HE4057A

HEERMICR · Battery Management · SOT-23-6

HE4057A from HEERMICR, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	CHRG	output	Open-drain charge-status output that is pulled low while the charger is charging (VCHRG at most 0.5 V at 5 mA sink) and is high-impedance in other states, flashing when no battery is connected.
2	GND	power_in	Ground reference pin for the charger, to be connected to system ground.
3	BAT	power_out	Battery positive connection that delivers the charge current and regulates the battery to the float voltage of 4.20 V (4.16 V to 4.25 V); reverse-battery protection is provided.
4	VCC	power_in	Input supply pin, rated 4.50 V to 7.0 V (5.0 V typical) with an absolute maximum of 9 V, and the charger enters shutdown when VCC falls below the 3.8 V UVLO threshold.
5	STDBY	output	Open-drain charge-complete output that is pulled low when the battery charge cycle ends (VSTDBY at most 0.5 V at 5 mA sink) and is high-impedance otherwise.
6	PROG	passive	Programmable charge-current pin where a resistor to GND sets the constant charge current (charge current = 1000 × 1.0 V / RPROG, e.g. 100 mA at 10 kΩ and 500 mA at 2 kΩ), with an absolute maximum of 7 V.

Key specifications

Parameter	Value
Manufacturer	HEERMICR
Package	SOT-23-6
Category	Power Management (PMIC)
Pins	6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
输入电源电压	VCC	4.5	5	7	V		3
输入电源电流充电模式	ICC		240	500	uA	RPROG=10K	3
输入电源电流待机模式（充电终止）	ICC		50	100	uA	待机模式（充电终止）	3
输入电源电流停机模式	ICC		25	50	uA	停机模式（RPROG 未连接）; VCC < VBAT, or VCC < VUVLO	3
输出浮充电压	VFLOAT	4.16	4.2	4.25	V	0°C≤TA≤85°C,IBAT=40mA	3
BAT 端充电电流恒流模式 RPROG=10K	IBAT	90	100	110	mA	恒流模式，RPROG =10K	3
BAT 端充电电流恒流模式 RPROG=2K	IBAT	450	500	550	mA	恒流模式，RPROG =2K	3
BAT 端待机模式电流	IBAT	0	-2	-5	uA	待机模式，VBAT =4.20V	3
BAT 端停机模式电流	IBAT		1	2	uA	停机模式	3
电池反接模式电流	IBAT			0.7	mA	电池反接模式，VBAT =-4.0V	3
睡眠模式电流	IBAT		0	1	uA	睡眠模式，VCC = 0 V	3
涓流充电电流	ITRIKL	40	50	60	mA	VBAT＜VTRIKL, RPROG=2K	3
涓流充电门限电压	VTRIKL	2.8	2.9	3	V	VBAT上升	3
涓流充电迟滞电压	VTRHYS	60	80	110	mV	VBAT下降	3
VCC 欠压锁定电压	VUVLO	3.6	3.8	4	V	VCC上升	3
VCC 欠压锁定迟滞电压	VUVHYS	150	200	250	mV	VCC下降	3
手动关断阈值电压（上升）	VMSD	1.1	1.2	1.3	V	VPROG上升	3
手动关断阈值电压（下降）	VMSD	0.9	1	1.1	V	VPROG下降	3
VCC-VBAT 锁闭电压（上升）	VASD	70	100	140	mV	VCC上升	3
VCC-VBAT 锁闭电压（下降）	VASD	5	30	50	mV	VCC下降	3
C/10 终止电流门限 RPROG=10K	ITERM		0.1	0.12	mA/ mA	RPROG=10K	3
C/10 终止电流门限 RPROG=2K	ITERM		0.1	0.12	mA/ mA	RPROG=2K	3
PROG 引脚电压	VPROG	0.9	1	1.1	V	恒流模式，RPROG=10K	3
CHRG 端输出低电平	VCHRG		0.35	0.5	V	ICHRG=5mA	3
STDBY 端输出低电平	VSTDBY		0.35	0.5	V	ISTDBY=5mA	3
再充电电池门限电压	VRECHG		100	150	mV	VFLOAT-VRECHG	3
再充电延时时间	tRECHG	0.8	1.8	4	ms	VBAT由高到低	3
充电终止延时时间	tTERM	0.6	1.4	3	ms	IBAT降至 ICHG/10 以下	3
输入电压	VIN	-0.3		9	V		2
PROG 端电压		-0.3		7	V		2
工作温度范围		-40		85	°C		2
工作结温				125	°C		2
焊接温度 (Soldering, 10sec)		-260		260	°C	10 sec	2
ESD (Machine Mode)		-200		200	V		2
ESD (Human Body Mode)		-2000		2000	V		2
VBAT 端电压	VBAT	-0.3		7	V		2
CHRG、STDBY 端电压		-0.3		7	V		2
储存温度范围	Tstg	-65		125	°C		2
热阻 θJC	θJC		135		°C/W		2
IPROG PROG 端上拉电流	IPROG		2		uA		3

CAD (KiCad official)

Symbol: HE4057A
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model files: he4057a-etched.step / he4057a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); he4057a.step / he4057a.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: HEERMICR datasheet (7 pp, sha256 b0d0ec02032b8453, retrieved 2026-10-18, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

# HE4057A

**HEERMICR** · Battery Management · SOT-23-6

HE4057A from HEERMICR, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CHRG | output | Open-drain charge-status output that is pulled low while the charger is charging (VCHRG at most 0.5 V at 5 mA sink) and is high-impedance in other states, flashing when no battery is connected. |
| 2 | GND | power_in | Ground reference pin for the charger, to be connected to system ground. |
| 3 | BAT | power_out | Battery positive connection that delivers the charge current and regulates the battery to the float voltage of 4.20 V (4.16 V to 4.25 V); reverse-battery protection is provided. |
| 4 | VCC | power_in | Input supply pin, rated 4.50 V to 7.0 V (5.0 V typical) with an absolute maximum of 9 V, and the charger enters shutdown when VCC falls below the 3.8 V UVLO threshold. |
| 5 | STDBY | output | Open-drain charge-complete output that is pulled low when the battery charge cycle ends (VSTDBY at most 0.5 V at 5 mA sink) and is high-impedance otherwise. |
| 6 | PROG | passive | Programmable charge-current pin where a resistor to GND sets the constant charge current (charge current = 1000 × 1.0 V / RPROG, e.g. 100 mA at 10 kΩ and 500 mA at 2 kΩ), with an absolute maximum of 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 输入电源电压 | VCC | 4.5 | 5 | 7 | V |  | 3 |
| 输入电源电流 充电模式 | ICC |  | 240 | 500 | uA | RPROG=10K | 3 |
| 输入电源电流 待机模式（充电终止） | ICC |  | 50 | 100 | uA | 待机模式（充电终止） | 3 |
| 输入电源电流 停机模式 | ICC |  | 25 | 50 | uA | 停机模式（RPROG 未连接）; VCC < VBAT, or VCC < VUVLO | 3 |
| 输出浮充电压 | VFLOAT | 4.16 | 4.2 | 4.25 | V | 0°C≤TA≤85°C,IBAT=40mA | 3 |
| BAT 端充电电流 恒流模式 RPROG=10K | IBAT | 90 | 100 | 110 | mA | 恒流模式，RPROG =10K | 3 |
| BAT 端充电电流 恒流模式 RPROG=2K | IBAT | 450 | 500 | 550 | mA | 恒流模式，RPROG =2K | 3 |
| BAT 端待机模式电流 | IBAT | 0 | -2 | -5 | uA | 待机模式，VBAT =4.20V | 3 |
| BAT 端停机模式电流 | IBAT |  | 1 | 2 | uA | 停机模式 | 3 |
| 电池反接模式电流 | IBAT |  |  | 0.7 | mA | 电池反接模式，VBAT =-4.0V | 3 |
| 睡眠模式电流 | IBAT |  | 0 | 1 | uA | 睡眠模式，VCC = 0 V | 3 |
| 涓流充电电流 | ITRIKL | 40 | 50 | 60 | mA | VBAT＜VTRIKL, RPROG=2K | 3 |
| 涓流充电门限电压 | VTRIKL | 2.8 | 2.9 | 3 | V | VBAT上升 | 3 |
| 涓流充电迟滞电压 | VTRHYS | 60 | 80 | 110 | mV | VBAT下降 | 3 |
| VCC 欠压锁定电压 | VUVLO | 3.6 | 3.8 | 4 | V | VCC上升 | 3 |
| VCC 欠压锁定迟滞电压 | VUVHYS | 150 | 200 | 250 | mV | VCC下降 | 3 |
| 手动关断阈值电压（上升） | VMSD | 1.1 | 1.2 | 1.3 | V | VPROG上升 | 3 |
| 手动关断阈值电压（下降） | VMSD | 0.9 | 1 | 1.1 | V | VPROG下降 | 3 |
| VCC-VBAT 锁闭电压（上升） | VASD | 70 | 100 | 140 | mV | VCC上升 | 3 |
| VCC-VBAT 锁闭电压（下降） | VASD | 5 | 30 | 50 | mV | VCC下降 | 3 |
| C/10 终止电流门限 RPROG=10K | ITERM |  | 0.1 | 0.12 | mA/ mA | RPROG=10K | 3 |
| C/10 终止电流门限 RPROG=2K | ITERM |  | 0.1 | 0.12 | mA/ mA | RPROG=2K | 3 |
| PROG 引脚电压 | VPROG | 0.9 | 1 | 1.1 | V | 恒流模式，RPROG=10K | 3 |
| CHRG 端输出低电平 | VCHRG |  | 0.35 | 0.5 | V | ICHRG=5mA | 3 |
| STDBY 端输出低电平 | VSTDBY |  | 0.35 | 0.5 | V | ISTDBY=5mA | 3 |
| 再充电电池门限电压 | VRECHG |  | 100 | 150 | mV | VFLOAT-VRECHG | 3 |
| 再充电延时时间 | tRECHG | 0.8 | 1.8 | 4 | ms | VBAT由高到低 | 3 |
| 充电终止延时时间 | tTERM | 0.6 | 1.4 | 3 | ms | IBAT降至 ICHG/10 以下 | 3 |
| 输入电压 | VIN | -0.3 |  | 9 | V |  | 2 |
| PROG 端电压 |  | -0.3 |  | 7 | V |  | 2 |
| 工作温度范围 |  | -40 |  | 85 | °C |  | 2 |
| 工作结温 |  |  |  | 125 | °C |  | 2 |
| 焊接温度 (Soldering, 10sec) |  | -260 |  | 260 | °C | 10 sec | 2 |
| ESD (Machine Mode) |  | -200 |  | 200 | V |  | 2 |
| ESD (Human Body Mode) |  | -2000 |  | 2000 | V |  | 2 |
| VBAT 端电压 | VBAT | -0.3 |  | 7 | V |  | 2 |
| CHRG、STDBY 端电压 |  | -0.3 |  | 7 | V |  | 2 |
| 储存温度范围 | Tstg | -65 |  | 125 | °C |  | 2 |
| 热阻 θJC | θJC |  | 135 |  | °C/W |  | 2 |
| IPROG PROG 端上拉电流 | IPROG |  | 2 |  | uA |  | 3 |

## CAD (KiCad official)

- Symbol: `HE4057A`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `he4057a-etched.step` / `he4057a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he4057a.step` / `he4057a.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [HEERMICR datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590239351549964288) (7 pp, sha256 `b0d0ec02032b8453`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/he4057a-datasheet.pdf)