs/div 200μs/div 25/28 ...

Page 26

... XC9235/XC9236/XC9237 ■PACKAGING INFORMATION ●SOT-25 ●USP-6C Recommended Pattern Layout 26/28 Series ●USP-6C ●USP-6C Recommended Metal Mask Design ...

Page 27

... MARK VOLTAGE (V) X.00 0 X.10 1 X.20 2 X.30 3 X.40 4 X.50 5 X.60 6 X.70 7 X.80 8 X.90 9 ④⑤Represents production lot number Order of 01, …09, 10, 11, …99, 0A, …0Z, 1A, …9Z, A0, …Z9, AA, …ZZ. ( excepted) *No character inversion used. XC9235/XC9236/XC9237 MARK FOSC =3.0MHz OUTPUT MARK VOLTAGE (V) X.05 A X.15 B X.25 C X.35 D X.45 E X.55 F X. ...

Page 28

... XC9235/XC9236/XC9237 1. The products and product specifications contained herein are subject to change without notice to improve performance characteristics. Consult us, or our representatives before use, to confirm that the information in this catalog date assume no responsibility for any infringement of patents, patent rights, or other rights arising from the use of any information and circuitry in this catalog. ...

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