Hotchip chip HT8836J
Hotchip chip HT8836J

DC-DC Converter AMOLED PMIC HT8836J

HT8836J is designed to drive AMOLED (Active Matrix Organic Light Emitting Diode) displays, requiring both positive and negative power supply rails. This device integrates a boost converter for VPOS and a reverse buck-boost converter for VNEG, making it suitable for battery-operated applications such as wearables, smartphones, multimedia players, portable cameras, and digital camera AMOLED display panels. The digital control pin (CTRL) allows for programmable negative output voltage in digital steps. HT8836J uses a new technology that achieves excellent line transient performance.

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1. Specifications

VIN = 3.7V, CTRL = 3.7V, VPOS = +4.6V, VNEG = -2.2V, typical value at TA = 25°C (unless otherwise specified).

Symbol Parameters Condition Min. Typ. Max. Unit
General
VIN Power Supply Input Voltage 2.9 3.7 4.5 V
Temp Operating Temperature -40 25 85 ℃
ISD Shutdown Current CTRL=GND 1 µA
VUVLO Undervoltage Lockout Threshold VIN Falling 2.1 V
VIN Rising 2.3
Logic Signal (CTRL)
VH High Threshold VIN=2.9 to 4.5V 1.2 V
VL Low Threshold 0.4
RDOWN Pull-Down Resistance 300 kΩ
Boost Converter (VPOS)
RDS(on)1A Switch On-Resistance ISWP1=200mA 200 mΩ
RDS(on)1B Rectifier On-Resistance 350
fSW1 Switching Frequency IVPOS=200mA 1.5 MHz
ISW1 Switch Current Limit Inductor peak current 0.6 A
IO1MAX Maximum Output Current VIN=2.9V to 4.5V 200 mA
VSCP1 Short Circuit Threshold During Operation VPOS falling 85% of VPOS
RDCHG1 Discharge Resistance CTRL=GND, ISWP1=1mA 30 Ω
Inverting Converter (VNEG)
VNEG Output Voltage Default -2.2 V
Output Voltage Range -1.4 -4.4
Output Voltage Accuracy 25°C≤TA≤ 85℃ No load -50 50 mV
–30°C≤TA≤ 85℃ No load -60 60
Line Regulation IVNEG=200mA 0.01 %/V
Load Regulation 0.1 %/A
RDS(on)2A SWN MOSFET On-Resistance ISWN=200mA 200 mΩ
RDS(on)2B SWN Rectifier On-Resistance 300 mΩ
IO2MAX Maximum Output Current VIN=2.9V 200 mA

2. Product Features

  • Operating Input Voltage Range from: 2.9V to 4.5V.
  • Boost Converter (VPOS).
(1) 4.6V Output Voltage;
(2) 200mA Output Current;
(3) 0.5% Accuracy (25°C to 85°C).
  • Inverting Converter (VNEG).
(1) -1.4V to -4.4V Programmable Output Voltage: (-2.2V Default);
(2) 200 mA Output Current;
  • Efficiency > 90%.
  • Excellent Line and Load Regulation.
  • Short Circuit Protection.
  • Thermal shutdown.

3. Typical Application Circuit Diagram

Typical Application Circuit Diagram of Hotchip HT8836J

4. Pin Diagram and Functional Description

Hotchip chip HT8836J DFN12L

Pin Name Pin Number Functional Description
SWP 1 Boost Converter (VPOS) Switch Pin
PGND 2 Boost Converter (VPOS) Power Ground
VPOS 3 Boost Converter (VPOS) Output
NC 4 Reserved Pin, Not Connected
GND 5 Ground
NC 6 Reserved Pin, Not Connected
CTRL 7 Boost Converter (VPOS) and VNEG Enable/Program Pin
TEST 8 Reserved for Device Testing. Not Connected
VNEG 9 Inverting Converter Output
SWN 10 Inverting Converter Switch Pin
VIN 11 Supply Voltage for the device
VIN 12 Supply Voltage for the device
EPAD Connect this pad to GND and PGND.

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